Split cython for py3 and py2

commit_hash:be16297e622cad23f9548bedfb2710b51b967573
author: mikhnenko <[email protected]> 2026-01-13 09:51:48 +0300
committer: mikhnenko <[email protected]> 2026-01-13 10:20:05 +0300
commit: 05c0c8a128582bb1391c8e78f3e9269b9876e079 (patch)
tree: 43d19cde15d5035bf689baa0a468bfba418dc372
parent: 7d5b002a117264dd78b242cc37673ec656379d4c (diff)
95 files changed, 31840 insertions, 39 deletions
diff --git a/build/conf/python.conf b/build/conf/python.conf
index e760c0d1bcc..b5cf6170ce8 100644
--- a/build/conf/python.conf
+++ b/build/conf/python.conf
@@ -1,11 +1,10 @@
 # tag:python-specific tag:cython-specific
-CYTHON_SCRIPT=${input:"${ARCADIA_ROOT}/contrib/tools/cython/cython.py"} ${hide:CYTHON_FAKEID} $CYTHON_PREDEFINED_INCLUDES
-RUN_CYTHON_SCRIPT=$YMAKE_PYTHON3 $CYTHON_SCRIPT
-RUN_CYTHON_SCRIPT_H=$YMAKE_PYTHON3 $CYTHON_SCRIPT
+PY3_CYTHON_SCRIPT=${input:"${ARCADIA_ROOT}/contrib/tools/cython/cython.py"} ${hide:CYTHON_FAKEID} $PY3_CYTHON_PREDEFINED_INCLUDES
+PY2_CYTHON_SCRIPT=${input:"${ARCADIA_ROOT}/contrib/tools/cython_py2/cython.py"} ${hide:CYTHON_FAKEID} $PY2_CYTHON_PREDEFINED_INCLUDES
 PYTHON_TYPE_FOR_CYTHON=PY3
 _NEED_PYTHON_COVERAGE=no
 
-CYTHON_EMBEDED_FILES=\
+PY3_CYTHON_EMBEDED_FILES=\
 contrib/tools/cython/Cython/Utility/arrayarray.h \
 contrib/tools/cython/Cython/Utility/AsyncGen.c \
 contrib/tools/cython/Cython/Utility/Buffer.c \
@@ -41,6 +40,42 @@ contrib/tools/cython/Cython/Utility/TestCyUtilityLoader.pyx \
 contrib/tools/cython/Cython/Utility/TestUtilityLoader.c \
 contrib/tools/cython/Cython/Utility/UFuncs_C.c
 
+PY2_CYTHON_EMBEDED_FILES=\
+contrib/tools/cython_py2/Cython/Utility/arrayarray.h \
+contrib/tools/cython_py2/Cython/Utility/AsyncGen.c \
+contrib/tools/cython_py2/Cython/Utility/Buffer.c \
+contrib/tools/cython_py2/Cython/Utility/Builtins.c \
+contrib/tools/cython_py2/Cython/Utility/CConvert.pyx \
+contrib/tools/cython_py2/Cython/Utility/CMath.c \
+contrib/tools/cython_py2/Cython/Utility/CommonStructures.c \
+contrib/tools/cython_py2/Cython/Utility/CommonTypes.c \
+contrib/tools/cython_py2/Cython/Utility/Complex.c \
+contrib/tools/cython_py2/Cython/Utility/Coroutine.c \
+contrib/tools/cython_py2/Cython/Utility/CpdefEnums.pyx \
+contrib/tools/cython_py2/Cython/Utility/CppConvert.pyx \
+contrib/tools/cython_py2/Cython/Utility/CppSupport.cpp \
+contrib/tools/cython_py2/Cython/Utility/CythonFunction.c \
+contrib/tools/cython_py2/Cython/Utility/Dataclasses.c \
+contrib/tools/cython_py2/Cython/Utility/Embed.c \
+contrib/tools/cython_py2/Cython/Utility/Exceptions.c \
+contrib/tools/cython_py2/Cython/Utility/ExtensionTypes.c \
+contrib/tools/cython_py2/Cython/Utility/FunctionArguments.c \
+contrib/tools/cython_py2/Cython/Utility/ImportExport.c \
+contrib/tools/cython_py2/Cython/Utility/MemoryView.pyx \
+contrib/tools/cython_py2/Cython/Utility/MemoryView_C.c \
+contrib/tools/cython_py2/Cython/Utility/ModuleSetupCode.c \
+contrib/tools/cython_py2/Cython/Utility/NumpyImportArray.c \
+contrib/tools/cython_py2/Cython/Utility/ObjectHandling.c \
+contrib/tools/cython_py2/Cython/Utility/Optimize.c \
+contrib/tools/cython_py2/Cython/Utility/Overflow.c \
+contrib/tools/cython_py2/Cython/Utility/Printing.c \
+contrib/tools/cython_py2/Cython/Utility/Profile.c \
+contrib/tools/cython_py2/Cython/Utility/StringTools.c \
+contrib/tools/cython_py2/Cython/Utility/TestCythonScope.pyx \
+contrib/tools/cython_py2/Cython/Utility/TestCyUtilityLoader.pyx \
+contrib/tools/cython_py2/Cython/Utility/TestUtilityLoader.c \
+contrib/tools/cython_py2/Cython/Utility/UFuncs_C.c
+
 macro _UNWRAP_TEXT_INPUTS(Files...) {
     .CMD=${hide;input=TEXT:Files}
 }
@@ -50,24 +85,34 @@ macro _UNWRAP_OUTPUT_INCLUDES(Files...) {
 }
 
 
-CYTHON_OUTPUT_INCLUDES=\
-${hide;output_include:"contrib/libs/python/Include/compile.h"} \
-${hide;output_include:"contrib/libs/python/Include/frameobject.h"} \
-${hide;output_include:"contrib/libs/python/Include/longintrepr.h"} \
-${hide;output_include:"contrib/libs/python/Include/pyconfig.h"} \
-${hide;output_include:"contrib/libs/python/Include/Python.h"} \
-${hide;output_include:"contrib/libs/python/Include/pythread.h"} \
-${hide;output_include:"contrib/libs/python/Include/structmember.h"} \
-${hide;output_include:"contrib/libs/python/Include/traceback.h"} \
+PY_COMMON_CYTHON_OUTPUT_INCLUDES=\
+contrib/libs/python/Include/compile.h \
+contrib/libs/python/Include/frameobject.h \
+contrib/libs/python/Include/longintrepr.h \
+contrib/libs/python/Include/pyconfig.h \
+contrib/libs/python/Include/Python.h \
+contrib/libs/python/Include/pythread.h \
+contrib/libs/python/Include/structmember.h \
+contrib/libs/python/Include/traceback.h \
+omp.h
+
+PY3_CYTHON_OUTPUT_INCLUDES=\
 ${hide;output_include:"contrib/tools/cython/generated_c_headers.h"} \
-${hide;output_include:"omp.h"} \
-$_UNWRAP_OUTPUT_INCLUDES($CYTHON_EMBEDED_FILES)
+$_UNWRAP_OUTPUT_INCLUDES($PY_COMMON_CYTHON_OUTPUT_INCLUDES) \
+$_UNWRAP_OUTPUT_INCLUDES($PY3_CYTHON_EMBEDED_FILES)
+
+PY2_CYTHON_OUTPUT_INCLUDES=\
+${hide;output_include:"contrib/tools/cython_py2/generated_c_headers.h"} \
+$_UNWRAP_OUTPUT_INCLUDES($PY_COMMON_CYTHON_OUTPUT_INCLUDES) \
+$_UNWRAP_OUTPUT_INCLUDES($PY2_CYTHON_EMBEDED_FILES)
 
 # tag:cython-specific
-CYTHON_CPP_OUTPUT_INCLUDES=${hide;output_include:"contrib/tools/cython/generated_cpp_headers.h"}
+PY3_CYTHON_CPP_OUTPUT_INCLUDES=${hide;output_include:"contrib/tools/cython/generated_cpp_headers.h"}
+PY2_CYTHON_CPP_OUTPUT_INCLUDES=${hide;output_include:"contrib/tools/cython_py2/generated_cpp_headers.h"}
 
 # tag:cython-specific
-CYTHON_PREDEFINED_INCLUDES=$_UNWRAP_TEXT_INPUTS($CYTHON_EMBEDED_FILES)
+PY3_CYTHON_PREDEFINED_INCLUDES=$_UNWRAP_TEXT_INPUTS($PY3_CYTHON_EMBEDED_FILES)
+PY2_CYTHON_PREDEFINED_INCLUDES=$_UNWRAP_TEXT_INPUTS($PY2_CYTHON_EMBEDED_FILES)
 
 # tag:cython-specific
 CYTHON_PREDEFINED_INDUCED=\
diff --git a/build/plugins/pybuild.py b/build/plugins/pybuild.py
index acba3d5028d..a20f0b8e841 100644
--- a/build/plugins/pybuild.py
+++ b/build/plugins/pybuild.py
@@ -90,7 +90,7 @@ def mangle(name):
     return ''.join('{}{}'.format(len(s), s) for s in name.split('.'))
 
 
-def parse_pyx_includes(filename, path, source_root, seen=None):
+def parse_pyx_includes(filename, path, source_root, seen=None, py3=True):
     def normpath(*args):
         return os.path.normpath(os.path.join(*args))
 
@@ -119,15 +119,16 @@ def parse_pyx_includes(filename, path, source_root, seen=None):
             incname, incpath = normpath(file_dirname, incfile), normpath(path_dirname, incfile)
             yield (incname, incpath)
             # search for includes in the included files
-            for e in parse_pyx_includes(incname, incpath, source_root, seen):
+            for e in parse_pyx_includes(incname, incpath, source_root, seen, py3):
                 yield e
         else:
             # There might be arcadia root or cython relative include.
             # Don't treat such file as missing, because there must be PEERDIR on py_library
             # which contains it.
+            cython_dir = "/contrib/tools/cython/" if py3 else "/contrib/tools/cython_py2/"
             for path in [
                 source_root,
-                source_root + "/contrib/tools/cython/Cython/Includes",
+                source_root + cython_dir + "Cython/Includes",
             ]:
                 if os.path.exists(normpath(path, incfile)):
                     break
@@ -461,7 +462,7 @@ def onpy_srcs(unit, *args):
                 else:
                     cpp_files2res.add((filename + with_ext + out_suffix, path + with_ext + out_suffix))
                 # used includes
-                for entry in parse_pyx_includes(filename, path, unit.resolve('$S')):
+                for entry in parse_pyx_includes(filename, path, unit.resolve('$S'), py3):
                     py_files2res.add(entry)
                     include_arc_rel = entry[0]
                     include_map[filename].add(include_arc_rel)
@@ -524,13 +525,15 @@ def onpy_srcs(unit, *args):
                 unit.onresource_files(['DONT_COMPRESS'] + [x for name, path in files2res for x in ('DEST', name, path)])
 
         if include_map:
-            data = ['DONT_COMPRESS']
-            prefix = 'resfs/cython/include'
-            for line in sorted(
-                '{}/{}={}'.format(prefix, filename, ':'.join(sorted(files))) for filename, files in include_map.items()
-            ):
-                data += ['-', line]
-            unit.onresource(data)
+            for cyhon in ['cython', 'cython_py2']:
+                data = ['DONT_COMPRESS']
+                prefix = f'resfs/{cython}/include'
+                for line in sorted(
+                    '{}/{}={}'.format(prefix, filename, ':'.join(sorted(files)))
+                    for filename, files in include_map.items()
+                ):
+                    data += ['-', line]
+                unit.onresource(data)
 
     for swigs, on_swig_python in [
         (swigs_c, unit.on_swig_python_c),
diff --git a/build/sysincl/unsorted.yml b/build/sysincl/unsorted.yml
index b0dc2337266..0c966933f5e 100644
--- a/build/sysincl/unsorted.yml
+++ b/build/sysincl/unsorted.yml
@@ -286,6 +286,14 @@
   - sys/stream.h
   # end libpcap files
 
+# These includes are required by sandboxing
+
+- includes:
+  - numpy/__init__.pxd:
+    - contrib/python/numpy/py3/numpy/__init__.pxd
+    - contrib/tools/cython/Cython/Includes/numpy/__init__.pxd
+    - contrib/tools/cython_py2/Cython/Includes/numpy/__init__.pxd
+
 # These includes are not used in autocheck builds, but might be necessary for
 # some external builds with exotic settings
 
diff --git a/build/ymake.core.conf b/build/ymake.core.conf
index f8145cab5e5..83bc8a23ff8 100644
--- a/build/ymake.core.conf
+++ b/build/ymake.core.conf
@@ -14,7 +14,7 @@ GO_FAKEID=2025-11-05
 ANDROID_FAKEID=2023-05-17
 CLANG_TIDY_FAKEID=2023-06-06
 IWYU_FAKEID=2025-01-08
-CYTHON_FAKEID=2025-12-05
+CYTHON_FAKEID=2025-12-16
 JAVA_FAKEID=9377710
 PROTO_FAKEID=0
 FBS_FAKEID=2024-03-13
@@ -3271,8 +3271,15 @@ otherwise {
     # Numpy includes must come first because of both numpy and Cython/Includes contain numpy.pxd definitions
     # but Numpy's variant should be preferred
     # https://github.com/cython/cython/issues/6249#issuecomment-2176633822
-    _CYTHON_SYS_INCLUDES=\
-        FOR cython contrib/tools/cython/Cython/Includes \
+    when ($PYTHON3 == "yes") {
+        _CYTHON_SYS_INCLUDES=\
+            FOR cython contrib/tools/cython/Cython/Includes
+    }
+    otherwise {
+        _CYTHON_SYS_INCLUDES=\
+            FOR cython contrib/tools/cython_py2/Cython/Includes
+    }
+    _CYTHON_SYS_INCLUDES+=\
         contrib/python/numpy/include/numpy/core/include \
         contrib/python/numpy/include/numpy/core/include/numpy \
         contrib/python/numpy/include/numpy/core/src/common \
@@ -3280,11 +3287,26 @@ otherwise {
         contrib/python/numpy/include/numpy/distutils/include
 }
 
+when ($PYTHON3 == "yes") {
+    RUN_CYTHON_SCRIPT=$YMAKE_PYTHON3 $PY3_CYTHON_SCRIPT
+    RUN_CYTHON_SCRIPT_H=$YMAKE_PYTHON3 $PY3_CYTHON_SCRIPT
+    CYTHON_OUTPUT_INCLUDES=$PY3_CYTHON_OUTPUT_INCLUDES
+    CYTHON_CPP_OUTPUT_INCLUDES=$PY3_CYTHON_CPP_OUTPUT_INCLUDES
+    CYTHON_SUFFIX=
+}
+otherwise {
+    RUN_CYTHON_SCRIPT=$YMAKE_PYTHON3 $PY2_CYTHON_SCRIPT
+    RUN_CYTHON_SCRIPT_H=$YMAKE_PYTHON3 $PY2_CYTHON_SCRIPT
+    CYTHON_OUTPUT_INCLUDES=$PY2_CYTHON_OUTPUT_INCLUDES
+    CYTHON_CPP_OUTPUT_INCLUDES=$PY2_CYTHON_CPP_OUTPUT_INCLUDES
+    CYTHON_SUFFIX=.py2
+}
+
 
 # tag:src-processing
 macro _SRC("pyx", SRC, SRCFLAGS...) {
     # Copy-paste from BUILDWITH_CYTHON
-    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} ${pre=-I:_CYTHON__INCLUDE} ${input:SRC} -o ${tobindir;output;suf=${OBJ_SUF}.cpp:SRC} $CYTHON_OUTPUT_INCLUDES ${SRCFLAGS} ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
+    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} ${pre=-I:_CYTHON__INCLUDE} ${input:SRC} -o ${tobindir;output;suf=${OBJ_SUF}${CYTHON_SUFFIX}.cpp:SRC} $CYTHON_OUTPUT_INCLUDES ${SRCFLAGS} ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
     .SEM=target_options-privates-ITEM && target_options-privates-option target_cython_sources && target_options-privates-args ${input:Src} ${hide;tobindir;output;suf=.fake.o:Src} && target_macroses-ITEM && target_macroses-macro target_cython_options && target_macroses-args $CYTHON_OPTIONS --cplus ${SRCFLAGS} ${CYTHON_CPP_OUTPUT_INCLUDES} && target_macroses-ITEM && target_macroses-macro target_cython_include_directories && target_macroses-args $_CYTHON__INCLUDE && target_macroses-ITEM && target_macroses-macro set_python_type_for_cython && target_macroses-args $PYTHON_TYPE_FOR_CYTHON
     .ADDINCL=$_CYTHON_SYS_INCLUDES
 }
@@ -3931,7 +3953,7 @@ macro SRC_C_NO_LTO(FILE, FLAGS...) {
 ###
 ### Generates .cpp file from .pyx.
 macro BUILDWITH_CYTHON_CPP(Src, Options...) {
-    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS ${Options} --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} -o ${tobindir;output;suf=${OBJ_SUF}.cpp:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
+    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS ${Options} --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} -o ${tobindir;output;suf=${OBJ_SUF}${CYTHON_SUFFIX}.cpp:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
     .SEM=target_options-privates-ITEM && target_options-privates-option target_cython_sources && target_options-privates-args ${input:Src} ${hide;tobindir;output;suf=.fake.o:Src} && target_macroses-ITEM && target_macroses-macro target_cython_options && target_macroses-args $CYTHON_OPTIONS ${Options} --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} && target_macroses-ITEM && target_macroses-macro target_cython_include_directories && target_macroses-args $_CYTHON__INCLUDE && target_macroses-ITEM && target_macroses-macro set_python_type_for_cython && target_macroses-args $PYTHON_TYPE_FOR_CYTHON
     ADDINCL($_CYTHON_SYS_INCLUDES)
 }
@@ -3942,7 +3964,7 @@ macro BUILDWITH_CYTHON_CPP(Src, Options...) {
 ### Generates .cpp file from .pyx and attach extra input Dep.
 ### If Dep changes the .cpp file will be re-generated.
 macro _BUILDWITH_CYTHON_CPP_DEP(Src, Dep, Options...) {
-    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS ${Options} --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=${OBJ_SUF}.cpp:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
+    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS ${Options} --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=${OBJ_SUF}${CYTHON_SUFFIX}.cpp:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
     .SEM=target_options-privates-ITEM && target_options-privates-option target_cython_sources && target_options-privates-args ${input:Src} ${hide;input:Dep} ${hide;tobindir;output;suf=.fake.o:Src} && target_macroses-ITEM && target_macroses-macro target_cython_options && target_macroses-args $CYTHON_OPTIONS ${Options} --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} && target_macroses-ITEM && target_macroses-macro target_cython_include_directories && target_macroses-args $_CYTHON__INCLUDE && target_macroses-ITEM && target_macroses-macro set_python_type_for_cython && target_macroses-args $PYTHON_TYPE_FOR_CYTHON
     ADDINCL($_CYTHON_SYS_INCLUDES)
 }
@@ -3952,7 +3974,7 @@ macro _BUILDWITH_CYTHON_CPP_DEP(Src, Dep, Options...) {
 ###
 ### BUILDWITH_CYTHON_CPP without .pyx infix and with cdef public .h file.
 macro _BUILDWITH_CYTHON_CPP_H(Src, Dep, Options...) {
-    .CMD=$RUN_CYTHON_SCRIPT_H $CYTHON_OPTIONS ${Options} --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=.cpp;noext:Src} ${hide;addincl;tobindir;output;suf=.h;noext:Src} ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
+    .CMD=$RUN_CYTHON_SCRIPT_H $CYTHON_OPTIONS ${Options} --cplus ${CYTHON_CPP_OUTPUT_INCLUDES} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=${CYTHON_SUFFIX}.cpp;noext:Src} ${hide;addincl;tobindir;output;suf=${CYTHON_SUFFIX}.h;noext:Src} ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
     ADDINCL($_CYTHON_SYS_INCLUDES)
 }
 
@@ -3962,7 +3984,7 @@ macro _BUILDWITH_CYTHON_CPP_H(Src, Dep, Options...) {
 ###
 ### Generates .c file from .pyx.
 macro BUILDWITH_CYTHON_C(Src, Options...) {
-    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS ${Options} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} -o ${tobindir;output;suf=${OBJ_SUF}.c:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
+    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS ${Options} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} -o ${tobindir;output;suf=${OBJ_SUF}${CYTHON_SUFFIX}.c:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
     .SEM=target_options-privates-ITEM && target_options-privates-option target_cython_sources && target_options-privates-args ${input:Src} ${hide;tobindir;output;suf=.fake.o:Src} && target_macroses-ITEM && target_macroses-macro target_cython_options && target_macroses-args $CYTHON_OPTIONS ${Options} ${CYTHON_OUTPUT_INCLUDES} && target_macroses-ITEM && target_macroses-macro target_cython_include_directories && target_macroses-args $_CYTHON__INCLUDE && target_macroses-ITEM && target_macroses-macro set_python_type_for_cython && target_macroses-args $PYTHON_TYPE_FOR_CYTHON
     ADDINCL($_CYTHON_SYS_INCLUDES)
 }
@@ -3973,7 +3995,7 @@ macro BUILDWITH_CYTHON_C(Src, Options...) {
 ### Generates .c file from .pyx and attach extra input Dep.
 ### If Dep changes the .c file will be re-generated.
 macro _BUILDWITH_CYTHON_C_DEP(Src, Dep, Options...) {
-    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS ${Options} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=${OBJ_SUF}.c:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
+    .CMD=$RUN_CYTHON_SCRIPT $CYTHON_OPTIONS ${Options} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=${OBJ_SUF}${CYTHON_SUFFIX}.c:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
     .SEM=target_options-privates-ITEM && target_options-privates-option target_cython_sources && target_options-privates-args ${input:Src} ${hide;input:Dep} ${hide;tobindir;output;suf=.fake.o:Src} && target_macroses-ITEM && target_macroses-macro target_cython_options && target_macroses-args $CYTHON_OPTIONS ${Options} ${CYTHON_OUTPUT_INCLUDES} && target_macroses-ITEM && target_macroses-macro target_cython_include_directories && target_macroses-args $_CYTHON__INCLUDE && target_macroses-ITEM && target_macroses-macro set_python_type_for_cython && target_macroses-args $PYTHON_TYPE_FOR_CYTHON
     ADDINCL($_CYTHON_SYS_INCLUDES)
 }
@@ -3983,7 +4005,7 @@ macro _BUILDWITH_CYTHON_C_DEP(Src, Dep, Options...) {
 ###
 ### BUILDWITH_CYTHON_C without .pyx infix and with cdef public .h file.
 macro _BUILDWITH_CYTHON_C_H(Src, Dep, Options...) {
-    .CMD=$RUN_CYTHON_SCRIPT_H $CYTHON_OPTIONS ${Options} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=.c;noext:Src} ${hide;addincl;tobindir;output;suf=.h;noext:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
+    .CMD=$RUN_CYTHON_SCRIPT_H $CYTHON_OPTIONS ${Options} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=${CYTHON_SUFFIX}.c;noext:Src} ${hide;addincl;tobindir;output;suf=${CYTHON_SUFFIX}.h;noext:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
     ADDINCL($_CYTHON_SYS_INCLUDES)
 }
 
@@ -3992,7 +4014,7 @@ macro _BUILDWITH_CYTHON_C_H(Src, Dep, Options...) {
 ###
 ### BUILDWITH_CYTHON_C_H with cdef api _api.h file.
 macro _BUILDWITH_CYTHON_C_API_H(Src, Dep, Options...) {
-    .CMD=$RUN_CYTHON_SCRIPT_H $CYTHON_OPTIONS ${Options} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=.c;noext:Src} ${hide;addincl;tobindir;output;suf=.h;noext:Src} ${hide;addincl;tobindir;output;defext=_api.h;noext:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
+    .CMD=$RUN_CYTHON_SCRIPT_H $CYTHON_OPTIONS ${Options} ${pre=-I:_CYTHON__INCLUDE} ${input:Src} ${hide;input:Dep} -o ${tobindir;output;suf=${CYTHON_SUFFIX}.c;noext:Src} ${hide;addincl;tobindir;output;suf=${CYTHON_SUFFIX}.h;noext:Src} ${hide;addincl;tobindir;output;defext=${CYTHON_SUFFIX}_api.h;noext:Src} $CYTHON_OUTPUT_INCLUDES ${hide;kv:"p CY"} ${hide;kv:"pc yellow"}
     ADDINCL($_CYTHON_SYS_INCLUDES)
 }
 
diff --git a/contrib/python/numpy/include/ya.make b/contrib/python/numpy/include/ya.make
index 2c994eaa96b..78e03d10858 100644
--- a/contrib/python/numpy/include/ya.make
+++ b/contrib/python/numpy/include/ya.make
@@ -16,4 +16,10 @@ ADDINCL(
     GLOBAL FOR cython contrib/python/numpy/include/numpy/core/include/numpy
 )
 
+IF (PYTHON_TYPE_FOR_CYTHON == "PY3")
+    ADDINCL(
+        GLOBAL FOR cython contrib/python/numpy/py3
+    )
+ENDIF()
+
 END()
diff --git a/contrib/python/numpy/py3/ya.make b/contrib/python/numpy/py3/ya.make
index a6a43be5f15..1797792994c 100644
--- a/contrib/python/numpy/py3/ya.make
+++ b/contrib/python/numpy/py3/ya.make
@@ -25,6 +25,9 @@ ADDINCL(
     contrib/python/numpy/include/numpy/core/src/umath
     contrib/python/numpy/include/numpy/distutils/include
 )
+ADDINCL(
+    GLOBAL FOR cython contrib/python/numpy/py3
+)
 
 NO_COMPILER_WARNINGS()
 
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/__init__.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/__init__.pxd
new file mode 100644
index 00000000000..7ad2684aa79
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/__init__.pxd
@@ -0,0 +1,187 @@
+#####################################################################
+#
+# These are the Cython pxd files for (most of) the Python/C API.
+#
+# REFERENCE COUNTING:
+#
+#   JUST TO SCARE YOU:
+#   If you are going to use any of the Python/C API in your Cython
+#   program, you might be responsible for doing reference counting.
+#   Read http://docs.python.org/api/refcounts.html which is so
+#   important I've copied it below.
+#
+# For all the declaration below, whenever the Py_ function returns
+# a *new reference* to a PyObject*, the return type is "object".
+# When the function returns a borrowed reference, the return
+# type is PyObject*.  When Cython sees "object" as a return type
+# it doesn't increment the reference count.  When it sees PyObject*
+# in order to use the result you must explicitly cast to <object>,
+# and when you do that Cython increments the reference count whether
+# you want it to or not, forcing you to an explicit DECREF (or leak memory).
+# To avoid this we make the above convention.  Note, you can
+# always locally override this convention by putting something like
+#
+#     cdef extern from "Python.h":
+#         PyObject* PyNumber_Add(PyObject *o1, PyObject *o2)
+#
+# in your .pyx file or into a cimported .pxd file.  You just have to
+# use the one from the right (pxd-)namespace then.
+#
+# Cython automatically takes care of reference counting for anything
+# of type object.
+#
+## More precisely, I think the correct convention for
+## using the Python/C API from Cython is as follows.
+##
+## (1) Declare all input arguments as type "object".  This way no explicit
+##    <PyObject*> casting is needed, and moreover Cython doesn't generate
+##    any funny reference counting.
+## (2) Declare output as object if a new reference is returned.
+## (3) Declare output as PyObject* if a borrowed reference is returned.
+##
+## This way when you call objects, no cast is needed, and if the api
+## calls returns a new reference (which is about 95% of them), then
+## you can just assign to a variable of type object.  With borrowed
+## references if you do an explicit typecast to <object>, Cython generates an
+## INCREF and DECREF so you have to be careful.  However, you got a
+## borrowed reference in this case, so there's got to be another reference
+## to your object, so you're OK, as long as you relealize this
+## and use the result of an explicit cast to <object> as a borrowed
+## reference (and you can call Py_INCREF if you want to turn it
+## into another reference for some reason).
+#
+# "The reference count is important because today's computers have
+# a finite (and often severely limited) memory size; it counts how
+# many different places there are that have a reference to an
+# object. Such a place could be another object, or a global (or
+# static) C variable, or a local variable in some C function. When
+# an object's reference count becomes zero, the object is
+# deallocated. If it contains references to other objects, their
+# reference count is decremented. Those other objects may be
+# deallocated in turn, if this decrement makes their reference
+# count become zero, and so on. (There's an obvious problem with
+# objects that reference each other here; for now, the solution is
+# ``don't do that.'')
+#
+# Reference counts are always manipulated explicitly. The normal
+# way is to use the macro Py_INCREF() to increment an object's
+# reference count by one, and Py_DECREF() to decrement it by
+# one. The Py_DECREF() macro is considerably more complex than the
+# incref one, since it must check whether the reference count
+# becomes zero and then cause the object's deallocator to be
+# called. The deallocator is a function pointer contained in the
+# object's type structure. The type-specific deallocator takes
+# care of decrementing the reference counts for other objects
+# contained in the object if this is a compound object type, such
+# as a list, as well as performing any additional finalization
+# that's needed. There's no chance that the reference count can
+# overflow; at least as many bits are used to hold the reference
+# count as there are distinct memory locations in virtual memory
+# (assuming sizeof(long) >= sizeof(char*)). Thus, the reference
+# count increment is a simple operation.
+#
+# It is not necessary to increment an object's reference count for
+# every local variable that contains a pointer to an object. In
+# theory, the object's reference count goes up by one when the
+# variable is made to point to it and it goes down by one when the
+# variable goes out of scope. However, these two cancel each other
+# out, so at the end the reference count hasn't changed. The only
+# real reason to use the reference count is to prevent the object
+# from being deallocated as long as our variable is pointing to
+# it. If we know that there is at least one other reference to the
+# object that lives at least as long as our variable, there is no
+# need to increment the reference count temporarily. An important
+# situation where this arises is in objects that are passed as
+# arguments to C functions in an extension module that are called
+# from Python; the call mechanism guarantees to hold a reference
+# to every argument for the duration of the call.
+#
+# However, a common pitfall is to extract an object from a list
+# and hold on to it for a while without incrementing its reference
+# count. Some other operation might conceivably remove the object
+# from the list, decrementing its reference count and possible
+# deallocating it. The real danger is that innocent-looking
+# operations may invoke arbitrary Python code which could do this;
+# there is a code path which allows control to flow back to the
+# user from a Py_DECREF(), so almost any operation is potentially
+# dangerous.
+#
+# A safe approach is to always use the generic operations
+# (functions whose name begins with "PyObject_", "PyNumber_",
+# "PySequence_" or "PyMapping_"). These operations always
+# increment the reference count of the object they return. This
+# leaves the caller with the responsibility to call Py_DECREF()
+# when they are done with the result; this soon becomes second
+# nature.
+#
+# Now you should read http://docs.python.org/api/refcountDetails.html
+# just to be sure you understand what is going on.
+#
+#################################################################
+
+
+
+#################################################################
+# BIG FAT DEPRECATION WARNING
+#################################################################
+# Do NOT cimport any names directly from the cpython package,
+# despite of the star-imports below.  They will be removed at
+# some point.
+# Instead, use the correct sub-module to draw your cimports from.
+#
+# A direct cimport from the package will make your code depend on
+# all of the existing declarations. This may have side-effects
+# and reduces the portability of your code.
+#################################################################
+# START OF DEPRECATED SECTION
+#################################################################
+
+from cpython.version cimport *
+from cpython.ref cimport *
+from cpython.exc cimport *
+from cpython.module cimport *
+from cpython.mem cimport *
+from cpython.tuple cimport *
+from cpython.list cimport *
+from cpython.object cimport *
+from cpython.sequence cimport *
+from cpython.mapping cimport *
+from cpython.iterator cimport *
+from cpython.type cimport *
+from cpython.number cimport *
+from cpython.int cimport *
+from cpython.bool cimport *
+from cpython.long cimport *
+from cpython.float cimport *
+from cpython.complex cimport *
+from cpython.string cimport *
+from cpython.unicode cimport *
+from cpython.dict cimport *
+from cpython.instance cimport *
+from cpython.function cimport *
+from cpython.method cimport *
+from cpython.weakref cimport *
+from cpython.getargs cimport *
+from cpython.pythread cimport *
+from cpython.pystate cimport *
+
+# Python <= 2.x
+from cpython.cobject cimport *
+from cpython.oldbuffer cimport *
+
+# Python >= 2.4
+from cpython.set cimport *
+
+# Python >= 2.6
+from cpython.buffer cimport *
+from cpython.bytes cimport *
+
+# Python >= 3.0
+from cpython.pycapsule cimport *
+
+# Python >= 3.7
+from cpython.contextvars cimport *
+
+#################################################################
+# END OF DEPRECATED SECTION
+#################################################################
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/bool.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/bool.pxd
new file mode 100644
index 00000000000..3359214523b
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/bool.pxd
@@ -0,0 +1,37 @@
+
+cdef extern from "Python.h":
+
+    ############################################################################
+    # 7.2.2 Boolean Objects
+    ############################################################################
+
+    ctypedef class __builtin__.bool [object PyBoolObject]:
+        pass
+
+    # Booleans in Python are implemented as a subclass of
+    # integers. There are only two booleans, Py_False and Py_True. As
+    # such, the normal creation and deletion functions don't apply to
+    # booleans. The following macros are available, however.
+
+    bint PyBool_Check(object o)
+    # Return true if o is of type PyBool_Type.
+
+    #PyObject* Py_False
+    # The Python False object. This object has no methods. It needs to
+    # be treated just like any other object with respect to reference
+    # counts.
+
+    #PyObject* Py_True
+    # The Python True object. This object has no methods. It needs to
+    # be treated just like any other object with respect to reference
+    # counts.
+
+    # Py_RETURN_FALSE
+    # Return Py_False from a function, properly incrementing its reference count.
+
+    # Py_RETURN_TRUE
+    # Return Py_True from a function, properly incrementing its reference count.
+
+    object PyBool_FromLong(long v)
+    # Return value: New reference.
+    # Return a new reference to Py_True or Py_False depending on the truth value of v.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/buffer.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/buffer.pxd
new file mode 100644
index 00000000000..3f1ada774aa
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/buffer.pxd
@@ -0,0 +1,112 @@
+# Please see the Python header files (object.h/abstract.h) for docs
+
+cdef extern from "Python.h":
+
+    cdef enum:
+        PyBUF_MAX_NDIM
+
+    cdef enum:
+        PyBUF_SIMPLE,
+        PyBUF_WRITABLE,
+        PyBUF_WRITEABLE, # backwards compatibility
+        PyBUF_FORMAT,
+        PyBUF_ND,
+        PyBUF_STRIDES,
+        PyBUF_C_CONTIGUOUS,
+        PyBUF_F_CONTIGUOUS,
+        PyBUF_ANY_CONTIGUOUS,
+        PyBUF_INDIRECT,
+        PyBUF_CONTIG,
+        PyBUF_CONTIG_RO,
+        PyBUF_STRIDED,
+        PyBUF_STRIDED_RO,
+        PyBUF_RECORDS,
+        PyBUF_RECORDS_RO,
+        PyBUF_FULL,
+        PyBUF_FULL_RO,
+        PyBUF_READ,
+        PyBUF_WRITE,
+        PyBUF_SHADOW
+
+    bint PyObject_CheckBuffer(object obj)
+    # Return 1 if obj supports the buffer interface otherwise 0.
+
+    int PyObject_GetBuffer(object obj, Py_buffer *view, int flags) except -1
+    # Export obj into a Py_buffer, view. These arguments must never be
+    # NULL. The flags argument is a bit field indicating what kind of
+    # buffer the caller is prepared to deal with and therefore what
+    # kind of buffer the exporter is allowed to return. The buffer
+    # interface allows for complicated memory sharing possibilities,
+    # but some caller may not be able to handle all the complexity but
+    # may want to see if the exporter will let them take a simpler
+    # view to its memory.
+
+    # Some exporters may not be able to share memory in every possible
+    # way and may need to raise errors to signal to some consumers
+    # that something is just not possible. These errors should be a
+    # BufferError unless there is another error that is actually
+    # causing the problem. The exporter can use flags information to
+    # simplify how much of the Py_buffer structure is filled in with
+    # non-default values and/or raise an error if the object can’t
+    # support a simpler view of its memory.
+
+    # 0 is returned on success and -1 on error.
+
+    void PyBuffer_Release(Py_buffer *view)
+    # Release the buffer view. This should be called when the buffer
+    # is no longer being used as it may free memory from it.
+
+    void* PyBuffer_GetPointer(Py_buffer *view, Py_ssize_t *indices)
+    # ??
+
+    Py_ssize_t PyBuffer_SizeFromFormat(char *) # actually const char
+    # Return the implied ~Py_buffer.itemsize from the struct-stype
+    # ~Py_buffer.format
+
+    int PyBuffer_ToContiguous(void *buf, Py_buffer *view, Py_ssize_t len, char fort)
+    # ??
+
+    int PyBuffer_FromContiguous(Py_buffer *view, void *buf, Py_ssize_t len, char fort)
+    # ??
+
+    int PyObject_CopyToObject(object obj, void *buf, Py_ssize_t len, char fortran) except -1
+    # Copy len bytes of data pointed to by the contiguous chunk of
+    # memory pointed to by buf into the buffer exported by obj. The
+    # buffer must of course be writable. Return 0 on success and
+    # return -1 and raise an error on failure. If the object does not
+    # have a writable buffer, then an error is raised. If fortran is
+    # 'F', then if the object is multi-dimensional, then the data will
+    # be copied into the array in Fortran-style (first dimension
+    # varies the fastest). If fortran is 'C', then the data will be
+    # copied into the array in C-style (last dimension varies the
+    # fastest). If fortran is 'A', then it does not matter and the
+    # copy will be made in whatever way is more efficient.
+
+    int PyObject_CopyData(object dest, object src) except -1
+    # Copy the data from the src buffer to the buffer of destination
+
+    bint PyBuffer_IsContiguous(Py_buffer *view, char fort)
+    # Return 1 if the memory defined by the view is C-style (fortran
+    # is 'C') or Fortran-style (fortran is 'F') contiguous or either
+    # one (fortran is 'A'). Return 0 otherwise.
+
+    void PyBuffer_FillContiguousStrides(int ndims,
+                                        Py_ssize_t *shape,
+                                        Py_ssize_t *strides,
+                                        Py_ssize_t itemsize,
+                                        char fort)
+    # Fill the strides array with byte-strides of a contiguous
+    # (Fortran-style if fort is 'F' or C-style otherwise) array of the
+    # given shape with the given number of bytes per element.
+
+    int PyBuffer_FillInfo(Py_buffer *view, object exporter, void *buf,
+                          Py_ssize_t len, int readonly, int flags) except -1
+    # Fill in a buffer-info structure, view, correctly for an exporter
+    # that can only share a contiguous chunk of memory of “unsigned
+    # bytes” of the given length. Return 0 on success and -1 (with
+    # raising an error) on error.
+
+    # DEPRECATED HERE: do not cimport from here, cimport from cpython.object instead
+    object PyObject_Format(object obj, object format_spec)
+    # Takes an arbitrary object and returns the result of calling
+    # obj.__format__(format_spec).
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/bytearray.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/bytearray.pxd
new file mode 100644
index 00000000000..1af4a6c427b
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/bytearray.pxd
@@ -0,0 +1,33 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+    bint PyByteArray_Check(object o)
+    # Return true if the object o is a bytearray object or an instance of a subtype of the bytearray type.
+
+    bint PyByteArray_CheckExact(object o)
+    # Return true if the object o is a bytearray object, but not an instance of a subtype of the bytearray type.
+
+    bytearray PyByteArray_FromObject(object o)
+    # Return a new bytearray object from any object, o, that implements the buffer protocol.
+
+    bytearray PyByteArray_FromStringAndSize(char *string, Py_ssize_t len)
+    # Create a new bytearray object from string and its length, len. On failure, NULL is returned.
+
+    bytearray PyByteArray_Concat(object a, object b)
+    # Concat bytearrays a and b and return a new bytearray with the result.
+
+    Py_ssize_t PyByteArray_Size(object bytearray)
+    # Return the size of bytearray after checking for a NULL pointer.
+
+    char* PyByteArray_AsString(object bytearray)
+    # Return the contents of bytearray as a char array after checking for a NULL pointer.
+    # The returned array always has an extra null byte appended.
+
+    int PyByteArray_Resize(object bytearray, Py_ssize_t len)
+    # Resize the internal buffer of bytearray to len.
+
+    char* PyByteArray_AS_STRING(object bytearray)
+    # Macro version of PyByteArray_AsString().
+
+    Py_ssize_t PyByteArray_GET_SIZE(object bytearray)
+    # Macro version of PyByteArray_Size().
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/bytes.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/bytes.pxd
new file mode 100644
index 00000000000..8998770d8df
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/bytes.pxd
@@ -0,0 +1,200 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+    ctypedef struct va_list
+
+    ############################################################################
+    # 7.3.1 String Objects
+    ############################################################################
+
+    # These functions raise TypeError when expecting a string
+    # parameter and are called with a non-string parameter.
+    # PyStringObject
+    # This subtype of PyObject represents a Python bytes object.
+    # PyTypeObject PyBytes_Type
+    # This instance of PyTypeObject represents the Python bytes type;
+    # it is the same object as bytes and types.BytesType in the Python
+    # layer.
+
+    bint PyBytes_Check(object o)
+    # Return true if the object o is a string object or an instance of
+    # a subtype of the string type.
+
+    bint PyBytes_CheckExact(object o)
+    # Return true if the object o is a string object, but not an instance of a subtype of the string type.
+
+    bytes PyBytes_FromString(char *v)
+    # Return value: New reference.
+    # Return a new string object with the value v on success, and NULL
+    # on failure. The parameter v must not be NULL; it will not be
+    # checked.
+
+    bytes PyBytes_FromStringAndSize(char *v, Py_ssize_t len)
+    # Return value: New reference.
+    # Return a new string object with the value v and length len on
+    # success, and NULL on failure. If v is NULL, the contents of the
+    # string are uninitialized.
+
+    bytes PyBytes_FromFormat(char *format, ...)
+    # Return value: New reference.
+    # Take a C printf()-style format string and a variable number of
+    # arguments, calculate the size of the resulting Python string and
+    # return a string with the values formatted into it. The variable
+    # arguments must be C types and must correspond exactly to the
+    # format characters in the format string. The following format
+    # characters are allowed:
+    # Format Characters 	Type 	Comment
+    # %% 	n/a 	The literal % character.
+    # %c 	int 	A single character, represented as an C int.
+    # %d 	int 	Exactly equivalent to printf("%d").
+    # %u 	unsigned int 	Exactly equivalent to printf("%u").
+    # %ld 	long 	Exactly equivalent to printf("%ld").
+    # %lu 	unsigned long 	Exactly equivalent to printf("%lu").
+    # %zd 	Py_ssize_t 	Exactly equivalent to printf("%zd").
+    # %zu 	size_t 	Exactly equivalent to printf("%zu").
+    # %i 	int 	Exactly equivalent to printf("%i").
+    # %x 	int 	Exactly equivalent to printf("%x").
+    # %s 	char* 	A null-terminated C character array.
+
+    # %p 	void* 	The hex representation of a C pointer.
+    #    Mostly equivalent to printf("%p") except that it is guaranteed to
+    #    start with the literal 0x regardless of what the platform's printf
+    #    yields.
+    # An unrecognized format character causes all the rest of the
+    # format string to be copied as-is to the result string, and any
+    # extra arguments discarded.
+
+    bytes PyBytes_FromFormatV(char *format, va_list vargs)
+    # Return value: New reference.
+    # Identical to PyBytes_FromFormat() except that it takes exactly two arguments.
+
+    bytes PyBytes_FromObject(object o)
+    # Return value: New reference.
+    # Return the bytes representation of object o that implements the buffer protocol.
+
+    Py_ssize_t PyBytes_Size(object string) except -1
+    # Return the length of the string in string object string.
+
+    Py_ssize_t PyBytes_GET_SIZE(object string)
+    # Macro form of PyBytes_Size() but without error checking.
+
+    char* PyBytes_AsString(object string) except NULL
+    # Return a NUL-terminated representation of the contents of
+    # string. The pointer refers to the internal buffer of string, not
+    # a copy. The data must not be modified in any way, unless the
+    # string was just created using PyBytes_FromStringAndSize(NULL,
+    # size). It must not be deallocated. If string is a Unicode
+    # object, this function computes the default encoding of string
+    # and operates on that. If string is not a string object at all,
+    # PyBytes_AsString() returns NULL and raises TypeError.
+
+    char* PyBytes_AS_STRING(object string)
+    # Macro form of PyBytes_AsString() but without error
+    # checking. Only string objects are supported; no Unicode objects
+    # should be passed.
+
+    int PyBytes_AsStringAndSize(object obj, char **buffer, Py_ssize_t *length) except -1
+    # Return a NULL-terminated representation of the contents of the
+    # object obj through the output variables buffer and length.
+    #
+    # The function accepts both string and Unicode objects as
+    # input. For Unicode objects it returns the default encoded
+    # version of the object. If length is NULL, the resulting buffer
+    # may not contain NUL characters; if it does, the function returns
+    # -1 and a TypeError is raised.
+
+    # The buffer refers to an internal string buffer of obj, not a
+    # copy. The data must not be modified in any way, unless the
+    # string was just created using PyBytes_FromStringAndSize(NULL,
+    # size). It must not be deallocated. If string is a Unicode
+    # object, this function computes the default encoding of string
+    # and operates on that. If string is not a string object at all,
+    # PyBytes_AsStringAndSize() returns -1 and raises TypeError.
+
+    void PyBytes_Concat(PyObject **string, object newpart)
+    # Create a new string object in *string containing the contents of
+    # newpart appended to string; the caller will own the new
+    # reference. The reference to the old value of string will be
+    # stolen. If the new string cannot be created, the old reference
+    # to string will still be discarded and the value of *string will
+    # be set to NULL; the appropriate exception will be set.
+
+    void PyBytes_ConcatAndDel(PyObject **string, object newpart)
+    # Create a new string object in *string containing the contents of
+    # newpart appended to string. This version decrements the
+    # reference count of newpart.
+
+    int _PyBytes_Resize(PyObject **string, Py_ssize_t newsize) except -1
+    # A way to resize a string object even though it is
+    # ``immutable''. Only use this to build up a brand new string
+    # object; don't use this if the string may already be known in
+    # other parts of the code. It is an error to call this function if
+    # the refcount on the input string object is not one. Pass the
+    # address of an existing string object as an lvalue (it may be
+    # written into), and the new size desired. On success, *string
+    # holds the resized string object and 0 is returned; the address
+    # in *string may differ from its input value. If the reallocation
+    # fails, the original string object at *string is deallocated,
+    # *string is set to NULL, a memory exception is set, and -1 is
+    # returned.
+
+    bytes PyBytes_Format(object format, object args)
+    # Return value: New reference.  Return a new string object from
+    # format and args. Analogous to format % args. The args argument
+    # must be a tuple.
+
+    void PyBytes_InternInPlace(PyObject **string)
+    # Intern the argument *string in place. The argument must be the
+    # address of a pointer variable pointing to a Python string
+    # object. If there is an existing interned string that is the same
+    # as *string, it sets *string to it (decrementing the reference
+    # count of the old string object and incrementing the reference
+    # count of the interned string object), otherwise it leaves
+    # *string alone and interns it (incrementing its reference
+    # count). (Clarification: even though there is a lot of talk about
+    # reference counts, think of this function as
+    # reference-count-neutral; you own the object after the call if
+    # and only if you owned it before the call.)
+
+    bytes PyBytes_InternFromString(char *v)
+    # Return value: New reference.
+    # A combination of PyBytes_FromString() and
+    # PyBytes_InternInPlace(), returning either a new string object
+    # that has been interned, or a new (``owned'') reference to an
+    # earlier interned string object with the same value.
+
+    object PyBytes_Decode(char *s, Py_ssize_t size, char *encoding, char *errors)
+    #  Return value: New reference.
+    # Create an object by decoding size bytes of the encoded buffer s
+    # using the codec registered for encoding. encoding and errors
+    # have the same meaning as the parameters of the same name in the
+    # unicode() built-in function. The codec to be used is looked up
+    # using the Python codec registry. Return NULL if an exception was
+    # raised by the codec.
+
+    object PyBytes_AsDecodedObject(object str, char *encoding, char *errors)
+    # Return value: New reference.
+    # Decode a string object by passing it to the codec registered for
+    # encoding and return the result as Python object. encoding and
+    # errors have the same meaning as the parameters of the same name
+    # in the string encode() method. The codec to be used is looked up
+    # using the Python codec registry. Return NULL if an exception was
+    # raised by the codec.
+
+    object PyBytes_Encode(char *s, Py_ssize_t size, char *encoding, char *errors)
+    # Return value: New reference.
+    # Encode the char buffer of the given size by passing it to the
+    # codec registered for encoding and return a Python
+    # object. encoding and errors have the same meaning as the
+    # parameters of the same name in the string encode() method. The
+    # codec to be used is looked up using the Python codec
+    # registry. Return NULL if an exception was raised by the codec.
+
+    object PyBytes_AsEncodedObject(object str, char *encoding, char *errors)
+    # Return value: New reference.
+    # Encode a string object using the codec registered for encoding
+    # and return the result as Python object. encoding and errors have
+    # the same meaning as the parameters of the same name in the
+    # string encode() method. The codec to be used is looked up using
+    # the Python codec registry. Return NULL if an exception was
+    # raised by the codec.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/cobject.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/cobject.pxd
new file mode 100644
index 00000000000..497d8a92e80
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/cobject.pxd
@@ -0,0 +1,36 @@
+
+cdef extern from "Python.h":
+
+    ###########################################################################
+    # Warning:
+    #
+    # The CObject API is deprecated as of Python 3.1. Please switch to
+    # the new Capsules API.
+    ###########################################################################
+
+    int PyCObject_Check(object p)
+    #     Return true if its argument is a PyCObject.
+
+    object PyCObject_FromVoidPtr(void* cobj, void (*destr)(void *))
+    #     Return value: New reference.
+    #
+    #     Create a PyCObject from the void * cobj. The destr function will
+    #     be called when the object is reclaimed, unless it is NULL.
+
+    object PyCObject_FromVoidPtrAndDesc(void* cobj, void* desc, void (*destr)(void *, void *))
+    #     Return value: New reference.
+    #
+    #     Create a PyCObject from the void * cobj. The destr function will
+    #     be called when the object is reclaimed. The desc argument can be
+    #     used to pass extra callback data for the destructor function.
+
+    void* PyCObject_AsVoidPtr(object self) except? NULL
+    #     Return the object void * that the PyCObject self was created with.
+
+    void* PyCObject_GetDesc(object self) except? NULL
+    #     Return the description void * that the PyCObject self was created with.
+
+    int PyCObject_SetVoidPtr(object self, void* cobj) except 0
+    #     Set the void pointer inside self to cobj. The PyCObject must not
+    #     have an associated destructor. Return true on success, false on
+    #     failure.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/complex.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/complex.pxd
new file mode 100644
index 00000000000..c0147547ce3
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/complex.pxd
@@ -0,0 +1,55 @@
+
+cdef extern from "Python.h":
+
+    ctypedef struct Py_complex:
+        double imag
+        double real
+
+    ############################################################################
+    # 7.2.5.2 Complex Numbers as Python Objects
+    ############################################################################
+
+    # PyComplexObject
+    # This subtype of PyObject represents a Python complex number object.
+
+    ctypedef class __builtin__.complex [object PyComplexObject]:
+        cdef Py_complex cval
+
+        @property
+        cdef inline double real(self) noexcept:
+            return self.cval.real
+
+        @property
+        cdef inline double imag(self) noexcept:
+            return self.cval.imag
+
+    # PyTypeObject PyComplex_Type
+    # This instance of PyTypeObject represents the Python complex
+    # number type. It is the same object as complex and
+    # types.ComplexType.
+
+    bint PyComplex_Check(object p)
+    # Return true if its argument is a PyComplexObject or a subtype of
+    # PyComplexObject.
+
+    bint PyComplex_CheckExact(object p)
+    # Return true if its argument is a PyComplexObject, but not a subtype of PyComplexObject.
+
+    object PyComplex_FromCComplex(Py_complex v)
+    # Return value: New reference.
+    # Create a new Python complex number object from a C Py_complex value.
+
+    object PyComplex_FromDoubles(double real, double imag)
+    # Return value: New reference.
+    # Return a new PyComplexObject object from real and imag.
+
+    double PyComplex_RealAsDouble(object op) except? -1
+    # Return the real part of op as a C double.
+
+    double PyComplex_ImagAsDouble(object op) except? -1
+    # Return the imaginary part of op as a C double.
+
+    Py_complex PyComplex_AsCComplex(object op)
+    # Return the Py_complex value of the complex number op.
+    #
+    # Returns (-1+0i) in case of an error
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/contextvars.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/contextvars.pxd
new file mode 100644
index 00000000000..aa80026642f
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/contextvars.pxd
@@ -0,0 +1,140 @@
+from cpython.object cimport PyObject
+from cpython.ref cimport Py_XDECREF
+
+cdef extern from "Python.h":
+    # Defining PyContextVar_Get() below to always return the default value for Py<3.7 and PyPy<7.3.6
+    # to make the inline functions sort-of work.
+    """
+    #if (PY_VERSION_HEX < 0x030700b1 || (CYTHON_COMPILING_IN_PYPY && PYPY_VERSION_NUM < 0x07030600)) && !defined(PyContextVar_Get)
+    #define PyContextVar_Get(var, d, v) \
+        ((d) ? \
+            ((void)(var), Py_INCREF(d), (v)[0] = (d), 0) : \
+            ((v)[0] = NULL, 0) \
+        )
+    #endif
+    """
+
+    ############################################################################
+    # Context Variables Objects
+    ############################################################################
+
+    # PyContext
+    # The C structure used to represent a `contextvars.Context` object.
+
+    # PyContextVar
+    # The C structure used to represent a `contextvars.ContextVar` object.
+
+    # PyContextToken
+    # The C structure used to represent a `contextvars.Token` object.
+
+    # PyTypeObject PyContext_Type
+    # Type object representing the `contextvars.Context` type.
+
+    # PyTypeObject PyContextVar_Type
+    # Type object representing the `contextvars.ContextVar` type.
+
+    # PyTypeObject PyContextToken_Type
+    # Type object representing the `contextvars.Token` type.
+
+    bint PyContext_CheckExact(object obj)
+    # Return `true` if `obj` is of type `PyContext_Type`.
+    # `obj` must not be NULL. This function always succeeds.
+
+    bint PyContextVar_CheckExact(object obj)
+    # Return `true` if `obj` is of type `PyContextVar_Type`.
+    # `obj` must not be NULL. This function always succeeds.
+
+    bint PyContextToken_CheckExact(object obj)
+    # Return `true` if `obj` is of type `PyContextToken_Type`.
+    # `obj` must not be NULL. This function always succeeds.
+
+    object PyContext_New()
+    # Return value: New reference.
+    # Create a new empty context object.
+    # Returns NULL if an error has occurred.
+
+    object PyContext_Copy(object ctx)
+    # Return value: New reference.
+    # Create a shallow copy of the passed `ctx` context object.
+    # Returns NULL if an error has occurred.
+
+    object PyContext_CopyCurrent()
+    # Return value: New reference.
+    # Create a shallow copy of the current thread context.
+    # Returns NULL if an error has occurred.
+
+    int PyContext_Enter(object ctx) except -1
+    # Set `ctx` as the current context for the current thread.
+    # Returns 0 on success, and -1 on error.
+
+    int PyContext_Exit(object ctx) except -1
+    # Deactivate the `ctx` context and restore the previous context
+    # as the current context for the current thread.
+    # Returns 0 on success, and -1 on error.
+
+    object PyContextVar_New(const char* name, PyObject* default_value)
+    # Return value: New reference.
+    # Create a new ContextVar object. The `name` parameter is used
+    # for introspection and debug purposes. The `default_value` parameter
+    # may optionally specify the default value for the context variable.
+    # If an error has occurred, this function returns NULL.
+
+    object PyContextVar_New_with_default "PyContextVar_New" (const char* name, object default_value)
+    # A different declaration of PyContextVar_New that requires a default value
+    # to be passed on call.
+
+    int PyContextVar_Get(object var, PyObject* default_value, PyObject** value) except -1
+    # Get the value of a context variable.
+    # Returns -1 if an error has occurred during lookup, and 0 if no error
+    # occurred, whether or not a value was found.
+    #
+    # If the context variable was found, `value` will be a pointer to it.
+    # If the context variable was not found, `value` will point to:
+    #
+    #   • `default_value`, if not NULL;
+    #   • the default value of `var`, if not NULL;
+    #   • NULL
+    int PyContextVar_Get_with_default "PyContextVar_Get" (object var, object default_value, PyObject** value) except -1
+    # A different declaration of PyContextVar_Get that requires a default value
+    # to be passed on call.
+
+    object PyContextVar_Set(object var, object value)
+    # Return value: New reference.
+    # Set the value of `var` to `value` in the current context.
+    # Returns a token object for this value change, or NULL if an error has occurred.
+
+    int PyContextVar_Reset(object var, object token) except -1
+    # Reset the state of the `var` context variable to that it was in
+    # before `PyContextVar_Set()` that returned `token` was called.
+    # This function returns 0 on success and -1 on error.
+
+
+cdef inline object get_value(var, default_value=None):
+    """Return a new reference to the value of the context variable,
+    or the default value of the context variable,
+    or None if no such value or default was found.
+    """
+    cdef PyObject *value = NULL
+    PyContextVar_Get(var, NULL, &value)
+    if value is NULL:
+        # context variable does not have a default
+        pyvalue = default_value
+    else:
+        # value or default value of context variable
+        pyvalue = <object>value
+        Py_XDECREF(value)  # PyContextVar_Get() returned an owned reference as 'PyObject*'
+    return pyvalue
+
+
+cdef inline object get_value_no_default(var, default_value=None):
+    """Return a new reference to the value of the context variable,
+    or the provided default value if no such value was found.
+
+    Ignores the default value of the context variable, if any.
+    """
+    cdef PyObject *value = NULL
+    PyContextVar_Get(var, <PyObject*>default_value, &value)
+    # value of context variable or 'default_value'
+    pyvalue = <object>value
+    Py_XDECREF(value)  # PyContextVar_Get() returned an owned reference as 'PyObject*'
+    return pyvalue
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/dict.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/dict.pxd
new file mode 100644
index 00000000000..979dd392a07
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/dict.pxd
@@ -0,0 +1,186 @@
+from .object cimport PyObject
+from .pyport cimport uint64_t
+
+cdef extern from "Python.h":
+    # On Python 2, PyDict_GetItemWithError is called _PyDict_GetItemWithError
+    """
+    #if PY_MAJOR_VERSION <= 2
+    #define PyDict_GetItemWithError _PyDict_GetItemWithError
+    #endif
+    """
+
+    ############################################################################
+    # 7.4.1 Dictionary Objects
+    ############################################################################
+
+    # PyDictObject
+    #
+    # This subtype of PyObject represents a Python dictionary object
+    # (i.e. the 'dict' type).
+
+    # PyTypeObject PyDict_Type
+    #
+    # This instance of PyTypeObject represents the Python dictionary
+    # type. This is exposed to Python programs as dict and
+    # types.DictType.
+
+    bint PyDict_Check(object p)
+    # Return true if p is a dict object or an instance of a subtype of
+    # the dict type.
+
+    bint PyDict_CheckExact(object p)
+    # Return true if p is a dict object, but not an instance of a
+    # subtype of the dict type.
+
+    dict PyDict_New()
+    # Return value: New reference.
+    # Return a new empty dictionary, or NULL on failure.
+
+    object PyDictProxy_New(object dict)
+    # Return value: New reference.
+    # Return a proxy object for a mapping which enforces read-only
+    # behavior. This is normally used to create a proxy to prevent
+    # modification of the dictionary for non-dynamic class types.
+
+    void PyDict_Clear(object p)
+    # Empty an existing dictionary of all key-value pairs.
+
+    int PyDict_Contains(object p, object key) except -1
+    # Determine if dictionary p contains key. If an item in p is
+    # matches key, return 1, otherwise return 0. On error, return
+    # -1. This is equivalent to the Python expression "key in p".
+
+    dict PyDict_Copy(object p)
+    # Return value: New reference.
+    # Return a new dictionary that contains the same key-value pairs as p.
+
+    int PyDict_SetItem(object p, object key, object val) except -1
+    # Insert value into the dictionary p with a key of key. key must
+    # be hashable; if it isn't, TypeError will be raised. Return 0 on
+    # success or -1 on failure.
+
+    int PyDict_SetItemString(object p, const char *key, object val) except -1
+    # Insert value into the dictionary p using key as a key. key
+    # should be a char*. The key object is created using
+    # PyString_FromString(key). Return 0 on success or -1 on failure.
+
+    int PyDict_DelItem(object p, object key) except -1
+    # Remove the entry in dictionary p with key key. key must be
+    # hashable; if it isn't, TypeError is raised. Return 0 on success
+    # or -1 on failure.
+
+    int PyDict_DelItemString(object p, const char *key) except -1
+    # Remove the entry in dictionary p which has a key specified by
+    # the string key. Return 0 on success or -1 on failure.
+
+    PyObject* PyDict_GetItem(object p, object key)
+    # Return value: Borrowed reference.
+    # Return the object from dictionary p which has a key key. Return
+    # NULL if the key key is not present, but without setting an
+    # exception.
+
+    PyObject* PyDict_GetItemWithError(object p, object key) except? NULL
+    # Return value: Borrowed reference.
+    # Variant of PyDict_GetItem() that does not suppress exceptions. Return
+    # NULL with an exception set if an exception occurred. Return NULL
+    # without an exception set if the key wasn’t present.
+
+    PyObject* PyDict_GetItemString(object p, const char *key)
+    # Return value: Borrowed reference.
+    # This is the same as PyDict_GetItem(), but key is specified as a
+    # char*, rather than a PyObject*.
+
+    PyObject* PyDict_SetDefault(object p, object key, object default) except NULL
+    # Return value: Borrowed reference.
+    # This is the same as the Python-level dict.setdefault(). If present, it
+    # returns the value corresponding to key from the dictionary p. If the key
+    # is not in the dict, it is inserted with value defaultobj and defaultobj
+    # is returned. This function evaluates the hash function of key only once,
+    # instead of evaluating it independently for the lookup and the insertion.
+
+    list PyDict_Items(object p)
+    # Return value: New reference.
+    # Return a PyListObject containing all the items from the
+    # dictionary, as in the dictionary method items() (see the Python
+    # Library Reference).
+
+    list PyDict_Keys(object p)
+    # Return value: New reference.
+    # Return a PyListObject containing all the keys from the
+    # dictionary, as in the dictionary method keys() (see the Python
+    # Library Reference).
+
+    list PyDict_Values(object p)
+    # Return value: New reference.
+    # Return a PyListObject containing all the values from the
+    # dictionary p, as in the dictionary method values() (see the
+    # Python Library Reference).
+
+    Py_ssize_t PyDict_Size(object p) except -1
+    # Return the number of items in the dictionary. This is equivalent
+    # to "len(p)" on a dictionary.
+
+    int PyDict_Next(object p, Py_ssize_t *ppos, PyObject* *pkey, PyObject* *pvalue)
+    # Iterate over all key-value pairs in the dictionary p. The int
+    # referred to by ppos must be initialized to 0 prior to the first
+    # call to this function to start the iteration; the function
+    # returns true for each pair in the dictionary, and false once all
+    # pairs have been reported. The parameters pkey and pvalue should
+    # either point to PyObject* variables that will be filled in with
+    # each key and value, respectively, or may be NULL. Any references
+    # returned through them are borrowed. ppos should not be altered
+    # during iteration. Its value represents offsets within the
+    # internal dictionary structure, and since the structure is
+    # sparse, the offsets are not consecutive.
+    # For example:
+    #
+    #object key, *value;
+    #int pos = 0;
+    #
+    #while (PyDict_Next(self->dict, &pos, &key, &value)) {
+    #   /* do something interesting with the values... */
+    #    ...
+    #}
+    # The dictionary p should not be mutated during iteration. It is
+    # safe (since Python 2.1) to modify the values of the keys as you
+    # iterate over the dictionary, but only so long as the set of keys
+    # does not change. For example:
+    # object key, *value;
+    # int pos = 0;
+    # while (PyDict_Next(self->dict, &pos, &key, &value)) {
+    #    int i = PyInt_AS_LONG(value) + 1;
+    #    object o = PyInt_FromLong(i);
+    #    if (o == NULL)
+    #        return -1;
+    #    if (PyDict_SetItem(self->dict, key, o) < 0) {
+    #        Py_DECREF(o);
+    #        return -1;
+    #    }
+    #    Py_DECREF(o);
+    # }
+
+    int PyDict_Merge(object a, object b, int override) except -1
+    # Iterate over mapping object b adding key-value pairs to
+    # dictionary a. b may be a dictionary, or any object supporting
+    # PyMapping_Keys() and PyObject_GetItem(). If override is true,
+    # existing pairs in a will be replaced if a matching key is found
+    # in b, otherwise pairs will only be added if there is not a
+    # matching key in a. Return 0 on success or -1 if an exception was
+    # raised.
+
+    int PyDict_Update(object a, object b) except -1
+    # This is the same as PyDict_Merge(a, b, 1) in C, or a.update(b)
+    # in Python. Return 0 on success or -1 if an exception was raised.
+
+    int PyDict_MergeFromSeq2(object a, object seq2, int override) except -1
+    # Update or merge into dictionary a, from the key-value pairs in
+    # seq2. seq2 must be an iterable object producing iterable objects
+    # of length 2, viewed as key-value pairs. In case of duplicate
+    # keys, the last wins if override is true, else the first
+    # wins. Return 0 on success or -1 if an exception was
+    # raised. Equivalent Python (except for the return value):
+    #
+    #def PyDict_MergeFromSeq2(a, seq2, override):
+    #    for key, value in seq2:
+    #        if override or key not in a:
+    #            a[key] = value
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/exc.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/exc.pxd
new file mode 100644
index 00000000000..756342ad3af
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/exc.pxd
@@ -0,0 +1,263 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+
+    #####################################################################
+    # 3. Exception Handling
+    #####################################################################
+
+    # The functions described in this chapter will let you handle and
+    # raise Python exceptions. It is important to understand some of
+    # the basics of Python exception handling. It works somewhat like
+    # the Unix errno variable: there is a global indicator (per
+    # thread) of the last error that occurred. Most functions don't
+    # clear this on success, but will set it to indicate the cause of
+    # the error on failure. Most functions also return an error
+    # indicator, usually NULL if they are supposed to return a
+    # pointer, or -1 if they return an integer (exception: the
+    # PyArg_*() functions return 1 for success and 0 for failure).
+
+    # When a function must fail because some function it called
+    # failed, it generally doesn't set the error indicator; the
+    # function it called already set it. It is responsible for either
+    # handling the error and clearing the exception or returning after
+    # cleaning up any resources it holds (such as object references or
+    # memory allocations); it should not continue normally if it is
+    # not prepared to handle the error. If returning due to an error,
+    # it is important to indicate to the caller that an error has been
+    # set. If the error is not handled or carefully propagated,
+    # additional calls into the Python/C API may not behave as
+    # intended and may fail in mysterious ways.
+
+    # The error indicator consists of three Python objects
+    # corresponding to the Python variables sys.exc_type,
+    # sys.exc_value and sys.exc_traceback. API functions exist to
+    # interact with the error indicator in various ways. There is a
+    # separate error indicator for each thread.
+
+    void PyErr_Print()
+    # Print a standard traceback to sys.stderr and clear the error
+    # indicator. Call this function only when the error indicator is
+    # set. (Otherwise it will cause a fatal error!)
+
+    PyObject* PyErr_Occurred()
+    # Return value: Borrowed reference.
+    # Test whether the error indicator is set. If set, return the
+    # exception type (the first argument to the last call to one of
+    # the PyErr_Set*() functions or to PyErr_Restore()). If not set,
+    # return NULL. You do not own a reference to the return value, so
+    # you do not need to Py_DECREF() it. Note: Do not compare the
+    # return value to a specific exception; use
+    # PyErr_ExceptionMatches() instead, shown below. (The comparison
+    # could easily fail since the exception may be an instance instead
+    # of a class, in the case of a class exception, or it may be a
+    # subclass of the expected exception.)
+
+    bint PyErr_ExceptionMatches(object exc)
+    # Equivalent to "PyErr_GivenExceptionMatches(PyErr_Occurred(),
+    # exc)". This should only be called when an exception is actually
+    # set; a memory access violation will occur if no exception has
+    # been raised.
+
+    bint PyErr_GivenExceptionMatches(object given, object exc)
+    # Return true if the given exception matches the exception in
+    # exc. If exc is a class object, this also returns true when given
+    # is an instance of a subclass. If exc is a tuple, all exceptions
+    # in the tuple (and recursively in subtuples) are searched for a
+    # match. If given is NULL, a memory access violation will occur.
+
+    void PyErr_NormalizeException(PyObject** exc, PyObject** val, PyObject** tb)
+    # Under certain circumstances, the values returned by
+    # PyErr_Fetch() below can be ``unnormalized'', meaning that *exc
+    # is a class object but *val is not an instance of the same
+    # class. This function can be used to instantiate the class in
+    # that case. If the values are already normalized, nothing
+    # happens. The delayed normalization is implemented to improve
+    # performance.
+
+    void PyErr_Clear()
+    # Clear the error indicator. If the error indicator is not set, there is no effect.
+
+    void PyErr_Fetch(PyObject** ptype, PyObject** pvalue, PyObject** ptraceback)
+    # Retrieve the error indicator into three variables whose
+    # addresses are passed. If the error indicator is not set, set all
+    # three variables to NULL. If it is set, it will be cleared and
+    # you own a reference to each object retrieved. The value and
+    # traceback object may be NULL even when the type object is
+    # not. Note: This function is normally only used by code that
+    # needs to handle exceptions or by code that needs to save and
+    # restore the error indicator temporarily.
+
+    PyObject* PyErr_GetHandledException()
+    void PyErr_SetHandledException(PyObject* exc)
+    PyObject* PyErr_GetRaisedException()
+    void PyErr_SetRaisedException(PyObject* exc)
+
+    void PyErr_Restore(PyObject* type, PyObject* value, PyObject* traceback)
+    # Set the error indicator from the three objects. If the error
+    # indicator is already set, it is cleared first. If the objects
+    # are NULL, the error indicator is cleared. Do not pass a NULL
+    # type and non-NULL value or traceback. The exception type should
+    # be a class. Do not pass an invalid exception type or
+    # value. (Violating these rules will cause subtle problems later.)
+    # This call takes away a reference to each object: you must own a
+    # reference to each object before the call and after the call you
+    # no longer own these references. (If you don't understand this,
+    # don't use this function. I warned you.) Note: This function is
+    # normally only used by code that needs to save and restore the
+    # error indicator temporarily; use PyErr_Fetch() to save the
+    # current exception state.
+
+    void PyErr_SetString(object type, char *message)
+    # This is the most common way to set the error indicator. The
+    # first argument specifies the exception type; it is normally one
+    # of the standard exceptions, e.g. PyExc_RuntimeError. You need
+    # not increment its reference count. The second argument is an
+    # error message; it is converted to a string object.
+
+    void PyErr_SetObject(object type, object value)
+    # This function is similar to PyErr_SetString() but lets you
+    # specify an arbitrary Python object for the ``value'' of the
+    # exception.
+
+    PyObject* PyErr_Format(object exception, char *format, ...) except NULL
+    # Return value: Always NULL.
+    # This function sets the error indicator and returns
+    # NULL. exception should be a Python exception (class, not an
+    # instance). format should be a string, containing format codes,
+    # similar to printf(). The width.precision before a format code is
+    # parsed, but the width part is ignored.
+
+    void PyErr_SetNone(object type)
+    # This is a shorthand for "PyErr_SetObject(type, Py_None)".
+
+    int PyErr_BadArgument() except 0
+
+    # This is a shorthand for "PyErr_SetString(PyExc_TypeError,
+    # message)", where message indicates that a built-in operation was
+    # invoked with an illegal argument. It is mostly for internal use.
+
+    PyObject* PyErr_NoMemory() except NULL
+    # Return value: Always NULL.
+    # This is a shorthand for "PyErr_SetNone(PyExc_MemoryError)"; it
+    # returns NULL so an object allocation function can write "return
+    # PyErr_NoMemory();" when it runs out of memory.
+
+    PyObject* PyErr_SetFromErrno(object type) except NULL
+    # Return value: Always NULL.
+    # This is a convenience function to raise an exception when a C
+    # library function has returned an error and set the C variable
+    # errno. It constructs a tuple object whose first item is the
+    # integer errno value and whose second item is the corresponding
+    # error message (gotten from strerror()), and then calls
+    # "PyErr_SetObject(type, object)". On Unix, when the errno value
+    # is EINTR, indicating an interrupted system call, this calls
+    # PyErr_CheckSignals(), and if that set the error indicator,
+    # leaves it set to that. The function always returns NULL, so a
+    # wrapper function around a system call can write "return
+    # PyErr_SetFromErrno(type);" when the system call returns an
+    # error.
+
+    PyObject* PyErr_SetFromErrnoWithFilenameObject(object type, object filenameObject) except NULL
+    # Similar to PyErr_SetFromErrno(), with the additional behavior
+    # that if filenameObject is not NULL, it is passed to the
+    # constructor of type as a third parameter.
+    # In the case of OSError exception, this is used to define
+    # the filename attribute of the exception instance.
+
+    PyObject* PyErr_SetFromErrnoWithFilename(object type, char *filename) except NULL
+    # Return value: Always NULL.  Similar to PyErr_SetFromErrno(),
+    # with the additional behavior that if filename is not NULL, it is
+    # passed to the constructor of type as a third parameter. In the
+    # case of exceptions such as IOError and OSError, this is used to
+    # define the filename attribute of the exception instance.
+
+    PyObject* PyErr_SetFromWindowsErr(int ierr) except NULL
+    # Return value: Always NULL.  This is a convenience function to
+    # raise WindowsError. If called with ierr of 0, the error code
+    # returned by a call to GetLastError() is used instead. It calls
+    # the Win32 function FormatMessage() to retrieve the Windows
+    # description of error code given by ierr or GetLastError(), then
+    # it constructs a tuple object whose first item is the ierr value
+    # and whose second item is the corresponding error message (gotten
+    # from FormatMessage()), and then calls
+    # "PyErr_SetObject(PyExc_WindowsError, object)". This function
+    # always returns NULL. Availability: Windows.
+
+    PyObject* PyErr_SetExcFromWindowsErr(object type, int ierr) except NULL
+    # Return value: Always NULL.  Similar to
+    # PyErr_SetFromWindowsErr(), with an additional parameter
+    # specifying the exception type to be raised. Availability:
+    # Windows. New in version 2.3.
+
+    PyObject* PyErr_SetFromWindowsErrWithFilename(int ierr, char *filename) except NULL
+    # Return value: Always NULL.  Similar to
+    # PyErr_SetFromWindowsErr(), with the additional behavior that if
+    # filename is not NULL, it is passed to the constructor of
+    # WindowsError as a third parameter. Availability: Windows.
+
+    PyObject* PyErr_SetExcFromWindowsErrWithFilename(object type, int ierr, char *filename) except NULL
+    # Return value: Always NULL.
+    # Similar to PyErr_SetFromWindowsErrWithFilename(), with an
+    # additional parameter specifying the exception type to be
+    # raised. Availability: Windows.
+
+    void PyErr_BadInternalCall()
+    # This is a shorthand for "PyErr_SetString(PyExc_TypeError,
+    # message)", where message indicates that an internal operation
+    # (e.g. a Python/C API function) was invoked with an illegal
+    # argument. It is mostly for internal use.
+
+    int PyErr_WarnEx(object category, char *message, int stacklevel) except -1
+    # Issue a warning message. The category argument is a warning
+    # category (see below) or NULL; the message argument is a message
+    # string. stacklevel is a positive number giving a number of stack
+    # frames; the warning will be issued from the currently executing
+    # line of code in that stack frame. A stacklevel of 1 is the
+    # function calling PyErr_WarnEx(), 2 is the function above that,
+    # and so forth.
+
+    int PyErr_WarnExplicit(object category, char *message, char *filename, int lineno, char *module, object registry) except -1
+    # Issue a warning message with explicit control over all warning
+    # attributes. This is a straightforward wrapper around the Python
+    # function warnings.warn_explicit(), see there for more
+    # information. The module and registry arguments may be set to
+    # NULL to get the default effect described there.
+
+    int PyErr_CheckSignals() except -1
+    # This function interacts with Python's signal handling. It checks
+    # whether a signal has been sent to the processes and if so,
+    # invokes the corresponding signal handler. If the signal module
+    # is supported, this can invoke a signal handler written in
+    # Python. In all cases, the default effect for SIGINT is to raise
+    # the KeyboardInterrupt exception. If an exception is raised the
+    # error indicator is set and the function returns 1; otherwise the
+    # function returns 0. The error indicator may or may not be
+    # cleared if it was previously set.
+
+    void PyErr_SetInterrupt() nogil
+    # This function simulates the effect of a SIGINT signal arriving
+    # -- the next time PyErr_CheckSignals() is called,
+    # KeyboardInterrupt will be raised. It may be called without
+    # holding the interpreter lock.
+
+    int PyErr_SetInterruptEx(int signum)
+
+    object PyErr_NewException(char *name, object base, object dict)
+    # Return value: New reference.
+    # This utility function creates and returns a new exception
+    # object. The name argument must be the name of the new exception,
+    # a C string of the form module.class. The base and dict arguments
+    # are normally NULL. This creates a class object derived from
+    # Exception (accessible in C as PyExc_Exception).
+
+    void PyErr_WriteUnraisable(object obj)
+    # This utility function prints a warning message to sys.stderr
+    # when an exception has been set but it is impossible for the
+    # interpreter to actually raise the exception. It is used, for
+    # example, when an exception occurs in an __del__() method.
+    #
+    # The function is called with a single argument obj that
+    # identifies the context in which the unraisable exception
+    # occurred. The repr of obj will be printed in the warning
+    # message.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/float.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/float.pxd
new file mode 100644
index 00000000000..7c567a80fcc
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/float.pxd
@@ -0,0 +1,46 @@
+cdef extern from "Python.h":
+    """
+    #if PY_MAJOR_VERSION >= 3
+      #define __Pyx_PyFloat_FromString(obj)  PyFloat_FromString(obj)
+    #else
+      #define __Pyx_PyFloat_FromString(obj)  PyFloat_FromString(obj, NULL)
+    #endif
+    """
+
+    ############################################################################
+    # 7.2.3
+    ############################################################################
+    # PyFloatObject
+    #
+    # This subtype of PyObject represents a Python floating point object.
+
+    # PyTypeObject PyFloat_Type
+    #
+    # This instance of PyTypeObject represents the Python floating
+    # point type. This is the same object as float and
+    # types.FloatType.
+
+    bint PyFloat_Check(object p)
+    # Return true if its argument is a PyFloatObject or a subtype of
+    # PyFloatObject.
+
+    bint PyFloat_CheckExact(object p)
+    # Return true if its argument is a PyFloatObject, but not a
+    # subtype of PyFloatObject.
+
+    object PyFloat_FromString "__Pyx_PyFloat_FromString" (object str)
+    # Return value: New reference.
+    # Create a PyFloatObject object based on the string value in str,
+    # or NULL on failure. The pend argument is ignored. It remains
+    # only for backward compatibility.
+
+    object PyFloat_FromDouble(double v)
+    # Return value: New reference.
+    # Create a PyFloatObject object from v, or NULL on failure.
+
+    double PyFloat_AsDouble(object pyfloat) except? -1
+    # Return a C double representation of the contents of pyfloat.
+
+    double PyFloat_AS_DOUBLE(object pyfloat)
+    # Return a C double representation of the contents of pyfloat, but
+    # without error checking.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/function.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/function.pxd
new file mode 100644
index 00000000000..0002a3f6cbc
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/function.pxd
@@ -0,0 +1,65 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+
+    ############################################################################
+    # 7.5.3 Function Objects
+    ############################################################################
+    # There are a few functions specific to Python functions.
+
+    # PyFunctionObject
+    #
+    # The C structure used for functions.
+
+    # PyTypeObject PyFunction_Type
+    #
+    # This is an instance of PyTypeObject and represents the Python
+    # function type. It is exposed to Python programmers as
+    # types.FunctionType.
+
+    bint PyFunction_Check(object o)
+    # Return true if o is a function object (has type
+    # PyFunction_Type). The parameter must not be NULL.
+
+    object PyFunction_New(object code, object globals)
+    # Return value: New reference.
+    # Return a new function object associated with the code object
+    # code. globals must be a dictionary with the global variables
+    # accessible to the function.
+    # The function's docstring, name and __module__ are retrieved from
+    # the code object, the argument defaults and closure are set to
+    # NULL.
+
+    PyObject* PyFunction_GetCode(object op) except? NULL
+    # Return value: Borrowed reference.
+    # Return the code object associated with the function object op.
+
+    PyObject* PyFunction_GetGlobals(object op) except? NULL
+    # Return value: Borrowed reference.
+    # Return the globals dictionary associated with the function object op.
+
+    PyObject* PyFunction_GetModule(object op) except? NULL
+    # Return value: Borrowed reference.
+    # Return the __module__ attribute of the function object op. This
+    # is normally a string containing the module name, but can be set
+    # to any other object by Python code.
+
+    PyObject* PyFunction_GetDefaults(object op) except? NULL
+    # Return value: Borrowed reference.
+    # Return the argument default values of the function object
+    # op. This can be a tuple of arguments or NULL.
+
+    int PyFunction_SetDefaults(object op, object defaults) except -1
+    # Set the argument default values for the function object
+    # op. defaults must be Py_None or a tuple.
+    # Raises SystemError and returns -1 on failure.
+
+    PyObject* PyFunction_GetClosure(object op) except? NULL
+    # Return value: Borrowed reference.
+    # Return the closure associated with the function object op. This
+    # can be NULL or a tuple of cell objects.
+
+    int PyFunction_SetClosure(object op, object closure) except -1
+    # Set the closure associated with the function object op. closure
+    # must be Py_None or a tuple of cell objects.
+    # Raises SystemError and returns -1 on failure.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/getargs.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/getargs.pxd
new file mode 100644
index 00000000000..be6df3285a7
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/getargs.pxd
@@ -0,0 +1,12 @@
+
+cdef extern from "Python.h":
+    #####################################################################
+    # 5.5 Parsing arguments and building values
+    #####################################################################
+    ctypedef struct va_list
+    int PyArg_ParseTuple(object args, char *format, ...) except 0
+    int PyArg_VaParse(object args, char *format, va_list vargs) except 0
+    int PyArg_ParseTupleAndKeywords(object args, object kw, char *format, char *keywords[], ...) except 0
+    int PyArg_VaParseTupleAndKeywords(object args, object kw, char *format, char *keywords[], va_list vargs) except 0
+    int PyArg_Parse(object args, char *format, ...) except 0
+    int PyArg_UnpackTuple(object args, char *name, Py_ssize_t min, Py_ssize_t max, ...) except 0
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/instance.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/instance.pxd
new file mode 100644
index 00000000000..aecdc0cfd76
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/instance.pxd
@@ -0,0 +1,25 @@
+cdef extern from "Python.h":
+
+    ############################################################################
+    # 7.5.2 Instance Objects
+    ############################################################################
+
+    # PyTypeObject PyInstance_Type
+    #
+    # Type object for class instances.
+
+    int PyInstance_Check(object obj)
+    # Return true if obj is an instance.
+
+    object PyInstance_New(object cls, object arg, object kw)
+    # Return value: New reference.
+    # Create a new instance of a specific class. The parameters arg
+    # and kw are used as the positional and keyword parameters to the
+    # object's constructor.
+
+    object PyInstance_NewRaw(object cls, object dict)
+    # Return value: New reference.
+    # Create a new instance of a specific class without calling its
+    # constructor. class is the class of new object. The dict
+    # parameter will be used as the object's __dict__; if NULL, a new
+    # dictionary will be created for the instance.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/int.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/int.pxd
new file mode 100644
index 00000000000..50babff6151
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/int.pxd
@@ -0,0 +1,89 @@
+cdef extern from "Python.h":
+    ctypedef unsigned long long PY_LONG_LONG
+
+    ############################################################################
+    # Integer Objects
+    ############################################################################
+    # PyTypeObject PyInt_Type
+    # This instance of PyTypeObject represents the Python plain
+    # integer type. This is the same object as int and types.IntType.
+
+    bint PyInt_Check(object  o)
+    # Return true if o is of type PyInt_Type or a subtype of
+    # PyInt_Type.
+
+    bint PyInt_CheckExact(object  o)
+    # Return true if o is of type PyInt_Type, but not a subtype of
+    # PyInt_Type.
+
+    object PyInt_FromString(char *str, char **pend, int base)
+    # Return value: New reference.
+    # Return a new PyIntObject or PyLongObject based on the string
+    # value in str, which is interpreted according to the radix in
+    # base. If pend is non-NULL, *pend will point to the first
+    # character in str which follows the representation of the
+    # number. If base is 0, the radix will be determined based on the
+    # leading characters of str: if str starts with '0x' or '0X',
+    # radix 16 will be used; if str starts with '0', radix 8 will be
+    # used; otherwise radix 10 will be used. If base is not 0, it must
+    # be between 2 and 36, inclusive. Leading spaces are ignored. If
+    # there are no digits, ValueError will be raised. If the string
+    # represents a number too large to be contained within the
+    # machine's long int type and overflow warnings are being
+    # suppressed, a PyLongObject will be returned. If overflow
+    # warnings are not being suppressed, NULL will be returned in this
+    # case.
+
+    object PyInt_FromLong(long ival)
+    # Return value: New reference.
+    # Create a new integer object with a value of ival.
+    # The current implementation keeps an array of integer objects for
+    # all integers between -5 and 256, when you create an int in that
+    # range you actually just get back a reference to the existing
+    # object. So it should be possible to change the value of 1. I
+    # suspect the behaviour of Python in this case is undefined. :-)
+
+    object PyInt_FromSsize_t(Py_ssize_t ival)
+    # Return value: New reference.
+    # Create a new integer object with a value of ival. If the value
+    # is larger than LONG_MAX or smaller than LONG_MIN, a long integer
+    # object is returned.
+
+    object PyInt_FromSize_t(size_t ival)
+    # Return value: New reference.
+    # Create a new integer object with a value of ival. If the value
+    # exceeds LONG_MAX, a long integer object is returned.
+
+    long PyInt_AsLong(object io) except? -1
+    # Will first attempt to cast the object to a PyIntObject, if it is
+    # not already one, and then return its value. If there is an
+    # error, -1 is returned, and the caller should check
+    # PyErr_Occurred() to find out whether there was an error, or
+    # whether the value just happened to be -1.
+
+    long PyInt_AS_LONG(object io)
+    # Return the value of the object io. No error checking is performed.
+
+    unsigned long PyInt_AsUnsignedLongMask(object io) except? -1
+    # Will first attempt to cast the object to a PyIntObject or
+    # PyLongObject, if it is not already one, and then return its
+    # value as unsigned long. This function does not check for
+    # overflow.
+
+    PY_LONG_LONG PyInt_AsUnsignedLongLongMask(object io) except? -1
+    # Will first attempt to cast the object to a PyIntObject or
+    # PyLongObject, if it is not already one, and then return its
+    # value as unsigned long long, without checking for overflow.
+
+    Py_ssize_t PyInt_AsSsize_t(object io) except? -1
+    # Will first attempt to cast the object to a PyIntObject or
+    # PyLongObject, if it is not already one, and then return its
+    # value as Py_ssize_t.
+
+    long PyInt_GetMax()
+    # Return the system's idea of the largest integer it can handle
+    # (LONG_MAX, as defined in the system header files).
+
+    int PyInt_ClearFreeList()
+    # Clear the integer free list. Return the number of items that could not be freed.
+    # New in version 2.6.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/iterator.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/iterator.pxd
new file mode 100644
index 00000000000..0e10907f7f1
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/iterator.pxd
@@ -0,0 +1,36 @@
+cdef extern from "Python.h":
+
+    ############################################################################
+    # 6.5 Iterator Protocol
+    ############################################################################
+    bint PyIter_Check(object o)
+    # Return true if the object o supports the iterator protocol.
+
+    object PyIter_Next(object o)
+    # Return value: New reference.
+    # Return the next value from the iteration o. If the object is an
+    # iterator, this retrieves the next value from the iteration, and
+    # returns NULL with no exception set if there are no remaining
+    # items. If the object is not an iterator, TypeError is raised, or
+    # if there is an error in retrieving the item, returns NULL and
+    # passes along the exception.
+
+    # To write a loop which iterates over an iterator, the C code should look something like this:
+    # PyObject *iterator = PyObject_GetIter(obj);
+    # PyObject *item;
+    # if (iterator == NULL) {
+    # /* propagate error */
+    # }
+    # while (item = PyIter_Next(iterator)) {
+    # /* do something with item */
+    # ...
+    # /* release reference when done */
+    # Py_DECREF(item);
+    # }
+    # Py_DECREF(iterator);
+    # if (PyErr_Occurred()) {
+    # /* propagate error */
+    # }
+    # else {
+    # /* continue doing useful work */
+    # }
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/list.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/list.pxd
new file mode 100644
index 00000000000..1d0503c2c1a
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/list.pxd
@@ -0,0 +1,92 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+
+    ############################################################################
+    # Lists
+    ############################################################################
+    list PyList_New(Py_ssize_t len)
+    # Return a new list of length len on success, or NULL on failure.
+    #
+    # Note: If length is greater than zero, the returned list object's
+    # items are set to NULL. Thus you cannot use abstract API
+    # functions such as PySequence_SetItem() or expose the object to
+    # Python code before setting all items to a real object with
+    # PyList_SetItem().
+
+    bint PyList_Check(object p)
+    # Return true if p is a list object or an instance of a subtype of
+    # the list type.
+
+    bint PyList_CheckExact(object p)
+    # Return true if p is a list object, but not an instance of a
+    # subtype of the list type.
+
+    Py_ssize_t PyList_Size(object list) except -1
+    # Return the length of the list object in list; this is equivalent
+    # to "len(list)" on a list object.
+
+    Py_ssize_t PyList_GET_SIZE(object list)
+    # Macro form of PyList_Size() without error checking.
+
+    PyObject* PyList_GetItem(object list, Py_ssize_t index) except NULL
+    # Return value: Borrowed reference.
+    # Return the object at position pos in the list pointed to by
+    # p. The position must be positive, indexing from the end of the
+    # list is not supported. If pos is out of bounds, return NULL and
+    # set an IndexError exception.
+
+    PyObject* PyList_GET_ITEM(object list, Py_ssize_t i)
+    # Return value: Borrowed reference.
+    # Macro form of PyList_GetItem() without error checking.
+
+    int PyList_SetItem(object list, Py_ssize_t index, object item) except -1
+    # Set the item at index index in list to item. Return 0 on success
+    # or -1 on failure.
+    #
+    # WARNING: This function _steals_ a reference to item and discards a
+    # reference to an item already in the list at the affected position.
+
+    void PyList_SET_ITEM(object list, Py_ssize_t i, object o)
+    # Macro form of PyList_SetItem() without error checking. This is
+    # normally only used to fill in new lists where there is no
+    # previous content.
+    #
+    # WARNING: This function _steals_ a reference to item, and, unlike
+    # PyList_SetItem(), does not discard a reference to any item that
+    # it being replaced; any reference in list at position i will be *leaked*.
+
+    int PyList_Insert(object list, Py_ssize_t index, object item) except -1
+    # Insert the item item into list list in front of index
+    # index. Return 0 if successful; return -1 and set an exception if
+    # unsuccessful. Analogous to list.insert(index, item).
+
+    int PyList_Append(object list, object item) except -1
+    # Append the object item at the end of list list. Return 0 if
+    # successful; return -1 and set an exception if
+    # unsuccessful. Analogous to list.append(item).
+
+    list PyList_GetSlice(object list, Py_ssize_t low, Py_ssize_t high)
+    # Return value: New reference.
+    # Return a list of the objects in list containing the objects
+    # between low and high. Return NULL and set an exception if
+    # unsuccessful. Analogous to list[low:high].
+
+    int PyList_SetSlice(object list, Py_ssize_t low, Py_ssize_t high, object itemlist) except -1
+    # Set the slice of list between low and high to the contents of
+    # itemlist. Analogous to list[low:high] = itemlist. The itemlist
+    # may be NULL, indicating the assignment of an empty list (slice
+    # deletion). Return 0 on success, -1 on failure.
+
+    int PyList_Sort(object list) except -1
+    # Sort the items of list in place. Return 0 on success, -1 on
+    # failure. This is equivalent to "list.sort()".
+
+    int PyList_Reverse(object list) except -1
+    # Reverse the items of list in place. Return 0 on success, -1 on
+    # failure. This is the equivalent of "list.reverse()".
+
+    tuple PyList_AsTuple(object list)
+    # Return value: New reference.
+    # Return a new tuple object containing the contents of list;
+    # equivalent to "tuple(list)".
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/long.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/long.pxd
new file mode 100644
index 00000000000..f65cd0073ac
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/long.pxd
@@ -0,0 +1,149 @@
+
+cdef extern from "Python.h":
+    ctypedef long long PY_LONG_LONG
+    ctypedef unsigned long long uPY_LONG_LONG "unsigned PY_LONG_LONG"
+
+    ############################################################################
+    # 7.2.3 Long Integer Objects
+    ############################################################################
+
+    # PyLongObject
+    #
+    # This subtype of PyObject represents a Python long integer object.
+
+    # PyTypeObject PyLong_Type
+    #
+    # This instance of PyTypeObject represents the Python long integer
+    # type. This is the same object as long and types.LongType.
+
+    bint PyLong_Check(object p)
+    # Return true if its argument is a PyLongObject or a subtype of PyLongObject.
+
+    bint PyLong_CheckExact(object p)
+    # Return true if its argument is a PyLongObject, but not a subtype of PyLongObject.
+
+    object PyLong_FromLong(long v)
+    # Return value: New reference.
+    # Return a new PyLongObject object from v, or NULL on failure.
+
+    object PyLong_FromUnsignedLong(unsigned long v)
+    # Return value: New reference.
+    # Return a new PyLongObject object from a C unsigned long, or NULL on failure.
+
+    object PyLong_FromSsize_t(Py_ssize_t v)
+    # Return value: New reference.
+    # Return a new PyLongObject object from a C Py_ssize_t, or NULL on failure.)
+
+    object PyLong_FromSize_t(size_t v)
+    # Return value: New reference.
+    # Return a new PyLongObject object from a C size_t, or NULL on failure.
+
+    object PyLong_FromLongLong(PY_LONG_LONG v)
+    # Return value: New reference.
+    # Return a new PyLongObject object from a C long long, or NULL on failure.
+
+    object PyLong_FromUnsignedLongLong(uPY_LONG_LONG v)
+    # Return value: New reference.
+    # Return a new PyLongObject object from a C unsigned long long, or NULL on failure.
+
+    object PyLong_FromDouble(double v)
+    # Return value: New reference.
+    # Return a new PyLongObject object from the integer part of v, or NULL on failure.
+
+    object PyLong_FromString(char *str, char **pend, int base)
+    # Return value: New reference.
+    # Return a new PyLongObject based on the string value in str,
+    # which is interpreted according to the radix in base. If pend is
+    # non-NULL, *pend will point to the first character in str which
+    # follows the representation of the number. If base is 0, the
+    # radix will be determined based on the leading characters of str:
+    # if str starts with '0x' or '0X', radix 16 will be used; if str
+    # starts with '0', radix 8 will be used; otherwise radix 10 will
+    # be used. If base is not 0, it must be between 2 and 36,
+    # inclusive. Leading spaces are ignored. If there are no digits,
+    # ValueError will be raised.
+
+    object PyLong_FromUnicode(Py_UNICODE *u, Py_ssize_t length, int base)
+    # Return value: New reference.
+    # Convert a sequence of Unicode digits to a Python long integer
+    # value. The first parameter, u, points to the first character of
+    # the Unicode string, length gives the number of characters, and
+    # base is the radix for the conversion. The radix must be in the
+    # range [2, 36]; if it is out of range, ValueError will be
+    # raised.
+
+    # object PyLong_FromUnicodeObject(object u, int base)
+    # Convert a sequence of Unicode digits in the string u to a Python integer
+    # value. The Unicode string is first encoded to a byte string using
+    # PyUnicode_EncodeDecimal() and then converted using PyLong_FromString().
+    # New in version 3.3.
+
+    object PyLong_FromVoidPtr(void *p)
+    # Return value: New reference.
+    # Create a Python integer or long integer from the pointer p. The
+    # pointer value can be retrieved from the resulting value using
+    # PyLong_AsVoidPtr().  If the integer is larger than LONG_MAX, a
+    # positive long integer is returned.
+
+    long PyLong_AsLong(object pylong) except? -1
+    # Return a C long representation of the contents of pylong. If
+    # pylong is greater than LONG_MAX, an OverflowError is raised.
+
+    long PyLong_AsLongAndOverflow(object pylong, int *overflow) except? -1
+    # Return a C long representation of the contents of pylong. If pylong is
+    # greater than LONG_MAX or less than LONG_MIN, set *overflow to 1 or -1,
+    # respectively, and return -1; otherwise, set *overflow to 0. If any other
+    # exception occurs (for example a TypeError or MemoryError), then -1 will
+    # be returned and *overflow will be 0.
+    # New in version 2.7.
+
+    PY_LONG_LONG PyLong_AsLongLongAndOverflow(object pylong, int *overflow) except? -1
+    # Return a C long long representation of the contents of pylong. If pylong
+    # is greater than PY_LLONG_MAX or less than PY_LLONG_MIN, set *overflow to
+    # 1 or -1, respectively, and return -1; otherwise, set *overflow to 0. If
+    # any other exception occurs (for example a TypeError or MemoryError), then
+    # -1 will be returned and *overflow will be 0.
+    # New in version 2.7.
+
+    Py_ssize_t PyLong_AsSsize_t(object pylong) except? -1
+    # Return a C Py_ssize_t representation of the contents of pylong. If pylong
+    # is greater than PY_SSIZE_T_MAX, an OverflowError is raised and -1 will be
+    # returned.
+
+    unsigned long PyLong_AsUnsignedLong(object pylong) except? -1
+    # Return a C unsigned long representation of the contents of
+    # pylong. If pylong is greater than ULONG_MAX, an OverflowError is
+    # raised.
+
+    PY_LONG_LONG PyLong_AsLongLong(object pylong) except? -1
+    # Return a C long long from a Python long integer. If pylong
+    # cannot be represented as a long long, an OverflowError will be
+    # raised.
+
+    uPY_LONG_LONG PyLong_AsUnsignedLongLong(object pylong) except? -1
+    #unsigned PY_LONG_LONG PyLong_AsUnsignedLongLong(object pylong)
+    # Return a C unsigned long long from a Python long integer. If
+    # pylong cannot be represented as an unsigned long long, an
+    # OverflowError will be raised if the value is positive, or a
+    # TypeError will be raised if the value is negative.
+
+    unsigned long PyLong_AsUnsignedLongMask(object io) except? -1
+    # Return a C unsigned long from a Python long integer, without
+    # checking for overflow.
+
+    uPY_LONG_LONG PyLong_AsUnsignedLongLongMask(object io) except? -1
+    #unsigned PY_LONG_LONG PyLong_AsUnsignedLongLongMask(object io)
+    # Return a C unsigned long long from a Python long integer,
+    # without checking for overflow.
+
+    double PyLong_AsDouble(object pylong) except? -1.0
+    # Return a C double representation of the contents of pylong. If
+    # pylong cannot be approximately represented as a double, an
+    # OverflowError exception is raised and -1.0 will be returned.
+
+    void* PyLong_AsVoidPtr(object pylong) except? NULL
+    # Convert a Python integer or long integer pylong to a C void
+    # pointer. If pylong cannot be converted, an OverflowError will be
+    # raised. This is only assured to produce a usable void pointer
+    # for values created with PyLong_FromVoidPtr(). For values outside
+    # 0..LONG_MAX, both signed and unsigned integers are accepted.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/mapping.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/mapping.pxd
new file mode 100644
index 00000000000..5e54af531ea
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/mapping.pxd
@@ -0,0 +1,63 @@
+cdef extern from "Python.h":
+
+    ############################################################################
+    # 6.4 Mapping Protocol
+    ############################################################################
+
+    bint PyMapping_Check(object o)
+    # Return 1 if the object provides mapping protocol, and 0
+    # otherwise. This function always succeeds.
+
+    Py_ssize_t PyMapping_Length(object o) except -1
+    # Returns the number of keys in object o on success, and -1 on
+    # failure. For objects that do not provide mapping protocol, this
+    # is equivalent to the Python expression "len(o)".
+
+    int PyMapping_DelItemString(object o, char *key) except -1
+    # Remove the mapping for object key from the object o. Return -1
+    # on failure. This is equivalent to the Python statement "del
+    # o[key]".
+
+    int PyMapping_DelItem(object o, object key) except -1
+    # Remove the mapping for object key from the object o. Return -1
+    # on failure. This is equivalent to the Python statement "del
+    # o[key]".
+
+    bint PyMapping_HasKeyString(object o, char *key)
+    # On success, return 1 if the mapping object has the key key and 0
+    # otherwise. This is equivalent to the Python expression
+    # "o.has_key(key)". This function always succeeds.
+
+    bint PyMapping_HasKey(object o, object key)
+    # Return 1 if the mapping object has the key key and 0
+    # otherwise. This is equivalent to the Python expression
+    # "o.has_key(key)". This function always succeeds.
+
+    object PyMapping_Keys(object o)
+    # Return value: New reference.
+    # On success, return a list of the keys in object o. On failure,
+    # return NULL. This is equivalent to the Python expression
+    # "o.keys()".
+
+    object PyMapping_Values(object o)
+    # Return value: New reference.
+    # On success, return a list of the values in object o. On failure,
+    # return NULL. This is equivalent to the Python expression
+    # "o.values()".
+
+    object PyMapping_Items(object o)
+    # Return value: New reference.
+    # On success, return a list of the items in object o, where each
+    # item is a tuple containing a key-value pair. On failure, return
+    # NULL. This is equivalent to the Python expression "o.items()".
+
+    object PyMapping_GetItemString(object o, char *key)
+    # Return value: New reference.
+    # Return element of o corresponding to the object key or NULL on
+    # failure. This is the equivalent of the Python expression
+    # "o[key]".
+
+    int PyMapping_SetItemString(object o, char *key, object v) except -1
+    # Map the object key to the value v in object o. Returns -1 on
+    # failure. This is the equivalent of the Python statement "o[key]
+    # = v".
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/mem.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/mem.pxd
new file mode 100644
index 00000000000..236d111f6ff
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/mem.pxd
@@ -0,0 +1,120 @@
+cdef extern from "Python.h":
+
+    #####################################################################
+    # 9.2 Memory Interface
+    #####################################################################
+    # You are definitely *supposed* to use these: "In most situations,
+    # however, it is recommended to allocate memory from the Python
+    # heap specifically because the latter is under control of the
+    # Python memory manager. For example, this is required when the
+    # interpreter is extended with new object types written in
+    # C. Another reason for using the Python heap is the desire to
+    # inform the Python memory manager about the memory needs of the
+    # extension module. Even when the requested memory is used
+    # exclusively for internal, highly-specific purposes, delegating
+    # all memory requests to the Python memory manager causes the
+    # interpreter to have a more accurate image of its memory
+    # footprint as a whole. Consequently, under certain circumstances,
+    # the Python memory manager may or may not trigger appropriate
+    # actions, like garbage collection, memory compaction or other
+    # preventive procedures. Note that by using the C library
+    # allocator as shown in the previous example, the allocated memory
+    # for the I/O buffer escapes completely the Python memory
+    # manager."
+
+    # The following function sets, modeled after the ANSI C standard,
+    # but specifying behavior when requesting zero bytes, are
+    # available for allocating and releasing memory from the Python
+    # heap:
+
+    void* PyMem_RawMalloc(size_t n) nogil
+    void* PyMem_Malloc(size_t n)
+    # Allocates n bytes and returns a pointer of type void* to the
+    # allocated memory, or NULL if the request fails. Requesting zero
+    # bytes returns a distinct non-NULL pointer if possible, as if
+    # PyMem_Malloc(1) had been called instead. The memory will not
+    # have been initialized in any way.
+
+    void* PyMem_RawCalloc(size_t nelem, size_t elsize) nogil
+    void* PyMem_Calloc(size_t nelem, size_t elsize)
+    # Allocates nelem elements each whose size in bytes is elsize and
+    # returns a pointer of type void* to the allocated memory, or NULL if
+    # the request fails. The memory is initialized to zeros. Requesting
+    # zero elements or elements of size zero bytes returns a distinct
+    # non-NULL pointer if possible, as if PyMem_Calloc(1, 1) had been
+    # called instead.
+
+    void* PyMem_RawRealloc(void *p, size_t n) nogil
+    void* PyMem_Realloc(void *p, size_t n)
+    # Resizes the memory block pointed to by p to n bytes. The
+    # contents will be unchanged to the minimum of the old and the new
+    # sizes. If p is NULL, the call is equivalent to PyMem_Malloc(n);
+    # else if n is equal to zero, the memory block is resized but is
+    # not freed, and the returned pointer is non-NULL. Unless p is
+    # NULL, it must have been returned by a previous call to
+    # PyMem_Malloc(), PyMem_Realloc(), or PyMem_Calloc().
+
+    void PyMem_RawFree(void *p) nogil
+    void PyMem_Free(void *p)
+    # Frees the memory block pointed to by p, which must have been
+    # returned by a previous call to PyMem_Malloc(), PyMem_Realloc(), or
+    # PyMem_Calloc(). Otherwise, or if PyMem_Free(p) has been called
+    # before, undefined behavior occurs. If p is NULL, no operation is
+    # performed.
+
+    # The following type-oriented macros are provided for
+    # convenience. Note that TYPE refers to any C type.
+
+    # TYPE* PyMem_New(TYPE, size_t n)
+    # Same as PyMem_Malloc(), but allocates (n * sizeof(TYPE)) bytes
+    # of memory. Returns a pointer cast to TYPE*. The memory will not
+    # have been initialized in any way.
+
+    # TYPE* PyMem_Resize(void *p, TYPE, size_t n)
+    # Same as PyMem_Realloc(), but the memory block is resized to (n *
+    # sizeof(TYPE)) bytes. Returns a pointer cast to TYPE*.
+
+    void PyMem_Del(void *p)
+    # Same as PyMem_Free().
+
+    # In addition, the following macro sets are provided for calling
+    # the Python memory allocator directly, without involving the C
+    # API functions listed above. However, note that their use does
+    # not preserve binary compatibility across Python versions and is
+    # therefore deprecated in extension modules.
+
+    # PyMem_MALLOC(), PyMem_REALLOC(), PyMem_FREE().
+    # PyMem_NEW(), PyMem_RESIZE(), PyMem_DEL().
+
+
+    #####################################################################
+    # Raw object memory interface
+    #####################################################################
+
+    # Functions to call the same malloc/realloc/free as used by Python's
+    # object allocator.  If WITH_PYMALLOC is enabled, these may differ from
+    # the platform malloc/realloc/free.  The Python object allocator is
+    # designed for fast, cache-conscious allocation of many "small" objects,
+    # and with low hidden memory overhead.
+    #
+    # PyObject_Malloc(0) returns a unique non-NULL pointer if possible.
+    #
+    # PyObject_Realloc(NULL, n) acts like PyObject_Malloc(n).
+    # PyObject_Realloc(p != NULL, 0) does not return  NULL, or free the memory
+    # at p.
+    #
+    # Returned pointers must be checked for NULL explicitly; no action is
+    # performed on failure other than to return NULL (no warning it printed, no
+    # exception is set, etc).
+    #
+    # For allocating objects, use PyObject_{New, NewVar} instead whenever
+    # possible.  The PyObject_{Malloc, Realloc, Free} family is exposed
+    # so that you can exploit Python's small-block allocator for non-object
+    # uses.  If you must use these routines to allocate object memory, make sure
+    # the object gets initialized via PyObject_{Init, InitVar} after obtaining
+    # the raw memory.
+
+    void* PyObject_Malloc(size_t size)
+    void* PyObject_Calloc(size_t nelem, size_t elsize)
+    void* PyObject_Realloc(void *ptr, size_t new_size)
+    void PyObject_Free(void *ptr)
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/method.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/method.pxd
new file mode 100644
index 00000000000..f51ebcc7c75
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/method.pxd
@@ -0,0 +1,49 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+    ############################################################################
+    # 7.5.4 Method Objects
+    ############################################################################
+
+    # There are some useful functions that are useful for working with method objects.
+    # PyTypeObject PyMethod_Type
+    # This instance of PyTypeObject represents the Python method type. This is exposed to Python programs as types.MethodType.
+
+    bint PyMethod_Check(object o)
+    # Return true if o is a method object (has type
+    # PyMethod_Type). The parameter must not be NULL.
+
+    object PyMethod_New(object func, object self, object cls)
+    # Return value: New reference.
+    # Return a new method object, with func being any callable object;
+    # this is the function that will be called when the method is
+    # called. If this method should be bound to an instance, self
+    # should be the instance and class should be the class of self,
+    # otherwise self should be NULL and class should be the class
+    # which provides the unbound method..
+
+    PyObject* PyMethod_Class(object meth) except NULL
+    # Return value: Borrowed reference.
+    # Return the class object from which the method meth was created;
+    # if this was created from an instance, it will be the class of
+    # the instance.
+
+    PyObject* PyMethod_GET_CLASS(object meth)
+    # Return value: Borrowed reference.
+    # Macro version of PyMethod_Class() which avoids error checking.
+
+    PyObject* PyMethod_Function(object meth) except NULL
+    # Return value: Borrowed reference.
+    # Return the function object associated with the method meth.
+
+    PyObject* PyMethod_GET_FUNCTION(object meth)
+    # Return value: Borrowed reference.
+    # Macro version of PyMethod_Function() which avoids error checking.
+
+    PyObject* PyMethod_Self(object meth) except? NULL
+    # Return value: Borrowed reference.
+    # Return the instance associated with the method meth if it is bound, otherwise return NULL.
+
+    PyObject* PyMethod_GET_SELF(object meth)
+    # Return value: Borrowed reference.
+    # Macro version of PyMethod_Self() which avoids error checking.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/module.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/module.pxd
new file mode 100644
index 00000000000..ea4c3817ed5
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/module.pxd
@@ -0,0 +1,208 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+    ctypedef struct _inittab
+
+    #####################################################################
+    # 5.3 Importing Modules
+    #####################################################################
+    object PyImport_ImportModule(const char *name)
+    # Return value: New reference.
+    # This is a simplified interface to PyImport_ImportModuleEx()
+    # below, leaving the globals and locals arguments set to
+    # NULL. When the name argument contains a dot (when it specifies a
+    # submodule of a package), the fromlist argument is set to the
+    # list ['*'] so that the return value is the named module rather
+    # than the top-level package containing it as would otherwise be
+    # the case. (Unfortunately, this has an additional side effect
+    # when name in fact specifies a subpackage instead of a submodule:
+    # the submodules specified in the package's __all__ variable are
+    # loaded.) Return a new reference to the imported module, or NULL
+    # with an exception set on failure.
+
+    object PyImport_ImportModuleEx(const char *name, object globals, object locals, object fromlist)
+    # Return value: New reference.
+
+    # Import a module. This is best described by referring to the
+    # built-in Python function __import__(), as the standard
+    # __import__() function calls this function directly.
+
+    # The return value is a new reference to the imported module or
+    # top-level package, or NULL with an exception set on failure
+    # (before Python 2.4, the module may still be created in this
+    # case). Like for __import__(), the return value when a submodule
+    # of a package was requested is normally the top-level package,
+    # unless a non-empty fromlist was given. Changed in version 2.4:
+    # failing imports remove incomplete module objects.
+
+    object PyImport_ImportModuleLevel(char *name, object globals, object locals, object fromlist, int level)
+    # Return value: New reference.
+
+    # Import a module. This is best described by referring to the
+    # built-in Python function __import__(), as the standard
+    # __import__() function calls this function directly.
+
+    # The return value is a new reference to the imported module or
+    # top-level package, or NULL with an exception set on failure. Like
+    # for __import__(), the return value when a submodule of a package
+    # was requested is normally the top-level package, unless a
+    # non-empty fromlist was given.
+
+    object PyImport_Import(object name)
+    # Return value: New reference.
+    # This is a higher-level interface that calls the current ``import
+    # hook function''. It invokes the __import__() function from the
+    # __builtins__ of the current globals. This means that the import
+    # is done using whatever import hooks are installed in the current
+    # environment, e.g. by rexec or ihooks.
+
+    object PyImport_ReloadModule(object m)
+    # Return value: New reference.
+    # Reload a module. This is best described by referring to the
+    # built-in Python function reload(), as the standard reload()
+    # function calls this function directly. Return a new reference to
+    # the reloaded module, or NULL with an exception set on failure
+    # (the module still exists in this case).
+
+    PyObject* PyImport_AddModule(const char *name) except NULL
+    # Return value: Borrowed reference.
+    # Return the module object corresponding to a module name. The
+    # name argument may be of the form package.module. First check the
+    # modules dictionary if there's one there, and if not, create a
+    # new one and insert it in the modules dictionary. Return NULL
+    # with an exception set on failure. Note: This function does not
+    # load or import the module; if the module wasn't already loaded,
+    # you will get an empty module object. Use PyImport_ImportModule()
+    # or one of its variants to import a module. Package structures
+    # implied by a dotted name for name are not created if not already
+    # present.
+
+    object PyImport_ExecCodeModule(char *name, object co)
+    # Return value: New reference.
+    # Given a module name (possibly of the form package.module) and a
+    # code object read from a Python bytecode file or obtained from
+    # the built-in function compile(), load the module. Return a new
+    # reference to the module object, or NULL with an exception set if
+    # an error occurred. Name is removed from sys.modules in error
+    # cases, and even if name was already in sys.modules on entry to
+    # PyImport_ExecCodeModule(). Leaving incompletely initialized
+    # modules in sys.modules is dangerous, as imports of such modules
+    # have no way to know that the module object is an unknown (and
+    # probably damaged with respect to the module author's intents)
+    # state.
+    # This function will reload the module if it was already
+    # imported. See PyImport_ReloadModule() for the intended way to
+    # reload a module.
+    # If name points to a dotted name of the form package.module, any
+    # package structures not already created will still not be
+    # created.
+
+
+    long PyImport_GetMagicNumber()
+    # Return the magic number for Python bytecode files (a.k.a. .pyc
+    # and .pyo files). The magic number should be present in the first
+    # four bytes of the bytecode file, in little-endian byte order.
+
+    PyObject* PyImport_GetModuleDict() except NULL
+    # Return value: Borrowed reference.
+    # Return the dictionary used for the module administration
+    # (a.k.a. sys.modules). Note that this is a per-interpreter
+    # variable.
+
+
+    int PyImport_ImportFrozenModule(char *name) except -1
+    # Load a frozen module named name. Return 1 for success, 0 if the
+    # module is not found, and -1 with an exception set if the
+    # initialization failed. To access the imported module on a
+    # successful load, use PyImport_ImportModule(). (Note the misnomer
+    # -- this function would reload the module if it was already
+    # imported.)
+
+
+    int PyImport_ExtendInittab(_inittab *newtab) except -1
+    # Add a collection of modules to the table of built-in
+    # modules. The newtab array must end with a sentinel entry which
+    # contains NULL for the name field; failure to provide the
+    # sentinel value can result in a memory fault. Returns 0 on
+    # success or -1 if insufficient memory could be allocated to
+    # extend the internal table. In the event of failure, no modules
+    # are added to the internal table. This should be called before
+    # Py_Initialize().
+
+    #####################################################################
+    # 7.5.5 Module Objects
+    #####################################################################
+
+    # PyTypeObject PyModule_Type
+    #
+    # This instance of PyTypeObject represents the Python module
+    # type. This is exposed to Python programs as types.ModuleType.
+
+    bint PyModule_Check(object p)
+    # Return true if p is a module object, or a subtype of a module
+    # object.
+
+    bint PyModule_CheckExact(object p)
+    # Return true if p is a module object, but not a subtype of PyModule_Type.
+
+    object PyModule_NewObject(object name)
+    # Return a new module object with the __name__ attribute set to name.
+    # The module’s __name__, __doc__, __package__, and __loader__
+    # attributes are filled in (all but __name__ are set to None); the caller
+    # is responsible for providing a __file__ attribute.
+
+    object PyModule_New(const char *name)
+    # Return value: New reference.
+    # Return a new module object with the __name__ attribute set to
+    # name. Only the module's __doc__ and __name__ attributes are
+    # filled in; the caller is responsible for providing a __file__
+    # attribute.
+
+    PyObject* PyModule_GetDict(object module) except NULL
+    # Return value: Borrowed reference.
+    # Return the dictionary object that implements module's namespace;
+    # this object is the same as the __dict__ attribute of the module
+    # object. This function never fails. It is recommended extensions
+    # use other PyModule_*() and PyObject_*() functions rather than
+    # directly manipulate a module's __dict__.
+
+    object PyModule_GetNameObject(object module)
+    # Return module’s __name__ value. If the module does not provide one, or if
+    # it is not a string, SystemError is raised and NULL is returned.
+
+    char* PyModule_GetName(object module) except NULL
+    # Similar to PyModule_GetNameObject() but return the name encoded
+    # to 'utf-8'.
+
+    void* PyModule_GetState(object module)
+    # Return the “state” of the module, that is, a pointer to the block of
+    # memory allocated at module creation time, or NULL.
+    # See PyModuleDef.m_size.
+
+    object PyModule_GetFilenameObject(object module)
+    # Return the name of the file from which module was loaded using module’s
+    # __file__ attribute. If this is not defined, or if it is not a unicode
+    # string, raise SystemError and return NULL; otherwise return a reference
+    # to a Unicode object.
+
+    char* PyModule_GetFilename(object module) except NULL
+    # Similar to PyModule_GetFilenameObject() but return the filename encoded
+    # to ‘utf-8’.
+
+    int PyModule_AddObject(object module,  const char *name, object value) except -1
+    # Add an object to module as name. This is a convenience function
+    # which can be used from the module's initialization function.
+    # Return -1 on error, 0 on success.
+    #
+    # WARNING: This _steals_ a reference to value.
+
+    int PyModule_AddIntConstant(object module,  const char *name, long value) except -1
+    # Add an integer constant to module as name. This convenience
+    # function can be used from the module's initialization
+    # function. Return -1 on error, 0 on success.
+
+    int PyModule_AddStringConstant(object module,  const char *name,  const char *value) except -1
+    # Add a string constant to module as name. This convenience
+    # function can be used from the module's initialization
+    # function. The string value must be null-terminated. Return -1 on
+    # error, 0 on success.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/number.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/number.pxd
new file mode 100644
index 00000000000..ded35c292a6
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/number.pxd
@@ -0,0 +1,265 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+
+    #####################################################################
+    # 6.2 Number Protocol
+    #####################################################################
+
+    bint PyNumber_Check(object o)
+    # Returns 1 if the object o provides numeric protocols, and false
+    # otherwise. This function always succeeds.
+
+    object PyNumber_Add(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of adding o1 and o2, or NULL on failure. This
+    # is the equivalent of the Python expression "o1 + o2".
+
+    object PyNumber_Subtract(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of subtracting o2 from o1, or NULL on
+    # failure. This is the equivalent of the Python expression "o1 -
+    # o2".
+
+    object PyNumber_Multiply(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of multiplying o1 and o2, or NULL on
+    # failure. This is the equivalent of the Python expression "o1 *
+    # o2".
+
+    object PyNumber_MatrixMultiply(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of matrix multiplication on o1 and o2, or
+    # NULL on failure. This is the equivalent of the Python
+    # expression "o1 @ o2".
+    # New in version 3.5.
+
+    object PyNumber_Divide(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of dividing o1 by o2, or NULL on
+    # failure. This is the equivalent of the Python expression "o1 /
+    # o2".
+
+    object PyNumber_FloorDivide(object o1, object o2)
+    # Return value: New reference.
+    # Return the floor of o1 divided by o2, or NULL on failure. This
+    # is equivalent to the ``classic'' division of integers.
+
+    object PyNumber_TrueDivide(object o1, object o2)
+    # Return value: New reference.
+    # Return a reasonable approximation for the mathematical value of
+    # o1 divided by o2, or NULL on failure. The return value is
+    # ``approximate'' because binary floating point numbers are
+    # approximate; it is not possible to represent all real numbers in
+    # base two. This function can return a floating point value when
+    # passed two integers.
+
+    object PyNumber_Remainder(object o1, object o2)
+    # Return value: New reference.
+    # Returns the remainder of dividing o1 by o2, or NULL on
+    # failure. This is the equivalent of the Python expression "o1 %
+    # o2".
+
+    object PyNumber_Divmod(object o1, object o2)
+    # Return value: New reference.
+    # See the built-in function divmod(). Returns NULL on
+    # failure. This is the equivalent of the Python expression
+    # "divmod(o1, o2)".
+
+    object PyNumber_Power(object o1, object o2, object o3)
+    # Return value: New reference.
+    # See the built-in function pow(). Returns NULL on failure. This
+    # is the equivalent of the Python expression "pow(o1, o2, o3)",
+    # where o3 is optional. If o3 is to be ignored, pass Py_None in
+    # its place (passing NULL for o3 would cause an illegal memory
+    # access).
+
+    object PyNumber_Negative(object o)
+    # Return value: New reference.
+    # Returns the negation of o on success, or NULL on failure. This
+    # is the equivalent of the Python expression "-o".
+
+    object PyNumber_Positive(object o)
+    # Return value: New reference.
+    # Returns o on success, or NULL on failure. This is the equivalent
+    # of the Python expression "+o".
+
+    object PyNumber_Absolute(object o)
+    # Return value: New reference.
+    # Returns the absolute value of o, or NULL on failure. This is the
+    # equivalent of the Python expression "abs(o)".
+
+    object PyNumber_Invert(object o)
+    # Return value: New reference.
+    # Returns the bitwise negation of o on success, or NULL on
+    # failure. This is the equivalent of the Python expression "~o".
+
+    object PyNumber_Lshift(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of left shifting o1 by o2 on success, or NULL
+    # on failure. This is the equivalent of the Python expression "o1
+    # << o2".
+
+    object PyNumber_Rshift(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of right shifting o1 by o2 on success, or
+    # NULL on failure. This is the equivalent of the Python expression
+    # "o1 >> o2".
+
+    object PyNumber_And(object o1, object o2)
+    # Return value: New reference.
+    # Returns the ``bitwise and'' of o1 and o2 on success and NULL on
+    # failure. This is the equivalent of the Python expression "o1 &
+    # o2".
+
+    object PyNumber_Xor(object o1, object o2)
+    # Return value: New reference.
+    # Returns the ``bitwise exclusive or'' of o1 by o2 on success, or
+    # NULL on failure. This is the equivalent of the Python expression
+    # "o1 ^ o2".
+
+    object PyNumber_Or(object o1, object o2)
+    # Return value: New reference.
+    # Returns the ``bitwise or'' of o1 and o2 on success, or NULL on failure. This is the equivalent of the Python expression "o1 | o2".
+
+    object PyNumber_InPlaceAdd(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of adding o1 and o2, or NULL on failure. The
+    # operation is done in-place when o1 supports it. This is the
+    # equivalent of the Python statement "o1 += o2".
+
+    object PyNumber_InPlaceSubtract(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of subtracting o2 from o1, or NULL on
+    # failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 -= o2".
+
+    object PyNumber_InPlaceMultiply(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of multiplying o1 and o2, or NULL on
+    # failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 *= o2".
+
+    object PyNumber_InPlaceMatrixMultiply(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of matrix multiplication on o1 and o2, or
+    # NULL on failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 @= o2".
+    # New in version 3.5.
+
+    object PyNumber_InPlaceDivide(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of dividing o1 by o2, or NULL on failure. The
+    # operation is done in-place when o1 supports it. This is the
+    # equivalent of the Python statement "o1 /= o2".
+
+    object PyNumber_InPlaceFloorDivide(object o1, object o2)
+    # Return value: New reference.
+    # Returns the mathematical floor of dividing o1 by o2, or NULL on
+    # failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 //=
+    # o2".
+
+    object PyNumber_InPlaceTrueDivide(object o1, object o2)
+    # Return value: New reference.
+    # Return a reasonable approximation for the mathematical value of
+    # o1 divided by o2, or NULL on failure. The return value is
+    # ``approximate'' because binary floating point numbers are
+    # approximate; it is not possible to represent all real numbers in
+    # base two. This function can return a floating point value when
+    # passed two integers. The operation is done in-place when o1
+    # supports it.
+
+    object PyNumber_InPlaceRemainder(object o1, object o2)
+    # Return value: New reference.
+    # Returns the remainder of dividing o1 by o2, or NULL on
+    # failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 %= o2".
+
+    object PyNumber_InPlacePower(object o1, object o2, object o3)
+    # Return value: New reference.
+    # See the built-in function pow(). Returns NULL on failure. The
+    # operation is done in-place when o1 supports it. This is the
+    # equivalent of the Python statement "o1 **= o2" when o3 is
+    # Py_None, or an in-place variant of "pow(o1, o2, o3)"
+    # otherwise. If o3 is to be ignored, pass Py_None in its place
+    # (passing NULL for o3 would cause an illegal memory access).
+
+    object PyNumber_InPlaceLshift(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of left shifting o1 by o2 on success, or NULL
+    # on failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 <<= o2".
+
+    object PyNumber_InPlaceRshift(object o1, object o2)
+    # Return value: New reference.
+    # Returns the result of right shifting o1 by o2 on success, or
+    # NULL on failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 >>= o2".
+
+    object PyNumber_InPlaceAnd(object o1, object o2)
+    # Return value: New reference.
+    # Returns the ``bitwise and'' of o1 and o2 on success and NULL on
+    # failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 &= o2".
+
+    object PyNumber_InPlaceXor(object o1, object o2)
+    # Return value: New reference.
+    # Returns the ``bitwise exclusive or'' of o1 by o2 on success, or
+    # NULL on failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 ^= o2".
+
+    object PyNumber_InPlaceOr(object o1, object o2)
+    # Return value: New reference.
+    # Returns the ``bitwise or'' of o1 and o2 on success, or NULL on
+    # failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python statement "o1 |= o2".
+
+    int PyNumber_Coerce(PyObject **p1, PyObject **p2) except -1
+    # This function takes the addresses of two variables of type
+    # PyObject*. If the objects pointed to by *p1 and *p2 have the
+    # same type, increment their reference count and return 0
+    # (success). If the objects can be converted to a common numeric
+    # type, replace *p1 and *p2 by their converted value (with 'new'
+    # reference counts), and return 0. If no conversion is possible,
+    # or if some other error occurs, return -1 (failure) and don't
+    # increment the reference counts. The call PyNumber_Coerce(&o1,
+    # &o2) is equivalent to the Python statement "o1, o2 = coerce(o1,
+    # o2)".
+
+    object PyNumber_Int(object o)
+    # Return value: New reference.
+    # Returns the o converted to an integer object on success, or NULL
+    # on failure. If the argument is outside the integer range a long
+    # object will be returned instead. This is the equivalent of the
+    # Python expression "int(o)".
+
+    object PyNumber_Long(object o)
+    # Return value: New reference.
+    # Returns the o converted to a long integer object on success, or
+    # NULL on failure. This is the equivalent of the Python expression
+    # "long(o)".
+
+    object PyNumber_Float(object o)
+    # Return value: New reference.
+    # Returns the o converted to a float object on success, or NULL on
+    # failure. This is the equivalent of the Python expression
+    # "float(o)".
+
+    object PyNumber_Index(object o)
+    # Returns the o converted to a Python int or long on success or
+    # NULL with a TypeError exception raised on failure.
+
+    Py_ssize_t PyNumber_AsSsize_t(object o, object exc) except? -1
+    # Returns o converted to a Py_ssize_t value if o can be
+    # interpreted as an integer. If o can be converted to a Python int
+    # or long but the attempt to convert to a Py_ssize_t value would
+    # raise an OverflowError, then the exc argument is the type of
+    # exception that will be raised (usually IndexError or
+    # OverflowError). If exc is NULL, then the exception is cleared
+    # and the value is clipped to PY_SSIZE_T_MIN for a negative
+    # integer or PY_SSIZE_T_MAX for a positive integer.
+
+    bint PyIndex_Check(object)
+    # Returns True if o is an index integer (has the nb_index slot of
+    # the tp_as_number structure filled in).
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/object.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/object.pxd
new file mode 100644
index 00000000000..41874159ce7
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/object.pxd
@@ -0,0 +1,440 @@
+from libc.stdio cimport FILE
+cimport cpython.type
+
+cdef extern from "Python.h":
+
+    ctypedef struct PyObject  # forward declaration
+
+    ctypedef object (*newfunc)(cpython.type.type, PyObject*, PyObject*)  # (type, args|NULL, kwargs|NULL)
+
+    ctypedef object (*unaryfunc)(object)
+    ctypedef object (*binaryfunc)(object, object)
+    ctypedef object (*ternaryfunc)(object, object, object)
+    ctypedef int (*inquiry)(object) except -1
+    ctypedef Py_ssize_t (*lenfunc)(object) except -1
+    ctypedef object (*ssizeargfunc)(object, Py_ssize_t)
+    ctypedef object (*ssizessizeargfunc)(object, Py_ssize_t, Py_ssize_t)
+    ctypedef int (*ssizeobjargproc)(object, Py_ssize_t, object) except -1
+    ctypedef int (*ssizessizeobjargproc)(object, Py_ssize_t, Py_ssize_t, object) except -1
+    ctypedef int (*objobjargproc)(object, object, object) except -1
+    ctypedef int (*objobjproc)(object, object) except -1
+
+    ctypedef Py_hash_t (*hashfunc)(object) except -1
+    ctypedef object (*reprfunc)(object)
+
+    ctypedef int (*cmpfunc)(object, object) except -2
+    ctypedef object (*richcmpfunc)(object, object, int)
+
+    # The following functions use 'PyObject*' as first argument instead of 'object' to prevent
+    # accidental reference counting when calling them during a garbage collection run.
+    ctypedef void (*destructor)(PyObject*)
+    ctypedef int (*visitproc)(PyObject*, void *) except -1
+    ctypedef int (*traverseproc)(PyObject*, visitproc, void*) except -1
+    ctypedef void (*freefunc)(void*)
+
+    ctypedef object (*descrgetfunc)(object, object, object)
+    ctypedef int (*descrsetfunc)(object, object, object) except -1
+
+    ctypedef object (*PyCFunction)(object, object)
+
+    ctypedef struct PyMethodDef:
+        const char* ml_name
+        PyCFunction ml_meth
+        int ml_flags
+        const char* ml_doc
+
+    ctypedef struct PyTypeObject:
+        const char* tp_name
+        const char* tp_doc
+        Py_ssize_t tp_basicsize
+        Py_ssize_t tp_itemsize
+        Py_ssize_t tp_dictoffset
+        unsigned long tp_flags
+
+        newfunc tp_new
+        destructor tp_dealloc
+        destructor tp_del
+        destructor tp_finalize
+        traverseproc tp_traverse
+        inquiry tp_clear
+        freefunc tp_free
+
+        ternaryfunc tp_call
+        hashfunc tp_hash
+        reprfunc tp_str
+        reprfunc tp_repr
+
+        cmpfunc tp_compare
+        richcmpfunc tp_richcompare
+
+        PyMethodDef* tp_methods
+
+        PyTypeObject* tp_base
+        PyObject* tp_dict
+
+        descrgetfunc tp_descr_get
+        descrsetfunc tp_descr_set
+
+        unsigned int tp_version_tag
+
+    ctypedef struct PyObject:
+        Py_ssize_t ob_refcnt
+        PyTypeObject *ob_type
+
+    cdef PyTypeObject *Py_TYPE(object)
+
+    void* PyObject_Malloc(size_t)
+    void* PyObject_Realloc(void *, size_t)
+    void PyObject_Free(void *)
+
+    #####################################################################
+    # 6.1 Object Protocol
+    #####################################################################
+    int PyObject_Print(object o, FILE *fp, int flags) except -1
+    # Print an object o, on file fp. Returns -1 on error. The flags
+    # argument is used to enable certain printing options. The only
+    # option currently supported is Py_PRINT_RAW; if given, the str()
+    # of the object is written instead of the repr().
+
+    bint PyObject_HasAttrString(object o, const char *attr_name)
+    # Returns 1 if o has the attribute attr_name, and 0
+    # otherwise. This is equivalent to the Python expression
+    # "hasattr(o, attr_name)". This function always succeeds.
+
+    object PyObject_GetAttrString(object o, const char *attr_name)
+    # Return value: New reference.  Retrieve an attribute named
+    # attr_name from object o. Returns the attribute value on success,
+    # or NULL on failure. This is the equivalent of the Python
+    # expression "o.attr_name".
+
+    bint PyObject_HasAttr(object o, object attr_name)
+    # Returns 1 if o has the attribute attr_name, and 0
+    # otherwise. This is equivalent to the Python expression
+    # "hasattr(o, attr_name)". This function always succeeds.
+
+    object PyObject_GetAttr(object o, object attr_name)
+    # Return value: New reference.  Retrieve an attribute named
+    # attr_name from object o. Returns the attribute value on success,
+    # or NULL on failure. This is the equivalent of the Python
+    # expression "o.attr_name".
+
+    object PyObject_GenericGetAttr(object o, object attr_name)
+
+    int PyObject_SetAttrString(object o, const char *attr_name, object v) except -1
+    # Set the value of the attribute named attr_name, for object o, to
+    # the value v. Returns -1 on failure. This is the equivalent of
+    # the Python statement "o.attr_name = v".
+
+    int PyObject_SetAttr(object o, object attr_name, object v) except -1
+    # Set the value of the attribute named attr_name, for object o, to
+    # the value v. Returns -1 on failure. This is the equivalent of
+    # the Python statement "o.attr_name = v".
+
+    int PyObject_GenericSetAttr(object o, object attr_name, object v) except -1
+
+    int PyObject_DelAttrString(object o, const char *attr_name) except -1
+    # Delete attribute named attr_name, for object o. Returns -1 on
+    # failure. This is the equivalent of the Python statement: "del
+    # o.attr_name".
+
+    int PyObject_DelAttr(object o, object attr_name) except -1
+    # Delete attribute named attr_name, for object o. Returns -1 on
+    # failure. This is the equivalent of the Python statement "del
+    # o.attr_name".
+
+    object PyObject_GenericGetDict(object o, void *context)
+    # Return value: New reference.
+    # A generic implementation for the getter of a __dict__ descriptor. It
+    # creates the dictionary if necessary.
+    # New in version 3.3.
+
+    int PyObject_GenericSetDict(object o, object value, void *context) except -1
+    # A generic implementation for the setter of a __dict__ descriptor. This
+    # implementation does not allow the dictionary to be deleted.
+    # New in version 3.3.
+
+    int Py_LT, Py_LE, Py_EQ, Py_NE, Py_GT, Py_GE
+
+    object PyObject_RichCompare(object o1, object o2, int opid)
+    # Return value: New reference.
+    # Compare the values of o1 and o2 using the operation specified by
+    # opid, which must be one of Py_LT, Py_LE, Py_EQ, Py_NE, Py_GT, or
+    # Py_GE, corresponding to <, <=, ==, !=, >, or >=
+    # respectively. This is the equivalent of the Python expression
+    # "o1 op o2", where op is the operator corresponding to
+    # opid. Returns the value of the comparison on success, or NULL on
+    # failure.
+
+    bint PyObject_RichCompareBool(object o1, object o2, int opid) except -1
+    # Compare the values of o1 and o2 using the operation specified by
+    # opid, which must be one of Py_LT, Py_LE, Py_EQ, Py_NE, Py_GT, or
+    # Py_GE, corresponding to <, <=, ==, !=, >, or >=
+    # respectively. Returns -1 on error, 0 if the result is false, 1
+    # otherwise. This is the equivalent of the Python expression "o1
+    # op o2", where op is the operator corresponding to opid.
+
+    int PyObject_Cmp(object o1, object o2, int *result) except -1
+    # Compare the values of o1 and o2 using a routine provided by o1,
+    # if one exists, otherwise with a routine provided by o2. The
+    # result of the comparison is returned in result. Returns -1 on
+    # failure. This is the equivalent of the Python statement "result
+    # = cmp(o1, o2)".
+
+    int PyObject_Compare(object o1, object o2) except *
+    # Compare the values of o1 and o2 using a routine provided by o1,
+    # if one exists, otherwise with a routine provided by o2. Returns
+    # the result of the comparison on success. On error, the value
+    # returned is undefined; use PyErr_Occurred() to detect an
+    # error. This is equivalent to the Python expression "cmp(o1,
+    # o2)".
+
+    object PyObject_Repr(object o)
+    # Return value: New reference.
+    # Compute a string representation of object o. Returns the string
+    # representation on success, NULL on failure. This is the
+    # equivalent of the Python expression "repr(o)". Called by the
+    # repr() built-in function and by reverse quotes.
+
+    object PyObject_Str(object o)
+    # Return value: New reference.
+    # Compute a string representation of object o. Returns the string
+    # representation on success, NULL on failure. This is the
+    # equivalent of the Python expression "str(o)". Called by the
+    # str() built-in function and by the print statement.
+
+    object PyObject_Bytes(object o)
+    # Return value: New reference.
+    # Compute a bytes representation of object o. Return NULL on
+    # failure and a bytes object on success. This is equivalent to
+    # the Python expression bytes(o), when o is not an integer.
+    # Unlike bytes(o), a TypeError is raised when o is an integer
+    # instead of a zero-initialized bytes object.
+
+    object PyObject_Unicode(object o)
+    # Return value: New reference.
+    # Compute a Unicode string representation of object o. Returns the
+    # Unicode string representation on success, NULL on failure. This
+    # is the equivalent of the Python expression "unicode(o)". Called
+    # by the unicode() built-in function.
+
+    bint PyObject_IsInstance(object inst, object cls) except -1
+    # Returns 1 if inst is an instance of the class cls or a subclass
+    # of cls, or 0 if not. On error, returns -1 and sets an
+    # exception. If cls is a type object rather than a class object,
+    # PyObject_IsInstance() returns 1 if inst is of type cls. If cls
+    # is a tuple, the check will be done against every entry in
+    # cls. The result will be 1 when at least one of the checks
+    # returns 1, otherwise it will be 0. If inst is not a class
+    # instance and cls is neither a type object, nor a class object,
+    # nor a tuple, inst must have a __class__ attribute -- the class
+    # relationship of the value of that attribute with cls will be
+    # used to determine the result of this function.
+
+    # Subclass determination is done in a fairly straightforward way,
+    # but includes a wrinkle that implementors of extensions to the
+    # class system may want to be aware of. If A and B are class
+    # objects, B is a subclass of A if it inherits from A either
+    # directly or indirectly. If either is not a class object, a more
+    # general mechanism is used to determine the class relationship of
+    # the two objects. When testing if B is a subclass of A, if A is
+    # B, PyObject_IsSubclass() returns true. If A and B are different
+    # objects, B's __bases__ attribute is searched in a depth-first
+    # fashion for A -- the presence of the __bases__ attribute is
+    # considered sufficient for this determination.
+
+    bint PyObject_IsSubclass(object derived, object cls) except -1
+    # Returns 1 if the class derived is identical to or derived from
+    # the class cls, otherwise returns 0. In case of an error, returns
+    # -1. If cls is a tuple, the check will be done against every
+    # entry in cls. The result will be 1 when at least one of the
+    # checks returns 1, otherwise it will be 0. If either derived or
+    # cls is not an actual class object (or tuple), this function uses
+    # the generic algorithm described above. New in version
+    # 2.1. Changed in version 2.3: Older versions of Python did not
+    # support a tuple as the second argument.
+
+    bint PyCallable_Check(object o)
+    # Determine if the object o is callable. Return 1 if the object is
+    # callable and 0 otherwise. This function always succeeds.
+
+    object PyObject_Call(object callable_object, object args, object kw)
+    # Return value: New reference.
+    # Call a callable Python object callable_object, with arguments
+    # given by the tuple args, and named arguments given by the
+    # dictionary kw. If no named arguments are needed, kw may be
+    # NULL. args must not be NULL, use an empty tuple if no arguments
+    # are needed. Returns the result of the call on success, or NULL
+    # on failure. This is the equivalent of the Python expression
+    # "apply(callable_object, args, kw)" or "callable_object(*args,
+    # **kw)".
+
+    object PyObject_CallObject(object callable_object, object args)
+    # Return value: New reference.
+    # Call a callable Python object callable_object, with arguments
+    # given by the tuple args. If no arguments are needed, then args
+    # may be NULL. Returns the result of the call on success, or NULL
+    # on failure. This is the equivalent of the Python expression
+    # "apply(callable_object, args)" or "callable_object(*args)".
+
+    object PyObject_CallFunction(object callable, char *format, ...)
+    # Return value: New reference.
+    # Call a callable Python object callable, with a variable number
+    # of C arguments. The C arguments are described using a
+    # Py_BuildValue() style format string. The format may be NULL,
+    # indicating that no arguments are provided. Returns the result of
+    # the call on success, or NULL on failure. This is the equivalent
+    # of the Python expression "apply(callable, args)" or
+    # "callable(*args)". Note that if you only pass object  args,
+    # PyObject_CallFunctionObjArgs is a faster alternative.
+
+    object PyObject_CallMethod(object o, char *method, char *format, ...)
+    # Return value: New reference.
+    # Call the method named method of object o with a variable number
+    # of C arguments. The C arguments are described by a
+    # Py_BuildValue() format string that should produce a tuple. The
+    # format may be NULL, indicating that no arguments are
+    # provided. Returns the result of the call on success, or NULL on
+    # failure. This is the equivalent of the Python expression
+    # "o.method(args)". Note that if you only pass object  args,
+    # PyObject_CallMethodObjArgs is a faster alternative.
+
+    #object PyObject_CallFunctionObjArgs(object callable, ..., NULL)
+    object PyObject_CallFunctionObjArgs(object callable, ...)
+    # Return value: New reference.
+    # Call a callable Python object callable, with a variable number
+    # of PyObject* arguments. The arguments are provided as a variable
+    # number of parameters followed by NULL. Returns the result of the
+    # call on success, or NULL on failure.
+
+    #PyObject* PyObject_CallMethodObjArgs(object o, object name, ..., NULL)
+    object PyObject_CallMethodObjArgs(object o, object name, ...)
+    # Return value: New reference.
+    # Calls a method of the object o, where the name of the method is
+    # given as a Python string object in name. It is called with a
+    # variable number of PyObject* arguments. The arguments are
+    # provided as a variable number of parameters followed by
+    # NULL. Returns the result of the call on success, or NULL on
+    # failure.
+
+    long PyObject_Hash(object o) except? -1
+    # Compute and return the hash value of an object o. On failure,
+    # return -1. This is the equivalent of the Python expression
+    # "hash(o)".
+
+    bint PyObject_IsTrue(object o) except -1
+    # Returns 1 if the object o is considered to be true, and 0
+    # otherwise. This is equivalent to the Python expression "not not
+    # o". On failure, return -1.
+
+    bint PyObject_Not(object o) except -1
+    # Returns 0 if the object o is considered to be true, and 1
+    # otherwise. This is equivalent to the Python expression "not
+    # o". On failure, return -1.
+
+    object PyObject_Type(object o)
+    # Return value: New reference.
+    # When o is non-NULL, returns a type object corresponding to the
+    # object type of object o. On failure, raises SystemError and
+    # returns NULL. This is equivalent to the Python expression
+    # type(o). This function increments the reference count of the
+    # return value. There's really no reason to use this function
+    # instead of the common expression o->ob_type, which returns a
+    # pointer of type PyTypeObject*, except when the incremented
+    # reference count is needed.
+
+    bint PyObject_TypeCheck(object o, PyTypeObject *type)
+    # Return true if the object o is of type type or a subtype of
+    # type. Both parameters must be non-NULL.
+
+    Py_ssize_t PyObject_Length(object o) except -1
+    Py_ssize_t PyObject_Size(object o) except -1
+    # Return the length of object o. If the object o provides either
+    # the sequence and mapping protocols, the sequence length is
+    # returned. On error, -1 is returned. This is the equivalent to
+    # the Python expression "len(o)".
+
+    Py_ssize_t PyObject_LengthHint(object o, Py_ssize_t default) except -1
+    # Return an estimated length for the object o. First try to return its
+    # actual length, then an estimate using __length_hint__(), and finally
+    # return the default value. On error, return -1. This is the equivalent to
+    # the Python expression "operator.length_hint(o, default)".
+    # New in version 3.4.
+
+    object PyObject_GetItem(object o, object key)
+    # Return value: New reference.
+    # Return element of o corresponding to the object key or NULL on
+    # failure. This is the equivalent of the Python expression
+    # "o[key]".
+
+    int PyObject_SetItem(object o, object key, object v) except -1
+    # Map the object key to the value v. Returns -1 on failure. This
+    # is the equivalent of the Python statement "o[key] = v".
+
+    int PyObject_DelItem(object o, object key) except -1
+    # Delete the mapping for key from o. Returns -1 on failure. This
+    # is the equivalent of the Python statement "del o[key]".
+
+    int PyObject_AsFileDescriptor(object o) except -1
+    # Derives a file-descriptor from a Python object. If the object is
+    # an integer or long integer, its value is returned. If not, the
+    # object's fileno() method is called if it exists; the method must
+    # return an integer or long integer, which is returned as the file
+    # descriptor value. Returns -1 on failure.
+
+    object PyObject_Dir(object o)
+    # Return value: New reference.
+    # This is equivalent to the Python expression "dir(o)", returning
+    # a (possibly empty) list of strings appropriate for the object
+    # argument, or NULL if there was an error. If the argument is
+    # NULL, this is like the Python "dir()", returning the names of
+    # the current locals; in this case, if no execution frame is
+    # active then NULL is returned but PyErr_Occurred() will return
+    # false.
+
+    object PyObject_GetIter(object o)
+    # Return value: New reference.
+    # This is equivalent to the Python expression "iter(o)". It
+    # returns a new iterator for the object argument, or the object
+    # itself if the object is already an iterator. Raises TypeError
+    # and returns NULL if the object cannot be iterated.
+
+    Py_ssize_t Py_SIZE(object o)
+
+    object PyObject_Format(object obj, object format_spec)
+    # Takes an arbitrary object and returns the result of calling
+    # obj.__format__(format_spec).
+    # Added in Py2.6
+
+    # Type flags (tp_flags of PyTypeObject)
+    long Py_TPFLAGS_HAVE_GETCHARBUFFER
+    long Py_TPFLAGS_HAVE_SEQUENCE_IN
+    long Py_TPFLAGS_HAVE_INPLACEOPS
+    long Py_TPFLAGS_CHECKTYPES
+    long Py_TPFLAGS_HAVE_RICHCOMPARE
+    long Py_TPFLAGS_HAVE_WEAKREFS
+    long Py_TPFLAGS_HAVE_ITER
+    long Py_TPFLAGS_HAVE_CLASS
+    long Py_TPFLAGS_HEAPTYPE
+    long Py_TPFLAGS_BASETYPE
+    long Py_TPFLAGS_READY
+    long Py_TPFLAGS_READYING
+    long Py_TPFLAGS_HAVE_GC
+    long Py_TPFLAGS_HAVE_STACKLESS_EXTENSION
+    long Py_TPFLAGS_HAVE_INDEX
+    long Py_TPFLAGS_HAVE_VERSION_TAG
+    long Py_TPFLAGS_VALID_VERSION_TAG
+    long Py_TPFLAGS_IS_ABSTRACT
+    long Py_TPFLAGS_HAVE_NEWBUFFER
+    long Py_TPFLAGS_INT_SUBCLASS
+    long Py_TPFLAGS_LONG_SUBCLASS
+    long Py_TPFLAGS_LIST_SUBCLASS
+    long Py_TPFLAGS_TUPLE_SUBCLASS
+    long Py_TPFLAGS_STRING_SUBCLASS
+    long Py_TPFLAGS_UNICODE_SUBCLASS
+    long Py_TPFLAGS_DICT_SUBCLASS
+    long Py_TPFLAGS_BASE_EXC_SUBCLASS
+    long Py_TPFLAGS_TYPE_SUBCLASS
+    long Py_TPFLAGS_DEFAULT_EXTERNAL
+    long Py_TPFLAGS_DEFAULT_CORE
+    long Py_TPFLAGS_DEFAULT
+    long Py_TPFLAGS_HAVE_FINALIZE
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/oldbuffer.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/oldbuffer.pxd
new file mode 100644
index 00000000000..0222428ed48
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/oldbuffer.pxd
@@ -0,0 +1,63 @@
+# Legacy Python 2 buffer interface.
+#
+# These functions are no longer available in Python 3, use the new
+# buffer interface instead.
+
+cdef extern from "Python.h":
+    cdef enum _:
+        Py_END_OF_BUFFER
+    #    This constant may be passed as the size parameter to
+    #    PyBuffer_FromObject() or PyBuffer_FromReadWriteObject(). It
+    #    indicates that the new PyBufferObject should refer to base object
+    #    from the specified offset to the end of its exported
+    #    buffer. Using this enables the caller to avoid querying the base
+    #    object for its length.
+
+    bint PyBuffer_Check(object p)
+    #    Return true if the argument has type PyBuffer_Type.
+
+    object PyBuffer_FromObject(object base, Py_ssize_t offset, Py_ssize_t size)
+    #    Return value: New reference.
+    #
+    #    Return a new read-only buffer object. This raises TypeError if
+    #    base doesn't support the read-only buffer protocol or doesn't
+    #    provide exactly one buffer segment, or it raises ValueError if
+    #    offset is less than zero. The buffer will hold a reference to the
+    #    base object, and the buffer's contents will refer to the base
+    #    object's buffer interface, starting as position offset and
+    #    extending for size bytes. If size is Py_END_OF_BUFFER, then the
+    #    new buffer's contents extend to the length of the base object's
+    #    exported buffer data.
+
+    object PyBuffer_FromReadWriteObject(object base, Py_ssize_t offset, Py_ssize_t size)
+    #    Return value: New reference.
+    #
+    #    Return a new writable buffer object. Parameters and exceptions
+    #    are similar to those for PyBuffer_FromObject(). If the base
+    #    object does not export the writeable buffer protocol, then
+    #    TypeError is raised.
+
+    object PyBuffer_FromMemory(void *ptr, Py_ssize_t size)
+    #    Return value: New reference.
+    #
+    #    Return a new read-only buffer object that reads from a specified
+    #    location in memory, with a specified size. The caller is
+    #    responsible for ensuring that the memory buffer, passed in as
+    #    ptr, is not deallocated while the returned buffer object
+    #    exists. Raises ValueError if size is less than zero. Note that
+    #    Py_END_OF_BUFFER may not be passed for the size parameter;
+    #    ValueError will be raised in that case.
+
+    object PyBuffer_FromReadWriteMemory(void *ptr, Py_ssize_t size)
+    #    Return value: New reference.
+    #
+    #    Similar to PyBuffer_FromMemory(), but the returned buffer is
+    #    writable.
+
+    object PyBuffer_New(Py_ssize_t size)
+    #    Return value: New reference.
+    #
+    #    Return a new writable buffer object that maintains its own memory
+    #    buffer of size bytes. ValueError is returned if size is not zero
+    #    or positive. Note that the memory buffer (as returned by
+    #    PyObject_AsWriteBuffer()) is not specifically aligned.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/pycapsule.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/pycapsule.pxd
new file mode 100644
index 00000000000..1c21b370b3c
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/pycapsule.pxd
@@ -0,0 +1,143 @@
+
+# available since Python 2.7!
+
+
+cdef extern from "Python.h":
+
+    ctypedef struct PyCapsule_Type
+    # This subtype of PyObject represents an opaque value, useful for
+    # C extension modules who need to pass an opaque value (as a void*
+    # pointer) through Python code to other C code. It is often used
+    # to make a C function pointer defined in one module available to
+    # other modules, so the regular import mechanism can be used to
+    # access C APIs defined in dynamically loaded modules.
+
+
+    ctypedef void (*PyCapsule_Destructor)(object o) noexcept
+    # The type of a destructor callback for a capsule.
+    #
+    # See PyCapsule_New() for the semantics of PyCapsule_Destructor
+    # callbacks.
+
+
+    bint PyCapsule_CheckExact(object o)
+    # Return true if its argument is a PyCapsule.
+
+
+    object PyCapsule_New(void *pointer, const char *name,
+                         PyCapsule_Destructor destructor)
+    # Return value: New reference.
+    #
+    # Create a PyCapsule encapsulating the pointer. The pointer
+    # argument may not be NULL.
+    #
+    # On failure, set an exception and return NULL.
+    #
+    # The name string may either be NULL or a pointer to a valid C
+    # string. If non-NULL, this string must outlive the
+    # capsule. (Though it is permitted to free it inside the
+    # destructor.)
+    #
+    # If the destructor argument is not NULL, it will be called with
+    # the capsule as its argument when it is destroyed.
+    #
+    # If this capsule will be stored as an attribute of a module, the
+    # name should be specified as modulename.attributename. This will
+    # enable other modules to import the capsule using
+    # PyCapsule_Import().
+
+
+    void* PyCapsule_GetPointer(object capsule, const char *name) except? NULL
+    # Retrieve the pointer stored in the capsule. On failure, set an
+    # exception and return NULL.
+    #
+    # The name parameter must compare exactly to the name stored in
+    # the capsule. If the name stored in the capsule is NULL, the name
+    # passed in must also be NULL. Python uses the C function strcmp()
+    # to compare capsule names.
+
+
+    PyCapsule_Destructor PyCapsule_GetDestructor(object capsule) except? NULL
+    # Return the current destructor stored in the capsule. On failure,
+    # set an exception and return NULL.
+    #
+    # It is legal for a capsule to have a NULL destructor. This makes
+    # a NULL return code somewhat ambiguous; use PyCapsule_IsValid()
+    # or PyErr_Occurred() to disambiguate.
+
+
+    const char* PyCapsule_GetName(object capsule) except? NULL
+    # Return the current name stored in the capsule. On failure, set
+    # an exception and return NULL.
+    #
+    # It is legal for a capsule to have a NULL name. This makes a NULL
+    # return code somewhat ambiguous; use PyCapsule_IsValid() or
+    # PyErr_Occurred() to disambiguate.
+
+
+    void* PyCapsule_GetContext(object capsule) except? NULL
+    # Return the current context stored in the capsule. On failure,
+    # set an exception and return NULL.
+    #
+    # It is legal for a capsule to have a NULL context. This makes a
+    # NULL return code somewhat ambiguous; use PyCapsule_IsValid() or
+    # PyErr_Occurred() to disambiguate.
+
+
+    bint PyCapsule_IsValid(object capsule, const char *name)
+    # Determines whether or not capsule is a valid capsule. A valid
+    # capsule is non-NULL, passes PyCapsule_CheckExact(), has a
+    # non-NULL pointer stored in it, and its internal name matches the
+    # name parameter. (See PyCapsule_GetPointer() for information on
+    # how capsule names are compared.)
+    #
+    # In other words, if PyCapsule_IsValid() returns a true value,
+    # calls to any of the accessors (any function starting with
+    # PyCapsule_Get()) are guaranteed to succeed.
+    #
+    # Return a nonzero value if the object is valid and matches the
+    # name passed in. Return 0 otherwise. This function will not fail.
+
+
+    int PyCapsule_SetPointer(object capsule, void *pointer) except -1
+    # Set the void pointer inside capsule to pointer. The pointer may
+    # not be NULL.
+    #
+    # Return 0 on success. Return nonzero and set an exception on
+    # failure.
+
+
+    int PyCapsule_SetDestructor(object capsule, PyCapsule_Destructor destructor) except -1
+    # Set the destructor inside capsule to destructor.
+    #
+    # Return 0 on success. Return nonzero and set an exception on
+    # failure.
+
+
+    int PyCapsule_SetName(object capsule, const char *name) except -1
+    # Set the name inside capsule to name. If non-NULL, the name must
+    # outlive the capsule. If the previous name stored in the capsule
+    # was not NULL, no attempt is made to free it.
+    #
+    # Return 0 on success. Return nonzero and set an exception on
+    # failure.
+
+
+    int PyCapsule_SetContext(object capsule, void *context) except -1
+    # Set the context pointer inside capsule to context.  Return 0 on
+    # success. Return nonzero and set an exception on failure.
+
+
+    void* PyCapsule_Import(const char *name, int no_block) except? NULL
+    # Import a pointer to a C object from a capsule attribute in a
+    # module. The name parameter should specify the full name to the
+    # attribute, as in module.attribute. The name stored in the
+    # capsule must match this string exactly. If no_block is true,
+    # import the module without blocking (using
+    # PyImport_ImportModuleNoBlock()). If no_block is false, import
+    # the module conventionally (using PyImport_ImportModule()).
+    #
+    # Return the capsule’s internal pointer on success. On failure,
+    # set an exception and return NULL. However, if PyCapsule_Import()
+    # failed to import the module, and no_block was true, no exception
+    # is set.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/pyport.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/pyport.pxd
new file mode 100644
index 00000000000..fec59c9c8c4
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/pyport.pxd
@@ -0,0 +1,8 @@
+cdef extern from "Python.h":
+    ctypedef int int32_t
+    ctypedef int int64_t
+    ctypedef unsigned int uint32_t
+    ctypedef unsigned int uint64_t
+
+    const Py_ssize_t PY_SSIZE_T_MIN
+    const Py_ssize_t PY_SSIZE_T_MAX
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/pystate.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/pystate.pxd
new file mode 100644
index 00000000000..ee8856b20ab
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/pystate.pxd
@@ -0,0 +1,95 @@
+# Thread and interpreter state structures and their interfaces
+
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+
+    # We make these an opaque types. If the user wants specific attributes,
+    # they can be declared manually.
+
+    ctypedef long PY_INT64_T  # FIXME: Py2.7+, not defined here but used here
+
+    ctypedef struct PyInterpreterState:
+        pass
+
+    ctypedef struct PyThreadState:
+        pass
+
+    ctypedef struct PyFrameObject:
+        pass
+
+    # This is not actually a struct, but make sure it can never be coerced to
+    # an int or used in arithmetic expressions
+    ctypedef struct PyGILState_STATE:
+        pass
+
+    # The type of the trace function registered using PyEval_SetProfile() and
+    # PyEval_SetTrace().
+    # Py_tracefunc return -1 when raising an exception, or 0 for success.
+    ctypedef int (*Py_tracefunc)(PyObject *, PyFrameObject *, int, PyObject *)
+
+    # The following values are used for 'what' for tracefunc functions
+    enum:
+        PyTrace_CALL
+        PyTrace_EXCEPTION
+        PyTrace_LINE
+        PyTrace_RETURN
+        PyTrace_C_CALL
+        PyTrace_C_EXCEPTION
+        PyTrace_C_RETURN
+
+
+    PyInterpreterState * PyInterpreterState_New()
+    void PyInterpreterState_Clear(PyInterpreterState *)
+    void PyInterpreterState_Delete(PyInterpreterState *)
+    PY_INT64_T PyInterpreterState_GetID(PyInterpreterState *)
+
+    PyThreadState * PyThreadState_New(PyInterpreterState *)
+    void PyThreadState_Clear(PyThreadState *)
+    void PyThreadState_Delete(PyThreadState *)
+
+    PyThreadState * PyThreadState_Get()
+    PyThreadState * PyThreadState_Swap(PyThreadState *)  # NOTE: DO NOT USE IN CYTHON CODE !
+    PyObject * PyThreadState_GetDict()
+    int PyThreadState_SetAsyncExc(long, PyObject *)
+
+    # Ensure that the current thread is ready to call the Python
+    # C API, regardless of the current state of Python, or of its
+    # thread lock.  This may be called as many times as desired
+    # by a thread so long as each call is matched with a call to
+    # PyGILState_Release().  In general, other thread-state APIs may
+    # be used between _Ensure() and _Release() calls, so long as the
+    # thread-state is restored to its previous state before the Release().
+    # For example, normal use of the Py_BEGIN_ALLOW_THREADS/
+    # Py_END_ALLOW_THREADS macros are acceptable.
+
+    # The return value is an opaque "handle" to the thread state when
+    # PyGILState_Ensure() was called, and must be passed to
+    # PyGILState_Release() to ensure Python is left in the same state. Even
+    # though recursive calls are allowed, these handles can *not* be shared -
+    # each unique call to PyGILState_Ensure must save the handle for its
+    # call to PyGILState_Release.
+
+    # When the function returns, the current thread will hold the GIL.
+
+    # Failure is a fatal error.
+    PyGILState_STATE PyGILState_Ensure()
+
+    # Release any resources previously acquired.  After this call, Python's
+    # state will be the same as it was prior to the corresponding
+    # PyGILState_Ensure() call (but generally this state will be unknown to
+    # the caller, hence the use of the GILState API.)
+
+    # Every call to PyGILState_Ensure must be matched by a call to
+    # PyGILState_Release on the same thread.
+    void PyGILState_Release(PyGILState_STATE)
+
+    # Return 1 if the current thread holds the GIL and 0 otherwise.
+    int PyGILState_Check()
+
+    # Routines for advanced debuggers, requested by David Beazley.
+    # Don't use unless you know what you are doing!
+    PyInterpreterState * PyInterpreterState_Head()
+    PyInterpreterState * PyInterpreterState_Next(PyInterpreterState *)
+    PyThreadState * PyInterpreterState_ThreadHead(PyInterpreterState *)
+    PyThreadState * PyThreadState_Next(PyThreadState *)
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/pythread.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/pythread.pxd
new file mode 100644
index 00000000000..392bef7d64b
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/pythread.pxd
@@ -0,0 +1,53 @@
+
+
+cdef extern from "pythread.h":
+
+    ctypedef void *PyThread_type_lock
+    ctypedef void *PyThread_type_sema
+
+    void PyThread_init_thread()
+    long PyThread_start_new_thread(void (*)(void *), void *)  # FIXME: legacy
+    #unsigned long PyThread_start_new_thread(void (*)(void *), void *)  # returned 'long' before Py3.7
+    void PyThread_exit_thread()
+    long PyThread_get_thread_ident()  # FIXME: legacy
+    #unsigned long PyThread_get_thread_ident()  # returned 'long' before Py3.7
+
+    PyThread_type_lock PyThread_allocate_lock()
+    void PyThread_free_lock(PyThread_type_lock)
+    int PyThread_acquire_lock(PyThread_type_lock, int mode) nogil
+    void PyThread_release_lock(PyThread_type_lock) nogil
+
+    enum:
+        # 'mode' in PyThread_acquire_lock()
+        WAIT_LOCK    #   1
+        NOWAIT_LOCK  #   0
+
+    ctypedef enum PyLockStatus:
+        # return values of PyThread_acquire_lock() in CPython 3.2+
+        PY_LOCK_FAILURE = 0
+        PY_LOCK_ACQUIRED = 1
+        PY_LOCK_INTR
+
+    size_t PyThread_get_stacksize()
+    int PyThread_set_stacksize(size_t)
+
+    # Thread Local Storage (TLS) API deprecated in CPython 3.7+
+    int PyThread_create_key()
+    void PyThread_delete_key(int)
+    int PyThread_set_key_value(int, void *)
+    void * PyThread_get_key_value(int)
+    void PyThread_delete_key_value(int key)
+
+    # Cleanup after a fork
+    void PyThread_ReInitTLS()
+
+    # Thread Specific Storage (TSS) API in CPython 3.7+ (also backported)
+    #ctypedef struct Py_tss_t: pass   # Cython built-in type
+    Py_tss_t Py_tss_NEEDS_INIT        # Not normally useful: Cython auto-initialises declared "Py_tss_t" variables.
+    Py_tss_t * PyThread_tss_alloc()
+    void PyThread_tss_free(Py_tss_t *key)
+    int PyThread_tss_is_created(Py_tss_t *key)
+    int PyThread_tss_create(Py_tss_t *key)
+    void PyThread_tss_delete(Py_tss_t *key)
+    int PyThread_tss_set(Py_tss_t *key, void *value)
+    void * PyThread_tss_get(Py_tss_t *key)
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/ref.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/ref.pxd
new file mode 100644
index 00000000000..44f870006a9
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/ref.pxd
@@ -0,0 +1,50 @@
+from .object cimport PyObject, PyTypeObject, Py_TYPE  # legacy imports for re-export
+
+cdef extern from "Python.h":
+    #####################################################################
+    # 3. Reference Counts
+    #####################################################################
+    # The macros in this section are used for managing reference counts of Python objects.
+    void Py_INCREF(object o)
+    # Increment the reference count for object o. The object must not
+    # be NULL; if you aren't sure that it isn't NULL, use
+    # Py_XINCREF().
+
+    void Py_XINCREF(PyObject* o)
+    # Increment the reference count for object o. The object may be NULL, in which case the macro has no effect.
+
+    void Py_DECREF(object o)
+    # Decrement the reference count for object o. The object must not
+    # be NULL; if you aren't sure that it isn't NULL, use
+    # Py_XDECREF(). If the reference count reaches zero, the object's
+    # type's deallocation function (which must not be NULL) is
+    # invoked.
+
+    # Warning: The deallocation function can cause arbitrary Python
+    # code to be invoked (e.g. when a class instance with a __del__()
+    # method is deallocated). While exceptions in such code are not
+    # propagated, the executed code has free access to all Python
+    # global variables. This means that any object that is reachable
+    # from a global variable should be in a consistent state before
+    # Py_DECREF() is invoked. For example, code to delete an object
+    # from a list should copy a reference to the deleted object in a
+    # temporary variable, update the list data structure, and then
+    # call Py_DECREF() for the temporary variable.
+
+    void Py_XDECREF(PyObject* o)
+    # Decrement the reference count for object o. The object may be
+    # NULL, in which case the macro has no effect; otherwise the
+    # effect is the same as for Py_DECREF(), and the same warning
+    # applies.
+
+    void Py_CLEAR(PyObject* o)
+    # Decrement the reference count for object o. The object may be
+    # NULL, in which case the macro has no effect; otherwise the
+    # effect is the same as for Py_DECREF(), except that the argument
+    # is also set to NULL. The warning for Py_DECREF() does not apply
+    # with respect to the object passed because the macro carefully
+    # uses a temporary variable and sets the argument to NULL before
+    # decrementing its reference count.
+    # It is a good idea to use this macro whenever decrementing the
+    # value of a variable that might be traversed during garbage
+    # collection.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/sequence.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/sequence.pxd
new file mode 100644
index 00000000000..e50e4c495ea
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/sequence.pxd
@@ -0,0 +1,134 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+
+    ############################################################################
+    # 6.3 Sequence Protocol
+    ############################################################################
+
+    bint PySequence_Check(object o)
+    # Return 1 if the object provides sequence protocol, and 0
+    # otherwise. This function always succeeds.
+
+    Py_ssize_t PySequence_Size(object o) except -1
+    # Returns the number of objects in sequence o on success, and -1
+    # on failure. For objects that do not provide sequence protocol,
+    # this is equivalent to the Python expression "len(o)".
+
+    Py_ssize_t PySequence_Length(object o) except -1
+    # Alternate name for PySequence_Size().
+
+    object PySequence_Concat(object o1, object o2)
+    # Return value: New reference.
+    # Return the concatenation of o1 and o2 on success, and NULL on
+    # failure. This is the equivalent of the Python expression "o1 +
+    # o2".
+
+    object PySequence_Repeat(object o, Py_ssize_t count)
+    # Return value: New reference.
+    # Return the result of repeating sequence object o count times, or
+    # NULL on failure. This is the equivalent of the Python expression
+    # "o * count".
+
+    object PySequence_InPlaceConcat(object o1, object o2)
+    # Return value: New reference.
+    # Return the concatenation of o1 and o2 on success, and NULL on
+    # failure. The operation is done in-place when o1 supports
+    # it. This is the equivalent of the Python expression "o1 += o2".
+
+    object PySequence_InPlaceRepeat(object o, Py_ssize_t count)
+    # Return value: New reference.
+    # Return the result of repeating sequence object o count times, or
+    # NULL on failure. The operation is done in-place when o supports
+    # it. This is the equivalent of the Python expression "o *=
+    # count".
+
+    object PySequence_GetItem(object o, Py_ssize_t i)
+    # Return value: New reference.
+    # Return the ith element of o, or NULL on failure. This is the
+    # equivalent of the Python expression "o[i]".
+
+    object PySequence_GetSlice(object o, Py_ssize_t i1, Py_ssize_t i2)
+    # Return value: New reference.
+    # Return the slice of sequence object o between i1 and i2, or NULL
+    # on failure. This is the equivalent of the Python expression
+    # "o[i1:i2]".
+
+    int PySequence_SetItem(object o, Py_ssize_t i, object v) except -1
+    # Assign object v to the ith element of o. Returns -1 on
+    # failure. This is the equivalent of the Python statement "o[i] =
+    # v". This function does not steal a reference to v.
+
+    int PySequence_DelItem(object o, Py_ssize_t i) except -1
+    # Delete the ith element of object o. Returns -1 on failure. This
+    # is the equivalent of the Python statement "del o[i]".
+
+    int PySequence_SetSlice(object o, Py_ssize_t i1, Py_ssize_t i2, object v) except -1
+    # Assign the sequence object v to the slice in sequence object o
+    # from i1 to i2. This is the equivalent of the Python statement
+    # "o[i1:i2] = v".
+
+    int PySequence_DelSlice(object o, Py_ssize_t i1, Py_ssize_t i2) except -1
+    # Delete the slice in sequence object o from i1 to i2. Returns -1
+    # on failure. This is the equivalent of the Python statement "del
+    # o[i1:i2]".
+
+    int PySequence_Count(object o, object value) except -1
+    # Return the number of occurrences of value in o, that is, return
+    # the number of keys for which o[key] == value. On failure, return
+    # -1. This is equivalent to the Python expression
+    # "o.count(value)".
+
+    int PySequence_Contains(object o, object value) except -1
+    # Determine if o contains value. If an item in o is equal to
+    # value, return 1, otherwise return 0. On error, return -1. This
+    # is equivalent to the Python expression "value in o".
+
+    Py_ssize_t PySequence_Index(object o, object value) except -1
+    # Return the first index i for which o[i] == value. On error,
+    # return -1. This is equivalent to the Python expression
+    # "o.index(value)".
+
+    object PySequence_List(object o)
+    # Return value: New reference.
+    # Return a list object with the same contents as the arbitrary
+    # sequence o. The returned list is guaranteed to be new.
+
+    object PySequence_Tuple(object o)
+    # Return value: New reference.
+    # Return a tuple object with the same contents as the arbitrary
+    # sequence o or NULL on failure. If o is a tuple, a new reference
+    # will be returned, otherwise a tuple will be constructed with the
+    # appropriate contents. This is equivalent to the Python
+    # expression "tuple(o)".
+
+    object PySequence_Fast(object o, char *m)
+    # Return value: New reference.
+    # Returns the sequence o as a tuple, unless it is already a tuple
+    # or list, in which case o is returned. Use
+    # PySequence_Fast_GET_ITEM() to access the members of the
+    # result. Returns NULL on failure. If the object is not a
+    # sequence, raises TypeError with m as the message text.
+
+    PyObject* PySequence_Fast_GET_ITEM(object o, Py_ssize_t i)
+    # Return value: Borrowed reference.
+    # Return the ith element of o, assuming that o was returned by
+    # PySequence_Fast(), o is not NULL, and that i is within bounds.
+
+    PyObject** PySequence_Fast_ITEMS(object o)
+    # Return the underlying array of PyObject pointers. Assumes that o
+    # was returned by PySequence_Fast() and o is not NULL.
+
+    object PySequence_ITEM(object o, Py_ssize_t i)
+    # Return value: New reference.
+    # Return the ith element of o or NULL on failure. Macro form of
+    # PySequence_GetItem() but without checking that
+    # PySequence_Check(o) is true and without adjustment for negative
+    # indices.
+
+    Py_ssize_t PySequence_Fast_GET_SIZE(object o)
+    # Returns the length of o, assuming that o was returned by
+    # PySequence_Fast() and that o is not NULL. The size can also be
+    # gotten by calling PySequence_Size() on o, but
+    # PySequence_Fast_GET_SIZE() is faster because it can assume o is
+    # a list or tuple.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/set.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/set.pxd
new file mode 100644
index 00000000000..ae31d28ae36
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/set.pxd
@@ -0,0 +1,119 @@
+cdef extern from "Python.h":
+
+    ############################################################################
+    # 7.5.14 Set Objects
+    ############################################################################
+
+    # This section details the public API for set and frozenset
+    # objects. Any functionality not listed below is best accessed
+    # using the either the abstract object protocol (including
+    # PyObject_CallMethod(), PyObject_RichCompareBool(),
+    # PyObject_Hash(), PyObject_Repr(), PyObject_IsTrue(),
+    # PyObject_Print(), and PyObject_GetIter()) or the abstract number
+    # protocol (including PyNumber_Add(), PyNumber_Subtract(),
+    # PyNumber_Or(), PyNumber_Xor(), PyNumber_InPlaceAdd(),
+    # PyNumber_InPlaceSubtract(), PyNumber_InPlaceOr(), and
+    # PyNumber_InPlaceXor()).
+
+    # PySetObject
+    # This subtype of PyObject is used to hold the internal data for
+    # both set and frozenset objects. It is like a PyDictObject in
+    # that it is a fixed size for small sets (much like tuple storage)
+    # and will point to a separate, variable sized block of memory for
+    # medium and large sized sets (much like list storage). None of
+    # the fields of this structure should be considered public and are
+    # subject to change. All access should be done through the
+    # documented API rather than by manipulating the values in the
+    # structure.
+
+    # PyTypeObject PySet_Type
+    # This is an instance of PyTypeObject representing the Python set type.
+
+    # PyTypeObject PyFrozenSet_Type
+    # This is an instance of PyTypeObject representing the Python frozenset type.
+
+    # The following type check macros work on pointers to any Python
+    # object. Likewise, the constructor functions work with any
+    # iterable Python object.
+
+    bint PyAnySet_Check(object p)
+    # Return true if p is a set object, a frozenset object, or an
+    # instance of a subtype.
+
+    bint PyAnySet_CheckExact(object p)
+    # Return true if p is a set object or a frozenset object but not
+    # an instance of a subtype.
+
+    bint PyFrozenSet_Check(object p)
+    # Return true if p is a frozenset object or an instance of a subtype.
+
+    bint PyFrozenSet_CheckExact(object p)
+    # Return true if p is a frozenset object but not an instance of a subtype.
+
+    bint PySet_Check(object p)
+    # Return true if p is a set object or an instance of a subtype.
+
+    object PySet_New(object iterable)
+    # Return value: New reference.
+    # Return a new set containing objects returned by the
+    # iterable. The iterable may be NULL to create a new empty
+    # set. Return the new set on success or NULL on failure. Raise
+    # TypeError if iterable is not actually iterable. The constructor
+    # is also useful for copying a set (c=set(s)).
+
+    object PyFrozenSet_New(object iterable)
+    # Return value: New reference.
+    # Return a new frozenset containing objects returned by the
+    # iterable. The iterable may be NULL to create a new empty
+    # frozenset. Return the new set on success or NULL on
+    # failure. Raise TypeError if iterable is not actually iterable.
+
+
+    # The following functions and macros are available for instances
+    # of set or frozenset or instances of their subtypes.
+
+    Py_ssize_t PySet_Size(object anyset) except -1
+    # Return the length of a set or frozenset object. Equivalent to
+    # "len(anyset)". Raises a PyExc_SystemError if anyset is not a
+    # set, frozenset, or an instance of a subtype.
+
+    Py_ssize_t PySet_GET_SIZE(object anyset)
+    # Macro form of PySet_Size() without error checking.
+
+    bint PySet_Contains(object anyset, object key) except -1
+    # Return 1 if found, 0 if not found, and -1 if an error is
+    # encountered. Unlike the Python __contains__() method, this
+    # function does not automatically convert unhashable sets into
+    # temporary frozensets. Raise a TypeError if the key is
+    # unhashable. Raise PyExc_SystemError if anyset is not a set,
+    # frozenset, or an instance of a subtype.
+
+
+    # The following functions are available for instances of set or
+    # its subtypes but not for instances of frozenset or its subtypes.
+
+    int PySet_Add(object set, object key) except -1
+    # Add key to a set instance. Does not apply to frozenset
+    # instances. Return 0 on success or -1 on failure. Raise a
+    # TypeError if the key is unhashable. Raise a MemoryError if there
+    # is no room to grow. Raise a SystemError if set is an not an
+    # instance of set or its subtype.
+
+    bint PySet_Discard(object set, object key) except -1
+    # Return 1 if found and removed, 0 if not found (no action taken),
+    # and -1 if an error is encountered. Does not raise KeyError for
+    # missing keys. Raise a TypeError if the key is unhashable. Unlike
+    # the Python discard() method, this function does not
+    # automatically convert unhashable sets into temporary
+    # frozensets. Raise PyExc_SystemError if set is an not an instance
+    # of set or its subtype.
+
+    object PySet_Pop(object set)
+    # Return value: New reference.
+    # Return a new reference to an arbitrary object in the set, and
+    # removes the object from the set. Return NULL on failure. Raise
+    # KeyError if the set is empty. Raise a SystemError if set is an
+    # not an instance of set or its subtype.
+
+    int PySet_Clear(object set)
+    # Empty an existing set of all elements.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/string.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/string.pxd
new file mode 100644
index 00000000000..3ba25515fe8
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/string.pxd
@@ -0,0 +1,196 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+    ctypedef struct va_list
+
+    ############################################################################
+    # 7.3.1 String Objects
+    ############################################################################
+
+    # These functions raise TypeError when expecting a string
+    # parameter and are called with a non-string parameter.
+    # PyStringObject
+    # This subtype of PyObject represents a Python string object.
+    # PyTypeObject PyString_Type
+    # This instance of PyTypeObject represents the Python string type;
+    # it is the same object as str and types.StringType in the Python
+    # layer.
+
+    bint PyString_Check(object o)
+    # Return true if the object o is a string object or an instance of
+    # a subtype of the string type.
+
+    bint PyString_CheckExact(object o)
+    # Return true if the object o is a string object, but not an instance of a subtype of the string type.
+
+    object PyString_FromString(char *v)
+    # Return value: New reference.
+    # Return a new string object with the value v on success, and NULL
+    # on failure. The parameter v must not be NULL; it will not be
+    # checked.
+
+    object PyString_FromStringAndSize(char *v, Py_ssize_t len)
+    # Return value: New reference.
+    # Return a new string object with the value v and length len on
+    # success, and NULL on failure. If v is NULL, the contents of the
+    # string are uninitialized.
+
+    object PyString_FromFormat(char *format, ...)
+    # Return value: New reference.
+    # Take a C printf()-style format string and a variable number of
+    # arguments, calculate the size of the resulting Python string and
+    # return a string with the values formatted into it. The variable
+    # arguments must be C types and must correspond exactly to the
+    # format characters in the format string. The following format
+    # characters are allowed:
+    # Format Characters 	Type 	Comment
+    # %% 	n/a 	The literal % character.
+    # %c 	int 	A single character, represented as an C int.
+    # %d 	int 	Exactly equivalent to printf("%d").
+    # %u 	unsigned int 	Exactly equivalent to printf("%u").
+    # %ld 	long 	Exactly equivalent to printf("%ld").
+    # %lu 	unsigned long 	Exactly equivalent to printf("%lu").
+    # %zd 	Py_ssize_t 	Exactly equivalent to printf("%zd").
+    # %zu 	size_t 	Exactly equivalent to printf("%zu").
+    # %i 	int 	Exactly equivalent to printf("%i").
+    # %x 	int 	Exactly equivalent to printf("%x").
+    # %s 	char* 	A null-terminated C character array.
+
+    # %p 	void* 	The hex representation of a C pointer.
+    #    Mostly equivalent to printf("%p") except that it is guaranteed to
+    #    start with the literal 0x regardless of what the platform's printf
+    #    yields.
+    # An unrecognized format character causes all the rest of the
+    # format string to be copied as-is to the result string, and any
+    # extra arguments discarded.
+
+    object PyString_FromFormatV(char *format, va_list vargs)
+    # Return value: New reference.
+    # Identical to PyString_FromFormat() except that it takes exactly two arguments.
+
+    Py_ssize_t PyString_Size(object string) except -1
+    # Return the length of the string in string object string.
+
+    Py_ssize_t PyString_GET_SIZE(object string)
+    # Macro form of PyString_Size() but without error checking.
+
+    char* PyString_AsString(object string) except NULL
+    # Return a NUL-terminated representation of the contents of
+    # string. The pointer refers to the internal buffer of string, not
+    # a copy. The data must not be modified in any way, unless the
+    # string was just created using PyString_FromStringAndSize(NULL,
+    # size). It must not be deallocated. If string is a Unicode
+    # object, this function computes the default encoding of string
+    # and operates on that. If string is not a string object at all,
+    # PyString_AsString() returns NULL and raises TypeError.
+
+    char* PyString_AS_STRING(object string)
+    # Macro form of PyString_AsString() but without error
+    # checking. Only string objects are supported; no Unicode objects
+    # should be passed.
+
+    int PyString_AsStringAndSize(object obj, char **buffer, Py_ssize_t *length) except -1
+    # Return a NULL-terminated representation of the contents of the
+    # object obj through the output variables buffer and length.
+    #
+    # The function accepts both string and Unicode objects as
+    # input. For Unicode objects it returns the default encoded
+    # version of the object. If length is NULL, the resulting buffer
+    # may not contain NUL characters; if it does, the function returns
+    # -1 and a TypeError is raised.
+
+    # The buffer refers to an internal string buffer of obj, not a
+    # copy. The data must not be modified in any way, unless the
+    # string was just created using PyString_FromStringAndSize(NULL,
+    # size). It must not be deallocated. If string is a Unicode
+    # object, this function computes the default encoding of string
+    # and operates on that. If string is not a string object at all,
+    # PyString_AsStringAndSize() returns -1 and raises TypeError.
+
+    void PyString_Concat(PyObject **string, object newpart)
+    # Create a new string object in *string containing the contents of
+    # newpart appended to string; the caller will own the new
+    # reference. The reference to the old value of string will be
+    # stolen. If the new string cannot be created, the old reference
+    # to string will still be discarded and the value of *string will
+    # be set to NULL; the appropriate exception will be set.
+
+    void PyString_ConcatAndDel(PyObject **string, object newpart)
+    # Create a new string object in *string containing the contents of
+    # newpart appended to string. This version decrements the
+    # reference count of newpart.
+
+    int _PyString_Resize(PyObject **string, Py_ssize_t newsize) except -1
+    # A way to resize a string object even though it is
+    # ``immutable''. Only use this to build up a brand new string
+    # object; don't use this if the string may already be known in
+    # other parts of the code. It is an error to call this function if
+    # the refcount on the input string object is not one. Pass the
+    # address of an existing string object as an lvalue (it may be
+    # written into), and the new size desired. On success, *string
+    # holds the resized string object and 0 is returned; the address
+    # in *string may differ from its input value. If the reallocation
+    # fails, the original string object at *string is deallocated,
+    # *string is set to NULL, a memory exception is set, and -1 is
+    # returned.
+
+    object PyString_Format(object format, object args)
+    # Return value: New reference.  Return a new string object from
+    # format and args. Analogous to format % args. The args argument
+    # must be a tuple.
+
+    void PyString_InternInPlace(PyObject **string)
+    # Intern the argument *string in place. The argument must be the
+    # address of a pointer variable pointing to a Python string
+    # object. If there is an existing interned string that is the same
+    # as *string, it sets *string to it (decrementing the reference
+    # count of the old string object and incrementing the reference
+    # count of the interned string object), otherwise it leaves
+    # *string alone and interns it (incrementing its reference
+    # count). (Clarification: even though there is a lot of talk about
+    # reference counts, think of this function as
+    # reference-count-neutral; you own the object after the call if
+    # and only if you owned it before the call.)
+
+    object PyString_InternFromString(char *v)
+    # Return value: New reference.
+    # A combination of PyString_FromString() and
+    # PyString_InternInPlace(), returning either a new string object
+    # that has been interned, or a new (``owned'') reference to an
+    # earlier interned string object with the same value.
+
+    object PyString_Decode(char *s, Py_ssize_t size, char *encoding, char *errors)
+    #  Return value: New reference.
+    # Create an object by decoding size bytes of the encoded buffer s
+    # using the codec registered for encoding. encoding and errors
+    # have the same meaning as the parameters of the same name in the
+    # unicode() built-in function. The codec to be used is looked up
+    # using the Python codec registry. Return NULL if an exception was
+    # raised by the codec.
+
+    object PyString_AsDecodedObject(object str, char *encoding, char *errors)
+    # Return value: New reference.
+    # Decode a string object by passing it to the codec registered for
+    # encoding and return the result as Python object. encoding and
+    # errors have the same meaning as the parameters of the same name
+    # in the string encode() method. The codec to be used is looked up
+    # using the Python codec registry. Return NULL if an exception was
+    # raised by the codec.
+
+    object PyString_Encode(char *s, Py_ssize_t size, char *encoding, char *errors)
+    # Return value: New reference.
+    # Encode the char buffer of the given size by passing it to the
+    # codec registered for encoding and return a Python
+    # object. encoding and errors have the same meaning as the
+    # parameters of the same name in the string encode() method. The
+    # codec to be used is looked up using the Python codec
+    # registry. Return NULL if an exception was raised by the codec.
+
+    object PyString_AsEncodedObject(object str, char *encoding, char *errors)
+    # Return value: New reference.
+    # Encode a string object using the codec registered for encoding
+    # and return the result as Python object. encoding and errors have
+    # the same meaning as the parameters of the same name in the
+    # string encode() method. The codec to be used is looked up using
+    # the Python codec registry. Return NULL if an exception was
+    # raised by the codec.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/tuple.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/tuple.pxd
new file mode 100644
index 00000000000..907033fe453
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/tuple.pxd
@@ -0,0 +1,72 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+
+    ############################################################################
+    # Tuples
+    ############################################################################
+
+    bint PyTuple_Check(object  p)
+    # Return true if p is a tuple object or an instance of a subtype
+    # of the tuple type.
+
+    bint PyTuple_CheckExact(object  p)
+    # Return true if p is a tuple object, but not an instance of a subtype of the tuple type.
+
+    tuple PyTuple_New(Py_ssize_t len)
+    # Return value: New reference.
+    # Return a new tuple object of size len, or NULL on failure.
+
+    tuple PyTuple_Pack(Py_ssize_t n, ...)
+    # Return value: New reference.
+    # Return a new tuple object of size n, or NULL on failure. The
+    # tuple values are initialized to the subsequent n C arguments
+    # pointing to Python objects. "PyTuple_Pack(2, a, b)" is
+    # equivalent to "Py_BuildValue("(OO)", a, b)".
+
+    Py_ssize_t PyTuple_Size(object  p) except -1
+    # Take a pointer to a tuple object, and return the size of that tuple.
+
+    Py_ssize_t PyTuple_GET_SIZE(object  p)
+    # Return the size of the tuple p, which must be non-NULL and point
+    # to a tuple; no error checking is performed.
+
+    PyObject* PyTuple_GetItem(object  p, Py_ssize_t pos) except NULL
+    # Return value: Borrowed reference.
+    # Return the object at position pos in the tuple pointed to by
+    # p. If pos is out of bounds, return NULL and sets an IndexError
+    # exception.
+
+    PyObject* PyTuple_GET_ITEM(object  p, Py_ssize_t pos)
+    # Return value: Borrowed reference.
+    # Like PyTuple_GetItem(), but does no checking of its arguments.
+
+    tuple PyTuple_GetSlice(object  p, Py_ssize_t low, Py_ssize_t high)
+    # Return value: New reference.
+    # Take a slice of the tuple pointed to by p from low to high and return it as a new tuple.
+
+    int PyTuple_SetItem(object  p, Py_ssize_t pos, object  o) except -1
+    # Insert a reference to object o at position pos of the tuple
+    # pointed to by p. Return 0 on success.
+    #
+    # WARNING: This function _steals_ a reference to o.
+
+    void PyTuple_SET_ITEM(object  p, Py_ssize_t pos, object  o)
+    # Like PyTuple_SetItem(), but does no error checking, and should
+    # only be used to fill in brand new tuples.
+    #
+    # WARNING: This function _steals_ a reference to o.
+
+    int _PyTuple_Resize(PyObject **p, Py_ssize_t newsize) except -1
+    # Can be used to resize a tuple. newsize will be the new length of
+    # the tuple. Because tuples are supposed to be immutable, this
+    # should only be used if there is only one reference to the
+    # object. Do not use this if the tuple may already be known to
+    # some other part of the code. The tuple will always grow or
+    # shrink at the end. Think of this as destroying the old tuple and
+    # creating a new one, only more efficiently. Returns 0 on
+    # success. Client code should never assume that the resulting
+    # value of *p will be the same as before calling this function. If
+    # the object referenced by *p is replaced, the original *p is
+    # destroyed. On failure, returns -1 and sets *p to NULL, and
+    # raises MemoryError or SystemError.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/type.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/type.pxd
new file mode 100644
index 00000000000..928a748cd3e
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/type.pxd
@@ -0,0 +1,53 @@
+
+cdef extern from "Python.h":
+    # The C structure of the objects used to describe built-in types.
+
+    ############################################################################
+    # 7.1.1 Type Objects
+    ############################################################################
+
+    ctypedef class __builtin__.type [object PyTypeObject]:
+        pass
+
+    # PyObject* PyType_Type
+    # This is the type object for type objects; it is the same object
+    # as type and types.TypeType in the Python layer.
+
+    bint PyType_Check(object o)
+    # Return true if the object o is a type object, including
+    # instances of types derived from the standard type object. Return
+    # false in all other cases.
+
+    bint PyType_CheckExact(object o)
+    # Return true if the object o is a type object, but not a subtype
+    # of the standard type object. Return false in all other
+    # cases.
+
+    void PyType_Modified(type type)
+    # Invalidate the internal lookup cache for the type and all of its
+    # subtypes. This function must be called after any manual modification
+    # of the attributes or base classes of the type.
+
+    bint PyType_HasFeature(object o, int feature)
+    # Return true if the type object o sets the feature feature. Type
+    # features are denoted by single bit flags.
+
+    bint PyType_IS_GC(object o)
+    # Return true if the type object includes support for the cycle
+    # detector; this tests the type flag Py_TPFLAGS_HAVE_GC.
+
+    bint PyType_IsSubtype(type a, type b)
+    # Return true if a is a subtype of b.
+
+    object PyType_GenericAlloc(object type, Py_ssize_t nitems)
+    # Return value: New reference.
+
+    object PyType_GenericNew(type type, object args, object kwds)
+    # Return value: New reference.
+
+    bint PyType_Ready(type type) except -1
+    # Finalize a type object. This should be called on all type
+    # objects to finish their initialization. This function is
+    # responsible for adding inherited slots from a type's base
+    # class. Return 0 on success, or return -1 and sets an exception
+    # on error.
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/unicode.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/unicode.pxd
new file mode 100644
index 00000000000..c798ae2b644
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/unicode.pxd
@@ -0,0 +1,639 @@
+from libc.stddef cimport wchar_t
+
+cdef extern from *:
+    ctypedef unsigned char Py_UCS1  # uint8_t
+    ctypedef unsigned short Py_UCS2  # uint16_t
+
+    # Return true if the object o is a Unicode object or an instance
+    # of a Unicode subtype. Changed in version 2.2: Allowed subtypes
+    # to be accepted.
+    bint PyUnicode_Check(object o)
+
+    # Return true if the object o is a Unicode object, but not an
+    # instance of a subtype. New in version 2.2.
+    bint PyUnicode_CheckExact(object o)
+
+    # Return the size of the object. o has to be a PyUnicodeObject
+    # (not checked).
+    #
+    # Deprecated since version 3.3, will be removed in version 3.10:
+    # Part of the old-style Unicode API, please migrate to using
+    # PyUnicode_GET_LENGTH().
+    Py_ssize_t PyUnicode_GET_SIZE(object o)
+
+    # Return the length of the Unicode string, in code points. o has
+    # to be a Unicode object in the “canonical” representation (not
+    # checked).
+    #
+    # New in version 3.3.
+    Py_ssize_t PyUnicode_GET_LENGTH(object o)
+
+    Py_UCS1 *PyUnicode_1BYTE_DATA(object o)
+    Py_UCS2 *PyUnicode_2BYTE_DATA(object o)
+    Py_UCS4 *PyUnicode_4BYTE_DATA(object o)
+
+    int PyUnicode_WCHAR_KIND  # Deprecated since Python 3.10, removed in 3.12.
+    int PyUnicode_1BYTE_KIND
+    int PyUnicode_2BYTE_KIND
+    int PyUnicode_4BYTE_KIND
+    void PyUnicode_WRITE(int kind, void *data, Py_ssize_t index, Py_UCS4 value)
+    Py_UCS4 PyUnicode_READ(int kind, void *data, Py_ssize_t index)
+    Py_UCS4 PyUnicode_READ_CHAR(object o, Py_ssize_t index)
+
+    unsigned int PyUnicode_KIND(object o)
+    void *PyUnicode_DATA(object o)
+
+    # Return the size of the object's internal buffer in bytes. o has
+    # to be a PyUnicodeObject (not checked).
+    Py_ssize_t PyUnicode_GET_DATA_SIZE(object o)
+
+    # Return a pointer to the internal Py_UNICODE buffer of the
+    # object. o has to be a PyUnicodeObject (not checked).
+    Py_UNICODE* PyUnicode_AS_UNICODE(object o)
+
+    # Return a pointer to the internal buffer of the object. o has to
+    # be a PyUnicodeObject (not checked).
+    char* PyUnicode_AS_DATA(object o)
+
+    bint PyUnicode_IsIdentifier(object o)
+
+    # Return 1 or 0 depending on whether ch is a whitespace character.
+    bint Py_UNICODE_ISSPACE(Py_UCS4 ch)
+
+    # Return 1 or 0 depending on whether ch is a lowercase character.
+    bint Py_UNICODE_ISLOWER(Py_UCS4 ch)
+
+    # Return 1 or 0 depending on whether ch is an uppercase character.
+    bint Py_UNICODE_ISUPPER(Py_UCS4 ch)
+
+    # Return 1 or 0 depending on whether ch is a titlecase character.
+    bint Py_UNICODE_ISTITLE(Py_UCS4 ch)
+
+    # Return 1 or 0 depending on whether ch is a linebreak character.
+    bint Py_UNICODE_ISLINEBREAK(Py_UCS4 ch)
+
+    # Return 1 or 0 depending on whether ch is a decimal character.
+    bint Py_UNICODE_ISDECIMAL(Py_UCS4 ch)
+
+    # Return 1 or 0 depending on whether ch is a digit character.
+    bint Py_UNICODE_ISDIGIT(Py_UCS4 ch)
+
+    # Return 1 or 0 depending on whether ch is a numeric character.
+    bint Py_UNICODE_ISNUMERIC(Py_UCS4 ch)
+
+    # Return 1 or 0 depending on whether ch is an alphabetic character.
+    bint Py_UNICODE_ISALPHA(Py_UCS4 ch)
+
+    # Return 1 or 0 depending on whether ch is an alphanumeric character.
+    bint Py_UNICODE_ISALNUM(Py_UCS4 ch)
+
+    bint Py_UNICODE_ISPRINTABLE(Py_UCS4 ch)
+
+    # Return the character ch converted to lower case.
+    # Used to return a Py_UNICODE value before Py3.3.
+    Py_UCS4 Py_UNICODE_TOLOWER(Py_UCS4 ch)
+
+    # Return the character ch converted to upper case.
+    # Used to return a Py_UNICODE value before Py3.3.
+    Py_UCS4 Py_UNICODE_TOUPPER(Py_UCS4 ch)
+
+    # Return the character ch converted to title case.
+    # Used to return a Py_UNICODE value before Py3.3.
+    Py_UCS4 Py_UNICODE_TOTITLE(Py_UCS4 ch)
+
+    # Return the character ch converted to a decimal positive
+    # integer. Return -1 if this is not possible. This macro does not
+    # raise exceptions.
+    int Py_UNICODE_TODECIMAL(Py_UCS4 ch)
+
+    # Return the character ch converted to a single digit
+    # integer. Return -1 if this is not possible. This macro does not
+    # raise exceptions.
+    int Py_UNICODE_TODIGIT(Py_UCS4 ch)
+
+    # Return the character ch converted to a double. Return -1.0 if
+    # this is not possible. This macro does not raise exceptions.
+    double Py_UNICODE_TONUMERIC(Py_UCS4 ch)
+
+    # To create Unicode objects and access their basic sequence
+    # properties, use these APIs:
+
+    # Create a Unicode Object from the Py_UNICODE buffer u of the
+    # given size. u may be NULL which causes the contents to be
+    # undefined. It is the user's responsibility to fill in the needed
+    # data. The buffer is copied into the new object. If the buffer is
+    # not NULL, the return value might be a shared object. Therefore,
+    # modification of the resulting Unicode object is only allowed
+    # when u is NULL.
+    unicode PyUnicode_FromUnicode(Py_UNICODE *u, Py_ssize_t size)
+
+    # Similar to PyUnicode_FromUnicode(), but u points to UTF-8 encoded
+    # bytes
+    unicode PyUnicode_FromStringAndSize(const char *u, Py_ssize_t size)
+
+    # Similar to PyUnicode_FromUnicode(), but u points to null-terminated
+    # UTF-8 encoded bytes.  The size is determined with strlen().
+    unicode PyUnicode_FromString(const char *u)
+
+    unicode PyUnicode_New(Py_ssize_t size, Py_UCS4 maxchar)
+    unicode PyUnicode_FromKindAndData(int kind, const void *buffer, Py_ssize_t size)
+    unicode PyUnicode_FromFormat(const char *format, ...)
+    Py_ssize_t PyUnicode_GetLength(object unicode) except -1
+    Py_ssize_t PyUnicode_CopyCharacters(object to, Py_ssize_t to_start, object from_, Py_ssize_t from_start, Py_ssize_t how_many) except -1
+    Py_ssize_t PyUnicode_Fill(object unicode, Py_ssize_t start, Py_ssize_t length, Py_UCS4 fill_char) except -1
+    int PyUnicode_WriteChar(object unicode, Py_ssize_t index, Py_UCS4 character) except -1
+    Py_UCS4 PyUnicode_ReadChar(object unicode, Py_ssize_t index) except -1
+    unicode PyUnicode_Substring(object str, Py_ssize_t start, Py_ssize_t end)
+    Py_UCS4 *PyUnicode_AsUCS4(object u, Py_UCS4 *buffer, Py_ssize_t buflen, int copy_null) except NULL
+    Py_UCS4 *PyUnicode_AsUCS4Copy(object u) except NULL
+
+    # Create a Unicode Object from the given Unicode code point ordinal.
+    #
+    # The ordinal must be in range(0x10000) on narrow Python builds
+    # (UCS2), and range(0x110000) on wide builds (UCS4). A ValueError
+    # is raised in case it is not.
+    unicode PyUnicode_FromOrdinal(int ordinal)
+
+    # Return a read-only pointer to the Unicode object's internal
+    # Py_UNICODE buffer, NULL if unicode is not a Unicode object.
+    Py_UNICODE* PyUnicode_AsUnicode(object o) except NULL
+
+    # Return the length of the Unicode object.
+    Py_ssize_t PyUnicode_GetSize(object o) except -1
+
+    # Coerce an encoded object obj to an Unicode object and return a
+    # reference with incremented refcount.
+    # String and other char buffer compatible objects are decoded
+    # according to the given encoding and using the error handling
+    # defined by errors. Both can be NULL to have the interface use
+    # the default values (see the next section for details).
+    # All other objects, including Unicode objects, cause a TypeError
+    # to be set.
+    object PyUnicode_FromEncodedObject(object o, char *encoding, char *errors)
+
+    # Shortcut for PyUnicode_FromEncodedObject(obj, NULL, "strict")
+    # which is used throughout the interpreter whenever coercion to
+    # Unicode is needed.
+    object PyUnicode_FromObject(object obj)
+
+    # If the platform supports wchar_t and provides a header file
+    # wchar.h, Python can interface directly to this type using the
+    # following functions. Support is optimized if Python's own
+    # Py_UNICODE type is identical to the system's wchar_t.
+
+    # Create a Unicode object from the wchar_t buffer w of the given
+    # size. Return NULL on failure.
+    object PyUnicode_FromWideChar(wchar_t *w, Py_ssize_t size)
+
+    # Copy the Unicode object contents into the wchar_t buffer w.
+    # At most size wchar_t characters are copied (excluding a possibly
+    # trailing null termination character). Return the number of wchar_t
+    # characters copied or -1 in case of an error. Note that the
+    # esulting wchar_t* string may or may not be null-terminated.
+    # It is the responsibility of the caller to make sure that the wchar_t*
+    # string is null-terminated in case this is required by the application.
+    # Also, note that the wchar_t* string might contain null characters,
+    # which would cause the string to be truncated when used with most C functions.
+    Py_ssize_t PyUnicode_AsWideChar(object o, wchar_t *w, Py_ssize_t size) except -1
+
+    # Convert the Unicode object to a wide character string. The output
+    # string always ends with a null character. If size is not NULL,
+    # write the number of wide characters (excluding the trailing null
+    # termination character) into *size. Note that the resulting wchar_t
+    # string might contain null characters, which would cause the string
+    # to be truncated when used with most C functions. If size is NULL and
+    # the wchar_t* string contains null characters a ValueError is raised.
+
+    # Returns a buffer allocated by PyMem_New (use PyMem_Free() to free it)
+    # on success. On error, returns NULL and *size is undefined. Raises a
+    # MemoryError if memory allocation is failed.
+    wchar_t *PyUnicode_AsWideCharString(object o, Py_ssize_t *size) except NULL
+
+# Unicode Methods
+
+    # Concat two strings giving a new Unicode string.
+    # Return value: New reference.
+    unicode PyUnicode_Concat(object left, object right)
+
+    # Split a string giving a list of Unicode strings. If sep is NULL,
+    # splitting will be done at all whitespace substrings. Otherwise,
+    # splits occur at the given separator. At most maxsplit splits will
+    # be done. If negative, no limit is set. Separators are not included
+    # in the resulting list.
+    # Return value: New reference.
+    list PyUnicode_Split(object s, object sep, Py_ssize_t maxsplit)
+
+    # Split a Unicode string at line breaks, returning a list of Unicode
+    # strings. CRLF is considered to be one line break. If keepend is 0,
+    # the Line break characters are not included in the resulting strings.
+    # Return value: New reference.
+    list PyUnicode_Splitlines(object s, bint keepend)
+
+    # Translate a string by applying a character mapping table to it and
+    # return the resulting Unicode object.
+    #
+    # The mapping table must map Unicode ordinal integers to Unicode ordinal
+    # integers or None (causing deletion of the character).
+    #
+    # Mapping tables need only provide the __getitem__() interface;
+    # dictionaries and sequences work well. Unmapped character ordinals (ones
+    # which cause a LookupError) are left untouched and are copied as-is.
+    #
+    # errors has the usual meaning for codecs. It may be NULL which indicates
+    # to use the default error handling.
+    # Return value: New reference.
+    unicode PyUnicode_Translate(object str, object table, const char *errors)
+
+    # Join a sequence of strings using the given separator and return the
+    # resulting Unicode string.
+    # Return value: New reference.
+    unicode PyUnicode_Join(object separator, object seq)
+
+    # Return 1 if substr matches str[start:end] at the given tail end
+    # (direction == -1 means to do a prefix match, direction == 1 a
+    # suffix match), 0 otherwise.
+    # Return -1 if an error occurred.
+    Py_ssize_t PyUnicode_Tailmatch(object str, object substr,
+                                   Py_ssize_t start, Py_ssize_t end, int direction) except -1
+
+    # Return the first position of substr in str[start:end] using the given
+    # direction (direction == 1 means to do a forward search, direction == -1
+    # a backward search). The return value is the index of the first match;
+    # a value of -1 indicates that no match was found, and -2 indicates that an
+    # error occurred and an exception has been set.
+    Py_ssize_t PyUnicode_Find(object str, object substr, Py_ssize_t start, Py_ssize_t end, int direction) except -2
+
+    # Return the first position of the character ch in str[start:end] using
+    # the given direction (direction == 1 means to do a forward search,
+    # direction == -1 a backward search). The return value is the index of
+    # the first match; a value of -1 indicates that no match was found, and
+    # -2 indicates that an error occurred and an exception has been set.
+    # New in version 3.3.
+    Py_ssize_t PyUnicode_FindChar(object str, Py_UCS4 ch, Py_ssize_t start, Py_ssize_t end, int direction) except -2
+
+    # Return the number of non-overlapping occurrences of substr in
+    # str[start:end]. Return -1 if an error occurred.
+    Py_ssize_t PyUnicode_Count(object str, object substr, Py_ssize_t start, Py_ssize_t end) except -1
+
+    # Replace at most maxcount occurrences of substr in str with replstr and
+    # return the resulting Unicode object. maxcount == -1 means replace all
+    # occurrences.
+    # Return value: New reference.
+    unicode PyUnicode_Replace(object str, object substr, object replstr, Py_ssize_t maxcount)
+
+    # Compare two strings and return -1, 0, 1 for less than,
+    # equal, and greater than, respectively.
+    int PyUnicode_Compare(object left, object right) except? -1
+
+    # Compare a unicode object, uni, with string and return -1, 0, 1 for less than,
+    # equal, and greater than, respectively. It is best to pass only ASCII-encoded
+    # strings, but the function interprets the input string as ISO-8859-1 if it
+    # contains non-ASCII characters.
+    int PyUnicode_CompareWithASCIIString(object uni, const char *string)
+
+    # Rich compare two unicode strings and return one of the following:
+    #
+    #    NULL in case an exception was raised
+    #    Py_True or Py_False for successful comparisons
+    #    Py_NotImplemented in case the type combination is unknown
+    #
+    # Note that Py_EQ and Py_NE comparisons can cause a UnicodeWarning in case
+    # the conversion of the arguments to Unicode fails with a UnicodeDecodeError.
+    #
+    # Possible values for op are Py_GT, Py_GE, Py_EQ, Py_NE, Py_LT, and Py_LE.
+    object PyUnicode_RichCompare(object left, object right, int op)
+
+    # Return a new string object from format and args; this is analogous to
+    # format % args.
+    # Return value: New reference.
+    unicode PyUnicode_Format(object format, object args)
+
+    # Check whether element is contained in container and return true or false
+    # accordingly.
+    #
+    # element has to coerce to a one element Unicode string. -1 is returned
+    # if there was an error.
+    int PyUnicode_Contains(object container, object element) except -1
+
+    # Intern the argument *string in place. The argument must be the address
+    # of a pointer variable pointing to a Python unicode string object. If
+    # there is an existing interned string that is the same as *string, it sets
+    # *string to it (decrementing the reference count of the old string object
+    # and incrementing the reference count of the interned string object),
+    # otherwise it leaves *string alone and interns it (incrementing its reference
+    # count). (Clarification: even though there is a lot of talk about reference
+    # counts, think of this function as reference-count-neutral; you own the object
+    # after the call if and only if you owned it before the call.)
+    #void PyUnicode_InternInPlace(PyObject **string)
+
+    # A combination of PyUnicode_FromString() and PyUnicode_InternInPlace(),
+    # returning either a new unicode string object that has been interned, or
+    # a new ("owned") reference to an earlier interned string object with the
+    # same value.
+    unicode PyUnicode_InternFromString(const char *v)
+
+
+# Codecs
+
+    # Create a Unicode object by decoding size bytes of the encoded
+    # string s. encoding and errors have the same meaning as the
+    # parameters of the same name in the unicode() builtin
+    # function. The codec to be used is looked up using the Python
+    # codec registry. Return NULL if an exception was raised by the
+    # codec.
+    object PyUnicode_Decode(char *s, Py_ssize_t size, char *encoding, char *errors)
+
+    # Encode the Py_UNICODE buffer of the given size and return a
+    # Python string object. encoding and errors have the same meaning
+    # as the parameters of the same name in the Unicode encode()
+    # method. The codec to be used is looked up using the Python codec
+    # registry. Return NULL if an exception was raised by the codec.
+    object PyUnicode_Encode(Py_UNICODE *s, Py_ssize_t size,
+                            char *encoding, char *errors)
+
+    # Encode a Unicode object and return the result as Python string
+    # object. encoding and errors have the same meaning as the
+    # parameters of the same name in the Unicode encode() method. The
+    # codec to be used is looked up using the Python codec
+    # registry. Return NULL if an exception was raised by the codec.
+    object PyUnicode_AsEncodedString(object unicode, char *encoding, char *errors)
+
+# These are the UTF-8 codec APIs:
+
+    # Create a Unicode object by decoding size bytes of the UTF-8
+    # encoded string s. Return NULL if an exception was raised by the
+    # codec.
+    unicode PyUnicode_DecodeUTF8(char *s, Py_ssize_t size, char *errors)
+
+    # If consumed is NULL, behave like PyUnicode_DecodeUTF8(). If
+    # consumed is not NULL, trailing incomplete UTF-8 byte sequences
+    # will not be treated as an error. Those bytes will not be decoded
+    # and the number of bytes that have been decoded will be stored in
+    # consumed. New in version 2.4.
+    unicode PyUnicode_DecodeUTF8Stateful(char *s, Py_ssize_t size, char *errors, Py_ssize_t *consumed)
+
+    # Encode the Py_UNICODE buffer of the given size using UTF-8 and
+    # return a Python string object. Return NULL if an exception was
+    # raised by the codec.
+    bytes PyUnicode_EncodeUTF8(Py_UNICODE *s, Py_ssize_t size, char *errors)
+
+    # Encode a Unicode objects using UTF-8 and return the result as Python bytes object. Error handling is ``strict''. Return NULL if an exception was raised by the codec.
+    bytes PyUnicode_AsUTF8String(object unicode)
+
+
+    # Return a pointer to the UTF-8 encoding of the Unicode object,
+    # and store the size of the encoded representation (in bytes) in size.
+    # The size argument can be NULL; in this case no size will be stored.
+    # The returned buffer always has an extra null byte appended
+    # (not included in size), regardless of whether there are any
+    # other null code points.
+
+    # In the case of an error, NULL is returned with an exception set and
+    # no size is stored.
+
+    # This caches the UTF-8 representation of the string in the Unicode
+    # object, and subsequent calls will return a pointer to the same buffer.
+    # The caller is not responsible for deallocating the buffer
+    const char* PyUnicode_AsUTF8AndSize(object unicode, Py_ssize_t *size) except NULL
+
+
+    # As PyUnicode_AsUTF8AndSize(), but does not store the size.
+    const char *PyUnicode_AsUTF8(object unicode) except NULL
+
+# These are the UTF-16 codec APIs:
+
+    # Decode length bytes from a UTF-16 encoded buffer string and
+    # return the corresponding Unicode object. errors (if non-NULL)
+    # defines the error handling. It defaults to ``strict''.
+    #
+    # If byteorder is non-NULL, the decoder starts decoding using the
+    # given byte order:
+    #
+    #   *byteorder == -1: little endian
+    #   *byteorder == 0:  native order
+    #   *byteorder == 1:  big endian
+    #
+    # and then switches if the first two bytes of the input data are a
+    # byte order mark (BOM) and the specified byte order is native
+    # order. This BOM is not copied into the resulting Unicode
+    # string. After completion, *byteorder is set to the current byte
+    # order at the.
+    #
+    # If byteorder is NULL, the codec starts in native order mode.
+    unicode PyUnicode_DecodeUTF16(char *s, Py_ssize_t size, char *errors, int *byteorder)
+
+    # If consumed is NULL, behave like PyUnicode_DecodeUTF16(). If
+    # consumed is not NULL, PyUnicode_DecodeUTF16Stateful() will not
+    # treat trailing incomplete UTF-16 byte sequences (such as an odd
+    # number of bytes or a split surrogate pair) as an error. Those
+    # bytes will not be decoded and the number of bytes that have been
+    # decoded will be stored in consumed. New in version 2.4.
+    unicode PyUnicode_DecodeUTF16Stateful(char *s, Py_ssize_t size, char *errors, int *byteorder, Py_ssize_t *consumed)
+
+    # Return a Python string object holding the UTF-16 encoded value
+    # of the Unicode data in s. If byteorder is not 0, output is
+    # written according to the following byte order:
+    #
+    #   byteorder == -1: little endian
+    #   byteorder == 0:  native byte order (writes a BOM mark)
+    #   byteorder == 1:  big endian
+    #
+    # If byteorder is 0, the output string will always start with the
+    # Unicode BOM mark (U+FEFF). In the other two modes, no BOM mark
+    # is prepended.
+    #
+    # If Py_UNICODE_WIDE is defined, a single Py_UNICODE value may get
+    # represented as a surrogate pair. If it is not defined, each
+    # Py_UNICODE values is interpreted as an UCS-2 character.
+    bytes PyUnicode_EncodeUTF16(Py_UNICODE *s, Py_ssize_t size, char *errors, int byteorder)
+
+    # Return a Python string using the UTF-16 encoding in native byte
+    # order. The string always starts with a BOM mark. Error handling
+    # is ``strict''. Return NULL if an exception was raised by the
+    # codec.
+    bytes PyUnicode_AsUTF16String(object unicode)
+
+# These are the ``Unicode Escape'' codec APIs:
+
+    # Create a Unicode object by decoding size bytes of the
+    # Unicode-Escape encoded string s. Return NULL if an exception was
+    # raised by the codec.
+    object PyUnicode_DecodeUnicodeEscape(char *s, Py_ssize_t size, char *errors)
+
+    # Encode the Py_UNICODE buffer of the given size using
+    # Unicode-Escape and return a Python string object. Return NULL if
+    # an exception was raised by the codec.
+    object PyUnicode_EncodeUnicodeEscape(Py_UNICODE *s, Py_ssize_t size)
+
+    # Encode a Unicode objects using Unicode-Escape and return the
+    # result as Python string object. Error handling is
+    # ``strict''. Return NULL if an exception was raised by the codec.
+    object PyUnicode_AsUnicodeEscapeString(object unicode)
+
+# These are the ``Raw Unicode Escape'' codec APIs:
+
+    # Create a Unicode object by decoding size bytes of the
+    # Raw-Unicode-Escape encoded string s. Return NULL if an exception
+    # was raised by the codec.
+    object PyUnicode_DecodeRawUnicodeEscape(char *s, Py_ssize_t size, char *errors)
+
+    # Encode the Py_UNICODE buffer of the given size using
+    # Raw-Unicode-Escape and return a Python string object. Return
+    # NULL if an exception was raised by the codec.
+    object PyUnicode_EncodeRawUnicodeEscape(Py_UNICODE *s, Py_ssize_t size, char *errors)
+
+    # Encode a Unicode objects using Raw-Unicode-Escape and return the
+    # result as Python string object. Error handling is
+    # ``strict''. Return NULL if an exception was raised by the codec.
+    object PyUnicode_AsRawUnicodeEscapeString(object unicode)
+
+# These are the Latin-1 codec APIs: Latin-1 corresponds to the first 256 Unicode ordinals and only these are accepted by the codecs during encoding.
+
+    # Create a Unicode object by decoding size bytes of the Latin-1
+    # encoded string s. Return NULL if an exception was raised by the
+    # codec.
+    unicode PyUnicode_DecodeLatin1(char *s, Py_ssize_t size, char *errors)
+
+    # Encode the Py_UNICODE buffer of the given size using Latin-1 and
+    # return a Python bytes object. Return NULL if an exception was
+    # raised by the codec.
+    bytes PyUnicode_EncodeLatin1(Py_UNICODE *s, Py_ssize_t size, char *errors)
+
+    # Encode a Unicode objects using Latin-1 and return the result as
+    # Python bytes object. Error handling is ``strict''. Return NULL
+    # if an exception was raised by the codec.
+    bytes PyUnicode_AsLatin1String(object unicode)
+
+# These are the ASCII codec APIs. Only 7-bit ASCII data is
+# accepted. All other codes generate errors.
+
+    # Create a Unicode object by decoding size bytes of the ASCII
+    # encoded string s. Return NULL if an exception was raised by the
+    # codec.
+    unicode PyUnicode_DecodeASCII(char *s, Py_ssize_t size, char *errors)
+
+    # Encode the Py_UNICODE buffer of the given size using ASCII and
+    # return a Python bytes object. Return NULL if an exception was
+    # raised by the codec.
+    bytes PyUnicode_EncodeASCII(Py_UNICODE *s, Py_ssize_t size, char *errors)
+
+    # Encode a Unicode objects using ASCII and return the result as
+    # Python bytes object. Error handling is ``strict''. Return NULL
+    # if an exception was raised by the codec.
+    bytes PyUnicode_AsASCIIString(object o)
+
+# These are the mapping codec APIs:
+#
+# This codec is special in that it can be used to implement many
+# different codecs (and this is in fact what was done to obtain most
+# of the standard codecs included in the encodings package). The codec
+# uses mapping to encode and decode characters.
+#
+# Decoding mappings must map single string characters to single
+# Unicode characters, integers (which are then interpreted as Unicode
+# ordinals) or None (meaning "undefined mapping" and causing an
+# error).
+#
+# Encoding mappings must map single Unicode characters to single
+# string characters, integers (which are then interpreted as Latin-1
+# ordinals) or None (meaning "undefined mapping" and causing an
+# error).
+#
+# The mapping objects provided must only support the __getitem__
+# mapping interface.
+#
+# If a character lookup fails with a LookupError, the character is
+# copied as-is meaning that its ordinal value will be interpreted as
+# Unicode or Latin-1 ordinal resp. Because of this, mappings only need
+# to contain those mappings which map characters to different code
+# points.
+
+    # Create a Unicode object by decoding size bytes of the encoded
+    # string s using the given mapping object. Return NULL if an
+    # exception was raised by the codec. If mapping is NULL latin-1
+    # decoding will be done. Else it can be a dictionary mapping byte
+    # or a unicode string, which is treated as a lookup table. Byte
+    # values greater that the length of the string and U+FFFE
+    # "characters" are treated as "undefined mapping". Changed in
+    # version 2.4: Allowed unicode string as mapping argument.
+    object PyUnicode_DecodeCharmap(char *s, Py_ssize_t size, object mapping, char *errors)
+
+    # Encode the Py_UNICODE buffer of the given size using the given
+    # mapping object and return a Python string object. Return NULL if
+    # an exception was raised by the codec.
+    #
+    # Deprecated since version 3.3, will be removed in version 4.0.
+    object PyUnicode_EncodeCharmap(Py_UNICODE *s, Py_ssize_t size, object mapping, char *errors)
+
+    # Encode a Unicode objects using the given mapping object and
+    # return the result as Python string object. Error handling is
+    # ``strict''. Return NULL if an exception was raised by the codec.
+    object PyUnicode_AsCharmapString(object o, object mapping)
+
+# The following codec API is special in that maps Unicode to Unicode.
+
+    # Translate a Py_UNICODE buffer of the given length by applying a
+    # character mapping table to it and return the resulting Unicode
+    # object. Return NULL when an exception was raised by the codec.
+    #
+    # The mapping table must map Unicode ordinal integers to Unicode
+    # ordinal integers or None (causing deletion of the character).
+    #
+    # Mapping tables need only provide the __getitem__() interface;
+    # dictionaries and sequences work well. Unmapped character
+    # ordinals (ones which cause a LookupError) are left untouched and
+    # are copied as-is.
+    #
+    # Deprecated since version 3.3, will be removed in version 4.0.
+    object PyUnicode_TranslateCharmap(Py_UNICODE *s, Py_ssize_t size,
+                                      object table, char *errors)
+
+# These are the MBCS codec APIs. They are currently only available on
+# Windows and use the Win32 MBCS converters to implement the
+# conversions. Note that MBCS (or DBCS) is a class of encodings, not
+# just one. The target encoding is defined by the user settings on the
+# machine running the codec.
+
+    # Create a Unicode object by decoding size bytes of the MBCS
+    # encoded string s. Return NULL if an exception was raised by the
+    # codec.
+    unicode PyUnicode_DecodeMBCS(char *s, Py_ssize_t size, char *errors)
+
+    # If consumed is NULL, behave like PyUnicode_DecodeMBCS(). If
+    # consumed is not NULL, PyUnicode_DecodeMBCSStateful() will not
+    # decode trailing lead byte and the number of bytes that have been
+    # decoded will be stored in consumed. New in version 2.5.
+    # NOTE: Python 2.x uses 'int' values for 'size' and 'consumed' (changed in 3.0)
+    unicode PyUnicode_DecodeMBCSStateful(char *s, Py_ssize_t size, char *errors, Py_ssize_t *consumed)
+
+    # Encode the Py_UNICODE buffer of the given size using MBCS and
+    # return a Python string object. Return NULL if an exception was
+    # raised by the codec.
+    bytes PyUnicode_EncodeMBCS(Py_UNICODE *s, Py_ssize_t size, char *errors)
+
+    # Encode a Unicode objects using MBCS and return the result as
+    # Python string object. Error handling is ``strict''. Return NULL
+    # if an exception was raised by the codec.
+    bytes PyUnicode_AsMBCSString(object o)
+
+    # Encode the Unicode object using the specified code page and return
+    # a Python bytes object. Return NULL if an exception was raised by the
+    # codec. Use CP_ACP code page to get the MBCS encoder.
+    #
+    # New in version 3.3.
+    bytes PyUnicode_EncodeCodePage(int code_page, object unicode, const char *errors)
+
+
+# Py_UCS4 helpers (new in CPython 3.3)
+
+    # These utility functions work on strings of Py_UCS4 characters and
+    # otherwise behave like the C standard library functions with the same name.
+
+    size_t Py_UCS4_strlen(const Py_UCS4 *u)
+    Py_UCS4* Py_UCS4_strcpy(Py_UCS4 *s1, const Py_UCS4 *s2)
+    Py_UCS4* Py_UCS4_strncpy(Py_UCS4 *s1, const Py_UCS4 *s2, size_t n)
+    Py_UCS4* Py_UCS4_strcat(Py_UCS4 *s1, const Py_UCS4 *s2)
+    int Py_UCS4_strcmp(const Py_UCS4 *s1, const Py_UCS4 *s2)
+    int Py_UCS4_strncmp(const Py_UCS4 *s1, const Py_UCS4 *s2, size_t n)
+    Py_UCS4* Py_UCS4_strchr(const Py_UCS4 *s, Py_UCS4 c)
+    Py_UCS4* Py_UCS4_strrchr(const Py_UCS4 *s, Py_UCS4 c)
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/version.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/version.pxd
new file mode 100644
index 00000000000..ce31b249cf0
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/version.pxd
@@ -0,0 +1,32 @@
+# Python version constants
+#
+# It's better to evaluate these at runtime (i.e. C compile time) using
+#
+#      if PY_MAJOR_VERSION >= 3:
+#           do_stuff_in_Py3_0_and_later()
+#      if PY_VERSION_HEX >= 0x02070000:
+#           do_stuff_in_Py2_7_and_later()
+#
+# than using the IF/DEF statements, which are evaluated at Cython
+# compile time.  This will keep your C code portable.
+
+
+cdef extern from *:
+    # the complete version, e.g. 0x010502B2 == 1.5.2b2
+    int PY_VERSION_HEX
+
+    # the individual sections as plain numbers
+    int PY_MAJOR_VERSION
+    int PY_MINOR_VERSION
+    int PY_MICRO_VERSION
+    int PY_RELEASE_LEVEL
+    int PY_RELEASE_SERIAL
+
+    # Note: PY_RELEASE_LEVEL is one of
+    #    0xA (alpha)
+    #    0xB (beta)
+    #    0xC (release candidate)
+    #    0xF (final)
+
+    char PY_VERSION[]
+    char PY_PATCHLEVEL_REVISION[]
diff --git a/contrib/tools/cython_py2/Cython/Includes/cpython/weakref.pxd b/contrib/tools/cython_py2/Cython/Includes/cpython/weakref.pxd
new file mode 100644
index 00000000000..9c4b50f5644
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/cpython/weakref.pxd
@@ -0,0 +1,42 @@
+from .object cimport PyObject
+
+cdef extern from "Python.h":
+
+    bint PyWeakref_Check(object ob)
+    # Return true if ob is either a reference or proxy object.
+
+    bint PyWeakref_CheckRef(object ob)
+    # Return true if ob is a reference object.
+
+    bint PyWeakref_CheckProxy(ob)
+    # Return true if *ob* is a proxy object.
+
+    object PyWeakref_NewRef(object ob, object callback)
+    # Return a weak reference object for the object ob.  This will
+    # always return a new reference, but is not guaranteed to create a
+    # new object; an existing reference object may be returned.  The
+    # second parameter, callback, can be a callable object that
+    # receives notification when ob is garbage collected; it should
+    # accept a single parameter, which will be the weak reference
+    # object itself. callback may also be None or NULL.  If ob is not
+    # a weakly-referencable object, or if callback is not callable,
+    # None, or NULL, this will return NULL and raise TypeError.
+
+    object PyWeakref_NewProxy(object ob, object callback)
+    # Return a weak reference proxy object for the object ob.  This
+    # will always return a new reference, but is not guaranteed to
+    # create a new object; an existing proxy object may be returned.
+    # The second parameter, callback, can be a callable object that
+    # receives notification when ob is garbage collected; it should
+    # accept a single parameter, which will be the weak reference
+    # object itself. callback may also be None or NULL.  If ob is not
+    # a weakly-referencable object, or if callback is not callable,
+    # None, or NULL, this will return NULL and raise TypeError.
+
+    PyObject* PyWeakref_GetObject(object ref) except NULL
+    # Return the referenced object from a weak reference, ref.  If the
+    # referent is no longer live, returns None.
+
+    PyObject* PyWeakref_GET_OBJECT(object ref)
+    # Similar to PyWeakref_GetObject, but implemented as a macro that
+    # does no error checking.
diff --git a/contrib/tools/cython_py2/Cython/Includes/libc/__init__.pxd b/contrib/tools/cython_py2/Cython/Includes/libc/__init__.pxd
new file mode 100644
index 00000000000..fa81adaff68
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libc/__init__.pxd
@@ -0,0 +1 @@
+# empty file
diff --git a/contrib/tools/cython_py2/Cython/Includes/libc/stddef.pxd b/contrib/tools/cython_py2/Cython/Includes/libc/stddef.pxd
new file mode 100644
index 00000000000..9b0f4c5fd2c
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libc/stddef.pxd
@@ -0,0 +1,9 @@
+# 7.17 Common definitions <stddef.h>
+
+cdef extern from "<stddef.h>":
+
+    ctypedef signed int ptrdiff_t
+
+    ctypedef unsigned int size_t
+
+    ctypedef int wchar_t
diff --git a/contrib/tools/cython_py2/Cython/Includes/libc/stdint.pxd b/contrib/tools/cython_py2/Cython/Includes/libc/stdint.pxd
new file mode 100644
index 00000000000..ced3d46adda
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libc/stdint.pxd
@@ -0,0 +1,105 @@
+# Longness only used for type promotion.
+# Actual compile time size used for conversions.
+
+# 7.18 Integer types <stdint.h>
+cdef extern from "<stdint.h>" nogil:
+
+    # 7.18.1 Integer types
+    # 7.18.1.1 Exact-width integer types
+    ctypedef   signed char  int8_t
+    ctypedef   signed short int16_t
+    ctypedef   signed int   int32_t
+    ctypedef   signed long  int64_t
+    ctypedef unsigned char  uint8_t
+    ctypedef unsigned short uint16_t
+    ctypedef unsigned int   uint32_t
+    ctypedef unsigned long long uint64_t
+    # 7.18.1.2 Minimum-width integer types
+    ctypedef   signed char  int_least8_t
+    ctypedef   signed short int_least16_t
+    ctypedef   signed int   int_least32_t
+    ctypedef   signed long  int_least64_t
+    ctypedef unsigned char  uint_least8_t
+    ctypedef unsigned short uint_least16_t
+    ctypedef unsigned int   uint_least32_t
+    ctypedef unsigned long long uint_least64_t
+    # 7.18.1.3 Fastest minimum-width integer types
+    ctypedef   signed char  int_fast8_t
+    ctypedef   signed short int_fast16_t
+    ctypedef   signed int   int_fast32_t
+    ctypedef   signed long  int_fast64_t
+    ctypedef unsigned char  uint_fast8_t
+    ctypedef unsigned short uint_fast16_t
+    ctypedef unsigned int   uint_fast32_t
+    ctypedef unsigned long long uint_fast64_t
+    # 7.18.1.4 Integer types capable of holding object pointers
+    ctypedef ssize_t intptr_t
+    ctypedef  size_t uintptr_t
+    # 7.18.1.5 Greatest-width integer types
+    ctypedef signed   long long intmax_t
+    ctypedef unsigned long long uintmax_t
+
+    # 7.18.2 Limits of specified-width integer types
+    # 7.18.2.1 Limits of exact-width integer types
+    int8_t   INT8_MIN
+    int16_t  INT16_MIN
+    int32_t  INT32_MIN
+    int64_t  INT64_MIN
+    int8_t   INT8_MAX
+    int16_t  INT16_MAX
+    int32_t  INT32_MAX
+    int64_t  INT64_MAX
+    uint8_t  UINT8_MAX
+    uint16_t UINT16_MAX
+    uint32_t UINT32_MAX
+    uint64_t UINT64_MAX
+    #7.18.2.2 Limits of minimum-width integer types
+    int_least8_t     INT_LEAST8_MIN
+    int_least16_t   INT_LEAST16_MIN
+    int_least32_t   INT_LEAST32_MIN
+    int_least64_t   INT_LEAST64_MIN
+    int_least8_t     INT_LEAST8_MAX
+    int_least16_t   INT_LEAST16_MAX
+    int_least32_t   INT_LEAST32_MAX
+    int_least64_t   INT_LEAST64_MAX
+    uint_least8_t   UINT_LEAST8_MAX
+    uint_least16_t UINT_LEAST16_MAX
+    uint_least32_t UINT_LEAST32_MAX
+    uint_least64_t UINT_LEAST64_MAX
+    #7.18.2.3 Limits of fastest minimum-width integer types
+    int_fast8_t     INT_FAST8_MIN
+    int_fast16_t   INT_FAST16_MIN
+    int_fast32_t   INT_FAST32_MIN
+    int_fast64_t   INT_FAST64_MIN
+    int_fast8_t     INT_FAST8_MAX
+    int_fast16_t   INT_FAST16_MAX
+    int_fast32_t   INT_FAST32_MAX
+    int_fast64_t   INT_FAST64_MAX
+    uint_fast8_t   UINT_FAST8_MAX
+    uint_fast16_t UINT_FAST16_MAX
+    uint_fast32_t UINT_FAST32_MAX
+    uint_fast64_t UINT_FAST64_MAX
+    #7.18.2.4 Limits of integer types capable of holding object pointers
+    enum:  INTPTR_MIN
+    enum:  INTPTR_MAX
+    enum: UINTPTR_MAX
+    # 7.18.2.5 Limits of greatest-width integer types
+    enum:  INTMAX_MAX
+    enum:  INTMAX_MIN
+    enum: UINTMAX_MAX
+
+    # 7.18.3 Limits of other integer types
+    # ptrdiff_t
+    enum: PTRDIFF_MIN
+    enum: PTRDIFF_MAX
+    # sig_atomic_t
+    enum: SIG_ATOMIC_MIN
+    enum: SIG_ATOMIC_MAX
+    # size_t
+    size_t SIZE_MAX
+    # wchar_t
+    enum: WCHAR_MIN
+    enum: WCHAR_MAX
+    # wint_t
+    enum: WINT_MIN
+    enum: WINT_MAX
diff --git a/contrib/tools/cython_py2/Cython/Includes/libc/stdio.pxd b/contrib/tools/cython_py2/Cython/Includes/libc/stdio.pxd
new file mode 100644
index 00000000000..1644a5a0ab0
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libc/stdio.pxd
@@ -0,0 +1,80 @@
+# 7.19 Input/output <stdio.h>
+
+
+# deprecated cimports for backwards compatibility:
+from libc.string cimport const_char, const_void
+
+
+cdef extern from "<stdio.h>" nogil:
+
+    ctypedef struct FILE
+    cdef FILE *stdin
+    cdef FILE *stdout
+    cdef FILE *stderr
+
+    enum: FOPEN_MAX
+    enum: FILENAME_MAX
+    FILE *fopen   (const char *filename, const char  *opentype)
+    FILE *freopen (const char *filename, const char *opentype, FILE *stream)
+    FILE *fdopen  (int fdescriptor, const char *opentype)
+    int  fclose   (FILE *stream)
+    int  remove   (const char *filename)
+    int  rename   (const char *oldname, const char *newname)
+    FILE *tmpfile ()
+
+    int remove (const char *pathname)
+    int rename (const char *oldpath, const char *newpath)
+
+    enum: _IOFBF
+    enum: _IOLBF
+    enum: _IONBF
+    int setvbuf (FILE *stream, char *buf, int mode, size_t size)
+    enum: BUFSIZ
+    void setbuf (FILE *stream, char *buf)
+
+    size_t fread  (void *data, size_t size, size_t count, FILE *stream)
+    size_t fwrite (const void *data, size_t size, size_t count, FILE *stream)
+    int    fflush (FILE *stream)
+
+    enum: EOF
+    void clearerr (FILE *stream)
+    int feof      (FILE *stream)
+    int ferror    (FILE *stream)
+
+    enum: SEEK_SET
+    enum: SEEK_CUR
+    enum: SEEK_END
+    int      fseek  (FILE *stream, long int offset, int whence)
+    void     rewind (FILE *stream)
+    long int ftell  (FILE *stream)
+
+    ctypedef struct fpos_t
+    ctypedef const fpos_t const_fpos_t "const fpos_t"
+    int fgetpos (FILE *stream, fpos_t *position)
+    int fsetpos (FILE *stream, const fpos_t *position)
+
+    int scanf    (const char *template, ...)
+    int sscanf   (const char *s, const char *template, ...)
+    int fscanf   (FILE *stream, const char *template, ...)
+
+    int printf   (const char *template, ...)
+    int sprintf  (char *s, const char *template, ...)
+    int snprintf (char *s, size_t size, const char *template, ...)
+    int fprintf  (FILE *stream, const char *template, ...)
+
+    void perror  (const char *message)
+
+    char *gets  (char *s)
+    char *fgets (char *s, int count, FILE *stream)
+    int getchar ()
+    int fgetc   (FILE *stream)
+    int getc    (FILE *stream)
+    int ungetc  (int c, FILE *stream)
+
+    int puts    (const char *s)
+    int fputs   (const char *s, FILE *stream)
+    int putchar (int c)
+    int fputc   (int c, FILE *stream)
+    int putc    (int c, FILE *stream)
+
+    size_t getline(char **lineptr, size_t *n, FILE *stream)
diff --git a/contrib/tools/cython_py2/Cython/Includes/libc/string.pxd b/contrib/tools/cython_py2/Cython/Includes/libc/string.pxd
new file mode 100644
index 00000000000..e6d96183f20
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libc/string.pxd
@@ -0,0 +1,50 @@
+# 7.21 String handling <string.h>
+
+cdef extern from *:
+    # deprecated backwards compatibility declarations
+    ctypedef const char const_char "const char"
+    ctypedef const signed char const_schar "const signed char"
+    ctypedef const unsigned char const_uchar "const unsigned char"
+    ctypedef const void const_void "const void"
+
+cdef extern from "<string.h>" nogil:
+
+    void *memcpy  (void *pto, const void *pfrom, size_t size)
+    void *memmove (void *pto, const void *pfrom, size_t size)
+    void *memset  (void *block, int c, size_t size)
+    int  memcmp   (const void *a1, const void *a2, size_t size)
+    void *memchr  (const void *block, int c, size_t size)
+
+    void *memchr  (const void *block, int c, size_t size)
+    void *memrchr (const void *block, int c, size_t size)
+
+    size_t strlen   (const char *s)
+    char   *strcpy  (char *pto, const char *pfrom)
+    char   *strncpy (char *pto, const char *pfrom, size_t size)
+    char   *strdup  (const char *s)
+    char   *strndup (const char *s, size_t size)
+    char   *strcat  (char *pto, const char *pfrom)
+    char   *strncat (char *pto, const char *pfrom, size_t size)
+
+    int strcmp (const char *s1, const char *s2)
+    int strcasecmp (const char *s1, const char *s2)
+    int strncmp (const char *s1, const char *s2, size_t size)
+    int strncasecmp (const char *s1, const char *s2, size_t n)
+
+    int    strcoll (const char *s1, const char *s2)
+    size_t strxfrm (char *pto, const char *pfrom, size_t size)
+
+    char *strerror (int errnum)
+
+    char *strchr  (const char *string, int c)
+    char *strrchr (const char *string, int c)
+
+    char *strstr     (const char *haystack, const char *needle)
+    char *strcasestr (const char *haystack, const char *needle)
+
+    size_t strcspn (const char *string, const char *stopset)
+    size_t strspn  (const char *string, const char *set)
+    char * strpbrk (const char *string, const char *stopset)
+
+    char *strtok (char *newstring, const char *delimiters)
+    char *strsep (char **string_ptr, const char *delimiter)
diff --git a/contrib/tools/cython_py2/Cython/Includes/libc/time.pxd b/contrib/tools/cython_py2/Cython/Includes/libc/time.pxd
new file mode 100644
index 00000000000..318212eea91
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libc/time.pxd
@@ -0,0 +1,47 @@
+# https://en.wikipedia.org/wiki/C_date_and_time_functions
+
+from libc.stddef cimport wchar_t
+
+cdef extern from "<time.h>" nogil:
+    ctypedef long clock_t
+    ctypedef long time_t
+
+    enum: CLOCKS_PER_SEC
+    clock_t clock()             # CPU time
+    time_t  time(time_t *)      # wall clock time since Unix epoch
+
+    cdef struct tm:
+        int  tm_sec
+        int  tm_min
+        int  tm_hour
+        int  tm_mday
+        int  tm_mon
+        int  tm_year
+        int  tm_wday
+        int  tm_yday
+        int  tm_isdst
+        # GNU specific extensions
+        #char *tm_zone
+        #long tm_gmtoff
+
+    int     daylight            # global state
+    long    timezone
+    char    *tzname[2]
+    void    tzset()
+
+    char    *asctime(const tm *)
+    char    *asctime_r(const tm *, char *)
+    char    *ctime(const time_t *)
+    char    *ctime_r(const time_t *, char *)
+    double  difftime(time_t, time_t)
+    tm      *getdate(const char *)
+    tm      *gmtime(const time_t *)
+    tm      *gmtime_r(const time_t *, tm *)
+    tm      *localtime(const time_t *)
+    tm      *localtime_r(const time_t *, tm *)
+    time_t  mktime(tm *)
+    size_t  strftime(char *, size_t, const char *, const tm *)
+    size_t  wcsftime(wchar_t *str, size_t cnt, const wchar_t *fmt, tm *time)
+
+    # POSIX not stdC
+    char    *strptime(const char *, const char *, tm *)
diff --git a/contrib/tools/cython_py2/Cython/Includes/libcpp/__init__.pxd b/contrib/tools/cython_py2/Cython/Includes/libcpp/__init__.pxd
new file mode 100644
index 00000000000..111ea25c2f2
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libcpp/__init__.pxd
@@ -0,0 +1,4 @@
+cdef extern from *:
+    ctypedef bint bool
+    ctypedef void* nullptr_t
+    nullptr_t nullptr
diff --git a/contrib/tools/cython_py2/Cython/Includes/libcpp/deque.pxd b/contrib/tools/cython_py2/Cython/Includes/libcpp/deque.pxd
new file mode 100644
index 00000000000..e625318bd00
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libcpp/deque.pxd
@@ -0,0 +1,165 @@
+cdef extern from "<deque>" namespace "std" nogil:
+    cdef cppclass deque[T,ALLOCATOR=*]:
+        ctypedef T value_type
+        ctypedef ALLOCATOR allocator_type
+
+        # these should really be allocator_type.size_type and
+        # allocator_type.difference_type to be true to the C++ definition
+        # but cython doesn't support deferred access on template arguments
+        ctypedef size_t size_type
+        ctypedef ptrdiff_t difference_type
+
+        cppclass const_iterator
+        cppclass iterator:
+            iterator() except +
+            iterator(iterator&) except +
+            value_type& operator*()
+            iterator operator++()
+            iterator operator--()
+            iterator operator++(int)
+            iterator operator--(int)
+            iterator operator+(size_type)
+            iterator operator-(size_type)
+            difference_type operator-(iterator)
+            difference_type operator-(const_iterator)
+            bint operator==(iterator)
+            bint operator==(const_iterator)
+            bint operator!=(iterator)
+            bint operator!=(const_iterator)
+            bint operator<(iterator)
+            bint operator<(const_iterator)
+            bint operator>(iterator)
+            bint operator>(const_iterator)
+            bint operator<=(iterator)
+            bint operator<=(const_iterator)
+            bint operator>=(iterator)
+            bint operator>=(const_iterator)
+        cppclass const_iterator:
+            const_iterator() except +
+            const_iterator(iterator&) except +
+            const_iterator(const_iterator&) except +
+            operator=(iterator&) except +
+            const value_type& operator*()
+            const_iterator operator++()
+            const_iterator operator--()
+            const_iterator operator++(int)
+            const_iterator operator--(int)
+            const_iterator operator+(size_type)
+            const_iterator operator-(size_type)
+            difference_type operator-(iterator)
+            difference_type operator-(const_iterator)
+            bint operator==(iterator)
+            bint operator==(const_iterator)
+            bint operator!=(iterator)
+            bint operator!=(const_iterator)
+            bint operator<(iterator)
+            bint operator<(const_iterator)
+            bint operator>(iterator)
+            bint operator>(const_iterator)
+            bint operator<=(iterator)
+            bint operator<=(const_iterator)
+            bint operator>=(iterator)
+            bint operator>=(const_iterator)
+
+        cppclass const_reverse_iterator
+        cppclass reverse_iterator:
+            reverse_iterator() except +
+            reverse_iterator(reverse_iterator&) except +
+            value_type& operator*()
+            reverse_iterator operator++()
+            reverse_iterator operator--()
+            reverse_iterator operator++(int)
+            reverse_iterator operator--(int)
+            reverse_iterator operator+(size_type)
+            reverse_iterator operator-(size_type)
+            difference_type operator-(iterator)
+            difference_type operator-(const_iterator)
+            bint operator==(reverse_iterator)
+            bint operator==(const_reverse_iterator)
+            bint operator!=(reverse_iterator)
+            bint operator!=(const_reverse_iterator)
+            bint operator<(reverse_iterator)
+            bint operator<(const_reverse_iterator)
+            bint operator>(reverse_iterator)
+            bint operator>(const_reverse_iterator)
+            bint operator<=(reverse_iterator)
+            bint operator<=(const_reverse_iterator)
+            bint operator>=(reverse_iterator)
+            bint operator>=(const_reverse_iterator)
+        cppclass const_reverse_iterator:
+            const_reverse_iterator() except +
+            const_reverse_iterator(reverse_iterator&) except +
+            operator=(reverse_iterator&) except +
+            const value_type& operator*()
+            const_reverse_iterator operator++()
+            const_reverse_iterator operator--()
+            const_reverse_iterator operator++(int)
+            const_reverse_iterator operator--(int)
+            const_reverse_iterator operator+(size_type)
+            const_reverse_iterator operator-(size_type)
+            difference_type operator-(iterator)
+            difference_type operator-(const_iterator)
+            bint operator==(reverse_iterator)
+            bint operator==(const_reverse_iterator)
+            bint operator!=(reverse_iterator)
+            bint operator!=(const_reverse_iterator)
+            bint operator<(reverse_iterator)
+            bint operator<(const_reverse_iterator)
+            bint operator>(reverse_iterator)
+            bint operator>(const_reverse_iterator)
+            bint operator<=(reverse_iterator)
+            bint operator<=(const_reverse_iterator)
+            bint operator>=(reverse_iterator)
+            bint operator>=(const_reverse_iterator)
+
+        deque() except +
+        deque(deque&) except +
+        deque(size_t) except +
+        deque(size_t, T&) except +
+        #deque[InputIt](InputIt, InputIt)
+        T& operator[](size_t)
+        #deque& operator=(deque&)
+        bint operator==(deque&, deque&)
+        bint operator!=(deque&, deque&)
+        bint operator<(deque&, deque&)
+        bint operator>(deque&, deque&)
+        bint operator<=(deque&, deque&)
+        bint operator>=(deque&, deque&)
+        void assign(size_t, T&) except +
+        void assign[InputIt](InputIt, InputIt) except +
+        T& at(size_t) except +
+        T& back()
+        iterator begin()
+        const_iterator const_begin "begin"()
+        const_iterator cbegin()
+        void clear()
+        bint empty()
+        iterator end()
+        const_iterator const_end "end"()
+        const_iterator cend()
+        iterator erase(iterator) except +
+        iterator erase(iterator, iterator) except +
+        T& front()
+        iterator insert(iterator, T&) except +
+        void insert(iterator, size_t, T&) except +
+        void insert[InputIt](iterator, InputIt, InputIt) except +
+        size_t max_size()
+        void pop_back()
+        void pop_front()
+        void push_back(T&) except +
+        void push_front(T&) except +
+        reverse_iterator rbegin()
+        #const_reverse_iterator rbegin()
+        const_reverse_iterator crbegin()
+        reverse_iterator rend()
+        #const_reverse_iterator rend()
+        const_reverse_iterator crend()
+        void resize(size_t) except +
+        void resize(size_t, T&) except +
+        size_t size()
+        void swap(deque&)
+
+        # C++11 methods
+        void shrink_to_fit() except +
+        T& emplace_front(...) except +
+        T& emplace_back(...) except +
diff --git a/contrib/tools/cython_py2/Cython/Includes/libcpp/pair.pxd b/contrib/tools/cython_py2/Cython/Includes/libcpp/pair.pxd
new file mode 100644
index 00000000000..869fe6674d2
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libcpp/pair.pxd
@@ -0,0 +1 @@
+from .utility cimport pair
diff --git a/contrib/tools/cython_py2/Cython/Includes/libcpp/string.pxd b/contrib/tools/cython_py2/Cython/Includes/libcpp/string.pxd
new file mode 100644
index 00000000000..566c748f5f6
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libcpp/string.pxd
@@ -0,0 +1,333 @@
+
+# deprecated cimport for backwards compatibility:
+from libc.string cimport const_char
+
+cdef extern from "<string>" namespace "std::string" nogil:
+    const size_t npos
+
+cdef extern from "<string>" namespace "std" nogil:
+    cdef cppclass string:
+        ctypedef char value_type
+
+        # these should really be allocator_type.size_type and
+        # allocator_type.difference_type to be true to the C++ definition
+        # but cython doesn't support deferred access on template arguments
+        ctypedef size_t size_type
+        ctypedef ptrdiff_t difference_type
+
+        cppclass const_iterator
+        cppclass iterator:
+            iterator() except +
+            iterator(iterator&) except +
+            value_type& operator*()
+            iterator operator++()
+            iterator operator--()
+            iterator operator++(int)
+            iterator operator--(int)
+            iterator operator+(size_type)
+            iterator operator-(size_type)
+            difference_type operator-(iterator)
+            difference_type operator-(const_iterator)
+            bint operator==(iterator)
+            bint operator==(const_iterator)
+            bint operator!=(iterator)
+            bint operator!=(const_iterator)
+            bint operator<(iterator)
+            bint operator<(const_iterator)
+            bint operator>(iterator)
+            bint operator>(const_iterator)
+            bint operator<=(iterator)
+            bint operator<=(const_iterator)
+            bint operator>=(iterator)
+            bint operator>=(const_iterator)
+        cppclass const_iterator:
+            const_iterator() except +
+            const_iterator(iterator&) except +
+            const_iterator(const_iterator&) except +
+            operator=(iterator&) except +
+            const value_type& operator*()
+            const_iterator operator++()
+            const_iterator operator--()
+            const_iterator operator++(int)
+            const_iterator operator--(int)
+            const_iterator operator+(size_type)
+            const_iterator operator-(size_type)
+            difference_type operator-(iterator)
+            difference_type operator-(const_iterator)
+            bint operator==(iterator)
+            bint operator==(const_iterator)
+            bint operator!=(iterator)
+            bint operator!=(const_iterator)
+            bint operator<(iterator)
+            bint operator<(const_iterator)
+            bint operator>(iterator)
+            bint operator>(const_iterator)
+            bint operator<=(iterator)
+            bint operator<=(const_iterator)
+            bint operator>=(iterator)
+            bint operator>=(const_iterator)
+
+        cppclass const_reverse_iterator
+        cppclass reverse_iterator:
+            reverse_iterator() except +
+            reverse_iterator(reverse_iterator&) except +
+            value_type& operator*()
+            reverse_iterator operator++()
+            reverse_iterator operator--()
+            reverse_iterator operator++(int)
+            reverse_iterator operator--(int)
+            reverse_iterator operator+(size_type)
+            reverse_iterator operator-(size_type)
+            difference_type operator-(iterator)
+            difference_type operator-(const_iterator)
+            bint operator==(reverse_iterator)
+            bint operator==(const_reverse_iterator)
+            bint operator!=(reverse_iterator)
+            bint operator!=(const_reverse_iterator)
+            bint operator<(reverse_iterator)
+            bint operator<(const_reverse_iterator)
+            bint operator>(reverse_iterator)
+            bint operator>(const_reverse_iterator)
+            bint operator<=(reverse_iterator)
+            bint operator<=(const_reverse_iterator)
+            bint operator>=(reverse_iterator)
+            bint operator>=(const_reverse_iterator)
+        cppclass const_reverse_iterator:
+            const_reverse_iterator() except +
+            const_reverse_iterator(reverse_iterator&) except +
+            operator=(reverse_iterator&) except +
+            const value_type& operator*()
+            const_reverse_iterator operator++()
+            const_reverse_iterator operator--()
+            const_reverse_iterator operator++(int)
+            const_reverse_iterator operator--(int)
+            const_reverse_iterator operator+(size_type)
+            const_reverse_iterator operator-(size_type)
+            difference_type operator-(iterator)
+            difference_type operator-(const_iterator)
+            bint operator==(reverse_iterator)
+            bint operator==(const_reverse_iterator)
+            bint operator!=(reverse_iterator)
+            bint operator!=(const_reverse_iterator)
+            bint operator<(reverse_iterator)
+            bint operator<(const_reverse_iterator)
+            bint operator>(reverse_iterator)
+            bint operator>(const_reverse_iterator)
+            bint operator<=(reverse_iterator)
+            bint operator<=(const_reverse_iterator)
+            bint operator>=(reverse_iterator)
+            bint operator>=(const_reverse_iterator)
+
+        string() except +
+        string(const string& s) except +
+        string(const string& s, size_t pos) except +
+        string(const string& s, size_t pos, size_t len) except +
+        string(const char* s) except +
+        string(const char* s, size_t n) except +
+        string(size_t n, char c) except +
+        string(iterator first, iterator last) except +
+
+        iterator begin()
+        const_iterator const_begin "begin"()
+        const_iterator cbegin()
+        iterator end()
+        const_iterator const_end "end"()
+        const_iterator cend()
+        reverse_iterator rbegin()
+        const_reverse_iterator const_rbegin "rbegin"()
+        const_reverse_iterator crbegin()
+        reverse_iterator rend()
+        const_reverse_iterator const_rend "rend"()
+        const_reverse_iterator crend()
+
+        const char* c_str()
+        const char* data()
+        size_t size()
+        size_t max_size()
+        size_t length()
+        void resize(size_t) except +
+        void resize(size_t, char) except +
+        void shrink_to_fit() except +
+        void swap(string& other)
+        size_t capacity()
+        void reserve(size_t) except +
+        void clear()
+        bint empty()
+
+        iterator erase(iterator first, iterator last)
+        iterator erase(iterator p)
+        iterator erase(const_iterator first, const_iterator last)
+        iterator erase(const_iterator p)
+        string& erase(size_t pos, size_t len) except +
+        string& erase(size_t pos) except +
+        string& erase() except +
+
+        char& at(size_t pos) except +
+        char& operator[](size_t pos)
+        char& front()
+        char& back()
+        int compare(const string& s)
+        int compare(size_t pos, size_t len, const string& s) except +
+        int compare(size_t pos, size_t len, const string& s, size_t subpos, size_t sublen) except +
+        int compare(const char* s) except +
+        int compare(size_t pos, size_t len, const char* s) except +
+        int compare(size_t pos, size_t len, const char* s , size_t n) except +
+
+        string& append(const string& s) except +
+        string& append(const string& s, size_t subpos, size_t sublen) except +
+        string& append(const char* s) except +
+        string& append(const char* s, size_t n) except +
+        string& append(size_t n, char c) except +
+
+        void push_back(char c) except +
+        void pop_back()
+
+        string& assign(const string& s) except +
+        string& assign(const string& s, size_t subpos, size_t sublen) except +
+        string& assign(const char* s, size_t n) except +
+        string& assign(const char* s) except +
+        string& assign(size_t n, char c) except +
+
+        string& insert(size_t pos, const string& s, size_t subpos, size_t sublen) except +
+        string& insert(size_t pos, const string& s) except +
+        string& insert(size_t pos, const char* s, size_t n) except +
+        string& insert(size_t pos, const char* s) except +
+        string& insert(size_t pos, size_t n, char c) except +
+        void insert(iterator p, size_t n, char c) except +
+        iterator insert(iterator p, char c) except +
+
+        string& replace(size_t pos, size_t len, const string& str) except +
+        string& replace(iterator i1, iterator i2, const string& str) except +
+        string& replace(size_t pos, size_t len, const string& str, size_t subpos, size_t sublen) except +
+        string& replace(size_t pos, size_t len, const char* s) except +
+        string& replace(iterator i1, iterator i2, const char* s) except +
+        string& replace(size_t pos, size_t len, const char* s, size_t n) except +
+        string& replace(iterator i1, iterator i2, const char* s, size_t n) except +
+        string& replace(size_t pos, size_t len, size_t n, char c) except +
+        string& replace(iterator i1, iterator i2, size_t n, char c) except +
+
+        size_t copy(char* s, size_t len, size_t pos) except +
+        size_t copy(char* s, size_t len) except +
+
+        size_t find(const string& s, size_t pos)
+        size_t find(const string& s)
+        size_t find(const char* s, size_t pos, size_t n)
+        size_t find(const char* s, size_t pos)
+        size_t find(const char* s)
+        size_t find(char c, size_t pos)
+        size_t find(char c)
+
+        size_t rfind(const string&, size_t pos)
+        size_t rfind(const string&)
+        size_t rfind(const char* s, size_t pos, size_t n)
+        size_t rfind(const char* s, size_t pos)
+        size_t rfind(const char* s)
+        size_t rfind(char c, size_t pos)
+        size_t rfind(char c)
+
+        size_t find_first_of(const string&, size_t pos)
+        size_t find_first_of(const string&)
+        size_t find_first_of(const char* s, size_t pos, size_t n)
+        size_t find_first_of(const char* s, size_t pos)
+        size_t find_first_of(const char* s)
+        size_t find_first_of(char c, size_t pos)
+        size_t find_first_of(char c)
+
+        size_t find_first_not_of(const string& s, size_t pos)
+        size_t find_first_not_of(const string& s)
+        size_t find_first_not_of(const char* s, size_t pos, size_t n)
+        size_t find_first_not_of(const char* s, size_t pos)
+        size_t find_first_not_of(const char*)
+        size_t find_first_not_of(char c, size_t pos)
+        size_t find_first_not_of(char c)
+
+        size_t find_last_of(const string& s, size_t pos)
+        size_t find_last_of(const string& s)
+        size_t find_last_of(const char* s, size_t pos, size_t n)
+        size_t find_last_of(const char* s, size_t pos)
+        size_t find_last_of(const char* s)
+        size_t find_last_of(char c, size_t pos)
+        size_t find_last_of(char c)
+
+        size_t find_last_not_of(const string& s, size_t pos)
+        size_t find_last_not_of(const string& s)
+        size_t find_last_not_of(const char* s, size_t pos, size_t n)
+        size_t find_last_not_of(const char* s, size_t pos)
+        size_t find_last_not_of(const char* s)
+        size_t find_last_not_of(char c, size_t pos)
+        size_t find_last_not_of(char c)
+
+        string substr(size_t pos, size_t len) except +
+        string substr(size_t pos) except +
+        string substr()
+
+        # C++20
+        bint starts_with(char c) except +
+        bint starts_with(const char* s)
+        bint ends_with(char c) except +
+        bint ends_with(const char* s)
+        # C++23
+        bint contains(char c) except +
+        bint contains(const char* s)
+
+        #string& operator= (const string&)
+        #string& operator= (const char*)
+        #string& operator= (char)
+
+        string operator+ (const string&) except +
+        string operator+ (const char*) except +
+
+        bint operator==(const string&)
+        bint operator==(const char*)
+
+        bint operator!= (const string&)
+        bint operator!= (const char*)
+
+        bint operator< (const string&)
+        bint operator< (const char*)
+
+        bint operator> (const string&)
+        bint operator> (const char*)
+
+        bint operator<= (const string&)
+        bint operator<= (const char*)
+
+        bint operator>= (const string&)
+        bint operator>= (const char*)
+
+
+    string to_string(int val) except +
+    string to_string(long val) except +
+    string to_string(long long val) except +
+    string to_string(unsigned val) except +
+    string to_string(size_t val) except +
+    string to_string(ssize_t val) except +
+    string to_string(unsigned long val) except +
+    string to_string(unsigned long long val) except +
+    string to_string(float val) except +
+    string to_string(double val) except +
+    string to_string(long double val) except +
+
+    int stoi(const string& s, size_t* idx, int base) except +
+    int stoi(const string& s, size_t* idx) except +
+    int stoi(const string& s) except +
+    long stol(const string& s, size_t* idx, int base) except +
+    long stol(const string& s, size_t* idx) except +
+    long stol(const string& s) except +
+    long long stoll(const string& s, size_t* idx, int base) except +
+    long long stoll(const string& s, size_t* idx) except +
+    long long stoll(const string& s) except +
+
+    unsigned long stoul(const string& s, size_t* idx, int base) except +
+    unsigned long stoul(const string& s, size_t* idx) except +
+    unsigned long stoul(const string& s) except +
+    unsigned long long stoull(const string& s, size_t* idx, int base) except +
+    unsigned long long stoull(const string& s, size_t* idx) except +
+    unsigned long long stoull(const string& s) except +
+
+    float stof(const string& s, size_t* idx) except +
+    float stof(const string& s) except +
+    double stod(const string& s, size_t* idx) except +
+    double stod(const string& s) except +
+    long double stold(const string& s, size_t* idx) except +
+    long double stold(const string& s) except +
diff --git a/contrib/tools/cython_py2/Cython/Includes/libcpp/utility.pxd b/contrib/tools/cython_py2/Cython/Includes/libcpp/utility.pxd
new file mode 100644
index 00000000000..e0df69b1661
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/libcpp/utility.pxd
@@ -0,0 +1,30 @@
+cdef extern from "<utility>" namespace "std" nogil:
+    cdef cppclass pair[T, U]:
+        ctypedef T first_type
+        ctypedef U second_type
+        T first
+        U second
+        pair() except +
+        pair(pair&) except +
+        pair(T&, U&) except +
+        bint operator==(pair&, pair&)
+        bint operator!=(pair&, pair&)
+        bint operator<(pair&, pair&)
+        bint operator>(pair&, pair&)
+        bint operator<=(pair&, pair&)
+        bint operator>=(pair&, pair&)
+
+cdef extern from * namespace "cython_std" nogil:
+    """
+    #if __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1600)
+    // move should be defined for these versions of MSVC, but __cplusplus isn't set usefully
+    #include <type_traits>
+
+    namespace cython_std {
+    template <typename T> typename std::remove_reference<T>::type&& move(T& t) noexcept { return std::move(t); }
+    template <typename T> typename std::remove_reference<T>::type&& move(T&& t) noexcept { return std::move(t); }
+    }
+
+    #endif
+    """
+    cdef T move[T](T)
diff --git a/contrib/tools/cython_py2/Cython/Includes/numpy/__init__.pxd b/contrib/tools/cython_py2/Cython/Includes/numpy/__init__.pxd
new file mode 100644
index 00000000000..228aee4cff8
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/numpy/__init__.pxd
@@ -0,0 +1,1057 @@
+# NumPy static imports for Cython
+#
+# NOTE: Do not make incompatible local changes to this file without contacting the NumPy project.
+# This file is maintained by the NumPy project at
+# https://github.com/numpy/numpy/tree/master/numpy
+#
+# If any of the PyArray_* functions are called, import_array must be
+# called first.  This is done automatically by Cython 3.0+ if a call
+# is not detected inside of the module.
+#
+# Author: Dag Sverre Seljebotn
+#
+
+from cpython.ref cimport Py_INCREF
+from cpython.object cimport PyObject, PyTypeObject, PyObject_TypeCheck
+cimport libc.stdio as stdio
+
+
+cdef extern from *:
+    # Leave a marker that the NumPy declarations came from Cython and not from NumPy itself.
+    # See https://github.com/cython/cython/issues/3573
+    """
+    /* Using NumPy API declarations from "Cython/Includes/numpy/" */
+    """
+
+
+cdef extern from "Python.h":
+    ctypedef Py_ssize_t Py_intptr_t
+
+cdef extern from "numpy/arrayobject.h":
+    ctypedef Py_intptr_t npy_intp
+    ctypedef size_t npy_uintp
+
+    cdef enum NPY_TYPES:
+        NPY_BOOL
+        NPY_BYTE
+        NPY_UBYTE
+        NPY_SHORT
+        NPY_USHORT
+        NPY_INT
+        NPY_UINT
+        NPY_LONG
+        NPY_ULONG
+        NPY_LONGLONG
+        NPY_ULONGLONG
+        NPY_FLOAT
+        NPY_DOUBLE
+        NPY_LONGDOUBLE
+        NPY_CFLOAT
+        NPY_CDOUBLE
+        NPY_CLONGDOUBLE
+        NPY_OBJECT
+        NPY_STRING
+        NPY_UNICODE
+        NPY_VOID
+        NPY_DATETIME
+        NPY_TIMEDELTA
+        NPY_NTYPES
+        NPY_NOTYPE
+
+        NPY_INT8
+        NPY_INT16
+        NPY_INT32
+        NPY_INT64
+        NPY_INT128
+        NPY_INT256
+        NPY_UINT8
+        NPY_UINT16
+        NPY_UINT32
+        NPY_UINT64
+        NPY_UINT128
+        NPY_UINT256
+        NPY_FLOAT16
+        NPY_FLOAT32
+        NPY_FLOAT64
+        NPY_FLOAT80
+        NPY_FLOAT96
+        NPY_FLOAT128
+        NPY_FLOAT256
+        NPY_COMPLEX32
+        NPY_COMPLEX64
+        NPY_COMPLEX128
+        NPY_COMPLEX160
+        NPY_COMPLEX192
+        NPY_COMPLEX256
+        NPY_COMPLEX512
+
+        NPY_INTP
+
+    ctypedef enum NPY_ORDER:
+        NPY_ANYORDER
+        NPY_CORDER
+        NPY_FORTRANORDER
+        NPY_KEEPORDER
+
+    ctypedef enum NPY_CASTING:
+        NPY_NO_CASTING
+        NPY_EQUIV_CASTING
+        NPY_SAFE_CASTING
+        NPY_SAME_KIND_CASTING
+        NPY_UNSAFE_CASTING
+
+    ctypedef enum NPY_CLIPMODE:
+        NPY_CLIP
+        NPY_WRAP
+        NPY_RAISE
+
+    ctypedef enum NPY_SCALARKIND:
+        NPY_NOSCALAR,
+        NPY_BOOL_SCALAR,
+        NPY_INTPOS_SCALAR,
+        NPY_INTNEG_SCALAR,
+        NPY_FLOAT_SCALAR,
+        NPY_COMPLEX_SCALAR,
+        NPY_OBJECT_SCALAR
+
+    ctypedef enum NPY_SORTKIND:
+        NPY_QUICKSORT
+        NPY_HEAPSORT
+        NPY_MERGESORT
+
+    ctypedef enum NPY_SEARCHSIDE:
+        NPY_SEARCHLEFT
+        NPY_SEARCHRIGHT
+
+    enum:
+        # DEPRECATED since NumPy 1.7 ! Do not use in new code!
+        NPY_C_CONTIGUOUS
+        NPY_F_CONTIGUOUS
+        NPY_CONTIGUOUS
+        NPY_FORTRAN
+        NPY_OWNDATA
+        NPY_FORCECAST
+        NPY_ENSURECOPY
+        NPY_ENSUREARRAY
+        NPY_ELEMENTSTRIDES
+        NPY_ALIGNED
+        NPY_NOTSWAPPED
+        NPY_WRITEABLE
+        NPY_UPDATEIFCOPY
+        NPY_ARR_HAS_DESCR
+
+        NPY_BEHAVED
+        NPY_BEHAVED_NS
+        NPY_CARRAY
+        NPY_CARRAY_RO
+        NPY_FARRAY
+        NPY_FARRAY_RO
+        NPY_DEFAULT
+
+        NPY_IN_ARRAY
+        NPY_OUT_ARRAY
+        NPY_INOUT_ARRAY
+        NPY_IN_FARRAY
+        NPY_OUT_FARRAY
+        NPY_INOUT_FARRAY
+
+        NPY_UPDATE_ALL
+
+    enum:
+        # Added in NumPy 1.7 to replace the deprecated enums above.
+        NPY_ARRAY_C_CONTIGUOUS
+        NPY_ARRAY_F_CONTIGUOUS
+        NPY_ARRAY_OWNDATA
+        NPY_ARRAY_FORCECAST
+        NPY_ARRAY_ENSURECOPY
+        NPY_ARRAY_ENSUREARRAY
+        NPY_ARRAY_ELEMENTSTRIDES
+        NPY_ARRAY_ALIGNED
+        NPY_ARRAY_NOTSWAPPED
+        NPY_ARRAY_WRITEABLE
+        NPY_ARRAY_UPDATEIFCOPY
+
+        NPY_ARRAY_BEHAVED
+        NPY_ARRAY_BEHAVED_NS
+        NPY_ARRAY_CARRAY
+        NPY_ARRAY_CARRAY_RO
+        NPY_ARRAY_FARRAY
+        NPY_ARRAY_FARRAY_RO
+        NPY_ARRAY_DEFAULT
+
+        NPY_ARRAY_IN_ARRAY
+        NPY_ARRAY_OUT_ARRAY
+        NPY_ARRAY_INOUT_ARRAY
+        NPY_ARRAY_IN_FARRAY
+        NPY_ARRAY_OUT_FARRAY
+        NPY_ARRAY_INOUT_FARRAY
+
+        NPY_ARRAY_UPDATE_ALL
+
+    cdef enum:
+        NPY_MAXDIMS
+
+    npy_intp NPY_MAX_ELSIZE
+
+    ctypedef void (*PyArray_VectorUnaryFunc)(void *, void *, npy_intp, void *,  void *)
+
+    ctypedef struct PyArray_ArrayDescr:
+        # shape is a tuple, but Cython doesn't support "tuple shape"
+        # inside a non-PyObject declaration, so we have to declare it
+        # as just a PyObject*.
+        PyObject* shape
+
+    ctypedef struct PyArray_Descr:
+        pass
+
+    ctypedef class numpy.dtype [object PyArray_Descr, check_size ignore]:
+        # Use PyDataType_* macros when possible, however there are no macros
+        # for accessing some of the fields, so some are defined.
+        cdef PyTypeObject* typeobj
+        cdef char kind
+        cdef char type
+        # Numpy sometimes mutates this without warning (e.g. it'll
+        # sometimes change "|" to "<" in shared dtype objects on
+        # little-endian machines). If this matters to you, use
+        # PyArray_IsNativeByteOrder(dtype.byteorder) instead of
+        # directly accessing this field.
+        cdef char byteorder
+        cdef char flags
+        cdef int type_num
+        cdef int itemsize "elsize"
+        cdef int alignment
+        cdef object fields
+        cdef tuple names
+        # Use PyDataType_HASSUBARRAY to test whether this field is
+        # valid (the pointer can be NULL). Most users should access
+        # this field via the inline helper method PyDataType_SHAPE.
+        cdef PyArray_ArrayDescr* subarray
+
+    ctypedef class numpy.flatiter [object PyArrayIterObject, check_size ignore]:
+        # Use through macros
+        pass
+
+    ctypedef class numpy.broadcast [object PyArrayMultiIterObject, check_size ignore]:
+        # Use through macros
+        pass
+
+    ctypedef struct PyArrayObject:
+        # For use in situations where ndarray can't replace PyArrayObject*,
+        # like PyArrayObject**.
+        pass
+
+    ctypedef class numpy.ndarray [object PyArrayObject, check_size ignore]:
+        cdef __cythonbufferdefaults__ = {"mode": "strided"}
+
+        # NOTE: no field declarations since direct access is deprecated since NumPy 1.7
+        # Instead, we use properties that map to the corresponding C-API functions.
+
+        @property
+        cdef inline PyObject* base(self) nogil:
+            """Returns a borrowed reference to the object owning the data/memory.
+            """
+            return PyArray_BASE(self)
+
+        @property
+        cdef inline dtype descr(self):
+            """Returns an owned reference to the dtype of the array.
+            """
+            return <dtype>PyArray_DESCR(self)
+
+        @property
+        cdef inline int ndim(self) nogil:
+            """Returns the number of dimensions in the array.
+            """
+            return PyArray_NDIM(self)
+
+        @property
+        cdef inline npy_intp *shape(self) nogil:
+            """Returns a pointer to the dimensions/shape of the array.
+            The number of elements matches the number of dimensions of the array (ndim).
+            Can return NULL for 0-dimensional arrays.
+            """
+            return PyArray_DIMS(self)
+
+        @property
+        cdef inline npy_intp *strides(self) nogil:
+            """Returns a pointer to the strides of the array.
+            The number of elements matches the number of dimensions of the array (ndim).
+            """
+            return PyArray_STRIDES(self)
+
+        @property
+        cdef inline npy_intp size(self) nogil:
+            """Returns the total size (in number of elements) of the array.
+            """
+            return PyArray_SIZE(self)
+
+        @property
+        cdef inline char* data(self) nogil:
+            """The pointer to the data buffer as a char*.
+            This is provided for legacy reasons to avoid direct struct field access.
+            For new code that needs this access, you probably want to cast the result
+            of `PyArray_DATA()` instead, which returns a 'void*'.
+            """
+            return PyArray_BYTES(self)
+
+    ctypedef unsigned char      npy_bool
+
+    ctypedef signed char      npy_byte
+    ctypedef signed short     npy_short
+    ctypedef signed int       npy_int
+    ctypedef signed long      npy_long
+    ctypedef signed long long npy_longlong
+
+    ctypedef unsigned char      npy_ubyte
+    ctypedef unsigned short     npy_ushort
+    ctypedef unsigned int       npy_uint
+    ctypedef unsigned long      npy_ulong
+    ctypedef unsigned long long npy_ulonglong
+
+    ctypedef float        npy_float
+    ctypedef double       npy_double
+    ctypedef long double  npy_longdouble
+
+    ctypedef signed char        npy_int8
+    ctypedef signed short       npy_int16
+    ctypedef signed int         npy_int32
+    ctypedef signed long long   npy_int64
+    ctypedef signed long long   npy_int96
+    ctypedef signed long long   npy_int128
+
+    ctypedef unsigned char      npy_uint8
+    ctypedef unsigned short     npy_uint16
+    ctypedef unsigned int       npy_uint32
+    ctypedef unsigned long long npy_uint64
+    ctypedef unsigned long long npy_uint96
+    ctypedef unsigned long long npy_uint128
+
+    ctypedef float        npy_float32
+    ctypedef double       npy_float64
+    ctypedef long double  npy_float80
+    ctypedef long double  npy_float96
+    ctypedef long double  npy_float128
+
+    ctypedef struct npy_cfloat:
+        double real
+        double imag
+
+    ctypedef struct npy_cdouble:
+        double real
+        double imag
+
+    ctypedef struct npy_clongdouble:
+        long double real
+        long double imag
+
+    ctypedef struct npy_complex64:
+        float real
+        float imag
+
+    ctypedef struct npy_complex128:
+        double real
+        double imag
+
+    ctypedef struct npy_complex160:
+        long double real
+        long double imag
+
+    ctypedef struct npy_complex192:
+        long double real
+        long double imag
+
+    ctypedef struct npy_complex256:
+        long double real
+        long double imag
+
+    ctypedef struct PyArray_Dims:
+        npy_intp *ptr
+        int len
+
+    int _import_array() except -1
+    # A second definition so _import_array isn't marked as used when we use it here.
+    # Do not use - subject to change any time.
+    int __pyx_import_array "_import_array"() except -1
+
+    #
+    # Macros from ndarrayobject.h
+    #
+    bint PyArray_CHKFLAGS(ndarray m, int flags) nogil
+    bint PyArray_IS_C_CONTIGUOUS(ndarray arr) nogil
+    bint PyArray_IS_F_CONTIGUOUS(ndarray arr) nogil
+    bint PyArray_ISCONTIGUOUS(ndarray m) nogil
+    bint PyArray_ISWRITEABLE(ndarray m) nogil
+    bint PyArray_ISALIGNED(ndarray m) nogil
+
+    int PyArray_NDIM(ndarray) nogil
+    bint PyArray_ISONESEGMENT(ndarray) nogil
+    bint PyArray_ISFORTRAN(ndarray) nogil
+    int PyArray_FORTRANIF(ndarray) nogil
+
+    void* PyArray_DATA(ndarray) nogil
+    char* PyArray_BYTES(ndarray) nogil
+
+    npy_intp* PyArray_DIMS(ndarray) nogil
+    npy_intp* PyArray_STRIDES(ndarray) nogil
+    npy_intp PyArray_DIM(ndarray, size_t) nogil
+    npy_intp PyArray_STRIDE(ndarray, size_t) nogil
+
+    PyObject *PyArray_BASE(ndarray) nogil  # returns borrowed reference!
+    PyArray_Descr *PyArray_DESCR(ndarray) nogil  # returns borrowed reference to dtype!
+    PyArray_Descr *PyArray_DTYPE(ndarray) nogil  # returns borrowed reference to dtype! NP 1.7+ alias for descr.
+    int PyArray_FLAGS(ndarray) nogil
+    void PyArray_CLEARFLAGS(ndarray, int flags) nogil  # Added in NumPy 1.7
+    void PyArray_ENABLEFLAGS(ndarray, int flags) nogil  # Added in NumPy 1.7
+    npy_intp PyArray_ITEMSIZE(ndarray) nogil
+    int PyArray_TYPE(ndarray arr) nogil
+
+    object PyArray_GETITEM(ndarray arr, void *itemptr)
+    int PyArray_SETITEM(ndarray arr, void *itemptr, object obj)
+
+    bint PyTypeNum_ISBOOL(int) nogil
+    bint PyTypeNum_ISUNSIGNED(int) nogil
+    bint PyTypeNum_ISSIGNED(int) nogil
+    bint PyTypeNum_ISINTEGER(int) nogil
+    bint PyTypeNum_ISFLOAT(int) nogil
+    bint PyTypeNum_ISNUMBER(int) nogil
+    bint PyTypeNum_ISSTRING(int) nogil
+    bint PyTypeNum_ISCOMPLEX(int) nogil
+    bint PyTypeNum_ISPYTHON(int) nogil
+    bint PyTypeNum_ISFLEXIBLE(int) nogil
+    bint PyTypeNum_ISUSERDEF(int) nogil
+    bint PyTypeNum_ISEXTENDED(int) nogil
+    bint PyTypeNum_ISOBJECT(int) nogil
+
+    bint PyDataType_ISBOOL(dtype) nogil
+    bint PyDataType_ISUNSIGNED(dtype) nogil
+    bint PyDataType_ISSIGNED(dtype) nogil
+    bint PyDataType_ISINTEGER(dtype) nogil
+    bint PyDataType_ISFLOAT(dtype) nogil
+    bint PyDataType_ISNUMBER(dtype) nogil
+    bint PyDataType_ISSTRING(dtype) nogil
+    bint PyDataType_ISCOMPLEX(dtype) nogil
+    bint PyDataType_ISPYTHON(dtype) nogil
+    bint PyDataType_ISFLEXIBLE(dtype) nogil
+    bint PyDataType_ISUSERDEF(dtype) nogil
+    bint PyDataType_ISEXTENDED(dtype) nogil
+    bint PyDataType_ISOBJECT(dtype) nogil
+    bint PyDataType_HASFIELDS(dtype) nogil
+    bint PyDataType_HASSUBARRAY(dtype) nogil
+
+    bint PyArray_ISBOOL(ndarray) nogil
+    bint PyArray_ISUNSIGNED(ndarray) nogil
+    bint PyArray_ISSIGNED(ndarray) nogil
+    bint PyArray_ISINTEGER(ndarray) nogil
+    bint PyArray_ISFLOAT(ndarray) nogil
+    bint PyArray_ISNUMBER(ndarray) nogil
+    bint PyArray_ISSTRING(ndarray) nogil
+    bint PyArray_ISCOMPLEX(ndarray) nogil
+    bint PyArray_ISPYTHON(ndarray) nogil
+    bint PyArray_ISFLEXIBLE(ndarray) nogil
+    bint PyArray_ISUSERDEF(ndarray) nogil
+    bint PyArray_ISEXTENDED(ndarray) nogil
+    bint PyArray_ISOBJECT(ndarray) nogil
+    bint PyArray_HASFIELDS(ndarray) nogil
+
+    bint PyArray_ISVARIABLE(ndarray) nogil
+
+    bint PyArray_SAFEALIGNEDCOPY(ndarray) nogil
+    bint PyArray_ISNBO(char) nogil              # works on ndarray.byteorder
+    bint PyArray_IsNativeByteOrder(char) nogil  # works on ndarray.byteorder
+    bint PyArray_ISNOTSWAPPED(ndarray) nogil
+    bint PyArray_ISBYTESWAPPED(ndarray) nogil
+
+    bint PyArray_FLAGSWAP(ndarray, int) nogil
+
+    bint PyArray_ISCARRAY(ndarray) nogil
+    bint PyArray_ISCARRAY_RO(ndarray) nogil
+    bint PyArray_ISFARRAY(ndarray) nogil
+    bint PyArray_ISFARRAY_RO(ndarray) nogil
+    bint PyArray_ISBEHAVED(ndarray) nogil
+    bint PyArray_ISBEHAVED_RO(ndarray) nogil
+
+
+    bint PyDataType_ISNOTSWAPPED(dtype) nogil
+    bint PyDataType_ISBYTESWAPPED(dtype) nogil
+
+    bint PyArray_DescrCheck(object)
+
+    bint PyArray_Check(object)
+    bint PyArray_CheckExact(object)
+
+    # Cannot be supported due to out arg:
+    # bint PyArray_HasArrayInterfaceType(object, dtype, object, object&)
+    # bint PyArray_HasArrayInterface(op, out)
+
+
+    bint PyArray_IsZeroDim(object)
+    # Cannot be supported due to ## ## in macro:
+    # bint PyArray_IsScalar(object, verbatim work)
+    bint PyArray_CheckScalar(object)
+    bint PyArray_IsPythonNumber(object)
+    bint PyArray_IsPythonScalar(object)
+    bint PyArray_IsAnyScalar(object)
+    bint PyArray_CheckAnyScalar(object)
+
+    ndarray PyArray_GETCONTIGUOUS(ndarray)
+    bint PyArray_SAMESHAPE(ndarray, ndarray) nogil
+    npy_intp PyArray_SIZE(ndarray) nogil
+    npy_intp PyArray_NBYTES(ndarray) nogil
+
+    object PyArray_FROM_O(object)
+    object PyArray_FROM_OF(object m, int flags)
+    object PyArray_FROM_OT(object m, int type)
+    object PyArray_FROM_OTF(object m, int type, int flags)
+    object PyArray_FROMANY(object m, int type, int min, int max, int flags)
+    object PyArray_ZEROS(int nd, npy_intp* dims, int type, int fortran)
+    object PyArray_EMPTY(int nd, npy_intp* dims, int type, int fortran)
+    void PyArray_FILLWBYTE(object, int val)
+    npy_intp PyArray_REFCOUNT(object)
+    object PyArray_ContiguousFromAny(op, int, int min_depth, int max_depth)
+    unsigned char PyArray_EquivArrTypes(ndarray a1, ndarray a2)
+    bint PyArray_EquivByteorders(int b1, int b2) nogil
+    object PyArray_SimpleNew(int nd, npy_intp* dims, int typenum)
+    object PyArray_SimpleNewFromData(int nd, npy_intp* dims, int typenum, void* data)
+    #object PyArray_SimpleNewFromDescr(int nd, npy_intp* dims, dtype descr)
+    object PyArray_ToScalar(void* data, ndarray arr)
+
+    void* PyArray_GETPTR1(ndarray m, npy_intp i) nogil
+    void* PyArray_GETPTR2(ndarray m, npy_intp i, npy_intp j) nogil
+    void* PyArray_GETPTR3(ndarray m, npy_intp i, npy_intp j, npy_intp k) nogil
+    void* PyArray_GETPTR4(ndarray m, npy_intp i, npy_intp j, npy_intp k, npy_intp l) nogil
+
+    void PyArray_XDECREF_ERR(ndarray)
+    # Cannot be supported due to out arg
+    # void PyArray_DESCR_REPLACE(descr)
+
+
+    object PyArray_Copy(ndarray)
+    object PyArray_FromObject(object op, int type, int min_depth, int max_depth)
+    object PyArray_ContiguousFromObject(object op, int type, int min_depth, int max_depth)
+    object PyArray_CopyFromObject(object op, int type, int min_depth, int max_depth)
+
+    object PyArray_Cast(ndarray mp, int type_num)
+    object PyArray_Take(ndarray ap, object items, int axis)
+    object PyArray_Put(ndarray ap, object items, object values)
+
+    void PyArray_ITER_RESET(flatiter it) nogil
+    void PyArray_ITER_NEXT(flatiter it) nogil
+    void PyArray_ITER_GOTO(flatiter it, npy_intp* destination) nogil
+    void PyArray_ITER_GOTO1D(flatiter it, npy_intp ind) nogil
+    void* PyArray_ITER_DATA(flatiter it) nogil
+    bint PyArray_ITER_NOTDONE(flatiter it) nogil
+
+    void PyArray_MultiIter_RESET(broadcast multi) nogil
+    void PyArray_MultiIter_NEXT(broadcast multi) nogil
+    void PyArray_MultiIter_GOTO(broadcast multi, npy_intp dest) nogil
+    void PyArray_MultiIter_GOTO1D(broadcast multi, npy_intp ind) nogil
+    void* PyArray_MultiIter_DATA(broadcast multi, npy_intp i) nogil
+    void PyArray_MultiIter_NEXTi(broadcast multi, npy_intp i) nogil
+    bint PyArray_MultiIter_NOTDONE(broadcast multi) nogil
+
+    # Functions from __multiarray_api.h
+
+    # Functions taking dtype and returning object/ndarray are disabled
+    # for now as they steal dtype references. I'm conservative and disable
+    # more than is probably needed until it can be checked further.
+    int PyArray_SetNumericOps        (object)
+    object PyArray_GetNumericOps ()
+    int PyArray_INCREF (ndarray)
+    int PyArray_XDECREF (ndarray)
+    void PyArray_SetStringFunction (object, int)
+    dtype PyArray_DescrFromType (int)
+    object PyArray_TypeObjectFromType (int)
+    char * PyArray_Zero (ndarray)
+    char * PyArray_One (ndarray)
+    #object PyArray_CastToType (ndarray, dtype, int)
+    int PyArray_CastTo (ndarray, ndarray)
+    int PyArray_CastAnyTo (ndarray, ndarray)
+    int PyArray_CanCastSafely (int, int)
+    npy_bool PyArray_CanCastTo (dtype, dtype)
+    int PyArray_ObjectType (object, int)
+    dtype PyArray_DescrFromObject (object, dtype)
+    #ndarray* PyArray_ConvertToCommonType (object, int *)
+    dtype PyArray_DescrFromScalar (object)
+    dtype PyArray_DescrFromTypeObject (object)
+    npy_intp PyArray_Size (object)
+    #object PyArray_Scalar (void *, dtype, object)
+    #object PyArray_FromScalar (object, dtype)
+    void PyArray_ScalarAsCtype (object, void *)
+    #int PyArray_CastScalarToCtype (object, void *, dtype)
+    #int PyArray_CastScalarDirect (object, dtype, void *, int)
+    object PyArray_ScalarFromObject (object)
+    #PyArray_VectorUnaryFunc * PyArray_GetCastFunc (dtype, int)
+    object PyArray_FromDims (int, int *, int)
+    #object PyArray_FromDimsAndDataAndDescr (int, int *, dtype, char *)
+    #object PyArray_FromAny (object, dtype, int, int, int, object)
+    object PyArray_EnsureArray (object)
+    object PyArray_EnsureAnyArray (object)
+    #object PyArray_FromFile (stdio.FILE *, dtype, npy_intp, char *)
+    #object PyArray_FromString (char *, npy_intp, dtype, npy_intp, char *)
+    #object PyArray_FromBuffer (object, dtype, npy_intp, npy_intp)
+    #object PyArray_FromIter (object, dtype, npy_intp)
+    object PyArray_Return (ndarray)
+    #object PyArray_GetField (ndarray, dtype, int)
+    #int PyArray_SetField (ndarray, dtype, int, object)
+    object PyArray_Byteswap (ndarray, npy_bool)
+    object PyArray_Resize (ndarray, PyArray_Dims *, int, NPY_ORDER)
+    int PyArray_MoveInto (ndarray, ndarray)
+    int PyArray_CopyInto (ndarray, ndarray)
+    int PyArray_CopyAnyInto (ndarray, ndarray)
+    int PyArray_CopyObject (ndarray, object)
+    object PyArray_NewCopy (ndarray, NPY_ORDER)
+    object PyArray_ToList (ndarray)
+    object PyArray_ToString (ndarray, NPY_ORDER)
+    int PyArray_ToFile (ndarray, stdio.FILE *, char *, char *)
+    int PyArray_Dump (object, object, int)
+    object PyArray_Dumps (object, int)
+    int PyArray_ValidType (int)
+    void PyArray_UpdateFlags (ndarray, int)
+    object PyArray_New (type, int, npy_intp *, int, npy_intp *, void *, int, int, object)
+    #object PyArray_NewFromDescr (type, dtype, int, npy_intp *, npy_intp *, void *, int, object)
+    #dtype PyArray_DescrNew (dtype)
+    dtype PyArray_DescrNewFromType (int)
+    double PyArray_GetPriority (object, double)
+    object PyArray_IterNew (object)
+    object PyArray_MultiIterNew (int, ...)
+
+    int PyArray_PyIntAsInt (object)
+    npy_intp PyArray_PyIntAsIntp (object)
+    int PyArray_Broadcast (broadcast)
+    void PyArray_FillObjectArray (ndarray, object)
+    int PyArray_FillWithScalar (ndarray, object)
+    npy_bool PyArray_CheckStrides (int, int, npy_intp, npy_intp, npy_intp *, npy_intp *)
+    dtype PyArray_DescrNewByteorder (dtype, char)
+    object PyArray_IterAllButAxis (object, int *)
+    #object PyArray_CheckFromAny (object, dtype, int, int, int, object)
+    #object PyArray_FromArray (ndarray, dtype, int)
+    object PyArray_FromInterface (object)
+    object PyArray_FromStructInterface (object)
+    #object PyArray_FromArrayAttr (object, dtype, object)
+    #NPY_SCALARKIND PyArray_ScalarKind (int, ndarray*)
+    int PyArray_CanCoerceScalar (int, int, NPY_SCALARKIND)
+    object PyArray_NewFlagsObject (object)
+    npy_bool PyArray_CanCastScalar (type, type)
+    #int PyArray_CompareUCS4 (npy_ucs4 *, npy_ucs4 *, register size_t)
+    int PyArray_RemoveSmallest (broadcast)
+    int PyArray_ElementStrides (object)
+    void PyArray_Item_INCREF (char *, dtype)
+    void PyArray_Item_XDECREF (char *, dtype)
+    object PyArray_FieldNames (object)
+    object PyArray_Transpose (ndarray, PyArray_Dims *)
+    object PyArray_TakeFrom (ndarray, object, int, ndarray, NPY_CLIPMODE)
+    object PyArray_PutTo (ndarray, object, object, NPY_CLIPMODE)
+    object PyArray_PutMask (ndarray, object, object)
+    object PyArray_Repeat (ndarray, object, int)
+    object PyArray_Choose (ndarray, object, ndarray, NPY_CLIPMODE)
+    int PyArray_Sort (ndarray, int, NPY_SORTKIND)
+    object PyArray_ArgSort (ndarray, int, NPY_SORTKIND)
+    object PyArray_SearchSorted (ndarray, object, NPY_SEARCHSIDE, PyObject *)
+    object PyArray_ArgMax (ndarray, int, ndarray)
+    object PyArray_ArgMin (ndarray, int, ndarray)
+    object PyArray_Reshape (ndarray, object)
+    object PyArray_Newshape (ndarray, PyArray_Dims *, NPY_ORDER)
+    object PyArray_Squeeze (ndarray)
+    #object PyArray_View (ndarray, dtype, type)
+    object PyArray_SwapAxes (ndarray, int, int)
+    object PyArray_Max (ndarray, int, ndarray)
+    object PyArray_Min (ndarray, int, ndarray)
+    object PyArray_Ptp (ndarray, int, ndarray)
+    object PyArray_Mean (ndarray, int, int, ndarray)
+    object PyArray_Trace (ndarray, int, int, int, int, ndarray)
+    object PyArray_Diagonal (ndarray, int, int, int)
+    object PyArray_Clip (ndarray, object, object, ndarray)
+    object PyArray_Conjugate (ndarray, ndarray)
+    object PyArray_Nonzero (ndarray)
+    object PyArray_Std (ndarray, int, int, ndarray, int)
+    object PyArray_Sum (ndarray, int, int, ndarray)
+    object PyArray_CumSum (ndarray, int, int, ndarray)
+    object PyArray_Prod (ndarray, int, int, ndarray)
+    object PyArray_CumProd (ndarray, int, int, ndarray)
+    object PyArray_All (ndarray, int, ndarray)
+    object PyArray_Any (ndarray, int, ndarray)
+    object PyArray_Compress (ndarray, object, int, ndarray)
+    object PyArray_Flatten (ndarray, NPY_ORDER)
+    object PyArray_Ravel (ndarray, NPY_ORDER)
+    npy_intp PyArray_MultiplyList (npy_intp *, int)
+    int PyArray_MultiplyIntList (int *, int)
+    void * PyArray_GetPtr (ndarray, npy_intp*)
+    int PyArray_CompareLists (npy_intp *, npy_intp *, int)
+    #int PyArray_AsCArray (object*, void *, npy_intp *, int, dtype)
+    #int PyArray_As1D (object*, char **, int *, int)
+    #int PyArray_As2D (object*, char ***, int *, int *, int)
+    int PyArray_Free (object, void *)
+    #int PyArray_Converter (object, object*)
+    int PyArray_IntpFromSequence (object, npy_intp *, int)
+    object PyArray_Concatenate (object, int)
+    object PyArray_InnerProduct (object, object)
+    object PyArray_MatrixProduct (object, object)
+    object PyArray_CopyAndTranspose (object)
+    object PyArray_Correlate (object, object, int)
+    int PyArray_TypestrConvert (int, int)
+    #int PyArray_DescrConverter (object, dtype*)
+    #int PyArray_DescrConverter2 (object, dtype*)
+    int PyArray_IntpConverter (object, PyArray_Dims *)
+    #int PyArray_BufferConverter (object, chunk)
+    int PyArray_AxisConverter (object, int *)
+    int PyArray_BoolConverter (object, npy_bool *)
+    int PyArray_ByteorderConverter (object, char *)
+    int PyArray_OrderConverter (object, NPY_ORDER *)
+    unsigned char PyArray_EquivTypes (dtype, dtype)
+    #object PyArray_Zeros (int, npy_intp *, dtype, int)
+    #object PyArray_Empty (int, npy_intp *, dtype, int)
+    object PyArray_Where (object, object, object)
+    object PyArray_Arange (double, double, double, int)
+    #object PyArray_ArangeObj (object, object, object, dtype)
+    int PyArray_SortkindConverter (object, NPY_SORTKIND *)
+    object PyArray_LexSort (object, int)
+    object PyArray_Round (ndarray, int, ndarray)
+    unsigned char PyArray_EquivTypenums (int, int)
+    int PyArray_RegisterDataType (dtype)
+    int PyArray_RegisterCastFunc (dtype, int, PyArray_VectorUnaryFunc *)
+    int PyArray_RegisterCanCast (dtype, int, NPY_SCALARKIND)
+    #void PyArray_InitArrFuncs (PyArray_ArrFuncs *)
+    object PyArray_IntTupleFromIntp (int, npy_intp *)
+    int PyArray_TypeNumFromName (char *)
+    int PyArray_ClipmodeConverter (object, NPY_CLIPMODE *)
+    #int PyArray_OutputConverter (object, ndarray*)
+    object PyArray_BroadcastToShape (object, npy_intp *, int)
+    void _PyArray_SigintHandler (int)
+    void* _PyArray_GetSigintBuf ()
+    #int PyArray_DescrAlignConverter (object, dtype*)
+    #int PyArray_DescrAlignConverter2 (object, dtype*)
+    int PyArray_SearchsideConverter (object, void *)
+    object PyArray_CheckAxis (ndarray, int *, int)
+    npy_intp PyArray_OverflowMultiplyList (npy_intp *, int)
+    int PyArray_CompareString (char *, char *, size_t)
+    int PyArray_SetBaseObject(ndarray, base)  # NOTE: steals a reference to base! Use "set_array_base()" instead.
+
+
+# Typedefs that matches the runtime dtype objects in
+# the numpy module.
+
+# The ones that are commented out needs an IFDEF function
+# in Cython to enable them only on the right systems.
+
+ctypedef npy_int8       int8_t
+ctypedef npy_int16      int16_t
+ctypedef npy_int32      int32_t
+ctypedef npy_int64      int64_t
+#ctypedef npy_int96      int96_t
+#ctypedef npy_int128     int128_t
+
+ctypedef npy_uint8      uint8_t
+ctypedef npy_uint16     uint16_t
+ctypedef npy_uint32     uint32_t
+ctypedef npy_uint64     uint64_t
+#ctypedef npy_uint96     uint96_t
+#ctypedef npy_uint128    uint128_t
+
+ctypedef npy_float32    float32_t
+ctypedef npy_float64    float64_t
+#ctypedef npy_float80    float80_t
+#ctypedef npy_float128   float128_t
+
+ctypedef float complex  complex64_t
+ctypedef double complex complex128_t
+
+# The int types are mapped a bit surprising --
+# numpy.int corresponds to 'l' and numpy.long to 'q'
+ctypedef npy_long       int_t
+ctypedef npy_longlong   longlong_t
+
+ctypedef npy_ulong      uint_t
+ctypedef npy_ulonglong  ulonglong_t
+
+ctypedef npy_intp       intp_t
+ctypedef npy_uintp      uintp_t
+
+ctypedef npy_double     float_t
+ctypedef npy_double     double_t
+ctypedef npy_longdouble longdouble_t
+
+ctypedef npy_cfloat      cfloat_t
+ctypedef npy_cdouble     cdouble_t
+ctypedef npy_clongdouble clongdouble_t
+
+ctypedef npy_cdouble     complex_t
+
+cdef inline object PyArray_MultiIterNew1(a):
+    return PyArray_MultiIterNew(1, <void*>a)
+
+cdef inline object PyArray_MultiIterNew2(a, b):
+    return PyArray_MultiIterNew(2, <void*>a, <void*>b)
+
+cdef inline object PyArray_MultiIterNew3(a, b, c):
+    return PyArray_MultiIterNew(3, <void*>a, <void*>b, <void*> c)
+
+cdef inline object PyArray_MultiIterNew4(a, b, c, d):
+    return PyArray_MultiIterNew(4, <void*>a, <void*>b, <void*>c, <void*> d)
+
+cdef inline object PyArray_MultiIterNew5(a, b, c, d, e):
+    return PyArray_MultiIterNew(5, <void*>a, <void*>b, <void*>c, <void*> d, <void*> e)
+
+cdef inline tuple PyDataType_SHAPE(dtype d):
+    if PyDataType_HASSUBARRAY(d):
+        return <tuple>d.subarray.shape
+    else:
+        return ()
+
+
+cdef extern from "numpy/ndarrayobject.h":
+    PyTypeObject PyTimedeltaArrType_Type
+    PyTypeObject PyDatetimeArrType_Type
+    ctypedef int64_t npy_timedelta
+    ctypedef int64_t npy_datetime
+
+cdef extern from "numpy/ndarraytypes.h":
+    ctypedef struct PyArray_DatetimeMetaData:
+        NPY_DATETIMEUNIT base
+        int64_t num
+
+cdef extern from "numpy/arrayscalars.h":
+
+    # abstract types
+    ctypedef class numpy.generic [object PyObject]:
+        pass
+    ctypedef class numpy.number [object PyObject]:
+        pass
+    ctypedef class numpy.integer [object PyObject]:
+        pass
+    ctypedef class numpy.signedinteger [object PyObject]:
+        pass
+    ctypedef class numpy.unsignedinteger [object PyObject]:
+        pass
+    ctypedef class numpy.inexact [object PyObject]:
+        pass
+    ctypedef class numpy.floating [object PyObject]:
+        pass
+    ctypedef class numpy.complexfloating [object PyObject]:
+        pass
+    ctypedef class numpy.flexible [object PyObject]:
+        pass
+    ctypedef class numpy.character [object PyObject]:
+        pass
+
+    ctypedef struct PyDatetimeScalarObject:
+        # PyObject_HEAD
+        npy_datetime obval
+        PyArray_DatetimeMetaData obmeta
+
+    ctypedef struct PyTimedeltaScalarObject:
+        # PyObject_HEAD
+        npy_timedelta obval
+        PyArray_DatetimeMetaData obmeta
+
+    ctypedef enum NPY_DATETIMEUNIT:
+        NPY_FR_Y
+        NPY_FR_M
+        NPY_FR_W
+        NPY_FR_D
+        NPY_FR_B
+        NPY_FR_h
+        NPY_FR_m
+        NPY_FR_s
+        NPY_FR_ms
+        NPY_FR_us
+        NPY_FR_ns
+        NPY_FR_ps
+        NPY_FR_fs
+        NPY_FR_as
+
+
+#
+# ufunc API
+#
+
+cdef extern from "numpy/ufuncobject.h":
+
+    ctypedef void (*PyUFuncGenericFunction) (char **, npy_intp *, npy_intp *, void *)
+
+    ctypedef class numpy.ufunc [object PyUFuncObject, check_size ignore]:
+        cdef:
+            int nin, nout, nargs
+            int identity
+            PyUFuncGenericFunction *functions
+            void **data
+            int ntypes
+            int check_return
+            char *name
+            char *types
+            char *doc
+            void *ptr
+            PyObject *obj
+            PyObject *userloops
+
+    cdef enum:
+        PyUFunc_Zero
+        PyUFunc_One
+        PyUFunc_None
+        UFUNC_ERR_IGNORE
+        UFUNC_ERR_WARN
+        UFUNC_ERR_RAISE
+        UFUNC_ERR_CALL
+        UFUNC_ERR_PRINT
+        UFUNC_ERR_LOG
+        UFUNC_MASK_DIVIDEBYZERO
+        UFUNC_MASK_OVERFLOW
+        UFUNC_MASK_UNDERFLOW
+        UFUNC_MASK_INVALID
+        UFUNC_SHIFT_DIVIDEBYZERO
+        UFUNC_SHIFT_OVERFLOW
+        UFUNC_SHIFT_UNDERFLOW
+        UFUNC_SHIFT_INVALID
+        UFUNC_FPE_DIVIDEBYZERO
+        UFUNC_FPE_OVERFLOW
+        UFUNC_FPE_UNDERFLOW
+        UFUNC_FPE_INVALID
+        UFUNC_ERR_DEFAULT
+        UFUNC_ERR_DEFAULT2
+
+    object PyUFunc_FromFuncAndData(PyUFuncGenericFunction *,
+          void **, char *, int, int, int, int, char *, char *, int)
+    int PyUFunc_RegisterLoopForType(ufunc, int,
+                                    PyUFuncGenericFunction, int *, void *)
+    int PyUFunc_GenericFunction \
+        (ufunc, PyObject *, PyObject *, PyArrayObject **)
+    void PyUFunc_f_f_As_d_d \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_d_d \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_f_f \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_g_g \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_F_F_As_D_D \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_F_F \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_D_D \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_G_G \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_O_O \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_ff_f_As_dd_d \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_ff_f \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_dd_d \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_gg_g \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_FF_F_As_DD_D \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_DD_D \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_FF_F \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_GG_G \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_OO_O \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_O_O_method \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_OO_O_method \
+         (char **, npy_intp *, npy_intp *, void *)
+    void PyUFunc_On_Om \
+         (char **, npy_intp *, npy_intp *, void *)
+    int PyUFunc_GetPyValues \
+        (char *, int *, int *, PyObject **)
+    int PyUFunc_checkfperr \
+           (int, PyObject *, int *)
+    void PyUFunc_clearfperr()
+    int PyUFunc_getfperr()
+    int PyUFunc_handlefperr \
+        (int, PyObject *, int, int *)
+    int PyUFunc_ReplaceLoopBySignature \
+        (ufunc, PyUFuncGenericFunction, int *, PyUFuncGenericFunction *)
+    object PyUFunc_FromFuncAndDataAndSignature \
+             (PyUFuncGenericFunction *, void **, char *, int, int, int,
+              int, char *, char *, int, char *)
+
+    int _import_umath() except -1
+
+cdef inline void set_array_base(ndarray arr, object base):
+    Py_INCREF(base) # important to do this before stealing the reference below!
+    PyArray_SetBaseObject(arr, base)
+
+cdef inline object get_array_base(ndarray arr):
+    base = PyArray_BASE(arr)
+    if base is NULL:
+        return None
+    return <object>base
+
+# Versions of the import_* functions which are more suitable for
+# Cython code.
+cdef inline int import_array() except -1:
+    try:
+        __pyx_import_array()
+    except Exception:
+        raise ImportError("numpy.core.multiarray failed to import")
+
+cdef inline int import_umath() except -1:
+    try:
+        _import_umath()
+    except Exception:
+        raise ImportError("numpy.core.umath failed to import")
+
+cdef inline int import_ufunc() except -1:
+    try:
+        _import_umath()
+    except Exception:
+        raise ImportError("numpy.core.umath failed to import")
+
+
+cdef inline bint is_timedelta64_object(object obj):
+    """
+    Cython equivalent of `isinstance(obj, np.timedelta64)`
+
+    Parameters
+    ----------
+    obj : object
+
+    Returns
+    -------
+    bool
+    """
+    return PyObject_TypeCheck(obj, &PyTimedeltaArrType_Type)
+
+
+cdef inline bint is_datetime64_object(object obj):
+    """
+    Cython equivalent of `isinstance(obj, np.datetime64)`
+
+    Parameters
+    ----------
+    obj : object
+
+    Returns
+    -------
+    bool
+    """
+    return PyObject_TypeCheck(obj, &PyDatetimeArrType_Type)
+
+
+cdef inline npy_datetime get_datetime64_value(object obj) nogil:
+    """
+    returns the int64 value underlying scalar numpy datetime64 object
+
+    Note that to interpret this as a datetime, the corresponding unit is
+    also needed.  That can be found using `get_datetime64_unit`.
+    """
+    return (<PyDatetimeScalarObject*>obj).obval
+
+
+cdef inline npy_timedelta get_timedelta64_value(object obj) nogil:
+    """
+    returns the int64 value underlying scalar numpy timedelta64 object
+    """
+    return (<PyTimedeltaScalarObject*>obj).obval
+
+
+cdef inline NPY_DATETIMEUNIT get_datetime64_unit(object obj) nogil:
+    """
+    returns the unit part of the dtype for a numpy datetime64 object.
+    """
+    return <NPY_DATETIMEUNIT>(<PyDatetimeScalarObject*>obj).obmeta.base
diff --git a/contrib/tools/cython_py2/Cython/Includes/posix/types.pxd b/contrib/tools/cython_py2/Cython/Includes/posix/types.pxd
new file mode 100644
index 00000000000..308f2954ee2
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/posix/types.pxd
@@ -0,0 +1,30 @@
+# Note that the actual size of these types is system-dependent, and
+# can't be detected at C compile time.  However, the generated C code
+# will correctly use the actual size of these types *except* for
+# determining promotion in binary arithmetic expressions involving
+# mixed types.  In this case, operands are promoted to the declared
+# larger type, with a bias towards typedef types.  Thus, with the
+# declarations below, long + time_t will result in a time_t whereas
+# long long + time_t will result in a long long which should be
+# acceptable for either 32-bit or 64-bit signed time_t (though admittedly
+# the POSIX standard doesn't even specify that time_t must be an integral
+# type).
+
+cdef extern from "<sys/types.h>":
+    ctypedef long blkcnt_t
+    ctypedef long blksize_t
+    ctypedef long clockid_t
+    ctypedef long dev_t
+    ctypedef long gid_t
+    ctypedef long id_t
+    ctypedef unsigned long ino_t
+    ctypedef long mode_t
+    ctypedef long nlink_t
+    ctypedef long off_t
+    ctypedef long pid_t
+    ctypedef struct sigset_t:
+        pass
+    ctypedef long suseconds_t
+    ctypedef long time_t
+    ctypedef long timer_t
+    ctypedef long uid_t
diff --git a/contrib/tools/cython_py2/Cython/Includes/posix/unistd.pxd b/contrib/tools/cython_py2/Cython/Includes/posix/unistd.pxd
new file mode 100644
index 00000000000..1afeca38545
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Includes/posix/unistd.pxd
@@ -0,0 +1,271 @@
+# http://www.opengroup.org/onlinepubs/009695399/basedefs/unistd.h.html
+
+from posix.types cimport gid_t, pid_t, off_t, uid_t
+
+cdef extern from "<unistd.h>" nogil:
+
+    #:NULL
+
+    enum: R_OK
+    enum: W_OK
+    enum: X_OK
+    enum: F_OK
+
+    enum: _CS_PATH
+    enum: _CS_POSIX_V6_ILP32_OFF32_CFLAGS
+    enum: _CS_POSIX_V6_ILP32_OFF32_LDFLAGS
+    enum: _CS_POSIX_V6_ILP32_OFF32_LIBS
+    enum: _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS
+    enum: _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS
+    enum: _CS_POSIX_V6_ILP32_OFFBIG_LIBS
+    enum: _CS_POSIX_V6_LP64_OFF64_CFLAGS
+    enum: _CS_POSIX_V6_LP64_OFF64_LDFLAGS
+    enum: _CS_POSIX_V6_LP64_OFF64_LIBS
+    enum: _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS
+    enum: _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS
+    enum: _CS_POSIX_V6_LPBIG_OFFBIG_LIBS
+    enum: _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS
+
+    enum: SEEK_SET
+    enum: SEEK_CUR
+    enum: SEEK_END
+
+    enum: F_LOCK
+    enum: F_TEST
+    enum: F_TLOCK
+    enum: F_ULOCK
+
+    enum: _PC_2_SYMLINKS
+    enum: _PC_ALLOC_SIZE_MIN
+    enum: _PC_ASYNC_IO
+    enum: _PC_CHOWN_RESTRICTED
+    enum: _PC_FILESIZEBITS
+    enum: _PC_LINK_MAX
+    enum: _PC_MAX_CANON
+    enum: _PC_MAX_INPUT
+    enum: _PC_NAME_MAX
+    enum: _PC_NO_TRUNC
+    enum: _PC_PATH_MAX
+    enum: _PC_PIPE_BUF
+    enum: _PC_PRIO_IO
+    enum: _PC_REC_INCR_XFER_SIZE
+    enum: _PC_REC_MIN_XFER_SIZE
+    enum: _PC_REC_XFER_ALIGN
+    enum: _PC_SYMLINK_MAX
+    enum: _PC_SYNC_IO
+    enum: _PC_VDISABLE
+
+    enum: _SC_2_C_BIND
+    enum: _SC_2_C_DEV
+    enum: _SC_2_CHAR_TERM
+    enum: _SC_2_FORT_DEV
+    enum: _SC_2_FORT_RUN
+    enum: _SC_2_LOCALEDEF
+    enum: _SC_2_PBS
+    enum: _SC_2_PBS_ACCOUNTING
+    enum: _SC_2_PBS_CHECKPOINT
+    enum: _SC_2_PBS_LOCATE
+    enum: _SC_2_PBS_MESSAGE
+    enum: _SC_2_PBS_TRACK
+    enum: _SC_2_SW_DEV
+    enum: _SC_2_UPE
+    enum: _SC_2_VERSION
+    enum: _SC_ADVISORY_INFO
+    enum: _SC_AIO_LISTIO_MAX
+    enum: _SC_AIO_MAX
+    enum: _SC_AIO_PRIO_DELTA_MAX
+    enum: _SC_ARG_MAX
+    enum: _SC_ASYNCHRONOUS_IO
+    enum: _SC_ATEXIT_MAX
+    enum: _SC_BARRIERS
+    enum: _SC_BC_BASE_MAX
+    enum: _SC_BC_DIM_MAX
+    enum: _SC_BC_SCALE_MAX
+    enum: _SC_BC_STRING_MAX
+    enum: _SC_CHILD_MAX
+    enum: _SC_CLK_TCK
+    enum: _SC_CLOCK_SELECTION
+    enum: _SC_COLL_WEIGHTS_MAX
+    enum: _SC_CPUTIME
+    enum: _SC_DELAYTIMER_MAX
+    enum: _SC_EXPR_NEST_MAX
+    enum: _SC_FSYNC
+    enum: _SC_GETGR_R_SIZE_MAX
+    enum: _SC_GETPW_R_SIZE_MAX
+    enum: _SC_HOST_NAME_MAX
+    enum: _SC_IOV_MAX
+    enum: _SC_IPV6
+    enum: _SC_JOB_CONTROL
+    enum: _SC_LINE_MAX
+    enum: _SC_LOGIN_NAME_MAX
+    enum: _SC_MAPPED_FILES
+    enum: _SC_MEMLOCK
+    enum: _SC_MEMLOCK_RANGE
+    enum: _SC_MEMORY_PROTECTION
+    enum: _SC_MESSAGE_PASSING
+    enum: _SC_MONOTONIC_CLOCK
+    enum: _SC_MQ_OPEN_MAX
+    enum: _SC_MQ_PRIO_MAX
+    enum: _SC_NGROUPS_MAX
+    enum: _SC_OPEN_MAX
+    enum: _SC_PAGE_SIZE
+    enum: _SC_PAGESIZE
+    enum: _SC_PRIORITIZED_IO
+    enum: _SC_PRIORITY_SCHEDULING
+    enum: _SC_RAW_SOCKETS
+    enum: _SC_RE_DUP_MAX
+    enum: _SC_READER_WRITER_LOCKS
+    enum: _SC_REALTIME_SIGNALS
+    enum: _SC_REGEXP
+    enum: _SC_RTSIG_MAX
+    enum: _SC_SAVED_IDS
+    enum: _SC_SEM_NSEMS_MAX
+    enum: _SC_SEM_VALUE_MAX
+    enum: _SC_SEMAPHORES
+    enum: _SC_SHARED_MEMORY_OBJECTS
+    enum: _SC_SHELL
+    enum: _SC_SIGQUEUE_MAX
+    enum: _SC_SPAWN
+    enum: _SC_SPIN_LOCKS
+    enum: _SC_SPORADIC_SERVER
+    enum: _SC_SS_REPL_MAX
+    enum: _SC_STREAM_MAX
+    enum: _SC_SYMLOOP_MAX
+    enum: _SC_SYNCHRONIZED_IO
+    enum: _SC_THREAD_ATTR_STACKADDR
+    enum: _SC_THREAD_ATTR_STACKSIZE
+    enum: _SC_THREAD_CPUTIME
+    enum: _SC_THREAD_DESTRUCTOR_ITERATIONS
+    enum: _SC_THREAD_KEYS_MAX
+    enum: _SC_THREAD_PRIO_INHERIT
+    enum: _SC_THREAD_PRIO_PROTECT
+    enum: _SC_THREAD_PRIORITY_SCHEDULING
+    enum: _SC_THREAD_PROCESS_SHARED
+    enum: _SC_THREAD_SAFE_FUNCTIONS
+    enum: _SC_THREAD_SPORADIC_SERVER
+    enum: _SC_THREAD_STACK_MIN
+    enum: _SC_THREAD_THREADS_MAX
+    enum: _SC_THREADS
+    enum: _SC_TIMEOUTS
+    enum: _SC_TIMER_MAX
+    enum: _SC_TIMERS
+    enum: _SC_TRACE
+    enum: _SC_TRACE_EVENT_FILTER
+    enum: _SC_TRACE_EVENT_NAME_MAX
+    enum: _SC_TRACE_INHERIT
+    enum: _SC_TRACE_LOG
+    enum: _SC_TRACE_NAME_MAX
+    enum: _SC_TRACE_SYS_MAX
+    enum: _SC_TRACE_USER_EVENT_MAX
+    enum: _SC_TTY_NAME_MAX
+    enum: _SC_TYPED_MEMORY_OBJECTS
+    enum: _SC_TZNAME_MAX
+    enum: _SC_V6_ILP32_OFF32
+    enum: _SC_V6_ILP32_OFFBIG
+    enum: _SC_V6_LP64_OFF64
+    enum: _SC_V6_LPBIG_OFFBIG
+    enum: _SC_VERSION
+    enum: _SC_XBS5_ILP32_OFF32
+    enum: _SC_XBS5_ILP32_OFFBIG
+    enum: _SC_XBS5_LP64_OFF64
+    enum: _SC_XBS5_LPBIG_OFFBIG
+    enum: _SC_XOPEN_CRYPT
+    enum: _SC_XOPEN_ENH_I18N
+    enum: _SC_XOPEN_LEGACY
+    enum: _SC_XOPEN_REALTIME
+    enum: _SC_XOPEN_REALTIME_THREADS
+    enum: _SC_XOPEN_SHM
+    enum: _SC_XOPEN_STREAMS
+    enum: _SC_XOPEN_UNIX
+    enum: _SC_XOPEN_VERSION
+
+    enum: STDIN_FILENO	#0
+    enum: STDOUT_FILENO	#1
+    enum: STDERR_FILENO	#2
+
+    ctypedef unsigned useconds_t
+
+    int          access(const char *, int)
+    unsigned     alarm(unsigned)
+    int          chdir(const char *)
+    int          chown(const char *, uid_t, gid_t)
+    int          close(int)
+    size_t       confstr(int, char *, size_t)
+    char        *crypt(const char *, const char *)
+    char        *ctermid(char *)
+    int          dup(int)
+    int          dup2(int, int)
+    void         encrypt(char[64], int)
+    int          execl(const char *, const char *, ...)
+    int          execle(const char *, const char *, ...)
+    int          execlp(const char *, const char *, ...)
+    int          execv(const char *, char *[])
+    int          execve(const char *, char *[], char *[])
+    int          execvp(const char *, char *[])
+    void        _exit(int)
+    int          fchown(int, uid_t, gid_t)
+    int          fchdir(int)
+    int          fdatasync(int)
+    pid_t        fork()
+    long         fpathconf(int, int)
+    int          fsync(int)
+    int          ftruncate(int, off_t)
+    char        *getcwd(char *, size_t)
+    gid_t        getegid()
+    uid_t        geteuid()
+    gid_t        getgid()
+    int          getgroups(int, gid_t [])
+    long         gethostid()
+    int          gethostname(char *, size_t)
+    char        *getlogin()
+    int          getlogin_r(char *, size_t)
+    int          getopt(int, char * [], const char *)
+    pid_t        getpgid(pid_t)
+    pid_t        getpgrp()
+    pid_t        getpid()
+    pid_t        getppid()
+    pid_t        getsid(pid_t)
+    uid_t        getuid()
+    char        *getwd(char *)
+    int          isatty(int)
+    int          lchown(const char *, uid_t, gid_t)
+    int          link(const char *, const char *)
+    int          lockf(int, int, off_t)
+    off_t        lseek(int, off_t, int)
+    int          nice(int)
+    long         pathconf(char *, int)
+    int          pause()
+    int          pipe(int [2])
+    ssize_t      pread(int, void *, size_t, off_t)
+    ssize_t      pwrite(int, const void *, size_t, off_t)
+    ssize_t      read(int, void *, size_t)
+    ssize_t      readlink(const char *, char *, size_t)
+    int          rmdir(const char *)
+    int          setegid(gid_t)
+    int          seteuid(uid_t)
+    int          setgid(gid_t)
+    int          setpgid(pid_t, pid_t)
+    pid_t        setpgrp()
+    int          setregid(gid_t, gid_t)
+    int          setreuid(uid_t, uid_t)
+    pid_t        setsid()
+    int          setuid(uid_t)
+    unsigned     sleep(unsigned)
+    void         swab(const void *, void *, ssize_t)
+    int          symlink(const char *, const char *)
+    void         sync()
+    long         sysconf(int)
+    pid_t        tcgetpgrp(int)
+    int          tcsetpgrp(int, pid_t)
+    int          truncate(const char *, off_t)
+    char        *ttyname(int)
+    int          ttyname_r(int, char *, size_t)
+    useconds_t   ualarm(useconds_t, useconds_t)
+    int          unlink(const char *)
+    int          usleep(useconds_t)
+    pid_t        vfork()
+    ssize_t      write(int, const void *, size_t)
+    char         *optarg
+    int          optind
+    int          opterr
+    int          optopt
diff --git a/contrib/tools/cython_py2/Cython/Utility/AsyncGen.c b/contrib/tools/cython_py2/Cython/Utility/AsyncGen.c
new file mode 100644
index 00000000000..94b68f19f3d
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/AsyncGen.c
@@ -0,0 +1,1317 @@
+// This is copied from genobject.c in CPython 3.6.
+// Try to keep it in sync by doing this from time to time:
+//    sed -e 's|__pyx_||ig'  Cython/Utility/AsyncGen.c | diff -udw - cpython/Objects/genobject.c | less
+
+//////////////////// AsyncGenerator.proto ////////////////////
+//@requires: Coroutine.c::Coroutine
+
+#define __Pyx_AsyncGen_USED
+typedef struct {
+    __pyx_CoroutineObject coro;
+    PyObject *ag_finalizer;
+    int ag_hooks_inited;
+    int ag_closed;
+    int ag_running_async;
+} __pyx_PyAsyncGenObject;
+
+static PyTypeObject *__pyx__PyAsyncGenWrappedValueType = 0;
+static PyTypeObject *__pyx__PyAsyncGenASendType = 0;
+static PyTypeObject *__pyx__PyAsyncGenAThrowType = 0;
+static PyTypeObject *__pyx_AsyncGenType = 0;
+
+#define __Pyx_AsyncGen_CheckExact(obj) __Pyx_IS_TYPE(obj, __pyx_AsyncGenType)
+#define __pyx_PyAsyncGenASend_CheckExact(o) \
+                    __Pyx_IS_TYPE(o, __pyx__PyAsyncGenASendType)
+#define __pyx_PyAsyncGenAThrow_CheckExact(o) \
+                    __Pyx_IS_TYPE(o, __pyx__PyAsyncGenAThrowType)
+
+static PyObject *__Pyx_async_gen_anext(PyObject *o);
+static CYTHON_INLINE PyObject *__Pyx_async_gen_asend_iternext(PyObject *o);
+static PyObject *__Pyx_async_gen_asend_send(PyObject *o, PyObject *arg);
+static PyObject *__Pyx_async_gen_asend_close(PyObject *o, PyObject *args);
+static PyObject *__Pyx_async_gen_athrow_close(PyObject *o, PyObject *args);
+
+static PyObject *__Pyx__PyAsyncGenValueWrapperNew(PyObject *val);
+
+
+static __pyx_CoroutineObject *__Pyx_AsyncGen_New(
+            __pyx_coroutine_body_t body, PyObject *code, PyObject *closure,
+            PyObject *name, PyObject *qualname, PyObject *module_name) {
+    __pyx_PyAsyncGenObject *gen = PyObject_GC_New(__pyx_PyAsyncGenObject, __pyx_AsyncGenType);
+    if (unlikely(!gen))
+        return NULL;
+    gen->ag_finalizer = NULL;
+    gen->ag_closed = 0;
+    gen->ag_hooks_inited = 0;
+    gen->ag_running_async = 0;
+    return __Pyx__Coroutine_NewInit((__pyx_CoroutineObject*)gen, body, code, closure, name, qualname, module_name);
+}
+
+static int __pyx_AsyncGen_init(PyObject *module);
+static void __Pyx_PyAsyncGen_Fini(void);
+
+//////////////////// AsyncGenerator.cleanup ////////////////////
+
+__Pyx_PyAsyncGen_Fini();
+
+//////////////////// AsyncGeneratorInitFinalizer ////////////////////
+
+// this is separated out because it needs more adaptation
+
+#if PY_VERSION_HEX < 0x030600B0
+static int __Pyx_async_gen_init_hooks(__pyx_PyAsyncGenObject *o) {
+#if 0
+    // TODO: implement finalizer support in older Python versions
+    PyThreadState *tstate;
+    PyObject *finalizer;
+    PyObject *firstiter;
+#endif
+
+    if (likely(o->ag_hooks_inited)) {
+        return 0;
+    }
+
+    o->ag_hooks_inited = 1;
+
+#if 0
+    tstate = __Pyx_PyThreadState_Current;
+
+    finalizer = tstate->async_gen_finalizer;
+    if (finalizer) {
+        Py_INCREF(finalizer);
+        o->ag_finalizer = finalizer;
+    }
+
+    firstiter = tstate->async_gen_firstiter;
+    if (firstiter) {
+        PyObject *res;
+
+        Py_INCREF(firstiter);
+        res = __Pyx_PyObject_CallOneArg(firstiter, (PyObject*)o);
+        Py_DECREF(firstiter);
+        if (res == NULL) {
+            return 1;
+        }
+        Py_DECREF(res);
+    }
+#endif
+
+    return 0;
+}
+#endif
+
+
+//////////////////// AsyncGenerator ////////////////////
+//@requires: AsyncGeneratorInitFinalizer
+//@requires: Coroutine.c::Coroutine
+//@requires: Coroutine.c::ReturnWithStopIteration
+//@requires: ObjectHandling.c::PyObjectCall2Args
+//@requires: ObjectHandling.c::PyObject_GenericGetAttrNoDict
+
+PyDoc_STRVAR(__Pyx_async_gen_send_doc,
+"send(arg) -> send 'arg' into generator,\n\
+return next yielded value or raise StopIteration.");
+
+PyDoc_STRVAR(__Pyx_async_gen_close_doc,
+"close() -> raise GeneratorExit inside generator.");
+
+PyDoc_STRVAR(__Pyx_async_gen_throw_doc,
+"throw(typ[,val[,tb]]) -> raise exception in generator,\n\
+return next yielded value or raise StopIteration.");
+
+PyDoc_STRVAR(__Pyx_async_gen_await_doc,
+"__await__() -> return a representation that can be passed into the 'await' expression.");
+
+// COPY STARTS HERE:
+
+static PyObject *__Pyx_async_gen_asend_new(__pyx_PyAsyncGenObject *, PyObject *);
+static PyObject *__Pyx_async_gen_athrow_new(__pyx_PyAsyncGenObject *, PyObject *);
+
+static const char *__Pyx_NON_INIT_CORO_MSG = "can't send non-None value to a just-started coroutine";
+static const char *__Pyx_ASYNC_GEN_IGNORED_EXIT_MSG = "async generator ignored GeneratorExit";
+static const char *__Pyx_ASYNC_GEN_CANNOT_REUSE_SEND_MSG = "cannot reuse already awaited __anext__()/asend()";
+static const char *__Pyx_ASYNC_GEN_CANNOT_REUSE_CLOSE_MSG = "cannot reuse already awaited aclose()/athrow()";
+
+typedef enum {
+    __PYX_AWAITABLE_STATE_INIT,   /* new awaitable, has not yet been iterated */
+    __PYX_AWAITABLE_STATE_ITER,   /* being iterated */
+    __PYX_AWAITABLE_STATE_CLOSED, /* closed */
+} __pyx_AwaitableState;
+
+typedef struct {
+    PyObject_HEAD
+    __pyx_PyAsyncGenObject *ags_gen;
+
+    /* Can be NULL, when in the __anext__() mode (equivalent of "asend(None)") */
+    PyObject *ags_sendval;
+
+    __pyx_AwaitableState ags_state;
+} __pyx_PyAsyncGenASend;
+
+
+typedef struct {
+    PyObject_HEAD
+    __pyx_PyAsyncGenObject *agt_gen;
+
+    /* Can be NULL, when in the "aclose()" mode (equivalent of "athrow(GeneratorExit)") */
+    PyObject *agt_args;
+
+    __pyx_AwaitableState agt_state;
+} __pyx_PyAsyncGenAThrow;
+
+
+typedef struct {
+    PyObject_HEAD
+    PyObject *agw_val;
+} __pyx__PyAsyncGenWrappedValue;
+
+
+#ifndef _PyAsyncGen_MAXFREELIST
+#define _PyAsyncGen_MAXFREELIST 80
+#endif
+
+// Freelists boost performance 6-10%; they also reduce memory
+// fragmentation, as _PyAsyncGenWrappedValue and PyAsyncGenASend
+// are short-living objects that are instantiated for every
+// __anext__ call.
+
+static __pyx__PyAsyncGenWrappedValue *__Pyx_ag_value_freelist[_PyAsyncGen_MAXFREELIST];
+static int __Pyx_ag_value_freelist_free = 0;
+
+static __pyx_PyAsyncGenASend *__Pyx_ag_asend_freelist[_PyAsyncGen_MAXFREELIST];
+static int __Pyx_ag_asend_freelist_free = 0;
+
+#define __pyx__PyAsyncGenWrappedValue_CheckExact(o) \
+                    __Pyx_IS_TYPE(o, __pyx__PyAsyncGenWrappedValueType)
+
+
+static int
+__Pyx_async_gen_traverse(__pyx_PyAsyncGenObject *gen, visitproc visit, void *arg)
+{
+    Py_VISIT(gen->ag_finalizer);
+    return __Pyx_Coroutine_traverse((__pyx_CoroutineObject*)gen, visit, arg);
+}
+
+
+static PyObject *
+__Pyx_async_gen_repr(__pyx_CoroutineObject *o)
+{
+    // avoid NULL pointer dereference for qualname during garbage collection
+    return PyUnicode_FromFormat("<async_generator object %S at %p>",
+                                o->gi_qualname ? o->gi_qualname : Py_None, o);
+}
+
+
+#if PY_VERSION_HEX >= 0x030600B0
+static int
+__Pyx_async_gen_init_hooks(__pyx_PyAsyncGenObject *o)
+{
+#if !CYTHON_COMPILING_IN_PYPY
+    PyThreadState *tstate;
+#endif
+    PyObject *finalizer;
+    PyObject *firstiter;
+
+    if (o->ag_hooks_inited) {
+        return 0;
+    }
+
+    o->ag_hooks_inited = 1;
+
+#if CYTHON_COMPILING_IN_PYPY
+    finalizer = _PyEval_GetAsyncGenFinalizer();
+#else
+    tstate = __Pyx_PyThreadState_Current;
+    finalizer = tstate->async_gen_finalizer;
+#endif
+    if (finalizer) {
+        Py_INCREF(finalizer);
+        o->ag_finalizer = finalizer;
+    }
+
+#if CYTHON_COMPILING_IN_PYPY
+    firstiter = _PyEval_GetAsyncGenFirstiter();
+#else
+    firstiter = tstate->async_gen_firstiter;
+#endif
+    if (firstiter) {
+        PyObject *res;
+#if CYTHON_UNPACK_METHODS
+        PyObject *self;
+#endif
+
+        Py_INCREF(firstiter);
+        // at least asyncio stores methods here => optimise the call
+#if CYTHON_UNPACK_METHODS
+        if (likely(PyMethod_Check(firstiter)) && likely((self = PyMethod_GET_SELF(firstiter)) != NULL)) {
+            PyObject *function = PyMethod_GET_FUNCTION(firstiter);
+            res = __Pyx_PyObject_Call2Args(function, self, (PyObject*)o);
+        } else
+#endif
+        res = __Pyx_PyObject_CallOneArg(firstiter, (PyObject*)o);
+
+        Py_DECREF(firstiter);
+        if (unlikely(res == NULL)) {
+            return 1;
+        }
+        Py_DECREF(res);
+    }
+
+    return 0;
+}
+#endif
+
+
+static PyObject *
+__Pyx_async_gen_anext(PyObject *g)
+{
+    __pyx_PyAsyncGenObject *o = (__pyx_PyAsyncGenObject*) g;
+    if (unlikely(__Pyx_async_gen_init_hooks(o))) {
+        return NULL;
+    }
+    return __Pyx_async_gen_asend_new(o, NULL);
+}
+
+static PyObject *
+__Pyx_async_gen_anext_method(PyObject *g, PyObject *arg) {
+    CYTHON_UNUSED_VAR(arg);
+    return __Pyx_async_gen_anext(g);
+}
+
+
+static PyObject *
+__Pyx_async_gen_asend(__pyx_PyAsyncGenObject *o, PyObject *arg)
+{
+    if (unlikely(__Pyx_async_gen_init_hooks(o))) {
+        return NULL;
+    }
+    return __Pyx_async_gen_asend_new(o, arg);
+}
+
+
+static PyObject *
+__Pyx_async_gen_aclose(__pyx_PyAsyncGenObject *o, PyObject *arg)
+{
+    CYTHON_UNUSED_VAR(arg);
+    if (unlikely(__Pyx_async_gen_init_hooks(o))) {
+        return NULL;
+    }
+    return __Pyx_async_gen_athrow_new(o, NULL);
+}
+
+
+static PyObject *
+__Pyx_async_gen_athrow(__pyx_PyAsyncGenObject *o, PyObject *args)
+{
+    if (unlikely(__Pyx_async_gen_init_hooks(o))) {
+        return NULL;
+    }
+    return __Pyx_async_gen_athrow_new(o, args);
+}
+
+
+static PyObject *
+__Pyx_async_gen_self_method(PyObject *g, PyObject *arg) {
+    CYTHON_UNUSED_VAR(arg);
+    return __Pyx_NewRef(g);
+}
+
+
+static PyGetSetDef __Pyx_async_gen_getsetlist[] = {
+    {(char*) "__name__", (getter)__Pyx_Coroutine_get_name, (setter)__Pyx_Coroutine_set_name,
+     (char*) PyDoc_STR("name of the async generator"), 0},
+    {(char*) "__qualname__", (getter)__Pyx_Coroutine_get_qualname, (setter)__Pyx_Coroutine_set_qualname,
+     (char*) PyDoc_STR("qualified name of the async generator"), 0},
+    //REMOVED: {(char*) "ag_await", (getter)coro_get_cr_await, NULL,
+    //REMOVED:  (char*) PyDoc_STR("object being awaited on, or None")},
+    {0, 0, 0, 0, 0} /* Sentinel */
+};
+
+static PyMemberDef __Pyx_async_gen_memberlist[] = {
+    //REMOVED: {(char*) "ag_frame",   T_OBJECT, offsetof(__pyx_PyAsyncGenObject, ag_frame),   READONLY},
+    {(char*) "ag_running", T_BOOL,   offsetof(__pyx_PyAsyncGenObject, ag_running_async), READONLY, NULL},
+    //REMOVED: {(char*) "ag_code",    T_OBJECT, offsetof(__pyx_PyAsyncGenObject, ag_code),    READONLY},
+    //ADDED: "ag_await"
+    {(char*) "ag_await", T_OBJECT, offsetof(__pyx_CoroutineObject, yieldfrom), READONLY,
+     (char*) PyDoc_STR("object being awaited on, or None")},
+    {(char *) "__module__", T_OBJECT, offsetof(__pyx_CoroutineObject, gi_modulename), 0, 0},
+#if CYTHON_USE_TYPE_SPECS
+    {(char *) "__weaklistoffset__", T_PYSSIZET, offsetof(__pyx_CoroutineObject, gi_weakreflist), READONLY, 0},
+#endif
+    {0, 0, 0, 0, 0}      /* Sentinel */
+};
+
+PyDoc_STRVAR(__Pyx_async_aclose_doc,
+"aclose() -> raise GeneratorExit inside generator.");
+
+PyDoc_STRVAR(__Pyx_async_asend_doc,
+"asend(v) -> send 'v' in generator.");
+
+PyDoc_STRVAR(__Pyx_async_athrow_doc,
+"athrow(typ[,val[,tb]]) -> raise exception in generator.");
+
+PyDoc_STRVAR(__Pyx_async_aiter_doc,
+"__aiter__(v) -> return an asynchronous iterator.");
+
+PyDoc_STRVAR(__Pyx_async_anext_doc,
+"__anext__(v) -> continue asynchronous iteration and return the next element.");
+
+static PyMethodDef __Pyx_async_gen_methods[] = {
+    {"asend", (PyCFunction)__Pyx_async_gen_asend, METH_O, __Pyx_async_asend_doc},
+    {"athrow",(PyCFunction)__Pyx_async_gen_athrow, METH_VARARGS, __Pyx_async_athrow_doc},
+    {"aclose", (PyCFunction)__Pyx_async_gen_aclose, METH_NOARGS, __Pyx_async_aclose_doc},
+    {"__aiter__", (PyCFunction)__Pyx_async_gen_self_method, METH_NOARGS, __Pyx_async_aiter_doc},
+    {"__anext__", (PyCFunction)__Pyx_async_gen_anext_method, METH_NOARGS, __Pyx_async_anext_doc},
+    {0, 0, 0, 0}        /* Sentinel */
+};
+
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx_AsyncGenType_slots[] = {
+    {Py_tp_dealloc, (void *)__Pyx_Coroutine_dealloc},
+    {Py_am_aiter, (void *)PyObject_SelfIter},
+    {Py_am_anext, (void *)__Pyx_async_gen_anext},
+    {Py_tp_repr, (void *)__Pyx_async_gen_repr},
+    {Py_tp_traverse, (void *)__Pyx_async_gen_traverse},
+    {Py_tp_methods, (void *)__Pyx_async_gen_methods},
+    {Py_tp_members, (void *)__Pyx_async_gen_memberlist},
+    {Py_tp_getset, (void *)__Pyx_async_gen_getsetlist},
+#if CYTHON_USE_TP_FINALIZE
+    {Py_tp_finalize, (void *)__Pyx_Coroutine_del},
+#endif
+    {0, 0},
+};
+
+static PyType_Spec __pyx_AsyncGenType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "async_generator",
+    sizeof(__pyx_PyAsyncGenObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
+    __pyx_AsyncGenType_slots
+};
+#else /* CYTHON_USE_TYPE_SPECS */
+
+#if CYTHON_USE_ASYNC_SLOTS
+static __Pyx_PyAsyncMethodsStruct __Pyx_async_gen_as_async = {
+    0,                                          /* am_await */
+    PyObject_SelfIter,                          /* am_aiter */
+    (unaryfunc)__Pyx_async_gen_anext,           /* am_anext */
+#if PY_VERSION_HEX >= 0x030A00A3
+    0, /*am_send*/
+#endif
+};
+#endif
+
+static PyTypeObject __pyx_AsyncGenType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    "async_generator",                          /* tp_name */
+    sizeof(__pyx_PyAsyncGenObject),             /* tp_basicsize */
+    0,                                          /* tp_itemsize */
+    (destructor)__Pyx_Coroutine_dealloc,        /* tp_dealloc */
+    0,                                          /* tp_vectorcall_offset */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+#if CYTHON_USE_ASYNC_SLOTS
+    &__Pyx_async_gen_as_async,                        /* tp_as_async */
+#else
+    0,                                          /*tp_reserved*/
+#endif
+    (reprfunc)__Pyx_async_gen_repr,                   /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    0,                                          /* tp_str */
+    0,                                          /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_HAVE_FINALIZE,               /* tp_flags */
+    0,                                          /* tp_doc */
+    (traverseproc)__Pyx_async_gen_traverse,           /* tp_traverse */
+    0,                                          /* tp_clear */
+#if CYTHON_USE_ASYNC_SLOTS && CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3 && PY_VERSION_HEX < 0x030500B1
+    // in order to (mis-)use tp_reserved above, we must also implement tp_richcompare
+    __Pyx_Coroutine_compare,            /*tp_richcompare*/
+#else
+    0,                                  /*tp_richcompare*/
+#endif
+    offsetof(__pyx_CoroutineObject, gi_weakreflist), /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    __Pyx_async_gen_methods,                          /* tp_methods */
+    __Pyx_async_gen_memberlist,                       /* tp_members */
+    __Pyx_async_gen_getsetlist,                       /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    0,                                          /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+    0,                                          /* tp_dictoffset */
+    0,                                          /* tp_init */
+    0,                                          /* tp_alloc */
+    0,                                          /* tp_new */
+    0,                                          /* tp_free */
+    0,                                          /* tp_is_gc */
+    0,                                          /* tp_bases */
+    0,                                          /* tp_mro */
+    0,                                          /* tp_cache */
+    0,                                          /* tp_subclasses */
+    0,                                          /* tp_weaklist */
+#if CYTHON_USE_TP_FINALIZE
+    0,                                  /*tp_del*/
+#else
+    __Pyx_Coroutine_del,                /*tp_del*/
+#endif
+    0,                                          /* tp_version_tag */
+#if CYTHON_USE_TP_FINALIZE
+    __Pyx_Coroutine_del,                        /* tp_finalize */
+#elif PY_VERSION_HEX >= 0x030400a1
+    0,                                          /* tp_finalize */
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                          /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                          /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                          /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif  /* CYTHON_USE_TYPE_SPECS */
+
+
+static int
+__Pyx_PyAsyncGen_ClearFreeLists(void)
+{
+    int ret = __Pyx_ag_value_freelist_free + __Pyx_ag_asend_freelist_free;
+
+    while (__Pyx_ag_value_freelist_free) {
+        __pyx__PyAsyncGenWrappedValue *o;
+        o = __Pyx_ag_value_freelist[--__Pyx_ag_value_freelist_free];
+        assert(__pyx__PyAsyncGenWrappedValue_CheckExact(o));
+        __Pyx_PyHeapTypeObject_GC_Del(o);
+    }
+
+    while (__Pyx_ag_asend_freelist_free) {
+        __pyx_PyAsyncGenASend *o;
+        o = __Pyx_ag_asend_freelist[--__Pyx_ag_asend_freelist_free];
+        assert(__Pyx_IS_TYPE(o, __pyx__PyAsyncGenASendType));
+        __Pyx_PyHeapTypeObject_GC_Del(o);
+    }
+
+    return ret;
+}
+
+static void
+__Pyx_PyAsyncGen_Fini(void)
+{
+    __Pyx_PyAsyncGen_ClearFreeLists();
+}
+
+
+static PyObject *
+__Pyx_async_gen_unwrap_value(__pyx_PyAsyncGenObject *gen, PyObject *result)
+{
+    if (result == NULL) {
+        PyObject *exc_type = PyErr_Occurred();
+        if (!exc_type) {
+            PyErr_SetNone(__Pyx_PyExc_StopAsyncIteration);
+            gen->ag_closed = 1;
+        } else if (__Pyx_PyErr_GivenExceptionMatches2(exc_type, __Pyx_PyExc_StopAsyncIteration, PyExc_GeneratorExit)) {
+            gen->ag_closed = 1;
+        }
+
+        gen->ag_running_async = 0;
+        return NULL;
+    }
+
+    if (__pyx__PyAsyncGenWrappedValue_CheckExact(result)) {
+        /* async yield */
+        __Pyx_ReturnWithStopIteration(((__pyx__PyAsyncGenWrappedValue*)result)->agw_val);
+        Py_DECREF(result);
+        gen->ag_running_async = 0;
+        return NULL;
+    }
+
+    return result;
+}
+
+
+/* ---------- Async Generator ASend Awaitable ------------ */
+
+
+static void
+__Pyx_async_gen_asend_dealloc(__pyx_PyAsyncGenASend *o)
+{
+    PyObject_GC_UnTrack((PyObject *)o);
+    Py_CLEAR(o->ags_gen);
+    Py_CLEAR(o->ags_sendval);
+    if (likely(__Pyx_ag_asend_freelist_free < _PyAsyncGen_MAXFREELIST)) {
+        assert(__pyx_PyAsyncGenASend_CheckExact(o));
+        __Pyx_ag_asend_freelist[__Pyx_ag_asend_freelist_free++] = o;
+    } else {
+        __Pyx_PyHeapTypeObject_GC_Del(o);
+    }
+}
+
+static int
+__Pyx_async_gen_asend_traverse(__pyx_PyAsyncGenASend *o, visitproc visit, void *arg)
+{
+    Py_VISIT(o->ags_gen);
+    Py_VISIT(o->ags_sendval);
+    return 0;
+}
+
+
+static PyObject *
+__Pyx_async_gen_asend_send(PyObject *g, PyObject *arg)
+{
+    __pyx_PyAsyncGenASend *o = (__pyx_PyAsyncGenASend*) g;
+    PyObject *result;
+
+    if (unlikely(o->ags_state == __PYX_AWAITABLE_STATE_CLOSED)) {
+        PyErr_SetString(PyExc_RuntimeError, __Pyx_ASYNC_GEN_CANNOT_REUSE_SEND_MSG);
+        return NULL;
+    }
+
+    if (o->ags_state == __PYX_AWAITABLE_STATE_INIT) {
+        if (unlikely(o->ags_gen->ag_running_async)) {
+            PyErr_SetString(
+                PyExc_RuntimeError,
+                "anext(): asynchronous generator is already running");
+            return NULL;
+        }
+
+        if (arg == NULL || arg == Py_None) {
+            arg = o->ags_sendval ? o->ags_sendval : Py_None;
+        }
+        o->ags_state = __PYX_AWAITABLE_STATE_ITER;
+    }
+
+    o->ags_gen->ag_running_async = 1;
+    result = __Pyx_Coroutine_Send((PyObject*)o->ags_gen, arg);
+    result = __Pyx_async_gen_unwrap_value(o->ags_gen, result);
+
+    if (result == NULL) {
+        o->ags_state = __PYX_AWAITABLE_STATE_CLOSED;
+    }
+
+    return result;
+}
+
+
+static CYTHON_INLINE PyObject *
+__Pyx_async_gen_asend_iternext(PyObject *o)
+{
+    return __Pyx_async_gen_asend_send(o, Py_None);
+}
+
+
+static PyObject *
+__Pyx_async_gen_asend_throw(__pyx_PyAsyncGenASend *o, PyObject *args)
+{
+    PyObject *result;
+
+    if (unlikely(o->ags_state == __PYX_AWAITABLE_STATE_CLOSED)) {
+        PyErr_SetString(PyExc_RuntimeError, __Pyx_ASYNC_GEN_CANNOT_REUSE_SEND_MSG);
+        return NULL;
+    }
+
+    result = __Pyx_Coroutine_Throw((PyObject*)o->ags_gen, args);
+    result = __Pyx_async_gen_unwrap_value(o->ags_gen, result);
+
+    if (result == NULL) {
+        o->ags_state = __PYX_AWAITABLE_STATE_CLOSED;
+    }
+
+    return result;
+}
+
+
+static PyObject *
+__Pyx_async_gen_asend_close(PyObject *g, PyObject *args)
+{
+    __pyx_PyAsyncGenASend *o = (__pyx_PyAsyncGenASend*) g;
+    CYTHON_UNUSED_VAR(args);
+    o->ags_state = __PYX_AWAITABLE_STATE_CLOSED;
+    Py_RETURN_NONE;
+}
+
+
+static PyMethodDef __Pyx_async_gen_asend_methods[] = {
+    {"send", (PyCFunction)__Pyx_async_gen_asend_send, METH_O, __Pyx_async_gen_send_doc},
+    {"throw", (PyCFunction)__Pyx_async_gen_asend_throw, METH_VARARGS, __Pyx_async_gen_throw_doc},
+    {"close", (PyCFunction)__Pyx_async_gen_asend_close, METH_NOARGS, __Pyx_async_gen_close_doc},
+    {"__await__", (PyCFunction)__Pyx_async_gen_self_method, METH_NOARGS, __Pyx_async_gen_await_doc},
+    {0, 0, 0, 0}        /* Sentinel */
+};
+
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx__PyAsyncGenASendType_slots[] = {
+    {Py_tp_dealloc, (void *)__Pyx_async_gen_asend_dealloc},
+    {Py_am_await, (void *)PyObject_SelfIter},
+    {Py_tp_traverse, (void *)__Pyx_async_gen_asend_traverse},
+    {Py_tp_methods, (void *)__Pyx_async_gen_asend_methods},
+    {Py_tp_iter, (void *)PyObject_SelfIter},
+    {Py_tp_iternext, (void *)__Pyx_async_gen_asend_iternext},
+    {0, 0},
+};
+
+static PyType_Spec __pyx__PyAsyncGenASendType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "async_generator_asend",
+    sizeof(__pyx_PyAsyncGenASend),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+    __pyx__PyAsyncGenASendType_slots
+};
+#else /* CYTHON_USE_TYPE_SPECS */
+
+#if CYTHON_USE_ASYNC_SLOTS
+static __Pyx_PyAsyncMethodsStruct __Pyx_async_gen_asend_as_async = {
+    PyObject_SelfIter,                          /* am_await */
+    0,                                          /* am_aiter */
+    0,                                          /* am_anext */
+#if PY_VERSION_HEX >= 0x030A00A3
+    0, /*am_send*/
+#endif
+};
+#endif
+
+static PyTypeObject __pyx__PyAsyncGenASendType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    "async_generator_asend",                    /* tp_name */
+    sizeof(__pyx_PyAsyncGenASend),                    /* tp_basicsize */
+    0,                                          /* tp_itemsize */
+    /* methods */
+    (destructor)__Pyx_async_gen_asend_dealloc,        /* tp_dealloc */
+    0,                                          /* tp_vectorcall_offset */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+#if CYTHON_USE_ASYNC_SLOTS
+    &__Pyx_async_gen_asend_as_async,                  /* tp_as_async */
+#else
+    0,                                          /*tp_reserved*/
+#endif
+    0,                                          /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    0,                                          /* tp_str */
+    0,                                          /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,    /* tp_flags */
+    0,                                          /* tp_doc */
+    (traverseproc)__Pyx_async_gen_asend_traverse,  /* tp_traverse */
+    0,                                          /* tp_clear */
+#if CYTHON_USE_ASYNC_SLOTS && CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3 && PY_VERSION_HEX < 0x030500B1
+    // in order to (mis-)use tp_reserved above, we must also implement tp_richcompare
+    __Pyx_Coroutine_compare,            /*tp_richcompare*/
+#else
+    0,                                  /*tp_richcompare*/
+#endif
+    0,                                          /* tp_weaklistoffset */
+    PyObject_SelfIter,                          /* tp_iter */
+    (iternextfunc)__Pyx_async_gen_asend_iternext,     /* tp_iternext */
+    __Pyx_async_gen_asend_methods,                    /* tp_methods */
+    0,                                          /* tp_members */
+    0,                                          /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    0,                                          /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+    0,                                          /* tp_dictoffset */
+    0,                                          /* tp_init */
+    0,                                          /* tp_alloc */
+    0,                                          /* tp_new */
+    0,                                          /* tp_free */
+    0,                                          /* tp_is_gc */
+    0,                                          /* tp_bases */
+    0,                                          /* tp_mro */
+    0,                                          /* tp_cache */
+    0,                                          /* tp_subclasses */
+    0,                                          /* tp_weaklist */
+    0,                                          /* tp_del */
+    0,                                          /* tp_version_tag */
+#if PY_VERSION_HEX >= 0x030400a1
+    0,                                          /* tp_finalize */
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                          /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                          /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                          /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif /* CYTHON_USE_TYPE_SPECS */
+
+
+static PyObject *
+__Pyx_async_gen_asend_new(__pyx_PyAsyncGenObject *gen, PyObject *sendval)
+{
+    __pyx_PyAsyncGenASend *o;
+    if (likely(__Pyx_ag_asend_freelist_free)) {
+        __Pyx_ag_asend_freelist_free--;
+        o = __Pyx_ag_asend_freelist[__Pyx_ag_asend_freelist_free];
+        _Py_NewReference((PyObject *)o);
+    } else {
+        o = PyObject_GC_New(__pyx_PyAsyncGenASend, __pyx__PyAsyncGenASendType);
+        if (unlikely(o == NULL)) {
+            return NULL;
+        }
+    }
+
+    Py_INCREF(gen);
+    o->ags_gen = gen;
+
+    Py_XINCREF(sendval);
+    o->ags_sendval = sendval;
+
+    o->ags_state = __PYX_AWAITABLE_STATE_INIT;
+
+    PyObject_GC_Track((PyObject*)o);
+    return (PyObject*)o;
+}
+
+
+/* ---------- Async Generator Value Wrapper ------------ */
+
+
+static void
+__Pyx_async_gen_wrapped_val_dealloc(__pyx__PyAsyncGenWrappedValue *o)
+{
+    PyObject_GC_UnTrack((PyObject *)o);
+    Py_CLEAR(o->agw_val);
+    if (likely(__Pyx_ag_value_freelist_free < _PyAsyncGen_MAXFREELIST)) {
+        assert(__pyx__PyAsyncGenWrappedValue_CheckExact(o));
+        __Pyx_ag_value_freelist[__Pyx_ag_value_freelist_free++] = o;
+    } else {
+        __Pyx_PyHeapTypeObject_GC_Del(o);
+    }
+}
+
+
+static int
+__Pyx_async_gen_wrapped_val_traverse(__pyx__PyAsyncGenWrappedValue *o,
+                                     visitproc visit, void *arg)
+{
+    Py_VISIT(o->agw_val);
+    return 0;
+}
+
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx__PyAsyncGenWrappedValueType_slots[] = {
+    {Py_tp_dealloc, (void *)__Pyx_async_gen_wrapped_val_dealloc},
+    {Py_tp_traverse, (void *)__Pyx_async_gen_wrapped_val_traverse},
+    {0, 0},
+};
+
+static PyType_Spec __pyx__PyAsyncGenWrappedValueType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "async_generator_wrapped_value",
+    sizeof(__pyx__PyAsyncGenWrappedValue),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+    __pyx__PyAsyncGenWrappedValueType_slots
+};
+#else /* CYTHON_USE_TYPE_SPECS */
+
+static PyTypeObject __pyx__PyAsyncGenWrappedValueType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    "async_generator_wrapped_value",            /* tp_name */
+    sizeof(__pyx__PyAsyncGenWrappedValue),            /* tp_basicsize */
+    0,                                          /* tp_itemsize */
+    /* methods */
+    (destructor)__Pyx_async_gen_wrapped_val_dealloc,  /* tp_dealloc */
+    0,                                          /* tp_vectorcall_offset */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_as_async */
+    0,                                          /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    0,                                          /* tp_str */
+    0,                                          /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,    /* tp_flags */
+    0,                                          /* tp_doc */
+    (traverseproc)__Pyx_async_gen_wrapped_val_traverse,    /* tp_traverse */
+    0,                                          /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    0,                                          /* tp_members */
+    0,                                          /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    0,                                          /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+    0,                                          /* tp_dictoffset */
+    0,                                          /* tp_init */
+    0,                                          /* tp_alloc */
+    0,                                          /* tp_new */
+    0,                                          /* tp_free */
+    0,                                          /* tp_is_gc */
+    0,                                          /* tp_bases */
+    0,                                          /* tp_mro */
+    0,                                          /* tp_cache */
+    0,                                          /* tp_subclasses */
+    0,                                          /* tp_weaklist */
+    0,                                          /* tp_del */
+    0,                                          /* tp_version_tag */
+#if PY_VERSION_HEX >= 0x030400a1
+    0,                                          /* tp_finalize */
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                          /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                          /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                          /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif /* CYTHON_USE_TYPE_SPECS */
+
+
+static PyObject *
+__Pyx__PyAsyncGenValueWrapperNew(PyObject *val)
+{
+    // NOTE: steals a reference to val !
+    __pyx__PyAsyncGenWrappedValue *o;
+    assert(val);
+
+    if (likely(__Pyx_ag_value_freelist_free)) {
+        __Pyx_ag_value_freelist_free--;
+        o = __Pyx_ag_value_freelist[__Pyx_ag_value_freelist_free];
+        assert(__pyx__PyAsyncGenWrappedValue_CheckExact(o));
+        _Py_NewReference((PyObject*)o);
+    } else {
+        o = PyObject_GC_New(__pyx__PyAsyncGenWrappedValue, __pyx__PyAsyncGenWrappedValueType);
+        if (unlikely(!o)) {
+            Py_DECREF(val);
+            return NULL;
+        }
+    }
+    o->agw_val = val;
+    // no Py_INCREF(val) - steals reference!
+    PyObject_GC_Track((PyObject*)o);
+    return (PyObject*)o;
+}
+
+
+/* ---------- Async Generator AThrow awaitable ------------ */
+
+
+static void
+__Pyx_async_gen_athrow_dealloc(__pyx_PyAsyncGenAThrow *o)
+{
+    PyObject_GC_UnTrack((PyObject *)o);
+    Py_CLEAR(o->agt_gen);
+    Py_CLEAR(o->agt_args);
+    __Pyx_PyHeapTypeObject_GC_Del(o);
+}
+
+
+static int
+__Pyx_async_gen_athrow_traverse(__pyx_PyAsyncGenAThrow *o, visitproc visit, void *arg)
+{
+    Py_VISIT(o->agt_gen);
+    Py_VISIT(o->agt_args);
+    return 0;
+}
+
+
+static PyObject *
+__Pyx_async_gen_athrow_send(__pyx_PyAsyncGenAThrow *o, PyObject *arg)
+{
+    __pyx_CoroutineObject *gen = (__pyx_CoroutineObject*)o->agt_gen;
+    PyObject *retval, *exc_type;
+
+    if (unlikely(o->agt_state == __PYX_AWAITABLE_STATE_CLOSED)) {
+        PyErr_SetString(PyExc_RuntimeError, __Pyx_ASYNC_GEN_CANNOT_REUSE_CLOSE_MSG);
+        return NULL;
+    }
+
+    if (unlikely(gen->resume_label == -1)) {
+        // already run past the end
+        o->agt_state = __PYX_AWAITABLE_STATE_CLOSED;
+        PyErr_SetNone(PyExc_StopIteration);
+        return NULL;
+    }
+
+    if (o->agt_state == __PYX_AWAITABLE_STATE_INIT) {
+        if (unlikely(o->agt_gen->ag_running_async)) {
+            o->agt_state = __PYX_AWAITABLE_STATE_CLOSED;
+            if (o->agt_args == NULL) {
+                PyErr_SetString(
+                    PyExc_RuntimeError,
+                    "aclose(): asynchronous generator is already running");
+            } else {
+                PyErr_SetString(
+                    PyExc_RuntimeError,
+                    "athrow(): asynchronous generator is already running");
+            }
+            return NULL;
+        }
+
+        if (unlikely(o->agt_gen->ag_closed)) {
+            o->agt_state = __PYX_AWAITABLE_STATE_CLOSED;
+            PyErr_SetNone(__Pyx_PyExc_StopAsyncIteration);
+            return NULL;
+        }
+
+        if (unlikely(arg != Py_None)) {
+            PyErr_SetString(PyExc_RuntimeError, __Pyx_NON_INIT_CORO_MSG);
+            return NULL;
+        }
+
+        o->agt_state = __PYX_AWAITABLE_STATE_ITER;
+        o->agt_gen->ag_running_async = 1;
+
+        if (o->agt_args == NULL) {
+            /* aclose() mode */
+            o->agt_gen->ag_closed = 1;
+
+            retval = __Pyx__Coroutine_Throw((PyObject*)gen,
+                /* Do not close generator when PyExc_GeneratorExit is passed */
+                PyExc_GeneratorExit, NULL, NULL, NULL, 0);
+
+            if (retval && __pyx__PyAsyncGenWrappedValue_CheckExact(retval)) {
+                Py_DECREF(retval);
+                goto yield_close;
+            }
+        } else {
+            PyObject *typ;
+            PyObject *tb = NULL;
+            PyObject *val = NULL;
+
+            if (unlikely(!PyArg_UnpackTuple(o->agt_args, "athrow", 1, 3, &typ, &val, &tb))) {
+                return NULL;
+            }
+
+            retval = __Pyx__Coroutine_Throw((PyObject*)gen,
+                /* Do not close generator when PyExc_GeneratorExit is passed */
+                typ, val, tb, o->agt_args, 0);
+            retval = __Pyx_async_gen_unwrap_value(o->agt_gen, retval);
+        }
+        if (retval == NULL) {
+            goto check_error;
+        }
+        return retval;
+    }
+
+    assert (o->agt_state == __PYX_AWAITABLE_STATE_ITER);
+
+    retval = __Pyx_Coroutine_Send((PyObject *)gen, arg);
+    if (o->agt_args) {
+        return __Pyx_async_gen_unwrap_value(o->agt_gen, retval);
+    } else {
+        /* aclose() mode */
+        if (retval) {
+            if (unlikely(__pyx__PyAsyncGenWrappedValue_CheckExact(retval))) {
+                Py_DECREF(retval);
+                goto yield_close;
+            }
+            else {
+                return retval;
+            }
+        }
+        else {
+            goto check_error;
+        }
+    }
+
+yield_close:
+    o->agt_gen->ag_running_async = 0;
+    o->agt_state = __PYX_AWAITABLE_STATE_CLOSED;
+    PyErr_SetString(
+        PyExc_RuntimeError, __Pyx_ASYNC_GEN_IGNORED_EXIT_MSG);
+    return NULL;
+
+check_error:
+    o->agt_gen->ag_running_async = 0;
+    o->agt_state = __PYX_AWAITABLE_STATE_CLOSED;
+    exc_type = PyErr_Occurred();
+    if (__Pyx_PyErr_GivenExceptionMatches2(exc_type, __Pyx_PyExc_StopAsyncIteration, PyExc_GeneratorExit)) {
+        if (o->agt_args == NULL) {
+            // when aclose() is called we don't want to propagate
+            // StopAsyncIteration or GeneratorExit; just raise
+            // StopIteration, signalling that this 'aclose()' await
+            // is done.
+            PyErr_Clear();
+            PyErr_SetNone(PyExc_StopIteration);
+        }
+    }
+    return NULL;
+}
+
+
+static PyObject *
+__Pyx_async_gen_athrow_throw(__pyx_PyAsyncGenAThrow *o, PyObject *args)
+{
+    PyObject *retval;
+
+    if (unlikely(o->agt_state == __PYX_AWAITABLE_STATE_CLOSED)) {
+        PyErr_SetString(PyExc_RuntimeError, __Pyx_ASYNC_GEN_CANNOT_REUSE_CLOSE_MSG);
+        return NULL;
+    }
+
+    retval = __Pyx_Coroutine_Throw((PyObject*)o->agt_gen, args);
+    if (o->agt_args) {
+        return __Pyx_async_gen_unwrap_value(o->agt_gen, retval);
+    } else {
+        // aclose() mode
+        PyObject *exc_type;
+        if (unlikely(retval && __pyx__PyAsyncGenWrappedValue_CheckExact(retval))) {
+            o->agt_gen->ag_running_async = 0;
+            o->agt_state = __PYX_AWAITABLE_STATE_CLOSED;
+            Py_DECREF(retval);
+            PyErr_SetString(PyExc_RuntimeError, __Pyx_ASYNC_GEN_IGNORED_EXIT_MSG);
+            return NULL;
+        }
+        exc_type = PyErr_Occurred();
+        if (__Pyx_PyErr_GivenExceptionMatches2(exc_type, __Pyx_PyExc_StopAsyncIteration, PyExc_GeneratorExit)) {
+            // when aclose() is called we don't want to propagate
+            // StopAsyncIteration or GeneratorExit; just raise
+            // StopIteration, signalling that this 'aclose()' await
+            // is done.
+            PyErr_Clear();
+            PyErr_SetNone(PyExc_StopIteration);
+        }
+        return retval;
+    }
+}
+
+
+static PyObject *
+__Pyx_async_gen_athrow_iternext(__pyx_PyAsyncGenAThrow *o)
+{
+    return __Pyx_async_gen_athrow_send(o, Py_None);
+}
+
+
+static PyObject *
+__Pyx_async_gen_athrow_close(PyObject *g, PyObject *args)
+{
+    __pyx_PyAsyncGenAThrow *o = (__pyx_PyAsyncGenAThrow*) g;
+    CYTHON_UNUSED_VAR(args);
+    o->agt_state = __PYX_AWAITABLE_STATE_CLOSED;
+    Py_RETURN_NONE;
+}
+
+
+static PyMethodDef __Pyx_async_gen_athrow_methods[] = {
+    {"send", (PyCFunction)__Pyx_async_gen_athrow_send, METH_O, __Pyx_async_gen_send_doc},
+    {"throw", (PyCFunction)__Pyx_async_gen_athrow_throw, METH_VARARGS, __Pyx_async_gen_throw_doc},
+    {"close", (PyCFunction)__Pyx_async_gen_athrow_close, METH_NOARGS, __Pyx_async_gen_close_doc},
+    {"__await__", (PyCFunction)__Pyx_async_gen_self_method, METH_NOARGS, __Pyx_async_gen_await_doc},
+    {0, 0, 0, 0}        /* Sentinel */
+};
+
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx__PyAsyncGenAThrowType_slots[] = {
+    {Py_tp_dealloc, (void *)__Pyx_async_gen_athrow_dealloc},
+    {Py_am_await, (void *)PyObject_SelfIter},
+    {Py_tp_traverse, (void *)__Pyx_async_gen_athrow_traverse},
+    {Py_tp_iter, (void *)PyObject_SelfIter},
+    {Py_tp_iternext, (void *)__Pyx_async_gen_athrow_iternext},
+    {Py_tp_methods, (void *)__Pyx_async_gen_athrow_methods},
+    {Py_tp_getattro, (void *)__Pyx_PyObject_GenericGetAttrNoDict},
+    {0, 0},
+};
+
+static PyType_Spec __pyx__PyAsyncGenAThrowType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "async_generator_athrow",
+    sizeof(__pyx_PyAsyncGenAThrow),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+    __pyx__PyAsyncGenAThrowType_slots
+};
+#else /* CYTHON_USE_TYPE_SPECS */
+
+#if CYTHON_USE_ASYNC_SLOTS
+static __Pyx_PyAsyncMethodsStruct __Pyx_async_gen_athrow_as_async = {
+    PyObject_SelfIter,                          /* am_await */
+    0,                                          /* am_aiter */
+    0,                                          /* am_anext */
+#if PY_VERSION_HEX >= 0x030A00A3
+    0, /*am_send*/
+#endif
+};
+#endif
+
+static PyTypeObject __pyx__PyAsyncGenAThrowType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    "async_generator_athrow",                   /* tp_name */
+    sizeof(__pyx_PyAsyncGenAThrow),                   /* tp_basicsize */
+    0,                                          /* tp_itemsize */
+    (destructor)__Pyx_async_gen_athrow_dealloc,       /* tp_dealloc */
+    0,                                          /* tp_vectorcall_offset */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+#if CYTHON_USE_ASYNC_SLOTS
+    &__Pyx_async_gen_athrow_as_async,                 /* tp_as_async */
+#else
+    0,                                          /*tp_reserved*/
+#endif
+    0,                                          /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    0,                                          /* tp_str */
+    0,                                          /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,    /* tp_flags */
+    0,                                          /* tp_doc */
+    (traverseproc)__Pyx_async_gen_athrow_traverse,    /* tp_traverse */
+    0,                                          /* tp_clear */
+#if CYTHON_USE_ASYNC_SLOTS && CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3 && PY_VERSION_HEX < 0x030500B1
+    // in order to (mis-)use tp_reserved above, we must also implement tp_richcompare
+    __Pyx_Coroutine_compare,            /*tp_richcompare*/
+#else
+    0,                                  /*tp_richcompare*/
+#endif
+    0,                                          /* tp_weaklistoffset */
+    PyObject_SelfIter,                          /* tp_iter */
+    (iternextfunc)__Pyx_async_gen_athrow_iternext,    /* tp_iternext */
+    __Pyx_async_gen_athrow_methods,                   /* tp_methods */
+    0,                                          /* tp_members */
+    0,                                          /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    0,                                          /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+    0,                                          /* tp_dictoffset */
+    0,                                          /* tp_init */
+    0,                                          /* tp_alloc */
+    0,                                          /* tp_new */
+    0,                                          /* tp_free */
+    0,                                          /* tp_is_gc */
+    0,                                          /* tp_bases */
+    0,                                          /* tp_mro */
+    0,                                          /* tp_cache */
+    0,                                          /* tp_subclasses */
+    0,                                          /* tp_weaklist */
+    0,                                          /* tp_del */
+    0,                                          /* tp_version_tag */
+#if PY_VERSION_HEX >= 0x030400a1
+    0,                                          /* tp_finalize */
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                          /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                          /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                          /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif /* CYTHON_USE_TYPE_SPECS */
+
+
+static PyObject *
+__Pyx_async_gen_athrow_new(__pyx_PyAsyncGenObject *gen, PyObject *args)
+{
+    __pyx_PyAsyncGenAThrow *o;
+    o = PyObject_GC_New(__pyx_PyAsyncGenAThrow, __pyx__PyAsyncGenAThrowType);
+    if (unlikely(o == NULL)) {
+        return NULL;
+    }
+    o->agt_gen = gen;
+    o->agt_args = args;
+    o->agt_state = __PYX_AWAITABLE_STATE_INIT;
+    Py_INCREF(gen);
+    Py_XINCREF(args);
+    PyObject_GC_Track((PyObject*)o);
+    return (PyObject*)o;
+}
+
+
+/* ---------- global type sharing ------------ */
+
+static int __pyx_AsyncGen_init(PyObject *module) {
+#if CYTHON_USE_TYPE_SPECS
+    __pyx_AsyncGenType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx_AsyncGenType_spec, NULL);
+#else
+    CYTHON_MAYBE_UNUSED_VAR(module);
+    // on Windows, C-API functions can't be used in slots statically
+    __pyx_AsyncGenType_type.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
+    __pyx_AsyncGenType = __Pyx_FetchCommonType(&__pyx_AsyncGenType_type);
+#endif
+    if (unlikely(!__pyx_AsyncGenType))
+        return -1;
+
+#if CYTHON_USE_TYPE_SPECS
+    __pyx__PyAsyncGenAThrowType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx__PyAsyncGenAThrowType_spec, NULL);
+#else
+    __pyx__PyAsyncGenAThrowType_type.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
+    __pyx__PyAsyncGenAThrowType = __Pyx_FetchCommonType(&__pyx__PyAsyncGenAThrowType_type);
+#endif
+    if (unlikely(!__pyx__PyAsyncGenAThrowType))
+        return -1;
+
+#if CYTHON_USE_TYPE_SPECS
+    __pyx__PyAsyncGenWrappedValueType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx__PyAsyncGenWrappedValueType_spec, NULL);
+#else
+    __pyx__PyAsyncGenWrappedValueType_type.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
+    __pyx__PyAsyncGenWrappedValueType = __Pyx_FetchCommonType(&__pyx__PyAsyncGenWrappedValueType_type);
+#endif
+    if (unlikely(!__pyx__PyAsyncGenWrappedValueType))
+        return -1;
+
+#if CYTHON_USE_TYPE_SPECS
+    __pyx__PyAsyncGenASendType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx__PyAsyncGenASendType_spec, NULL);
+#else
+    __pyx__PyAsyncGenASendType_type.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
+    __pyx__PyAsyncGenASendType = __Pyx_FetchCommonType(&__pyx__PyAsyncGenASendType_type);
+#endif
+    if (unlikely(!__pyx__PyAsyncGenASendType))
+        return -1;
+
+    return 0;
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/Buffer.c b/contrib/tools/cython_py2/Cython/Utility/Buffer.c
new file mode 100644
index 00000000000..5289a6b5591
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Buffer.c
@@ -0,0 +1,933 @@
+/////////////// BufferStructDeclare.proto ///////////////
+
+/* structs for buffer access */
+
+typedef struct {
+  Py_ssize_t shape, strides, suboffsets;
+} __Pyx_Buf_DimInfo;
+
+typedef struct {
+  size_t refcount;
+  Py_buffer pybuffer;
+} __Pyx_Buffer;
+
+typedef struct {
+  __Pyx_Buffer *rcbuffer;
+  char *data;
+  __Pyx_Buf_DimInfo diminfo[{{max_dims}}];
+} __Pyx_LocalBuf_ND;
+
+/////////////// BufferIndexError.proto ///////////////
+static void __Pyx_RaiseBufferIndexError(int axis); /*proto*/
+
+/////////////// BufferIndexError ///////////////
+static void __Pyx_RaiseBufferIndexError(int axis) {
+  PyErr_Format(PyExc_IndexError,
+     "Out of bounds on buffer access (axis %d)", axis);
+}
+
+/////////////// BufferIndexErrorNogil.proto ///////////////
+//@requires: BufferIndexError
+
+static void __Pyx_RaiseBufferIndexErrorNogil(int axis); /*proto*/
+
+/////////////// BufferIndexErrorNogil ///////////////
+static void __Pyx_RaiseBufferIndexErrorNogil(int axis) {
+    #ifdef WITH_THREAD
+    PyGILState_STATE gilstate = PyGILState_Ensure();
+    #endif
+    __Pyx_RaiseBufferIndexError(axis);
+    #ifdef WITH_THREAD
+    PyGILState_Release(gilstate);
+    #endif
+}
+
+/////////////// BufferFallbackError.proto ///////////////
+static void __Pyx_RaiseBufferFallbackError(void); /*proto*/
+
+/////////////// BufferFallbackError ///////////////
+static void __Pyx_RaiseBufferFallbackError(void) {
+  PyErr_SetString(PyExc_ValueError,
+     "Buffer acquisition failed on assignment; and then reacquiring the old buffer failed too!");
+}
+
+/////////////// BufferFormatStructs.proto ///////////////
+//@proto_block: utility_code_proto_before_types
+
+/* Run-time type information about structs used with buffers */
+struct __Pyx_StructField_;
+
+#define __PYX_BUF_FLAGS_PACKED_STRUCT (1 << 0)
+
+typedef struct {
+  const char* name; /* for error messages only */
+  struct __Pyx_StructField_* fields;
+  size_t size;     /* sizeof(type) */
+  size_t arraysize[8]; /* length of array in each dimension */
+  int ndim;
+  char typegroup; /* _R_eal, _C_omplex, Signed _I_nt, _U_nsigned int, _S_truct, _P_ointer, _O_bject, c_H_ar */
+  char is_unsigned;
+  int flags;
+} __Pyx_TypeInfo;
+
+typedef struct __Pyx_StructField_ {
+  __Pyx_TypeInfo* type;
+  const char* name;
+  size_t offset;
+} __Pyx_StructField;
+
+typedef struct {
+  __Pyx_StructField* field;
+  size_t parent_offset;
+} __Pyx_BufFmt_StackElem;
+
+typedef struct {
+  __Pyx_StructField root;
+  __Pyx_BufFmt_StackElem* head;
+  size_t fmt_offset;
+  size_t new_count, enc_count;
+  size_t struct_alignment;
+  int is_complex;
+  char enc_type;
+  char new_packmode;
+  char enc_packmode;
+  char is_valid_array;
+} __Pyx_BufFmt_Context;
+
+
+/////////////// GetAndReleaseBuffer.proto ///////////////
+
+#if PY_MAJOR_VERSION < 3
+    static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags);
+    static void __Pyx_ReleaseBuffer(Py_buffer *view);
+#else
+    #define __Pyx_GetBuffer PyObject_GetBuffer
+    #define __Pyx_ReleaseBuffer PyBuffer_Release
+#endif
+
+/////////////// GetAndReleaseBuffer ///////////////
+
+#if PY_MAJOR_VERSION < 3
+static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags) {
+    __Pyx_TypeName obj_type_name;
+    if (PyObject_CheckBuffer(obj)) return PyObject_GetBuffer(obj, view, flags);
+
+    {{for type_ptr, getbuffer, releasebuffer in types}}
+      {{if getbuffer}}
+        if (__Pyx_TypeCheck(obj, {{type_ptr}})) return {{getbuffer}}(obj, view, flags);
+      {{endif}}
+    {{endfor}}
+
+    obj_type_name = __Pyx_PyType_GetName(Py_TYPE(obj));
+    PyErr_Format(PyExc_TypeError,
+                 "'" __Pyx_FMT_TYPENAME "' does not have the buffer interface",
+                 obj_type_name);
+    __Pyx_DECREF_TypeName(obj_type_name);
+    return -1;
+}
+
+static void __Pyx_ReleaseBuffer(Py_buffer *view) {
+    PyObject *obj = view->obj;
+    if (!obj) return;
+
+    if (PyObject_CheckBuffer(obj)) {
+        PyBuffer_Release(view);
+        return;
+    }
+
+    if ((0)) {}
+    {{for type_ptr, getbuffer, releasebuffer in types}}
+      {{if releasebuffer}}
+        else if (__Pyx_TypeCheck(obj, {{type_ptr}})) {{releasebuffer}}(obj, view);
+      {{endif}}
+    {{endfor}}
+
+    view->obj = NULL;
+    Py_DECREF(obj);
+}
+
+#endif /*  PY_MAJOR_VERSION < 3 */
+
+
+/////////////// BufferGetAndValidate.proto ///////////////
+
+#define __Pyx_GetBufferAndValidate(buf, obj, dtype, flags, nd, cast, stack) \
+    ((obj == Py_None || obj == NULL) ? \
+    (__Pyx_ZeroBuffer(buf), 0) : \
+    __Pyx__GetBufferAndValidate(buf, obj, dtype, flags, nd, cast, stack))
+
+static int  __Pyx__GetBufferAndValidate(Py_buffer* buf, PyObject* obj,
+    __Pyx_TypeInfo* dtype, int flags, int nd, int cast, __Pyx_BufFmt_StackElem* stack);
+static void __Pyx_ZeroBuffer(Py_buffer* buf);
+static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info);/*proto*/
+
+static Py_ssize_t __Pyx_minusones[] = { {{ ", ".join(["-1"] * max_dims) }} };
+static Py_ssize_t __Pyx_zeros[] = { {{ ", ".join(["0"] * max_dims) }} };
+
+
+/////////////// BufferGetAndValidate ///////////////
+//@requires: BufferFormatCheck
+
+static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info) {
+  if (unlikely(info->buf == NULL)) return;
+  if (info->suboffsets == __Pyx_minusones) info->suboffsets = NULL;
+  __Pyx_ReleaseBuffer(info);
+}
+
+static void __Pyx_ZeroBuffer(Py_buffer* buf) {
+  buf->buf = NULL;
+  buf->obj = NULL;
+  buf->strides = __Pyx_zeros;
+  buf->shape = __Pyx_zeros;
+  buf->suboffsets = __Pyx_minusones;
+}
+
+static int __Pyx__GetBufferAndValidate(
+        Py_buffer* buf, PyObject* obj,  __Pyx_TypeInfo* dtype, int flags,
+        int nd, int cast, __Pyx_BufFmt_StackElem* stack)
+{
+  buf->buf = NULL;
+  if (unlikely(__Pyx_GetBuffer(obj, buf, flags) == -1)) {
+    __Pyx_ZeroBuffer(buf);
+    return -1;
+  }
+  // From this point on, we have acquired the buffer and must release it on errors.
+  if (unlikely(buf->ndim != nd)) {
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer has wrong number of dimensions (expected %d, got %d)",
+                 nd, buf->ndim);
+    goto fail;
+  }
+  if (!cast) {
+    __Pyx_BufFmt_Context ctx;
+    __Pyx_BufFmt_Init(&ctx, stack, dtype);
+    if (!__Pyx_BufFmt_CheckString(&ctx, buf->format)) goto fail;
+  }
+  if (unlikely((size_t)buf->itemsize != dtype->size)) {
+    PyErr_Format(PyExc_ValueError,
+      "Item size of buffer (%" CYTHON_FORMAT_SSIZE_T "d byte%s) does not match size of '%s' (%" CYTHON_FORMAT_SSIZE_T "d byte%s)",
+      buf->itemsize, (buf->itemsize > 1) ? "s" : "",
+      dtype->name, (Py_ssize_t)dtype->size, (dtype->size > 1) ? "s" : "");
+    goto fail;
+  }
+  if (buf->suboffsets == NULL) buf->suboffsets = __Pyx_minusones;
+  return 0;
+fail:;
+  __Pyx_SafeReleaseBuffer(buf);
+  return -1;
+}
+
+
+/////////////// BufferFormatCheck.proto ///////////////
+
+//  Buffer format string checking
+//
+//  Buffer type checking. Utility code for checking that acquired
+//  buffers match our assumptions. We only need to check ndim and
+//  the format string; the access mode/flags is checked by the
+//  exporter. See:
+//
+//  https://docs.python.org/3/library/struct.html
+//  https://www.python.org/dev/peps/pep-3118/#additions-to-the-struct-string-syntax
+//
+//  The alignment code is copied from _struct.c in Python.
+
+static const char* __Pyx_BufFmt_CheckString(__Pyx_BufFmt_Context* ctx, const char* ts);
+static void __Pyx_BufFmt_Init(__Pyx_BufFmt_Context* ctx,
+                              __Pyx_BufFmt_StackElem* stack,
+                              __Pyx_TypeInfo* type); /*proto*/
+
+/////////////// BufferFormatCheck ///////////////
+//@requires: ModuleSetupCode.c::IsLittleEndian
+//@requires: BufferFormatStructs
+
+static void __Pyx_BufFmt_Init(__Pyx_BufFmt_Context* ctx,
+                              __Pyx_BufFmt_StackElem* stack,
+                              __Pyx_TypeInfo* type) {
+  stack[0].field = &ctx->root;
+  stack[0].parent_offset = 0;
+  ctx->root.type = type;
+  ctx->root.name = "buffer dtype";
+  ctx->root.offset = 0;
+  ctx->head = stack;
+  ctx->head->field = &ctx->root;
+  ctx->fmt_offset = 0;
+  ctx->head->parent_offset = 0;
+  ctx->new_packmode = '@';
+  ctx->enc_packmode = '@';
+  ctx->new_count = 1;
+  ctx->enc_count = 0;
+  ctx->enc_type = 0;
+  ctx->is_complex = 0;
+  ctx->is_valid_array = 0;
+  ctx->struct_alignment = 0;
+  while (type->typegroup == 'S') {
+    ++ctx->head;
+    ctx->head->field = type->fields;
+    ctx->head->parent_offset = 0;
+    type = type->fields->type;
+  }
+}
+
+static int __Pyx_BufFmt_ParseNumber(const char** ts) {
+    int count;
+    const char* t = *ts;
+    if (*t < '0' || *t > '9') {
+      return -1;
+    } else {
+        count = *t++ - '0';
+        while (*t >= '0' && *t <= '9') {
+            count *= 10;
+            count += *t++ - '0';
+        }
+    }
+    *ts = t;
+    return count;
+}
+
+static int __Pyx_BufFmt_ExpectNumber(const char **ts) {
+    int number = __Pyx_BufFmt_ParseNumber(ts);
+    if (number == -1) /* First char was not a digit */
+        PyErr_Format(PyExc_ValueError,\
+                     "Does not understand character buffer dtype format string ('%c')", **ts);
+    return number;
+}
+
+
+static void __Pyx_BufFmt_RaiseUnexpectedChar(char ch) {
+  PyErr_Format(PyExc_ValueError,
+               "Unexpected format string character: '%c'", ch);
+}
+
+static const char* __Pyx_BufFmt_DescribeTypeChar(char ch, int is_complex) {
+  switch (ch) {
+    case '?': return "'bool'";
+    case 'c': return "'char'";
+    case 'b': return "'signed char'";
+    case 'B': return "'unsigned char'";
+    case 'h': return "'short'";
+    case 'H': return "'unsigned short'";
+    case 'i': return "'int'";
+    case 'I': return "'unsigned int'";
+    case 'l': return "'long'";
+    case 'L': return "'unsigned long'";
+    case 'q': return "'long long'";
+    case 'Q': return "'unsigned long long'";
+    case 'f': return (is_complex ? "'complex float'" : "'float'");
+    case 'd': return (is_complex ? "'complex double'" : "'double'");
+    case 'g': return (is_complex ? "'complex long double'" : "'long double'");
+    case 'T': return "a struct";
+    case 'O': return "Python object";
+    case 'P': return "a pointer";
+    case 's': case 'p': return "a string";
+    case 0: return "end";
+    default: return "unparsable format string";
+  }
+}
+
+static size_t __Pyx_BufFmt_TypeCharToStandardSize(char ch, int is_complex) {
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': case 's': case 'p': return 1;
+    case 'h': case 'H': return 2;
+    case 'i': case 'I': case 'l': case 'L': return 4;
+    case 'q': case 'Q': return 8;
+    case 'f': return (is_complex ? 8 : 4);
+    case 'd': return (is_complex ? 16 : 8);
+    case 'g': {
+      PyErr_SetString(PyExc_ValueError, "Python does not define a standard format string size for long double ('g')..");
+      return 0;
+    }
+    case 'O': case 'P': return sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+
+static size_t __Pyx_BufFmt_TypeCharToNativeSize(char ch, int is_complex) {
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': case 's': case 'p': return 1;
+    case 'h': case 'H': return sizeof(short);
+    case 'i': case 'I': return sizeof(int);
+    case 'l': case 'L': return sizeof(long);
+    #ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(PY_LONG_LONG);
+    #endif
+    case 'f': return sizeof(float) * (is_complex ? 2 : 1);
+    case 'd': return sizeof(double) * (is_complex ? 2 : 1);
+    case 'g': return sizeof(long double) * (is_complex ? 2 : 1);
+    case 'O': case 'P': return sizeof(void*);
+    default: {
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+  }
+}
+
+typedef struct { char c; short x; } __Pyx_st_short;
+typedef struct { char c; int x; } __Pyx_st_int;
+typedef struct { char c; long x; } __Pyx_st_long;
+typedef struct { char c; float x; } __Pyx_st_float;
+typedef struct { char c; double x; } __Pyx_st_double;
+typedef struct { char c; long double x; } __Pyx_st_longdouble;
+typedef struct { char c; void *x; } __Pyx_st_void_p;
+#ifdef HAVE_LONG_LONG
+typedef struct { char c; PY_LONG_LONG x; } __Pyx_st_longlong;
+#endif
+
+static size_t __Pyx_BufFmt_TypeCharToAlignment(char ch, int is_complex) {
+  CYTHON_UNUSED_VAR(is_complex);
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': case 's': case 'p': return 1;
+    case 'h': case 'H': return sizeof(__Pyx_st_short) - sizeof(short);
+    case 'i': case 'I': return sizeof(__Pyx_st_int) - sizeof(int);
+    case 'l': case 'L': return sizeof(__Pyx_st_long) - sizeof(long);
+#ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(__Pyx_st_longlong) - sizeof(PY_LONG_LONG);
+#endif
+    case 'f': return sizeof(__Pyx_st_float) - sizeof(float);
+    case 'd': return sizeof(__Pyx_st_double) - sizeof(double);
+    case 'g': return sizeof(__Pyx_st_longdouble) - sizeof(long double);
+    case 'P': case 'O': return sizeof(__Pyx_st_void_p) - sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+
+/* These are for computing the padding at the end of the struct to align
+   on the first member of the struct. This will probably the same as above,
+   but we don't have any guarantees.
+ */
+typedef struct { short x; char c; } __Pyx_pad_short;
+typedef struct { int x; char c; } __Pyx_pad_int;
+typedef struct { long x; char c; } __Pyx_pad_long;
+typedef struct { float x; char c; } __Pyx_pad_float;
+typedef struct { double x; char c; } __Pyx_pad_double;
+typedef struct { long double x; char c; } __Pyx_pad_longdouble;
+typedef struct { void *x; char c; } __Pyx_pad_void_p;
+#ifdef HAVE_LONG_LONG
+typedef struct { PY_LONG_LONG x; char c; } __Pyx_pad_longlong;
+#endif
+
+static size_t __Pyx_BufFmt_TypeCharToPadding(char ch, int is_complex) {
+  CYTHON_UNUSED_VAR(is_complex);
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': case 's': case 'p': return 1;
+    case 'h': case 'H': return sizeof(__Pyx_pad_short) - sizeof(short);
+    case 'i': case 'I': return sizeof(__Pyx_pad_int) - sizeof(int);
+    case 'l': case 'L': return sizeof(__Pyx_pad_long) - sizeof(long);
+#ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(__Pyx_pad_longlong) - sizeof(PY_LONG_LONG);
+#endif
+    case 'f': return sizeof(__Pyx_pad_float) - sizeof(float);
+    case 'd': return sizeof(__Pyx_pad_double) - sizeof(double);
+    case 'g': return sizeof(__Pyx_pad_longdouble) - sizeof(long double);
+    case 'P': case 'O': return sizeof(__Pyx_pad_void_p) - sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+
+static char __Pyx_BufFmt_TypeCharToGroup(char ch, int is_complex) {
+  switch (ch) {
+    case 'c':
+        return 'H';
+    case 'b': case 'h': case 'i':
+    case 'l': case 'q': case 's': case 'p':
+        return 'I';
+    case '?': case 'B': case 'H': case 'I': case 'L': case 'Q':
+        return 'U';
+    case 'f': case 'd': case 'g':
+        return (is_complex ? 'C' : 'R');
+    case 'O':
+        return 'O';
+    case 'P':
+        return 'P';
+    default: {
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+  }
+}
+
+
+static void __Pyx_BufFmt_RaiseExpected(__Pyx_BufFmt_Context* ctx) {
+  if (ctx->head == NULL || ctx->head->field == &ctx->root) {
+    const char* expected;
+    const char* quote;
+    if (ctx->head == NULL) {
+      expected = "end";
+      quote = "";
+    } else {
+      expected = ctx->head->field->type->name;
+      quote = "'";
+    }
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer dtype mismatch, expected %s%s%s but got %s",
+                 quote, expected, quote,
+                 __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex));
+  } else {
+    __Pyx_StructField* field = ctx->head->field;
+    __Pyx_StructField* parent = (ctx->head - 1)->field;
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer dtype mismatch, expected '%s' but got %s in '%s.%s'",
+                 field->type->name, __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex),
+                 parent->type->name, field->name);
+  }
+}
+
+static int __Pyx_BufFmt_ProcessTypeChunk(__Pyx_BufFmt_Context* ctx) {
+  char group;
+  size_t size, offset, arraysize = 1;
+
+  /* printf("processing... %s\n", ctx->head->field->type->name); */
+
+  if (ctx->enc_type == 0) return 0;
+
+  /* Validate array size */
+  if (ctx->head->field->type->arraysize[0]) {
+    int i, ndim = 0;
+
+    /* handle strings ('s' and 'p') */
+    if (ctx->enc_type == 's' || ctx->enc_type == 'p') {
+        ctx->is_valid_array = ctx->head->field->type->ndim == 1;
+        ndim = 1;
+        if (ctx->enc_count != ctx->head->field->type->arraysize[0]) {
+            PyErr_Format(PyExc_ValueError,
+                         "Expected a dimension of size %zu, got %zu",
+                         ctx->head->field->type->arraysize[0], ctx->enc_count);
+            return -1;
+        }
+    }
+
+    if (!ctx->is_valid_array) {
+      PyErr_Format(PyExc_ValueError, "Expected %d dimensions, got %d",
+                   ctx->head->field->type->ndim, ndim);
+      return -1;
+    }
+    for (i = 0; i < ctx->head->field->type->ndim; i++) {
+      arraysize *= ctx->head->field->type->arraysize[i];
+    }
+    ctx->is_valid_array = 0;
+    ctx->enc_count = 1;
+  }
+
+  group = __Pyx_BufFmt_TypeCharToGroup(ctx->enc_type, ctx->is_complex);
+  do {
+    __Pyx_StructField* field = ctx->head->field;
+    __Pyx_TypeInfo* type = field->type;
+
+    if (ctx->enc_packmode == '@' || ctx->enc_packmode == '^') {
+      size = __Pyx_BufFmt_TypeCharToNativeSize(ctx->enc_type, ctx->is_complex);
+    } else {
+      size = __Pyx_BufFmt_TypeCharToStandardSize(ctx->enc_type, ctx->is_complex);
+    }
+
+    if (ctx->enc_packmode == '@') {
+      size_t align_at = __Pyx_BufFmt_TypeCharToAlignment(ctx->enc_type, ctx->is_complex);
+      size_t align_mod_offset;
+      if (align_at == 0) return -1;
+      align_mod_offset = ctx->fmt_offset % align_at;
+      if (align_mod_offset > 0) ctx->fmt_offset += align_at - align_mod_offset;
+
+      if (ctx->struct_alignment == 0)
+          ctx->struct_alignment = __Pyx_BufFmt_TypeCharToPadding(ctx->enc_type,
+                                                                 ctx->is_complex);
+    }
+
+    if (type->size != size || type->typegroup != group) {
+      if (type->typegroup == 'C' && type->fields != NULL) {
+        /* special case -- treat as struct rather than complex number */
+        size_t parent_offset = ctx->head->parent_offset + field->offset;
+        ++ctx->head;
+        ctx->head->field = type->fields;
+        ctx->head->parent_offset = parent_offset;
+        continue;
+      }
+
+      if ((type->typegroup == 'H' || group == 'H') && type->size == size) {
+          /* special case -- chars don't care about sign */
+      } else {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return -1;
+      }
+    }
+
+    offset = ctx->head->parent_offset + field->offset;
+    if (ctx->fmt_offset != offset) {
+      PyErr_Format(PyExc_ValueError,
+                   "Buffer dtype mismatch; next field is at offset %" CYTHON_FORMAT_SSIZE_T "d but %" CYTHON_FORMAT_SSIZE_T "d expected",
+                   (Py_ssize_t)ctx->fmt_offset, (Py_ssize_t)offset);
+      return -1;
+    }
+
+    ctx->fmt_offset += size;
+    if (arraysize)
+      ctx->fmt_offset += (arraysize - 1) * size;
+
+    --ctx->enc_count; /* Consume from buffer string */
+
+    /* Done checking, move to next field, pushing or popping struct stack if needed */
+    while (1) {
+      if (field == &ctx->root) {
+        ctx->head = NULL;
+        if (ctx->enc_count != 0) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return -1;
+        }
+        break; /* breaks both loops as ctx->enc_count == 0 */
+      }
+      ctx->head->field = ++field;
+      if (field->type == NULL) {
+        --ctx->head;
+        field = ctx->head->field;
+        continue;
+      } else if (field->type->typegroup == 'S') {
+        size_t parent_offset = ctx->head->parent_offset + field->offset;
+        if (field->type->fields->type == NULL) continue; /* empty struct */
+        field = field->type->fields;
+        ++ctx->head;
+        ctx->head->field = field;
+        ctx->head->parent_offset = parent_offset;
+        break;
+      } else {
+        break;
+      }
+    }
+  } while (ctx->enc_count);
+  ctx->enc_type = 0;
+  ctx->is_complex = 0;
+  return 0;
+}
+
+// Parse an array in the format string (e.g. (1,2,3))
+// Return 0 on success, -1 on error
+static int
+__pyx_buffmt_parse_array(__Pyx_BufFmt_Context* ctx, const char** tsp)
+{
+    const char *ts = *tsp;
+    int i = 0, number, ndim;
+
+    ++ts;
+    if (ctx->new_count != 1) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Cannot handle repeated arrays in format string");
+        return -1;
+    }
+
+    /* Process the previous element */
+    if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return -1;
+
+    // store ndim now, as field advanced by __Pyx_BufFmt_ProcessTypeChunk call
+    ndim = ctx->head->field->type->ndim;
+
+    /* Parse all numbers in the format string */
+    while (*ts && *ts != ')') {
+        // ignore space characters (not using isspace() due to C/C++ problem on MacOS-X)
+        switch (*ts) {
+            case ' ': case '\f': case '\r': case '\n': case '\t': case '\v':  continue;
+            default:  break;  /* not a 'break' in the loop */
+        }
+
+        number = __Pyx_BufFmt_ExpectNumber(&ts);
+        if (number == -1) return -1;
+
+        if (i < ndim && (size_t) number != ctx->head->field->type->arraysize[i]) {
+            PyErr_Format(PyExc_ValueError,
+                        "Expected a dimension of size %zu, got %d",
+                        ctx->head->field->type->arraysize[i], number);
+            return -1;
+        }
+
+        if (*ts != ',' && *ts != ')') {
+            PyErr_Format(PyExc_ValueError,
+                                "Expected a comma in format string, got '%c'", *ts);
+            return -1;
+        }
+
+        if (*ts == ',') ts++;
+        i++;
+    }
+
+    if (i != ndim) {
+        PyErr_Format(PyExc_ValueError, "Expected %d dimension(s), got %d",
+                            ctx->head->field->type->ndim, i);
+        return -1;
+    }
+
+    if (!*ts) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Unexpected end of format string, expected ')'");
+        return -1;
+    }
+
+    ctx->is_valid_array = 1;
+    ctx->new_count = 1;
+    *tsp = ++ts;
+    return 0;
+}
+
+static const char* __Pyx_BufFmt_CheckString(__Pyx_BufFmt_Context* ctx, const char* ts) {
+  int got_Z = 0;
+
+  while (1) {
+    /* puts(ts); */
+    switch(*ts) {
+      case 0:
+        if (ctx->enc_type != 0 && ctx->head == NULL) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return NULL;
+        }
+        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+        if (ctx->head != NULL) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return NULL;
+        }
+        return ts;
+      case ' ':
+      case '\r':
+      case '\n':
+        ++ts;
+        break;
+      case '<':
+        if (!__Pyx_Is_Little_Endian()) {
+          PyErr_SetString(PyExc_ValueError, "Little-endian buffer not supported on big-endian compiler");
+          return NULL;
+        }
+        ctx->new_packmode = '=';
+        ++ts;
+        break;
+      case '>':
+      case '!':
+        if (__Pyx_Is_Little_Endian()) {
+          PyErr_SetString(PyExc_ValueError, "Big-endian buffer not supported on little-endian compiler");
+          return NULL;
+        }
+        ctx->new_packmode = '=';
+        ++ts;
+        break;
+      case '=':
+      case '@':
+      case '^':
+        ctx->new_packmode = *ts++;
+        break;
+      case 'T': /* substruct */
+        {
+          const char* ts_after_sub;
+          size_t i, struct_count = ctx->new_count;
+          size_t struct_alignment = ctx->struct_alignment;
+          ctx->new_count = 1;
+          ++ts;
+          if (*ts != '{') {
+            PyErr_SetString(PyExc_ValueError, "Buffer acquisition: Expected '{' after 'T'");
+            return NULL;
+          }
+          if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+          ctx->enc_type = 0; /* Erase processed last struct element */
+          ctx->enc_count = 0;
+          ctx->struct_alignment = 0;
+          ++ts;
+          ts_after_sub = ts;
+          for (i = 0; i != struct_count; ++i) {
+            ts_after_sub = __Pyx_BufFmt_CheckString(ctx, ts);
+            if (!ts_after_sub) return NULL;
+          }
+          ts = ts_after_sub;
+          if (struct_alignment) ctx->struct_alignment = struct_alignment;
+        }
+        break;
+      case '}': /* end of substruct; either repeat or move on */
+        {
+          size_t alignment = ctx->struct_alignment;
+          ++ts;
+          if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+          ctx->enc_type = 0; /* Erase processed last struct element */
+          if (alignment && ctx->fmt_offset % alignment) {
+            /* Pad struct on size of the first member */
+            ctx->fmt_offset += alignment - (ctx->fmt_offset % alignment);
+          }
+        }
+        return ts;
+      case 'x':
+        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+        ctx->fmt_offset += ctx->new_count;
+        ctx->new_count = 1;
+        ctx->enc_count = 0;
+        ctx->enc_type = 0;
+        ctx->enc_packmode = ctx->new_packmode;
+        ++ts;
+        break;
+      case 'Z':
+        got_Z = 1;
+        ++ts;
+        if (*ts != 'f' && *ts != 'd' && *ts != 'g') {
+          __Pyx_BufFmt_RaiseUnexpectedChar('Z');
+          return NULL;
+        }
+        CYTHON_FALLTHROUGH;
+      case '?': case 'c': case 'b': case 'B': case 'h': case 'H': case 'i': case 'I':
+      case 'l': case 'L': case 'q': case 'Q':
+      case 'f': case 'd': case 'g':
+      case 'O': case 'p':
+        if ((ctx->enc_type == *ts) && (got_Z == ctx->is_complex) &&
+            (ctx->enc_packmode == ctx->new_packmode) && (!ctx->is_valid_array)) {
+          /* Continue pooling same type */
+          ctx->enc_count += ctx->new_count;
+          ctx->new_count = 1;
+          got_Z = 0;
+          ++ts;
+          break;
+        }
+        CYTHON_FALLTHROUGH;
+      case 's':
+        /* 's' or new type (cannot be added to current pool) */
+        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+        ctx->enc_count = ctx->new_count;
+        ctx->enc_packmode = ctx->new_packmode;
+        ctx->enc_type = *ts;
+        ctx->is_complex = got_Z;
+        ++ts;
+        ctx->new_count = 1;
+        got_Z = 0;
+        break;
+      case ':':
+        ++ts;
+        while(*ts != ':') ++ts;
+        ++ts;
+        break;
+      case '(':
+        if (__pyx_buffmt_parse_array(ctx, &ts) < 0) return NULL;
+        break;
+      default:
+        {
+          int number = __Pyx_BufFmt_ExpectNumber(&ts);
+          if (number == -1) return NULL;
+          ctx->new_count = (size_t)number;
+        }
+    }
+  }
+}
+
+/////////////// TypeInfoCompare.proto ///////////////
+static int __pyx_typeinfo_cmp(__Pyx_TypeInfo *a, __Pyx_TypeInfo *b);
+
+/////////////// TypeInfoCompare ///////////////
+//@requires: BufferFormatStructs
+
+// See if two dtypes are equal
+static int
+__pyx_typeinfo_cmp(__Pyx_TypeInfo *a, __Pyx_TypeInfo *b)
+{
+    int i;
+
+    if (!a || !b)
+        return 0;
+
+    if (a == b)
+        return 1;
+
+    if (a->size != b->size || a->typegroup != b->typegroup ||
+            a->is_unsigned != b->is_unsigned || a->ndim != b->ndim) {
+        if (a->typegroup == 'H' || b->typegroup == 'H') {
+            /* Special case for chars */
+            return a->size == b->size;
+        } else {
+            return 0;
+        }
+    }
+
+    if (a->ndim) {
+        /* Verify multidimensional C arrays */
+        for (i = 0; i < a->ndim; i++)
+            if (a->arraysize[i] != b->arraysize[i])
+                return 0;
+    }
+
+    if (a->typegroup == 'S') {
+        /* Check for packed struct */
+        if (a->flags != b->flags)
+            return 0;
+
+        /* compare all struct fields */
+        if (a->fields || b->fields) {
+            /* Check if both have fields */
+            if (!(a->fields && b->fields))
+                return 0;
+
+            /* compare */
+            for (i = 0; a->fields[i].type && b->fields[i].type; i++) {
+                __Pyx_StructField *field_a = a->fields + i;
+                __Pyx_StructField *field_b = b->fields + i;
+
+                if (field_a->offset != field_b->offset ||
+                    !__pyx_typeinfo_cmp(field_a->type, field_b->type))
+                    return 0;
+            }
+
+            /* If all fields are processed, we have a match */
+            return !a->fields[i].type && !b->fields[i].type;
+        }
+    }
+
+    return 1;
+}
+
+
+/////////////// TypeInfoToFormat.proto ///////////////
+struct __pyx_typeinfo_string {
+    char string[3];
+};
+static struct __pyx_typeinfo_string __Pyx_TypeInfoToFormat(__Pyx_TypeInfo *type);
+
+/////////////// TypeInfoToFormat ///////////////
+//@requires: BufferFormatStructs
+
+// See also MemoryView.pyx:BufferFormatFromTypeInfo
+
+static struct __pyx_typeinfo_string __Pyx_TypeInfoToFormat(__Pyx_TypeInfo *type) {
+    struct __pyx_typeinfo_string result = { {0} };
+    char *buf = (char *) result.string;
+    size_t size = type->size;
+
+    switch (type->typegroup) {
+        case 'H':
+            *buf = 'c';
+            break;
+        case 'I':
+        case 'U':
+            if (size == 1)
+                *buf = (type->is_unsigned) ? 'B' : 'b';
+            else if (size == 2)
+                *buf = (type->is_unsigned) ? 'H' : 'h';
+            else if (size == 4)
+                *buf = (type->is_unsigned) ? 'I' : 'i';
+            else if (size == 8)
+                *buf = (type->is_unsigned) ? 'Q' : 'q';
+            break;
+        case 'P':
+            *buf = 'P';
+            break;
+        case 'C':
+         {
+            __Pyx_TypeInfo complex_type = *type;
+            complex_type.typegroup = 'R';
+            complex_type.size /= 2;
+
+            *buf++ = 'Z';
+            *buf = __Pyx_TypeInfoToFormat(&complex_type).string[0];
+            break;
+         }
+        case 'R':
+            if (size == 4)
+                *buf = 'f';
+            else if (size == 8)
+                *buf = 'd';
+            else
+                *buf = 'g';
+            break;
+    }
+
+    return result;
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/Builtins.c b/contrib/tools/cython_py2/Cython/Utility/Builtins.c
new file mode 100644
index 00000000000..063d5e4bfd9
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Builtins.c
@@ -0,0 +1,609 @@
+/*
+ * Special implementations of built-in functions and methods.
+ *
+ * Optional optimisations for builtins are in Optimize.c.
+ *
+ * General object operations and protocols are in ObjectHandling.c.
+ */
+
+//////////////////// Globals.proto ////////////////////
+
+static PyObject* __Pyx_Globals(void); /*proto*/
+
+//////////////////// Globals ////////////////////
+//@substitute: naming
+//@requires: ObjectHandling.c::GetAttr
+
+// This is a stub implementation until we have something more complete.
+// Currently, we only handle the most common case of a read-only dict
+// of Python names.  Supporting cdef names in the module and write
+// access requires a rewrite as a dedicated class.
+
+static PyObject* __Pyx_Globals(void) {
+    return __Pyx_NewRef($moddict_cname);
+}
+
+//////////////////// PyExecGlobals.proto ////////////////////
+
+static PyObject* __Pyx_PyExecGlobals(PyObject*);
+
+//////////////////// PyExecGlobals ////////////////////
+//@substitute: naming
+//@requires: PyExec
+
+static PyObject* __Pyx_PyExecGlobals(PyObject* code) {
+    return __Pyx_PyExec2(code, $moddict_cname);
+}
+
+//////////////////// PyExec.proto ////////////////////
+
+static PyObject* __Pyx_PyExec3(PyObject*, PyObject*, PyObject*);
+static CYTHON_INLINE PyObject* __Pyx_PyExec2(PyObject*, PyObject*);
+
+//////////////////// PyExec ////////////////////
+//@substitute: naming
+
+static CYTHON_INLINE PyObject* __Pyx_PyExec2(PyObject* o, PyObject* globals) {
+    return __Pyx_PyExec3(o, globals, NULL);
+}
+
+static PyObject* __Pyx_PyExec3(PyObject* o, PyObject* globals, PyObject* locals) {
+    PyObject* result;
+    PyObject* s = 0;
+    char *code = 0;
+
+    if (!globals || globals == Py_None) {
+        globals = $moddict_cname;
+    } else if (unlikely(!PyDict_Check(globals))) {
+        __Pyx_TypeName globals_type_name =
+            __Pyx_PyType_GetName(Py_TYPE(globals));
+        PyErr_Format(PyExc_TypeError,
+                     "exec() arg 2 must be a dict, not " __Pyx_FMT_TYPENAME,
+                     globals_type_name);
+        __Pyx_DECREF_TypeName(globals_type_name);
+        goto bad;
+    }
+    if (!locals || locals == Py_None) {
+        locals = globals;
+    }
+
+    if (__Pyx_PyDict_GetItemStr(globals, PYIDENT("__builtins__")) == NULL) {
+        if (unlikely(PyDict_SetItem(globals, PYIDENT("__builtins__"), PyEval_GetBuiltins()) < 0))
+            goto bad;
+    }
+
+    if (PyCode_Check(o)) {
+        if (unlikely(__Pyx_PyCode_HasFreeVars((PyCodeObject *)o))) {
+            PyErr_SetString(PyExc_TypeError,
+                "code object passed to exec() may not contain free variables");
+            goto bad;
+        }
+        #if PY_VERSION_HEX < 0x030200B1 || (CYTHON_COMPILING_IN_PYPY && PYPY_VERSION_NUM < 0x07030400)
+        result = PyEval_EvalCode((PyCodeObject *)o, globals, locals);
+        #else
+        result = PyEval_EvalCode(o, globals, locals);
+        #endif
+    } else {
+        PyCompilerFlags cf;
+        cf.cf_flags = 0;
+#if PY_VERSION_HEX >= 0x030800A3
+        cf.cf_feature_version = PY_MINOR_VERSION;
+#endif
+        if (PyUnicode_Check(o)) {
+            cf.cf_flags = PyCF_SOURCE_IS_UTF8;
+            s = PyUnicode_AsUTF8String(o);
+            if (unlikely(!s)) goto bad;
+            o = s;
+        #if PY_MAJOR_VERSION >= 3
+        } else if (unlikely(!PyBytes_Check(o))) {
+        #else
+        } else if (unlikely(!PyString_Check(o))) {
+        #endif
+            __Pyx_TypeName o_type_name = __Pyx_PyType_GetName(Py_TYPE(o));
+            PyErr_Format(PyExc_TypeError,
+                "exec: arg 1 must be string, bytes or code object, got " __Pyx_FMT_TYPENAME,
+                o_type_name);
+            __Pyx_DECREF_TypeName(o_type_name);
+            goto bad;
+        }
+        #if PY_MAJOR_VERSION >= 3
+        code = PyBytes_AS_STRING(o);
+        #else
+        code = PyString_AS_STRING(o);
+        #endif
+        if (PyEval_MergeCompilerFlags(&cf)) {
+            result = PyRun_StringFlags(code, Py_file_input, globals, locals, &cf);
+        } else {
+            result = PyRun_String(code, Py_file_input, globals, locals);
+        }
+        Py_XDECREF(s);
+    }
+
+    return result;
+bad:
+    Py_XDECREF(s);
+    return 0;
+}
+
+//////////////////// GetAttr3.proto ////////////////////
+
+static CYTHON_INLINE PyObject *__Pyx_GetAttr3(PyObject *, PyObject *, PyObject *); /*proto*/
+
+//////////////////// GetAttr3 ////////////////////
+//@requires: ObjectHandling.c::PyObjectGetAttrStr
+//@requires: Exceptions.c::PyThreadStateGet
+//@requires: Exceptions.c::PyErrFetchRestore
+//@requires: Exceptions.c::PyErrExceptionMatches
+
+#if __PYX_LIMITED_VERSION_HEX < 0x030d00A1
+static PyObject *__Pyx_GetAttr3Default(PyObject *d) {
+    __Pyx_PyThreadState_declare
+    __Pyx_PyThreadState_assign
+    if (unlikely(!__Pyx_PyErr_ExceptionMatches(PyExc_AttributeError)))
+        return NULL;
+    __Pyx_PyErr_Clear();
+    Py_INCREF(d);
+    return d;
+}
+#endif
+
+static CYTHON_INLINE PyObject *__Pyx_GetAttr3(PyObject *o, PyObject *n, PyObject *d) {
+    PyObject *r;
+#if __PYX_LIMITED_VERSION_HEX >= 0x030d00A1
+    int res = PyObject_GetOptionalAttr(o, n, &r);
+    // On failure (res == -1), r is set to NULL.
+    return (res != 0) ? r : __Pyx_NewRef(d);
+#else
+  #if CYTHON_USE_TYPE_SLOTS
+    if (likely(PyString_Check(n))) {
+        r = __Pyx_PyObject_GetAttrStrNoError(o, n);
+        if (unlikely(!r) && likely(!PyErr_Occurred())) {
+            r = __Pyx_NewRef(d);
+        }
+        return r;
+    }
+  #endif
+    r = PyObject_GetAttr(o, n);
+    return (likely(r)) ? r : __Pyx_GetAttr3Default(d);
+#endif
+}
+
+//////////////////// HasAttr.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_HasAttr(PyObject *, PyObject *); /*proto*/
+
+//////////////////// HasAttr ////////////////////
+//@requires: ObjectHandling.c::GetAttr
+
+static CYTHON_INLINE int __Pyx_HasAttr(PyObject *o, PyObject *n) {
+    PyObject *r;
+    if (unlikely(!__Pyx_PyBaseString_Check(n))) {
+        PyErr_SetString(PyExc_TypeError,
+                        "hasattr(): attribute name must be string");
+        return -1;
+    }
+    r = __Pyx_GetAttr(o, n);
+    if (!r) {
+        PyErr_Clear();
+        return 0;
+    } else {
+        Py_DECREF(r);
+        return 1;
+    }
+}
+
+//////////////////// Intern.proto ////////////////////
+
+static PyObject* __Pyx_Intern(PyObject* s); /* proto */
+
+//////////////////// Intern ////////////////////
+//@requires: ObjectHandling.c::RaiseUnexpectedTypeError
+
+static PyObject* __Pyx_Intern(PyObject* s) {
+    if (unlikely(!PyString_CheckExact(s))) {
+        __Pyx_RaiseUnexpectedTypeError("str", s);
+        return NULL;
+    }
+    Py_INCREF(s);
+    #if PY_MAJOR_VERSION >= 3
+    PyUnicode_InternInPlace(&s);
+    #else
+    PyString_InternInPlace(&s);
+    #endif
+    return s;
+}
+
+//////////////////// abs_longlong.proto ////////////////////
+
+static CYTHON_INLINE PY_LONG_LONG __Pyx_abs_longlong(PY_LONG_LONG x) {
+#if defined (__cplusplus) && __cplusplus >= 201103L
+    return std::abs(x);
+#elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+    return llabs(x);
+#elif defined (_MSC_VER)
+    // abs() is defined for long, but 64-bits type on MSVC is long long.
+    // Use MS-specific _abs64() instead, which returns the original (negative) value for abs(-MAX-1)
+    return _abs64(x);
+#elif defined (__GNUC__)
+    // gcc or clang on 64 bit windows.
+    return __builtin_llabs(x);
+#else
+    if (sizeof(PY_LONG_LONG) <= sizeof(Py_ssize_t))
+        return __Pyx_sst_abs(x);
+    return (x<0) ? -x : x;
+#endif
+}
+
+
+//////////////////// py_abs.proto ////////////////////
+
+#if CYTHON_USE_PYLONG_INTERNALS
+static PyObject *__Pyx_PyLong_AbsNeg(PyObject *num);/*proto*/
+
+#define __Pyx_PyNumber_Absolute(x) \
+    ((likely(PyLong_CheckExact(x))) ? \
+         (likely(__Pyx_PyLong_IsNonNeg(x)) ? (Py_INCREF(x), (x)) : __Pyx_PyLong_AbsNeg(x)) : \
+         PyNumber_Absolute(x))
+
+#else
+#define __Pyx_PyNumber_Absolute(x)  PyNumber_Absolute(x)
+#endif
+
+//////////////////// py_abs ////////////////////
+
+#if CYTHON_USE_PYLONG_INTERNALS
+static PyObject *__Pyx_PyLong_AbsNeg(PyObject *n) {
+#if PY_VERSION_HEX >= 0x030C00A7
+    if (likely(__Pyx_PyLong_IsCompact(n))) {
+        return PyLong_FromSize_t(__Pyx_PyLong_CompactValueUnsigned(n));
+    }
+#else
+    if (likely(Py_SIZE(n) == -1)) {
+        // digits are unsigned
+        return PyLong_FromUnsignedLong(__Pyx_PyLong_Digits(n)[0]);
+    }
+#endif
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x030d0000
+    {
+        PyObject *copy = _PyLong_Copy((PyLongObject*)n);
+        if (likely(copy)) {
+            #if PY_VERSION_HEX >= 0x030C00A7
+            // clear the sign bits to set the sign from SIGN_NEGATIVE (2) to positive (0)
+            ((PyLongObject*)copy)->long_value.lv_tag = ((PyLongObject*)copy)->long_value.lv_tag & ~_PyLong_SIGN_MASK;
+            #else
+            // negate the size to swap the sign
+            __Pyx_SET_SIZE(copy, -Py_SIZE(copy));
+            #endif
+        }
+        return copy;
+    }
+#else
+    return PyNumber_Negative(n);
+#endif
+}
+#endif
+
+
+//////////////////// pow2.proto ////////////////////
+
+#define __Pyx_PyNumber_Power2(a, b) PyNumber_Power(a, b, Py_None)
+
+
+//////////////////// int_pyucs4.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_int_from_UCS4(Py_UCS4 uchar);
+
+//////////////////// int_pyucs4 ////////////////////
+
+static int __Pyx_int_from_UCS4(Py_UCS4 uchar) {
+    int digit = Py_UNICODE_TODIGIT(uchar);
+    if (unlikely(digit < 0)) {
+        PyErr_Format(PyExc_ValueError,
+            "invalid literal for int() with base 10: '%c'",
+            (int) uchar);
+        return -1;
+    }
+    return digit;
+}
+
+
+//////////////////// float_pyucs4.proto ////////////////////
+
+static CYTHON_INLINE double __Pyx_double_from_UCS4(Py_UCS4 uchar);
+
+//////////////////// float_pyucs4 ////////////////////
+
+static double __Pyx_double_from_UCS4(Py_UCS4 uchar) {
+    double digit = Py_UNICODE_TONUMERIC(uchar);
+    if (unlikely(digit < 0.0)) {
+        PyErr_Format(PyExc_ValueError,
+            "could not convert string to float: '%c'",
+            (int) uchar);
+        return -1.0;
+    }
+    return digit;
+}
+
+
+//////////////////// object_ord.proto ////////////////////
+//@requires: TypeConversion.c::UnicodeAsUCS4
+
+#if PY_MAJOR_VERSION >= 3
+#define __Pyx_PyObject_Ord(c) \
+    (likely(PyUnicode_Check(c)) ? (long)__Pyx_PyUnicode_AsPy_UCS4(c) : __Pyx__PyObject_Ord(c))
+#else
+#define __Pyx_PyObject_Ord(c) __Pyx__PyObject_Ord(c)
+#endif
+static long __Pyx__PyObject_Ord(PyObject* c); /*proto*/
+
+//////////////////// object_ord ////////////////////
+
+static long __Pyx__PyObject_Ord(PyObject* c) {
+    Py_ssize_t size;
+    if (PyBytes_Check(c)) {
+        size = PyBytes_GET_SIZE(c);
+        if (likely(size == 1)) {
+            return (unsigned char) PyBytes_AS_STRING(c)[0];
+        }
+#if PY_MAJOR_VERSION < 3
+    } else if (PyUnicode_Check(c)) {
+        return (long)__Pyx_PyUnicode_AsPy_UCS4(c);
+#endif
+#if (!CYTHON_COMPILING_IN_PYPY) || (defined(PyByteArray_AS_STRING) && defined(PyByteArray_GET_SIZE))
+    } else if (PyByteArray_Check(c)) {
+        size = PyByteArray_GET_SIZE(c);
+        if (likely(size == 1)) {
+            return (unsigned char) PyByteArray_AS_STRING(c)[0];
+        }
+#endif
+    } else {
+        // FIXME: support character buffers - but CPython doesn't support them either
+        __Pyx_TypeName c_type_name = __Pyx_PyType_GetName(Py_TYPE(c));
+        PyErr_Format(PyExc_TypeError,
+            "ord() expected string of length 1, but " __Pyx_FMT_TYPENAME " found",
+            c_type_name);
+        __Pyx_DECREF_TypeName(c_type_name);
+        return (long)(Py_UCS4)-1;
+    }
+    PyErr_Format(PyExc_TypeError,
+        "ord() expected a character, but string of length %zd found", size);
+    return (long)(Py_UCS4)-1;
+}
+
+
+//////////////////// py_dict_keys.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_Keys(PyObject* d); /*proto*/
+
+//////////////////// py_dict_keys ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_Keys(PyObject* d) {
+    if (PY_MAJOR_VERSION >= 3)
+        return CALL_UNBOUND_METHOD(PyDict_Type, "keys", d);
+    else
+        return PyDict_Keys(d);
+}
+
+//////////////////// py_dict_values.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_Values(PyObject* d); /*proto*/
+
+//////////////////// py_dict_values ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_Values(PyObject* d) {
+    if (PY_MAJOR_VERSION >= 3)
+        return CALL_UNBOUND_METHOD(PyDict_Type, "values", d);
+    else
+        return PyDict_Values(d);
+}
+
+//////////////////// py_dict_items.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_Items(PyObject* d); /*proto*/
+
+//////////////////// py_dict_items ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_Items(PyObject* d) {
+    if (PY_MAJOR_VERSION >= 3)
+        return CALL_UNBOUND_METHOD(PyDict_Type, "items", d);
+    else
+        return PyDict_Items(d);
+}
+
+//////////////////// py_dict_iterkeys.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_IterKeys(PyObject* d); /*proto*/
+
+//////////////////// py_dict_iterkeys ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_IterKeys(PyObject* d) {
+    if (PY_MAJOR_VERSION >= 3)
+        return CALL_UNBOUND_METHOD(PyDict_Type, "keys", d);
+    else
+        return CALL_UNBOUND_METHOD(PyDict_Type, "iterkeys", d);
+}
+
+//////////////////// py_dict_itervalues.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_IterValues(PyObject* d); /*proto*/
+
+//////////////////// py_dict_itervalues ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_IterValues(PyObject* d) {
+    if (PY_MAJOR_VERSION >= 3)
+        return CALL_UNBOUND_METHOD(PyDict_Type, "values", d);
+    else
+        return CALL_UNBOUND_METHOD(PyDict_Type, "itervalues", d);
+}
+
+//////////////////// py_dict_iteritems.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_IterItems(PyObject* d); /*proto*/
+
+//////////////////// py_dict_iteritems ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_IterItems(PyObject* d) {
+    if (PY_MAJOR_VERSION >= 3)
+        return CALL_UNBOUND_METHOD(PyDict_Type, "items", d);
+    else
+        return CALL_UNBOUND_METHOD(PyDict_Type, "iteritems", d);
+}
+
+//////////////////// py_dict_viewkeys.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_ViewKeys(PyObject* d); /*proto*/
+
+//////////////////// py_dict_viewkeys ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_ViewKeys(PyObject* d) {
+    if (PY_MAJOR_VERSION >= 3)
+        return CALL_UNBOUND_METHOD(PyDict_Type, "keys", d);
+    else
+        return CALL_UNBOUND_METHOD(PyDict_Type, "viewkeys", d);
+}
+
+//////////////////// py_dict_viewvalues.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_ViewValues(PyObject* d); /*proto*/
+
+//////////////////// py_dict_viewvalues ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_ViewValues(PyObject* d) {
+    if (PY_MAJOR_VERSION >= 3)
+        return CALL_UNBOUND_METHOD(PyDict_Type, "values", d);
+    else
+        return CALL_UNBOUND_METHOD(PyDict_Type, "viewvalues", d);
+}
+
+//////////////////// py_dict_viewitems.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_ViewItems(PyObject* d); /*proto*/
+
+//////////////////// py_dict_viewitems ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyDict_ViewItems(PyObject* d) {
+    if (PY_MAJOR_VERSION >= 3)
+        return CALL_UNBOUND_METHOD(PyDict_Type, "items", d);
+    else
+        return CALL_UNBOUND_METHOD(PyDict_Type, "viewitems", d);
+}
+
+
+//////////////////// pyfrozenset_new.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyFrozenSet_New(PyObject* it);
+
+//////////////////// pyfrozenset_new ////////////////////
+//@substitute: naming
+
+static CYTHON_INLINE PyObject* __Pyx_PyFrozenSet_New(PyObject* it) {
+    if (it) {
+        PyObject* result;
+#if CYTHON_COMPILING_IN_PYPY
+        // PyPy currently lacks PyFrozenSet_CheckExact() and PyFrozenSet_New()
+        PyObject* args;
+        args = PyTuple_Pack(1, it);
+        if (unlikely(!args))
+            return NULL;
+        result = PyObject_Call((PyObject*)&PyFrozenSet_Type, args, NULL);
+        Py_DECREF(args);
+        return result;
+#else
+        if (PyFrozenSet_CheckExact(it)) {
+            Py_INCREF(it);
+            return it;
+        }
+        result = PyFrozenSet_New(it);
+        if (unlikely(!result))
+            return NULL;
+        if ((PY_VERSION_HEX >= 0x031000A1) || likely(PySet_GET_SIZE(result)))
+            return result;
+        // empty frozenset is a singleton (on Python <3.10)
+        // seems wasteful, but CPython does the same
+        Py_DECREF(result);
+#endif
+    }
+#if CYTHON_USE_TYPE_SLOTS
+    return PyFrozenSet_Type.tp_new(&PyFrozenSet_Type, $empty_tuple, NULL);
+#else
+    return PyObject_Call((PyObject*)&PyFrozenSet_Type, $empty_tuple, NULL);
+#endif
+}
+
+
+//////////////////// PySet_Update.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_PySet_Update(PyObject* set, PyObject* it); /*proto*/
+
+//////////////////// PySet_Update ////////////////////
+
+static CYTHON_INLINE int __Pyx_PySet_Update(PyObject* set, PyObject* it) {
+    PyObject *retval;
+    #if CYTHON_USE_TYPE_SLOTS && !CYTHON_COMPILING_IN_PYPY
+    if (PyAnySet_Check(it)) {
+        if (PySet_GET_SIZE(it) == 0)
+            return 0;
+        // fast and safe case: CPython will update our result set and return it
+        retval = PySet_Type.tp_as_number->nb_inplace_or(set, it);
+        if (likely(retval == set)) {
+            Py_DECREF(retval);
+            return 0;
+        }
+        if (unlikely(!retval))
+            return -1;
+        // unusual result, fall through to set.update() call below
+        Py_DECREF(retval);
+    }
+    #endif
+    retval = CALL_UNBOUND_METHOD(PySet_Type, "update", set, it);
+    if (unlikely(!retval)) return -1;
+    Py_DECREF(retval);
+    return 0;
+}
+
+///////////////// memoryview_get_from_buffer.proto ////////////////////
+
+// buffer is in limited api from Py3.11
+#if !CYTHON_COMPILING_IN_LIMITED_API || CYTHON_LIMITED_API >= 0x030b0000
+#define __Pyx_PyMemoryView_Get_{{name}}(o) PyMemoryView_GET_BUFFER(o)->{{name}}
+#else
+{{py:
+out_types = dict(
+    ndim='int', readonly='int',
+    len='Py_ssize_t', itemsize='Py_ssize_t')
+}} // can't get format like this unfortunately. It's unicode via getattr
+{{py: out_type = out_types[name]}}
+static {{out_type}} __Pyx_PyMemoryView_Get_{{name}}(PyObject *obj); /* proto */
+#endif
+
+////////////// memoryview_get_from_buffer /////////////////////////
+
+#if !CYTHON_COMPILING_IN_LIMITED_API || CYTHON_LIMITED_API >= 0x030b0000
+#else
+{{py:
+out_types = dict(
+    ndim='int', readonly='int',
+    len='Py_ssize_t', itemsize='Py_ssize_t')
+}}
+{{py: out_type = out_types[name]}}
+static {{out_type}} __Pyx_PyMemoryView_Get_{{name}}(PyObject *obj) {
+    {{out_type}} result;
+    PyObject *attr = PyObject_GetAttr(obj, PYIDENT("{{name}}"));
+    if (!attr) {
+        goto bad;
+    }
+{{if out_type == 'int'}}
+    // I'm not worrying about overflow here because
+    // ultimately it comes from a C struct that's an int
+    result = PyLong_AsLong(attr);
+{{elif out_type == 'Py_ssize_t'}}
+    result = PyLong_AsSsize_t(attr);
+{{endif}}
+    Py_DECREF(attr);
+    return result;
+
+    bad:
+    Py_XDECREF(attr);
+    return -1;
+}
+#endif
diff --git a/contrib/tools/cython_py2/Cython/Utility/CConvert.pyx b/contrib/tools/cython_py2/Cython/Utility/CConvert.pyx
new file mode 100644
index 00000000000..4ae66162ee5
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/CConvert.pyx
@@ -0,0 +1,134 @@
+#################### FromPyStructUtility ####################
+
+cdef extern from *:
+    ctypedef struct PyTypeObject:
+        char* tp_name
+    PyTypeObject *Py_TYPE(obj)
+    bint PyMapping_Check(obj)
+    object PyErr_Format(exc, const char *format, ...)
+    int __Pyx_RaiseUnexpectedTypeError(const char *expected, object obj) except 0
+
+@cname("{{funcname}}")
+cdef {{struct_type}} {{funcname}}(obj) except *:
+    cdef {{struct_type}} result
+    if not PyMapping_Check(obj):
+        __Pyx_RaiseUnexpectedTypeError(b"a mapping", obj)
+
+    {{for member in var_entries:}}
+    try:
+        value = obj['{{member.name}}']
+    except KeyError:
+        raise ValueError("No value specified for struct attribute '{{member.name}}'")
+    result.{{member.name}} = value
+    {{endfor}}
+    return result
+
+
+#################### FromPyUnionUtility ####################
+
+cdef extern from *:
+    ctypedef struct PyTypeObject:
+        char* tp_name
+    PyTypeObject *Py_TYPE(obj)
+    bint PyMapping_Check(obj)
+    object PyErr_Format(exc, const char *format, ...)
+    int __Pyx_RaiseUnexpectedTypeError(const char *expected, object obj) except 0
+
+@cname("{{funcname}}")
+cdef {{struct_type}} {{funcname}}(obj) except *:
+    cdef {{struct_type}} result
+    cdef Py_ssize_t length
+    if not PyMapping_Check(obj):
+        __Pyx_RaiseUnexpectedTypeError(b"a mapping", obj)
+
+    last_found = None
+    length = len(obj)
+    if length:
+        {{for member in var_entries:}}
+        if '{{member.name}}' in obj:
+            if last_found is not None:
+                raise ValueError("More than one union attribute passed: '%s' and '%s'" % (last_found, '{{member.name}}'))
+            last_found = '{{member.name}}'
+            result.{{member.cname}} = obj['{{member.name}}']
+            length -= 1
+            if not length:
+                return result
+        {{endfor}}
+    if last_found is None:
+        raise ValueError("No value specified for any of the union attributes (%s)" %
+                         '{{", ".join(member.name for member in var_entries)}}')
+    return result
+
+
+#################### cfunc.to_py ####################
+
+@cname("{{cname}}")
+cdef object {{cname}}({{return_type.ctype}} (*f)({{ ', '.join(arg.type_cname for arg in args) }}) {{except_clause}}):
+    def wrap({{ ', '.join('{arg.ctype} {arg.name}'.format(arg=arg) for arg in args) }}):
+        """wrap({{', '.join(('{arg.name}: {arg.type_displayname}'.format(arg=arg) if arg.type_displayname else arg.name) for arg in args)}}){{if return_type.type_displayname}} -> {{return_type.type_displayname}}{{endif}}"""
+        {{'' if return_type.type.is_void else 'return '}}f({{ ', '.join(arg.name for arg in args) }})
+    return wrap
+
+
+#################### carray.from_py ####################
+
+cdef extern from *:
+    object PyErr_Format(exc, const char *format, ...)
+
+@cname("{{cname}}")
+cdef int {{cname}}(object o, {{base_type}} *v, Py_ssize_t length) except -1:
+    cdef Py_ssize_t i = length
+    try:
+        i = len(o)
+    except (TypeError, OverflowError):
+        pass
+    if i == length:
+        for i, item in enumerate(o):
+            if i >= length:
+                break
+            v[i] = item
+        else:
+            i += 1  # convert index to length
+            if i == length:
+                return 0
+
+    PyErr_Format(
+        IndexError,
+        ("too many values found during array assignment, expected %zd"
+         if i >= length else
+         "not enough values found during array assignment, expected %zd, got %zd"),
+        length, i)
+
+
+#################### carray.to_py ####################
+
+cdef extern from *:
+    void Py_INCREF(object o)
+    tuple PyTuple_New(Py_ssize_t size)
+    list PyList_New(Py_ssize_t size)
+    void PyTuple_SET_ITEM(object  p, Py_ssize_t pos, object o)
+    void PyList_SET_ITEM(object  p, Py_ssize_t pos, object o)
+
+
+@cname("{{cname}}")
+cdef inline list {{cname}}({{base_type}} *v, Py_ssize_t length):
+    cdef size_t i
+    cdef object value
+    l = PyList_New(length)
+    for i in range(<size_t>length):
+        value = v[i]
+        Py_INCREF(value)
+        PyList_SET_ITEM(l, i, value)
+    return l
+
+
+@cname("{{to_tuple_cname}}")
+cdef inline tuple {{to_tuple_cname}}({{base_type}} *v, Py_ssize_t length):
+    cdef size_t i
+    cdef object value
+    t = PyTuple_New(length)
+    for i in range(<size_t>length):
+        value = v[i]
+        Py_INCREF(value)
+        PyTuple_SET_ITEM(t, i, value)
+    return t
diff --git a/contrib/tools/cython_py2/Cython/Utility/CMath.c b/contrib/tools/cython_py2/Cython/Utility/CMath.c
new file mode 100644
index 00000000000..2cd22231384
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/CMath.c
@@ -0,0 +1,95 @@
+
+/////////////// CDivisionWarning.proto ///////////////
+
+static int __Pyx_cdivision_warning(const char *, int); /* proto */
+
+/////////////// CDivisionWarning ///////////////
+
+static int __Pyx_cdivision_warning(const char *filename, int lineno) {
+#if CYTHON_COMPILING_IN_PYPY
+    // avoid compiler warnings
+    filename++; lineno++;
+    return PyErr_Warn(PyExc_RuntimeWarning,
+                     "division with oppositely signed operands, C and Python semantics differ");
+#else
+    return PyErr_WarnExplicit(PyExc_RuntimeWarning,
+                              "division with oppositely signed operands, C and Python semantics differ",
+                              filename,
+                              lineno,
+                              __Pyx_MODULE_NAME,
+                              NULL);
+#endif
+}
+
+
+/////////////// DivInt.proto ///////////////
+
+static CYTHON_INLINE %(type)s __Pyx_div_%(type_name)s(%(type)s, %(type)s); /* proto */
+
+/////////////// DivInt ///////////////
+
+static CYTHON_INLINE %(type)s __Pyx_div_%(type_name)s(%(type)s a, %(type)s b) {
+    %(type)s q = a / b;
+    %(type)s r = a - q*b;
+    q -= ((r != 0) & ((r ^ b) < 0));
+    return q;
+}
+
+
+/////////////// ModInt.proto ///////////////
+
+static CYTHON_INLINE %(type)s __Pyx_mod_%(type_name)s(%(type)s, %(type)s); /* proto */
+
+/////////////// ModInt ///////////////
+
+static CYTHON_INLINE %(type)s __Pyx_mod_%(type_name)s(%(type)s a, %(type)s b) {
+    %(type)s r = a %% b;
+    r += ((r != 0) & ((r ^ b) < 0)) * b;
+    return r;
+}
+
+
+/////////////// ModFloat.proto ///////////////
+
+static CYTHON_INLINE %(type)s __Pyx_mod_%(type_name)s(%(type)s, %(type)s); /* proto */
+
+/////////////// ModFloat ///////////////
+
+static CYTHON_INLINE %(type)s __Pyx_mod_%(type_name)s(%(type)s a, %(type)s b) {
+    %(type)s r = fmod%(math_h_modifier)s(a, b);
+    r += ((r != 0) & ((r < 0) ^ (b < 0))) * b;
+    return r;
+}
+
+
+/////////////// IntPow.proto ///////////////
+
+static CYTHON_INLINE %(type)s %(func_name)s(%(type)s, %(type)s); /* proto */
+
+/////////////// IntPow ///////////////
+
+static CYTHON_INLINE %(type)s %(func_name)s(%(type)s b, %(type)s e) {
+    %(type)s t = b;
+    switch (e) {
+        case 3:
+            t *= b;
+        CYTHON_FALLTHROUGH;
+        case 2:
+            t *= b;
+        CYTHON_FALLTHROUGH;
+        case 1:
+            return t;
+        case 0:
+            return 1;
+    }
+    #if %(signed)s
+    if (unlikely(e<0)) return 0;
+    #endif
+    t = 1;
+    while (likely(e)) {
+        t *= (b * (e&1)) | ((~e)&1);    /* 1 or b */
+        b *= b;
+        e >>= 1;
+    }
+    return t;
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/CommonStructures.c b/contrib/tools/cython_py2/Cython/Utility/CommonStructures.c
new file mode 100644
index 00000000000..35875d0ec24
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/CommonStructures.c
@@ -0,0 +1,139 @@
+/////////////// FetchSharedCythonModule.proto ///////
+
+static PyObject *__Pyx_FetchSharedCythonABIModule(void);
+
+/////////////// FetchSharedCythonModule ////////////
+
+static PyObject *__Pyx_FetchSharedCythonABIModule(void) {
+    return __Pyx_PyImport_AddModuleRef((char*) __PYX_ABI_MODULE_NAME);
+}
+
+/////////////// FetchCommonType.proto ///////////////
+
+#if !CYTHON_USE_TYPE_SPECS
+static PyTypeObject* __Pyx_FetchCommonType(PyTypeObject* type);
+#else
+static PyTypeObject* __Pyx_FetchCommonTypeFromSpec(PyObject *module, PyType_Spec *spec, PyObject *bases);
+#endif
+
+/////////////// FetchCommonType ///////////////
+//@requires:ExtensionTypes.c::FixUpExtensionType
+//@requires: FetchSharedCythonModule
+//@requires:StringTools.c::IncludeStringH
+
+static int __Pyx_VerifyCachedType(PyObject *cached_type,
+                               const char *name,
+                               Py_ssize_t basicsize,
+                               Py_ssize_t expected_basicsize) {
+    if (!PyType_Check(cached_type)) {
+        PyErr_Format(PyExc_TypeError,
+            "Shared Cython type %.200s is not a type object", name);
+        return -1;
+    }
+    if (basicsize != expected_basicsize) {
+        PyErr_Format(PyExc_TypeError,
+            "Shared Cython type %.200s has the wrong size, try recompiling",
+            name);
+        return -1;
+    }
+    return 0;
+}
+
+#if !CYTHON_USE_TYPE_SPECS
+static PyTypeObject* __Pyx_FetchCommonType(PyTypeObject* type) {
+    PyObject* abi_module;
+    const char* object_name;
+    PyTypeObject *cached_type = NULL;
+
+    abi_module = __Pyx_FetchSharedCythonABIModule();
+    if (!abi_module) return NULL;
+    // get the final part of the object name (after the last dot)
+    object_name = strrchr(type->tp_name, '.');
+    object_name = object_name ? object_name+1 : type->tp_name;
+    cached_type = (PyTypeObject*) PyObject_GetAttrString(abi_module, object_name);
+    if (cached_type) {
+        if (__Pyx_VerifyCachedType(
+              (PyObject *)cached_type,
+              object_name,
+              cached_type->tp_basicsize,
+              type->tp_basicsize) < 0) {
+            goto bad;
+        }
+        goto done;
+    }
+
+    if (!PyErr_ExceptionMatches(PyExc_AttributeError)) goto bad;
+    PyErr_Clear();
+    if (PyType_Ready(type) < 0) goto bad;
+    if (PyObject_SetAttrString(abi_module, object_name, (PyObject *)type) < 0)
+        goto bad;
+    Py_INCREF(type);
+    cached_type = type;
+
+done:
+    Py_DECREF(abi_module);
+    // NOTE: always returns owned reference, or NULL on error
+    return cached_type;
+
+bad:
+    Py_XDECREF(cached_type);
+    cached_type = NULL;
+    goto done;
+}
+#else
+
+static PyTypeObject *__Pyx_FetchCommonTypeFromSpec(PyObject *module, PyType_Spec *spec, PyObject *bases) {
+    PyObject *abi_module, *cached_type = NULL;
+    // get the final part of the object name (after the last dot)
+    const char* object_name = strrchr(spec->name, '.');
+    object_name = object_name ? object_name+1 : spec->name;
+
+    abi_module = __Pyx_FetchSharedCythonABIModule();
+    if (!abi_module) return NULL;
+
+    cached_type = PyObject_GetAttrString(abi_module, object_name);
+    if (cached_type) {
+        Py_ssize_t basicsize;
+#if CYTHON_COMPILING_IN_LIMITED_API
+        PyObject *py_basicsize;
+        py_basicsize = PyObject_GetAttrString(cached_type, "__basicsize__");
+        if (unlikely(!py_basicsize)) goto bad;
+        basicsize = PyLong_AsSsize_t(py_basicsize);
+        Py_DECREF(py_basicsize);
+        py_basicsize = 0;
+        if (unlikely(basicsize == (Py_ssize_t)-1) && PyErr_Occurred()) goto bad;
+#else
+        basicsize = likely(PyType_Check(cached_type)) ? ((PyTypeObject*) cached_type)->tp_basicsize : -1;
+#endif
+        if (__Pyx_VerifyCachedType(
+              cached_type,
+              object_name,
+              basicsize,
+              spec->basicsize) < 0) {
+            goto bad;
+        }
+        goto done;
+    }
+
+    if (!PyErr_ExceptionMatches(PyExc_AttributeError)) goto bad;
+    PyErr_Clear();
+    // We pass the ABI module reference to avoid keeping the user module alive by foreign type usages.
+    CYTHON_UNUSED_VAR(module);
+    cached_type = __Pyx_PyType_FromModuleAndSpec(abi_module, spec, bases);
+    if (unlikely(!cached_type)) goto bad;
+    if (unlikely(__Pyx_fix_up_extension_type_from_spec(spec, (PyTypeObject *) cached_type) < 0)) goto bad;
+    if (PyObject_SetAttrString(abi_module, object_name, cached_type) < 0) goto bad;
+
+done:
+    Py_DECREF(abi_module);
+    // NOTE: always returns owned reference, or NULL on error
+    assert(cached_type == NULL || PyType_Check(cached_type));
+    return (PyTypeObject *) cached_type;
+
+bad:
+    Py_XDECREF(cached_type);
+    cached_type = NULL;
+    goto done;
+}
+#endif
+
diff --git a/contrib/tools/cython_py2/Cython/Utility/CommonTypes.c b/contrib/tools/cython_py2/Cython/Utility/CommonTypes.c
new file mode 100644
index 00000000000..c2403cbf98a
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/CommonTypes.c
@@ -0,0 +1,48 @@
+/////////////// FetchCommonType.proto ///////////////
+
+static PyTypeObject* __Pyx_FetchCommonType(PyTypeObject* type);
+
+/////////////// FetchCommonType ///////////////
+
+static PyTypeObject* __Pyx_FetchCommonType(PyTypeObject* type) {
+    PyObject* fake_module;
+    PyTypeObject* cached_type = NULL;
+
+    fake_module = PyImport_AddModule((char*) "_cython_" CYTHON_ABI);
+    if (!fake_module) return NULL;
+    Py_INCREF(fake_module);
+
+    cached_type = (PyTypeObject*) PyObject_GetAttrString(fake_module, type->tp_name);
+    if (cached_type) {
+        if (!PyType_Check((PyObject*)cached_type)) {
+            PyErr_Format(PyExc_TypeError,
+                "Shared Cython type %.200s is not a type object",
+                type->tp_name);
+            goto bad;
+        }
+        if (cached_type->tp_basicsize != type->tp_basicsize) {
+            PyErr_Format(PyExc_TypeError,
+                "Shared Cython type %.200s has the wrong size, try recompiling",
+                type->tp_name);
+            goto bad;
+        }
+    } else {
+        if (!PyErr_ExceptionMatches(PyExc_AttributeError)) goto bad;
+        PyErr_Clear();
+        if (PyType_Ready(type) < 0) goto bad;
+        if (PyObject_SetAttrString(fake_module, type->tp_name, (PyObject*) type) < 0)
+            goto bad;
+        Py_INCREF(type);
+        cached_type = type;
+    }
+
+done:
+    Py_DECREF(fake_module);
+    // NOTE: always returns owned reference, or NULL on error
+    return cached_type;
+
+bad:
+    Py_XDECREF(cached_type);
+    cached_type = NULL;
+    goto done;
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/Complex.c b/contrib/tools/cython_py2/Cython/Utility/Complex.c
new file mode 100644
index 00000000000..c95511dcf3c
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Complex.c
@@ -0,0 +1,366 @@
+/////////////// Header.proto ///////////////
+//@proto_block: h_code
+
+#if !defined(CYTHON_CCOMPLEX)
+  #if defined(__cplusplus)
+    #define CYTHON_CCOMPLEX 1
+  #elif (defined(_Complex_I) && !defined(_MSC_VER)) || ((defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) && !defined(__STDC_NO_COMPLEX__) && !defined(_MSC_VER))
+    // <complex.h> should exist since C99, but only C11 defines a test to detect it.
+    // MSVC defines "_Complex_I" but not "_Complex". See https://github.com/cython/cython/issues/5512
+    #define CYTHON_CCOMPLEX 1
+  #else
+    #define CYTHON_CCOMPLEX 0
+  #endif
+#endif
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    #include <complex>
+  #else
+    #include <complex.h>
+  #endif
+#endif
+
+#if CYTHON_CCOMPLEX && !defined(__cplusplus) && defined(__sun__) && defined(__GNUC__)
+  #undef _Complex_I
+  #define _Complex_I 1.0fj
+#endif
+
+/////////////// RealImag.proto ///////////////
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    #define __Pyx_CREAL(z) ((z).real())
+    #define __Pyx_CIMAG(z) ((z).imag())
+  #else
+    #define __Pyx_CREAL(z) (__real__(z))
+    #define __Pyx_CIMAG(z) (__imag__(z))
+  #endif
+#else
+    #define __Pyx_CREAL(z) ((z).real)
+    #define __Pyx_CIMAG(z) ((z).imag)
+#endif
+
+#if defined(__cplusplus) && CYTHON_CCOMPLEX \
+        && (defined(_WIN32) || defined(__clang__) || (defined(__GNUC__) && (__GNUC__ >= 5 || __GNUC__ == 4 && __GNUC_MINOR__ >= 4 )) || __cplusplus >= 201103)
+    #define __Pyx_SET_CREAL(z,x) ((z).real(x))
+    #define __Pyx_SET_CIMAG(z,y) ((z).imag(y))
+#else
+    #define __Pyx_SET_CREAL(z,x) __Pyx_CREAL(z) = (x)
+    #define __Pyx_SET_CIMAG(z,y) __Pyx_CIMAG(z) = (y)
+#endif
+
+/////////////// RealImag_Cy.proto ///////////////
+
+// alternative version of RealImag.proto for the case where
+// we definitely want to force it to use the Cython utility
+// code version of complex.
+// Because integer complex types simply aren't covered by
+// the C or C++ standards
+// (although practically will probably work in C++).
+
+#define __Pyx_CREAL_Cy(z) ((z).real)
+#define __Pyx_CIMAG_Cy(z) ((z).imag)
+#define __Pyx_SET_CREAL_Cy(z,x) __Pyx_CREAL_Cy(z) = (x)
+#define __Pyx_SET_CIMAG_Cy(z,y) __Pyx_CIMAG_cy(z) = (y)
+
+/////////////// RealImag_CyTypedef.proto //////////
+//@requires: RealImag
+//@requires: RealImag_Cy
+
+#if __cplusplus
+// C++ is fine with complexes based on typedefs because the template sees through them
+#define __Pyx_CREAL_CyTypedef(z) __Pyx_CREAL(z)
+#define __Pyx_CIMAG_CyTypedef(z) __Pyx_CIMAG(z)
+#define __Pyx_SET_CREAL_CyTypedef(z,x) __Pyx_SET_CREAL(z)
+#define __Pyx_SET_CIMAG_CyTypedef(z,x) __Pyx_SET_CIMAG(z)
+#else
+// C isn't
+#define __Pyx_CREAL_CyTypedef(z) __Pyx_CREAL_Cy(z)
+#define __Pyx_CIMAG_CyTypedef(z) __Pyx_CIMAG_Cy(z)
+#define __Pyx_SET_CREAL_CyTypedef(z,x) __Pyx_SET_CREAL_Cy(z)
+#define __Pyx_SET_CIMAG_CyTypedef(z,x) __Pyx_SET_CIMAG_Cy(z)
+#endif
+
+/////////////// Declarations.proto ///////////////
+//@proto_block: complex_type_declarations
+
+#if CYTHON_CCOMPLEX && ({{is_float}}) && (!{{is_extern_float_typedef}} || __cplusplus)
+  #ifdef __cplusplus
+    typedef ::std::complex< {{real_type}} > {{type_name}};
+  #else
+    typedef {{real_type}} _Complex {{type_name}};
+  #endif
+#else
+    typedef struct { {{real_type}} real, imag; } {{type_name}};
+#endif
+
+static CYTHON_INLINE {{type}} {{type_name}}_from_parts({{real_type}}, {{real_type}});
+
+/////////////// Declarations ///////////////
+
+#if CYTHON_CCOMPLEX && ({{is_float}}) && (!{{is_extern_float_typedef}} || __cplusplus)
+  #ifdef __cplusplus
+    static CYTHON_INLINE {{type}} {{type_name}}_from_parts({{real_type}} x, {{real_type}} y) {
+      return ::std::complex< {{real_type}} >(x, y);
+    }
+  #else
+    static CYTHON_INLINE {{type}} {{type_name}}_from_parts({{real_type}} x, {{real_type}} y) {
+      return x + y*({{type}})_Complex_I;
+    }
+  #endif
+#else
+    static CYTHON_INLINE {{type}} {{type_name}}_from_parts({{real_type}} x, {{real_type}} y) {
+      {{type}} z;
+      z.real = x;
+      z.imag = y;
+      return z;
+    }
+#endif
+
+
+/////////////// ToPy.proto ///////////////
+
+{{py: func_suffix = "_CyTypedef" if is_extern_float_typedef else ("" if is_float else "_Cy")}}
+#define __pyx_PyComplex_FromComplex{{func_suffix}}(z) \
+        PyComplex_FromDoubles((double)__Pyx_CREAL{{func_suffix}}(z), \
+                              (double)__Pyx_CIMAG{{func_suffix}}(z))
+
+/////////////// FromPy.proto ///////////////
+
+static {{type}} __Pyx_PyComplex_As_{{type_name}}(PyObject*);
+
+/////////////// FromPy ///////////////
+
+static {{type}} __Pyx_PyComplex_As_{{type_name}}(PyObject* o) {
+    Py_complex cval;
+#if !CYTHON_COMPILING_IN_PYPY
+    if (PyComplex_CheckExact(o))
+        cval = ((PyComplexObject *)o)->cval;
+    else
+#endif
+        cval = PyComplex_AsCComplex(o);
+    return {{type_name}}_from_parts(
+               ({{real_type}})cval.real,
+               ({{real_type}})cval.imag);
+}
+
+
+/////////////// Arithmetic.proto ///////////////
+
+#if CYTHON_CCOMPLEX && ({{is_float}}) && (!{{is_extern_float_typedef}} || __cplusplus)
+    #define __Pyx_c_eq{{func_suffix}}(a, b)   ((a)==(b))
+    #define __Pyx_c_sum{{func_suffix}}(a, b)  ((a)+(b))
+    #define __Pyx_c_diff{{func_suffix}}(a, b) ((a)-(b))
+    #define __Pyx_c_prod{{func_suffix}}(a, b) ((a)*(b))
+    #define __Pyx_c_quot{{func_suffix}}(a, b) ((a)/(b))
+    #define __Pyx_c_neg{{func_suffix}}(a)     (-(a))
+  #ifdef __cplusplus
+    #define __Pyx_c_is_zero{{func_suffix}}(z) ((z)==({{real_type}})0)
+    #define __Pyx_c_conj{{func_suffix}}(z)    (::std::conj(z))
+    #if {{is_float}}
+        #define __Pyx_c_abs{{func_suffix}}(z)     (::std::abs(z))
+        #define __Pyx_c_pow{{func_suffix}}(a, b)  (::std::pow(a, b))
+    #endif
+  #else
+    #define __Pyx_c_is_zero{{func_suffix}}(z) ((z)==0)
+    #define __Pyx_c_conj{{func_suffix}}(z)    (conj{{m}}(z))
+    #if {{is_float}}
+        #define __Pyx_c_abs{{func_suffix}}(z)     (cabs{{m}}(z))
+        #define __Pyx_c_pow{{func_suffix}}(a, b)  (cpow{{m}}(a, b))
+    #endif
+ #endif
+#else
+    static CYTHON_INLINE int __Pyx_c_eq{{func_suffix}}({{type}}, {{type}});
+    static CYTHON_INLINE {{type}} __Pyx_c_sum{{func_suffix}}({{type}}, {{type}});
+    static CYTHON_INLINE {{type}} __Pyx_c_diff{{func_suffix}}({{type}}, {{type}});
+    static CYTHON_INLINE {{type}} __Pyx_c_prod{{func_suffix}}({{type}}, {{type}});
+    static CYTHON_INLINE {{type}} __Pyx_c_quot{{func_suffix}}({{type}}, {{type}});
+    static CYTHON_INLINE {{type}} __Pyx_c_neg{{func_suffix}}({{type}});
+    static CYTHON_INLINE int __Pyx_c_is_zero{{func_suffix}}({{type}});
+    static CYTHON_INLINE {{type}} __Pyx_c_conj{{func_suffix}}({{type}});
+    #if {{is_float}}
+        static CYTHON_INLINE {{real_type}} __Pyx_c_abs{{func_suffix}}({{type}});
+        static CYTHON_INLINE {{type}} __Pyx_c_pow{{func_suffix}}({{type}}, {{type}});
+    #endif
+#endif
+
+/////////////// Arithmetic ///////////////
+
+#if CYTHON_CCOMPLEX && ({{is_float}}) && (!{{is_extern_float_typedef}} || __cplusplus)
+#else
+    static CYTHON_INLINE int __Pyx_c_eq{{func_suffix}}({{type}} a, {{type}} b) {
+       return (a.real == b.real) && (a.imag == b.imag);
+    }
+    static CYTHON_INLINE {{type}} __Pyx_c_sum{{func_suffix}}({{type}} a, {{type}} b) {
+        {{type}} z;
+        z.real = a.real + b.real;
+        z.imag = a.imag + b.imag;
+        return z;
+    }
+    static CYTHON_INLINE {{type}} __Pyx_c_diff{{func_suffix}}({{type}} a, {{type}} b) {
+        {{type}} z;
+        z.real = a.real - b.real;
+        z.imag = a.imag - b.imag;
+        return z;
+    }
+    static CYTHON_INLINE {{type}} __Pyx_c_prod{{func_suffix}}({{type}} a, {{type}} b) {
+        {{type}} z;
+        z.real = a.real * b.real - a.imag * b.imag;
+        z.imag = a.real * b.imag + a.imag * b.real;
+        return z;
+    }
+
+    #if {{is_float}}
+    static CYTHON_INLINE {{type}} __Pyx_c_quot{{func_suffix}}({{type}} a, {{type}} b) {
+        if (b.imag == 0) {
+            return {{type_name}}_from_parts(a.real / b.real, a.imag / b.real);
+        } else if (fabs{{m}}(b.real) >= fabs{{m}}(b.imag)) {
+            if (b.real == 0 && b.imag == 0) {
+                return {{type_name}}_from_parts(a.real / b.real, a.imag / b.imag);
+            } else {
+                {{real_type}} r = b.imag / b.real;
+                {{real_type}} s = ({{real_type}})(1.0) / (b.real + b.imag * r);
+                return {{type_name}}_from_parts(
+                    (a.real + a.imag * r) * s, (a.imag - a.real * r) * s);
+            }
+        } else {
+            {{real_type}} r = b.real / b.imag;
+            {{real_type}} s = ({{real_type}})(1.0) / (b.imag + b.real * r);
+            return {{type_name}}_from_parts(
+                (a.real * r + a.imag) * s, (a.imag * r - a.real) * s);
+        }
+    }
+    #else
+    static CYTHON_INLINE {{type}} __Pyx_c_quot{{func_suffix}}({{type}} a, {{type}} b) {
+        if (b.imag == 0) {
+            return {{type_name}}_from_parts(a.real / b.real, a.imag / b.real);
+        } else {
+            {{real_type}} denom = b.real * b.real + b.imag * b.imag;
+            return {{type_name}}_from_parts(
+                (a.real * b.real + a.imag * b.imag) / denom,
+                (a.imag * b.real - a.real * b.imag) / denom);
+        }
+    }
+    #endif
+
+    static CYTHON_INLINE {{type}} __Pyx_c_neg{{func_suffix}}({{type}} a) {
+        {{type}} z;
+        z.real = -a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    static CYTHON_INLINE int __Pyx_c_is_zero{{func_suffix}}({{type}} a) {
+       return (a.real == 0) && (a.imag == 0);
+    }
+    static CYTHON_INLINE {{type}} __Pyx_c_conj{{func_suffix}}({{type}} a) {
+        {{type}} z;
+        z.real =  a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    #if {{is_float}}
+        static CYTHON_INLINE {{real_type}} __Pyx_c_abs{{func_suffix}}({{type}} z) {
+          #if !defined(HAVE_HYPOT) || defined(_MSC_VER)
+            return sqrt{{m}}(z.real*z.real + z.imag*z.imag);
+          #else
+            return hypot{{m}}(z.real, z.imag);
+          #endif
+        }
+        static CYTHON_INLINE {{type}} __Pyx_c_pow{{func_suffix}}({{type}} a, {{type}} b) {
+            {{type}} z;
+            {{real_type}} r, lnr, theta, z_r, z_theta;
+            if (b.imag == 0 && b.real == (int)b.real) {
+                if (b.real < 0) {
+                    {{real_type}} denom = a.real * a.real + a.imag * a.imag;
+                    a.real = a.real / denom;
+                    a.imag = -a.imag / denom;
+                    b.real = -b.real;
+                }
+                switch ((int)b.real) {
+                    case 0:
+                        z.real = 1;
+                        z.imag = 0;
+                        return z;
+                    case 1:
+                        return a;
+                    case 2:
+                        return __Pyx_c_prod{{func_suffix}}(a, a);
+                    case 3:
+                        z = __Pyx_c_prod{{func_suffix}}(a, a);
+                        return __Pyx_c_prod{{func_suffix}}(z, a);
+                    case 4:
+                        z = __Pyx_c_prod{{func_suffix}}(a, a);
+                        return __Pyx_c_prod{{func_suffix}}(z, z);
+                }
+            }
+            if (a.imag == 0) {
+                if (a.real == 0) {
+                    return a;
+                } else if ((b.imag == 0) && (a.real >= 0)) {
+                    z.real = pow{{m}}(a.real, b.real);
+                    z.imag = 0;
+                    return z;
+                } else if (a.real > 0) {
+                    r = a.real;
+                    theta = 0;
+                } else {
+                    r = -a.real;
+                    theta = atan2{{m}}(0.0, -1.0);
+                }
+            } else {
+                r = __Pyx_c_abs{{func_suffix}}(a);
+                theta = atan2{{m}}(a.imag, a.real);
+            }
+            lnr = log{{m}}(r);
+            z_r = exp{{m}}(lnr * b.real - theta * b.imag);
+            z_theta = theta * b.real + lnr * b.imag;
+            z.real = z_r * cos{{m}}(z_theta);
+            z.imag = z_r * sin{{m}}(z_theta);
+            return z;
+        }
+    #endif
+#endif
+
+/////////////// SoftComplexToDouble.proto //////////////////
+
+static double __Pyx_SoftComplexToDouble(__pyx_t_double_complex value, int have_gil); /* proto */
+
+/////////////// SoftComplexToDouble //////////////////
+//@requires: RealImag
+
+static double __Pyx_SoftComplexToDouble(__pyx_t_double_complex value, int have_gil) {
+    // This isn't an absolutely perfect match for the Python behaviour:
+    // In Python the type would be determined right after the number is
+    // created (usually '**'), while here it's determined when coerced
+    // to a PyObject, which may be a few operations later.
+    if (unlikely(__Pyx_CIMAG(value))) {
+        PyGILState_STATE gilstate;
+        if (!have_gil)
+            gilstate = PyGILState_Ensure();
+        PyErr_SetString(PyExc_TypeError,
+            "Cannot convert 'complex' with non-zero imaginary component to 'double' "
+            "(this most likely comes from the '**' operator; "
+            "use 'cython.cpow(True)' to return 'nan' instead of a "
+            "complex number).");
+        if (!have_gil)
+            PyGILState_Release(gilstate);
+        return -1.;
+    }
+    return __Pyx_CREAL(value);
+}
+
+///////// SoftComplexToPy.proto ///////////////////////
+
+static PyObject *__pyx_Py_FromSoftComplex(__pyx_t_double_complex value); /* proto */
+
+//////// SoftComplexToPy ////////////////
+//@requires: RealImag
+
+static PyObject *__pyx_Py_FromSoftComplex(__pyx_t_double_complex value) {
+    if (__Pyx_CIMAG(value)) {
+        return PyComplex_FromDoubles(__Pyx_CREAL(value), __Pyx_CIMAG(value));
+    } else {
+        return PyFloat_FromDouble(__Pyx_CREAL(value));
+    }
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/Coroutine.c b/contrib/tools/cython_py2/Cython/Utility/Coroutine.c
new file mode 100644
index 00000000000..1aecf1d5e6b
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Coroutine.c
@@ -0,0 +1,2635 @@
+//////////////////// GeneratorYieldFrom.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_Generator_Yield_From(__pyx_CoroutineObject *gen, PyObject *source);
+
+//////////////////// GeneratorYieldFrom ////////////////////
+//@requires: Generator
+
+#if CYTHON_USE_TYPE_SLOTS
+static void __Pyx_PyIter_CheckErrorAndDecref(PyObject *source) {
+    __Pyx_TypeName source_type_name = __Pyx_PyType_GetName(Py_TYPE(source));
+    PyErr_Format(PyExc_TypeError,
+        "iter() returned non-iterator of type '" __Pyx_FMT_TYPENAME "'", source_type_name);
+    __Pyx_DECREF_TypeName(source_type_name);
+    Py_DECREF(source);
+}
+#endif
+
+static CYTHON_INLINE PyObject* __Pyx_Generator_Yield_From(__pyx_CoroutineObject *gen, PyObject *source) {
+    PyObject *source_gen, *retval;
+#ifdef __Pyx_Coroutine_USED
+    if (__Pyx_Coroutine_Check(source)) {
+        // TODO: this should only happen for types.coroutine()ed generators, but we can't determine that here
+        Py_INCREF(source);
+        source_gen = source;
+        retval = __Pyx_Generator_Next(source);
+    } else
+#endif
+    {
+#if CYTHON_USE_TYPE_SLOTS
+        if (likely(Py_TYPE(source)->tp_iter)) {
+            source_gen = Py_TYPE(source)->tp_iter(source);
+            if (unlikely(!source_gen))
+                return NULL;
+            if (unlikely(!PyIter_Check(source_gen))) {
+                __Pyx_PyIter_CheckErrorAndDecref(source_gen);
+                return NULL;
+            }
+        } else
+        // CPython also allows non-iterable sequences to be iterated over
+#endif
+        {
+            source_gen = PyObject_GetIter(source);
+            if (unlikely(!source_gen))
+                return NULL;
+        }
+        // source_gen is now the iterator, make the first next() call
+        retval = __Pyx_PyObject_GetIterNextFunc(source_gen)(source_gen);
+    }
+    if (likely(retval)) {
+        gen->yieldfrom = source_gen;
+        return retval;
+    }
+    Py_DECREF(source_gen);
+    return NULL;
+}
+
+
+//////////////////// CoroutineYieldFrom.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_Coroutine_Yield_From(__pyx_CoroutineObject *gen, PyObject *source);
+
+//////////////////// CoroutineYieldFrom ////////////////////
+//@requires: Coroutine
+//@requires: GetAwaitIter
+
+static PyObject* __Pyx__Coroutine_Yield_From_Generic(__pyx_CoroutineObject *gen, PyObject *source) {
+    PyObject *retval;
+    PyObject *source_gen = __Pyx__Coroutine_GetAwaitableIter(source);
+    if (unlikely(!source_gen)) {
+        return NULL;
+    }
+    // source_gen is now the iterator, make the first next() call
+    if (__Pyx_Coroutine_Check(source_gen)) {
+        retval = __Pyx_Generator_Next(source_gen);
+    } else {
+        retval = __Pyx_PyObject_GetIterNextFunc(source_gen)(source_gen);
+    }
+    if (retval) {
+        gen->yieldfrom = source_gen;
+        return retval;
+    }
+    Py_DECREF(source_gen);
+    return NULL;
+}
+
+static CYTHON_INLINE PyObject* __Pyx_Coroutine_Yield_From(__pyx_CoroutineObject *gen, PyObject *source) {
+    PyObject *retval;
+    if (__Pyx_Coroutine_Check(source)) {
+        if (unlikely(((__pyx_CoroutineObject*)source)->yieldfrom)) {
+            PyErr_SetString(
+                PyExc_RuntimeError,
+                "coroutine is being awaited already");
+            return NULL;
+        }
+        retval = __Pyx_Generator_Next(source);
+#ifdef __Pyx_AsyncGen_USED
+    // inlined "__pyx_PyAsyncGenASend" handling to avoid the series of generic calls
+    } else if (__pyx_PyAsyncGenASend_CheckExact(source)) {
+        retval = __Pyx_async_gen_asend_iternext(source);
+#endif
+    } else {
+        return __Pyx__Coroutine_Yield_From_Generic(gen, source);
+    }
+    if (retval) {
+        Py_INCREF(source);
+        gen->yieldfrom = source;
+    }
+    return retval;
+}
+
+
+//////////////////// GetAwaitIter.proto ////////////////////
+
+static CYTHON_INLINE PyObject *__Pyx_Coroutine_GetAwaitableIter(PyObject *o); /*proto*/
+static PyObject *__Pyx__Coroutine_GetAwaitableIter(PyObject *o); /*proto*/
+
+//////////////////// GetAwaitIter ////////////////////
+//@requires: ObjectHandling.c::PyObjectGetMethod
+//@requires: ObjectHandling.c::PyObjectCallNoArg
+//@requires: ObjectHandling.c::PyObjectCallOneArg
+
+static CYTHON_INLINE PyObject *__Pyx_Coroutine_GetAwaitableIter(PyObject *o) {
+#ifdef __Pyx_Coroutine_USED
+    if (__Pyx_Coroutine_Check(o)) {
+        return __Pyx_NewRef(o);
+    }
+#endif
+    return __Pyx__Coroutine_GetAwaitableIter(o);
+}
+
+
+static void __Pyx_Coroutine_AwaitableIterError(PyObject *source) {
+#if PY_VERSION_HEX >= 0x030600B3 && PY_VERSION_HEX < 0x030d0000 || defined(_PyErr_FormatFromCause)
+    __Pyx_TypeName source_type_name = __Pyx_PyType_GetName(Py_TYPE(source));
+    _PyErr_FormatFromCause(PyExc_TypeError,
+        "'async for' received an invalid object from __anext__: " __Pyx_FMT_TYPENAME, source_type_name);
+    __Pyx_DECREF_TypeName(source_type_name);
+#elif PY_MAJOR_VERSION >= 3
+    PyObject *exc, *val, *val2, *tb;
+    __Pyx_TypeName source_type_name = __Pyx_PyType_GetName(Py_TYPE(source));
+    assert(PyErr_Occurred());
+    PyErr_Fetch(&exc, &val, &tb);
+    PyErr_NormalizeException(&exc, &val, &tb);
+    if (tb != NULL) {
+        PyException_SetTraceback(val, tb);
+        Py_DECREF(tb);
+    }
+    Py_DECREF(exc);
+    assert(!PyErr_Occurred());
+    PyErr_Format(PyExc_TypeError,
+        "'async for' received an invalid object from __anext__: " __Pyx_FMT_TYPENAME, source_type_name);
+    __Pyx_DECREF_TypeName(source_type_name);
+
+    PyErr_Fetch(&exc, &val2, &tb);
+    PyErr_NormalizeException(&exc, &val2, &tb);
+    Py_INCREF(val);
+    PyException_SetCause(val2, val);
+    PyException_SetContext(val2, val);
+    PyErr_Restore(exc, val2, tb);
+#else
+    // since Py2 does not have exception chaining, it's better to avoid shadowing exceptions there
+    CYTHON_UNUSED_VAR(source);
+#endif
+}
+
+// adapted from genobject.c in Py3.5
+static PyObject *__Pyx__Coroutine_GetAwaitableIter(PyObject *obj) {
+    PyObject *res;
+#if CYTHON_USE_ASYNC_SLOTS
+    __Pyx_PyAsyncMethodsStruct* am = __Pyx_PyType_AsAsync(obj);
+    if (likely(am && am->am_await)) {
+        res = (*am->am_await)(obj);
+    } else
+#endif
+#if PY_VERSION_HEX >= 0x030500B2 || defined(PyCoro_CheckExact)
+    if (PyCoro_CheckExact(obj)) {
+        return __Pyx_NewRef(obj);
+    } else
+#endif
+#if CYTHON_COMPILING_IN_CPYTHON && defined(CO_ITERABLE_COROUTINE)
+#if PY_VERSION_HEX >= 0x030C00A6
+    if (PyGen_CheckExact(obj) && (PyGen_GetCode((PyGenObject*)obj)->co_flags & CO_ITERABLE_COROUTINE)) {
+#else
+    if (PyGen_CheckExact(obj) && ((PyGenObject*)obj)->gi_code && ((PyCodeObject *)((PyGenObject*)obj)->gi_code)->co_flags & CO_ITERABLE_COROUTINE) {
+#endif
+        // Python generator marked with "@types.coroutine" decorator
+        return __Pyx_NewRef(obj);
+    } else
+#endif
+    {
+        PyObject *method = NULL;
+        int is_method = __Pyx_PyObject_GetMethod(obj, PYIDENT("__await__"), &method);
+        if (likely(is_method)) {
+            res = __Pyx_PyObject_CallOneArg(method, obj);
+        } else if (likely(method)) {
+            res = __Pyx_PyObject_CallNoArg(method);
+        } else
+            goto slot_error;
+        Py_DECREF(method);
+    }
+    if (unlikely(!res)) {
+        // surprisingly, CPython replaces the exception here...
+        __Pyx_Coroutine_AwaitableIterError(obj);
+        goto bad;
+    }
+    if (unlikely(!PyIter_Check(res))) {
+        __Pyx_TypeName res_type_name = __Pyx_PyType_GetName(Py_TYPE(res));
+        PyErr_Format(PyExc_TypeError,
+            "__await__() returned non-iterator of type '" __Pyx_FMT_TYPENAME "'", res_type_name);
+        __Pyx_DECREF_TypeName(res_type_name);
+        Py_CLEAR(res);
+    } else {
+        int is_coroutine = 0;
+        #ifdef __Pyx_Coroutine_USED
+        is_coroutine |= __Pyx_Coroutine_Check(res);
+        #endif
+        #if PY_VERSION_HEX >= 0x030500B2 || defined(PyCoro_CheckExact)
+        is_coroutine |= PyCoro_CheckExact(res);
+        #endif
+        if (unlikely(is_coroutine)) {
+            /* __await__ must return an *iterator*, not
+               a coroutine or another awaitable (see PEP 492) */
+            PyErr_SetString(PyExc_TypeError,
+                            "__await__() returned a coroutine");
+            Py_CLEAR(res);
+        }
+    }
+    return res;
+slot_error:
+    {
+        __Pyx_TypeName obj_type_name = __Pyx_PyType_GetName(Py_TYPE(obj));
+        PyErr_Format(PyExc_TypeError,
+            "object " __Pyx_FMT_TYPENAME " can't be used in 'await' expression", obj_type_name);
+        __Pyx_DECREF_TypeName(obj_type_name);
+    }
+bad:
+    return NULL;
+}
+
+
+//////////////////// AsyncIter.proto ////////////////////
+
+static CYTHON_INLINE PyObject *__Pyx_Coroutine_GetAsyncIter(PyObject *o); /*proto*/
+static CYTHON_INLINE PyObject *__Pyx_Coroutine_AsyncIterNext(PyObject *o); /*proto*/
+
+//////////////////// AsyncIter ////////////////////
+//@requires: GetAwaitIter
+//@requires: ObjectHandling.c::PyObjectCallMethod0
+
+static PyObject *__Pyx_Coroutine_GetAsyncIter_Generic(PyObject *obj) {
+    __Pyx_TypeName obj_type_name;
+#if PY_VERSION_HEX < 0x030500B1
+    {
+        PyObject *iter = __Pyx_PyObject_CallMethod0(obj, PYIDENT("__aiter__"));
+        if (likely(iter))
+            return iter;
+        // FIXME: for the sake of a nicely conforming exception message, assume any AttributeError meant '__aiter__'
+        if (!PyErr_ExceptionMatches(PyExc_AttributeError))
+            return NULL;
+    }
+#else
+    // avoid C warning about 'unused function'
+    (void)&__Pyx_PyObject_CallMethod0;
+#endif
+
+    obj_type_name = __Pyx_PyType_GetName(Py_TYPE(obj));
+    PyErr_Format(PyExc_TypeError,
+                 "'async for' requires an object with __aiter__ method, got " __Pyx_FMT_TYPENAME, obj_type_name);
+    __Pyx_DECREF_TypeName(obj_type_name);
+    return NULL;
+}
+
+
+static CYTHON_INLINE PyObject *__Pyx_Coroutine_GetAsyncIter(PyObject *obj) {
+#ifdef __Pyx_AsyncGen_USED
+    if (__Pyx_AsyncGen_CheckExact(obj)) {
+        return __Pyx_NewRef(obj);
+    }
+#endif
+#if CYTHON_USE_ASYNC_SLOTS
+    {
+        __Pyx_PyAsyncMethodsStruct* am = __Pyx_PyType_AsAsync(obj);
+        if (likely(am && am->am_aiter)) {
+            return (*am->am_aiter)(obj);
+        }
+    }
+#endif
+    return __Pyx_Coroutine_GetAsyncIter_Generic(obj);
+}
+
+
+static PyObject *__Pyx__Coroutine_AsyncIterNext(PyObject *obj) {
+#if PY_VERSION_HEX < 0x030500B1
+    {
+        PyObject *value = __Pyx_PyObject_CallMethod0(obj, PYIDENT("__anext__"));
+        if (likely(value))
+            return value;
+    }
+    // FIXME: for the sake of a nicely conforming exception message, assume any AttributeError meant '__anext__'
+    if (PyErr_ExceptionMatches(PyExc_AttributeError))
+#endif
+    {
+        __Pyx_TypeName obj_type_name = __Pyx_PyType_GetName(Py_TYPE(obj));
+        PyErr_Format(PyExc_TypeError,
+            "'async for' requires an object with __anext__ method, got " __Pyx_FMT_TYPENAME, obj_type_name);
+        __Pyx_DECREF_TypeName(obj_type_name);
+    }
+    return NULL;
+}
+
+
+static CYTHON_INLINE PyObject *__Pyx_Coroutine_AsyncIterNext(PyObject *obj) {
+#ifdef __Pyx_AsyncGen_USED
+    if (__Pyx_AsyncGen_CheckExact(obj)) {
+        return __Pyx_async_gen_anext(obj);
+    }
+#endif
+#if CYTHON_USE_ASYNC_SLOTS
+    {
+        __Pyx_PyAsyncMethodsStruct* am = __Pyx_PyType_AsAsync(obj);
+        if (likely(am && am->am_anext)) {
+            return (*am->am_anext)(obj);
+        }
+    }
+#endif
+    return __Pyx__Coroutine_AsyncIterNext(obj);
+}
+
+
+//////////////////// pep479.proto ////////////////////
+
+static void __Pyx_Generator_Replace_StopIteration(int in_async_gen); /*proto*/
+
+//////////////////// pep479 ////////////////////
+//@requires: Exceptions.c::GetException
+
+static void __Pyx_Generator_Replace_StopIteration(int in_async_gen) {
+    PyObject *exc, *val, *tb, *cur_exc;
+    __Pyx_PyThreadState_declare
+    #ifdef __Pyx_StopAsyncIteration_USED
+    int is_async_stopiteration = 0;
+    #endif
+    CYTHON_MAYBE_UNUSED_VAR(in_async_gen);
+
+    cur_exc = PyErr_Occurred();
+    if (likely(!__Pyx_PyErr_GivenExceptionMatches(cur_exc, PyExc_StopIteration))) {
+        #ifdef __Pyx_StopAsyncIteration_USED
+        if (in_async_gen && unlikely(__Pyx_PyErr_GivenExceptionMatches(cur_exc, __Pyx_PyExc_StopAsyncIteration))) {
+            is_async_stopiteration = 1;
+        } else
+        #endif
+            return;
+    }
+
+    __Pyx_PyThreadState_assign
+    // Chain exceptions by moving Stop(Async)Iteration to exc_info before creating the RuntimeError.
+    // In Py2.x, no chaining happens, but the exception still stays visible in exc_info.
+    __Pyx_GetException(&exc, &val, &tb);
+    Py_XDECREF(exc);
+    Py_XDECREF(val);
+    Py_XDECREF(tb);
+    PyErr_SetString(PyExc_RuntimeError,
+        #ifdef __Pyx_StopAsyncIteration_USED
+        is_async_stopiteration ? "async generator raised StopAsyncIteration" :
+        in_async_gen ? "async generator raised StopIteration" :
+        #endif
+        "generator raised StopIteration");
+}
+
+
+//////////////////// CoroutineBase.proto ////////////////////
+//@substitute: naming
+
+struct __pyx_CoroutineObject;
+typedef PyObject *(*__pyx_coroutine_body_t)(struct __pyx_CoroutineObject *, PyThreadState *, PyObject *);
+
+#if CYTHON_USE_EXC_INFO_STACK
+// See  https://bugs.python.org/issue25612
+#define __Pyx_ExcInfoStruct  _PyErr_StackItem
+#else
+// Minimal replacement struct for Py<3.7, without the Py3.7 exception state stack.
+typedef struct {
+    PyObject *exc_type;
+    PyObject *exc_value;
+    PyObject *exc_traceback;
+} __Pyx_ExcInfoStruct;
+#endif
+
+typedef struct __pyx_CoroutineObject {
+    PyObject_HEAD
+    __pyx_coroutine_body_t body;
+    PyObject *closure;
+    __Pyx_ExcInfoStruct gi_exc_state;
+    PyObject *gi_weakreflist;
+    PyObject *classobj;
+    PyObject *yieldfrom;
+    PyObject *gi_name;
+    PyObject *gi_qualname;
+    PyObject *gi_modulename;
+    PyObject *gi_code;
+    PyObject *gi_frame;
+    int resume_label;
+    // using T_BOOL for property below requires char value
+    char is_running;
+} __pyx_CoroutineObject;
+
+static __pyx_CoroutineObject *__Pyx__Coroutine_New(
+    PyTypeObject *type, __pyx_coroutine_body_t body, PyObject *code, PyObject *closure,
+    PyObject *name, PyObject *qualname, PyObject *module_name); /*proto*/
+
+static __pyx_CoroutineObject *__Pyx__Coroutine_NewInit(
+            __pyx_CoroutineObject *gen, __pyx_coroutine_body_t body, PyObject *code, PyObject *closure,
+            PyObject *name, PyObject *qualname, PyObject *module_name); /*proto*/
+
+static CYTHON_INLINE void __Pyx_Coroutine_ExceptionClear(__Pyx_ExcInfoStruct *self);
+static int __Pyx_Coroutine_clear(PyObject *self); /*proto*/
+static PyObject *__Pyx_Coroutine_Send(PyObject *self, PyObject *value); /*proto*/
+static PyObject *__Pyx_Coroutine_Close(PyObject *self); /*proto*/
+static PyObject *__Pyx_Coroutine_Throw(PyObject *gen, PyObject *args); /*proto*/
+
+// macros for exception state swapping instead of inline functions to make use of the local thread state context
+#if CYTHON_USE_EXC_INFO_STACK
+#define __Pyx_Coroutine_SwapException(self)
+#define __Pyx_Coroutine_ResetAndClearException(self)  __Pyx_Coroutine_ExceptionClear(&(self)->gi_exc_state)
+#else
+#define __Pyx_Coroutine_SwapException(self) { \
+    __Pyx_ExceptionSwap(&(self)->gi_exc_state.exc_type, &(self)->gi_exc_state.exc_value, &(self)->gi_exc_state.exc_traceback); \
+    __Pyx_Coroutine_ResetFrameBackpointer(&(self)->gi_exc_state); \
+    }
+#define __Pyx_Coroutine_ResetAndClearException(self) { \
+    __Pyx_ExceptionReset((self)->gi_exc_state.exc_type, (self)->gi_exc_state.exc_value, (self)->gi_exc_state.exc_traceback); \
+    (self)->gi_exc_state.exc_type = (self)->gi_exc_state.exc_value = (self)->gi_exc_state.exc_traceback = NULL; \
+    }
+#endif
+
+#if CYTHON_FAST_THREAD_STATE
+#define __Pyx_PyGen_FetchStopIterationValue(pvalue) \
+    __Pyx_PyGen__FetchStopIterationValue($local_tstate_cname, pvalue)
+#else
+#define __Pyx_PyGen_FetchStopIterationValue(pvalue) \
+    __Pyx_PyGen__FetchStopIterationValue(__Pyx_PyThreadState_Current, pvalue)
+#endif
+static int __Pyx_PyGen__FetchStopIterationValue(PyThreadState *tstate, PyObject **pvalue); /*proto*/
+static CYTHON_INLINE void __Pyx_Coroutine_ResetFrameBackpointer(__Pyx_ExcInfoStruct *exc_state); /*proto*/
+
+
+//////////////////// Coroutine.proto ////////////////////
+
+#define __Pyx_Coroutine_USED
+#define __Pyx_Coroutine_CheckExact(obj) __Pyx_IS_TYPE(obj, __pyx_CoroutineType)
+// __Pyx_Coroutine_Check(obj): see override for IterableCoroutine below
+#define __Pyx_Coroutine_Check(obj) __Pyx_Coroutine_CheckExact(obj)
+#define __Pyx_CoroutineAwait_CheckExact(obj) __Pyx_IS_TYPE(obj, __pyx_CoroutineAwaitType)
+
+#define __Pyx_Coroutine_New(body, code, closure, name, qualname, module_name)  \
+    __Pyx__Coroutine_New(__pyx_CoroutineType, body, code, closure, name, qualname, module_name)
+
+static int __pyx_Coroutine_init(PyObject *module); /*proto*/
+static PyObject *__Pyx__Coroutine_await(PyObject *coroutine); /*proto*/
+
+typedef struct {
+    PyObject_HEAD
+    PyObject *coroutine;
+} __pyx_CoroutineAwaitObject;
+
+static PyObject *__Pyx_CoroutineAwait_Close(__pyx_CoroutineAwaitObject *self, PyObject *arg); /*proto*/
+static PyObject *__Pyx_CoroutineAwait_Throw(__pyx_CoroutineAwaitObject *self, PyObject *args); /*proto*/
+
+
+//////////////////// Generator.proto ////////////////////
+
+#define __Pyx_Generator_USED
+#define __Pyx_Generator_CheckExact(obj) __Pyx_IS_TYPE(obj, __pyx_GeneratorType)
+
+#define __Pyx_Generator_New(body, code, closure, name, qualname, module_name)  \
+    __Pyx__Coroutine_New(__pyx_GeneratorType, body, code, closure, name, qualname, module_name)
+
+static PyObject *__Pyx_Generator_Next(PyObject *self);
+static int __pyx_Generator_init(PyObject *module); /*proto*/
+
+
+//////////////////// AsyncGen ////////////////////
+//@requires: AsyncGen.c::AsyncGenerator
+// -> empty, only delegates to separate file
+
+
+//////////////////// CoroutineBase ////////////////////
+//@substitute: naming
+//@requires: Exceptions.c::PyErrFetchRestore
+//@requires: Exceptions.c::PyThreadStateGet
+//@requires: Exceptions.c::SwapException
+//@requires: Exceptions.c::RaiseException
+//@requires: Exceptions.c::SaveResetException
+//@requires: ObjectHandling.c::PyObjectCallMethod1
+//@requires: ObjectHandling.c::PyObjectCallNoArg
+//@requires: ObjectHandling.c::PyObjectCallOneArg
+//@requires: ObjectHandling.c::PyObjectFastCall
+//@requires: ObjectHandling.c::PyObjectGetAttrStr
+//@requires: ObjectHandling.c::PyObjectGetAttrStrNoError
+//@requires: CommonStructures.c::FetchCommonType
+//@requires: ModuleSetupCode.c::IncludeStructmemberH
+
+#include <frameobject.h>
+#if PY_VERSION_HEX >= 0x030b00a6 && !defined(PYPY_VERSION)
+  #ifndef Py_BUILD_CORE
+    #define Py_BUILD_CORE 1
+  #endif
+  #include "internal/pycore_frame.h"
+#endif
+
+#define __Pyx_Coroutine_Undelegate(gen) Py_CLEAR((gen)->yieldfrom)
+
+//   If StopIteration exception is set, fetches its 'value'
+//   attribute if any, otherwise sets pvalue to None.
+//
+//   Returns 0 if no exception or StopIteration is set.
+//   If any other exception is set, returns -1 and leaves
+//   pvalue unchanged.
+static int __Pyx_PyGen__FetchStopIterationValue(PyThreadState *$local_tstate_cname, PyObject **pvalue) {
+    PyObject *et, *ev, *tb;
+    PyObject *value = NULL;
+    CYTHON_UNUSED_VAR($local_tstate_cname);
+
+    __Pyx_ErrFetch(&et, &ev, &tb);
+
+    if (!et) {
+        Py_XDECREF(tb);
+        Py_XDECREF(ev);
+        Py_INCREF(Py_None);
+        *pvalue = Py_None;
+        return 0;
+    }
+
+    // most common case: plain StopIteration without or with separate argument
+    if (likely(et == PyExc_StopIteration)) {
+        if (!ev) {
+            Py_INCREF(Py_None);
+            value = Py_None;
+        }
+#if PY_VERSION_HEX >= 0x030300A0
+        else if (likely(__Pyx_IS_TYPE(ev, (PyTypeObject*)PyExc_StopIteration))) {
+            value = ((PyStopIterationObject *)ev)->value;
+            Py_INCREF(value);
+            Py_DECREF(ev);
+        }
+#endif
+        // PyErr_SetObject() and friends put the value directly into ev
+        else if (unlikely(PyTuple_Check(ev))) {
+            // if it's a tuple, it is interpreted as separate constructor arguments (surprise!)
+            if (PyTuple_GET_SIZE(ev) >= 1) {
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+                value = PyTuple_GET_ITEM(ev, 0);
+                Py_INCREF(value);
+#else
+                value = PySequence_ITEM(ev, 0);
+#endif
+            } else {
+                Py_INCREF(Py_None);
+                value = Py_None;
+            }
+            Py_DECREF(ev);
+        }
+        else if (!__Pyx_TypeCheck(ev, (PyTypeObject*)PyExc_StopIteration)) {
+            // 'steal' reference to ev
+            value = ev;
+        }
+        if (likely(value)) {
+            Py_XDECREF(tb);
+            Py_DECREF(et);
+            *pvalue = value;
+            return 0;
+        }
+    } else if (!__Pyx_PyErr_GivenExceptionMatches(et, PyExc_StopIteration)) {
+        __Pyx_ErrRestore(et, ev, tb);
+        return -1;
+    }
+
+    // otherwise: normalise and check what that gives us
+    PyErr_NormalizeException(&et, &ev, &tb);
+    if (unlikely(!PyObject_TypeCheck(ev, (PyTypeObject*)PyExc_StopIteration))) {
+        // looks like normalisation failed - raise the new exception
+        __Pyx_ErrRestore(et, ev, tb);
+        return -1;
+    }
+    Py_XDECREF(tb);
+    Py_DECREF(et);
+#if PY_VERSION_HEX >= 0x030300A0
+    value = ((PyStopIterationObject *)ev)->value;
+    Py_INCREF(value);
+    Py_DECREF(ev);
+#else
+    {
+        PyObject* args = __Pyx_PyObject_GetAttrStr(ev, PYIDENT("args"));
+        Py_DECREF(ev);
+        if (likely(args)) {
+            value = PySequence_GetItem(args, 0);
+            Py_DECREF(args);
+        }
+        if (unlikely(!value)) {
+            __Pyx_ErrRestore(NULL, NULL, NULL);
+            Py_INCREF(Py_None);
+            value = Py_None;
+        }
+    }
+#endif
+    *pvalue = value;
+    return 0;
+}
+
+static CYTHON_INLINE
+void __Pyx_Coroutine_ExceptionClear(__Pyx_ExcInfoStruct *exc_state) {
+#if PY_VERSION_HEX >= 0x030B00a4
+    Py_CLEAR(exc_state->exc_value);
+#else
+    PyObject *t, *v, *tb;
+    t = exc_state->exc_type;
+    v = exc_state->exc_value;
+    tb = exc_state->exc_traceback;
+
+    exc_state->exc_type = NULL;
+    exc_state->exc_value = NULL;
+    exc_state->exc_traceback = NULL;
+
+    Py_XDECREF(t);
+    Py_XDECREF(v);
+    Py_XDECREF(tb);
+#endif
+}
+
+#define __Pyx_Coroutine_AlreadyRunningError(gen)  (__Pyx__Coroutine_AlreadyRunningError(gen), (PyObject*)NULL)
+static void __Pyx__Coroutine_AlreadyRunningError(__pyx_CoroutineObject *gen) {
+    const char *msg;
+    CYTHON_MAYBE_UNUSED_VAR(gen);
+    if ((0)) {
+    #ifdef __Pyx_Coroutine_USED
+    } else if (__Pyx_Coroutine_Check((PyObject*)gen)) {
+        msg = "coroutine already executing";
+    #endif
+    #ifdef __Pyx_AsyncGen_USED
+    } else if (__Pyx_AsyncGen_CheckExact((PyObject*)gen)) {
+        msg = "async generator already executing";
+    #endif
+    } else {
+        msg = "generator already executing";
+    }
+    PyErr_SetString(PyExc_ValueError, msg);
+}
+
+#define __Pyx_Coroutine_NotStartedError(gen)  (__Pyx__Coroutine_NotStartedError(gen), (PyObject*)NULL)
+static void __Pyx__Coroutine_NotStartedError(PyObject *gen) {
+    const char *msg;
+    CYTHON_MAYBE_UNUSED_VAR(gen);
+    if ((0)) {
+    #ifdef __Pyx_Coroutine_USED
+    } else if (__Pyx_Coroutine_Check(gen)) {
+        msg = "can't send non-None value to a just-started coroutine";
+    #endif
+    #ifdef __Pyx_AsyncGen_USED
+    } else if (__Pyx_AsyncGen_CheckExact(gen)) {
+        msg = "can't send non-None value to a just-started async generator";
+    #endif
+    } else {
+        msg = "can't send non-None value to a just-started generator";
+    }
+    PyErr_SetString(PyExc_TypeError, msg);
+}
+
+#define __Pyx_Coroutine_AlreadyTerminatedError(gen, value, closing)  (__Pyx__Coroutine_AlreadyTerminatedError(gen, value, closing), (PyObject*)NULL)
+static void __Pyx__Coroutine_AlreadyTerminatedError(PyObject *gen, PyObject *value, int closing) {
+    CYTHON_MAYBE_UNUSED_VAR(gen);
+    CYTHON_MAYBE_UNUSED_VAR(closing);
+    #ifdef __Pyx_Coroutine_USED
+    if (!closing && __Pyx_Coroutine_Check(gen)) {
+        // `self` is an exhausted coroutine: raise an error,
+        // except when called from gen_close(), which should
+        // always be a silent method.
+        PyErr_SetString(PyExc_RuntimeError, "cannot reuse already awaited coroutine");
+    } else
+    #endif
+    if (value) {
+        // `gen` is an exhausted generator:
+        // only set exception if called from send().
+        #ifdef __Pyx_AsyncGen_USED
+        if (__Pyx_AsyncGen_CheckExact(gen))
+            PyErr_SetNone(__Pyx_PyExc_StopAsyncIteration);
+        else
+        #endif
+        PyErr_SetNone(PyExc_StopIteration);
+    }
+}
+
+static
+PyObject *__Pyx_Coroutine_SendEx(__pyx_CoroutineObject *self, PyObject *value, int closing) {
+    __Pyx_PyThreadState_declare
+    PyThreadState *tstate;
+    __Pyx_ExcInfoStruct *exc_state;
+    PyObject *retval;
+
+    assert(!self->is_running);
+
+    if (unlikely(self->resume_label == 0)) {
+        if (unlikely(value && value != Py_None)) {
+            return __Pyx_Coroutine_NotStartedError((PyObject*)self);
+        }
+    }
+
+    if (unlikely(self->resume_label == -1)) {
+        return __Pyx_Coroutine_AlreadyTerminatedError((PyObject*)self, value, closing);
+    }
+
+#if CYTHON_FAST_THREAD_STATE
+    __Pyx_PyThreadState_assign
+    tstate = $local_tstate_cname;
+#else
+    tstate = __Pyx_PyThreadState_Current;
+#endif
+
+    // Traceback/Frame rules pre-Py3.7:
+    // - on entry, save external exception state in self->gi_exc_state, restore it on exit
+    // - on exit, keep internally generated exceptions in self->gi_exc_state, clear everything else
+    // - on entry, set "f_back" pointer of internal exception traceback to (current) outer call frame
+    // - on exit, clear "f_back" of internal exception traceback
+    // - do not touch external frames and tracebacks
+
+    // Traceback/Frame rules for Py3.7+ (CYTHON_USE_EXC_INFO_STACK):
+    // - on entry, push internal exception state in self->gi_exc_state on the exception stack
+    // - on exit, keep internally generated exceptions in self->gi_exc_state, clear everything else
+    // - on entry, set "f_back" pointer of internal exception traceback to (current) outer call frame
+    // - on exit, clear "f_back" of internal exception traceback
+    // - do not touch external frames and tracebacks
+
+    exc_state = &self->gi_exc_state;
+    if (exc_state->exc_value) {
+        #if CYTHON_COMPILING_IN_PYPY
+        // FIXME: what to do in PyPy?
+        #else
+        // Generators always return to their most recent caller, not
+        // necessarily their creator.
+        PyObject *exc_tb;
+        #if PY_VERSION_HEX >= 0x030B00a4 && !CYTHON_COMPILING_IN_CPYTHON
+        // owned reference!
+        exc_tb = PyException_GetTraceback(exc_state->exc_value);
+        #elif PY_VERSION_HEX >= 0x030B00a4
+        exc_tb = ((PyBaseExceptionObject*) exc_state->exc_value)->traceback;
+        #else
+        exc_tb = exc_state->exc_traceback;
+        #endif
+        if (exc_tb) {
+            PyTracebackObject *tb = (PyTracebackObject *) exc_tb;
+            PyFrameObject *f = tb->tb_frame;
+
+            assert(f->f_back == NULL);
+            #if PY_VERSION_HEX >= 0x030B00A1
+            // PyThreadState_GetFrame returns NULL if there isn't a current frame
+            // which is a valid state so no need to check
+            f->f_back = PyThreadState_GetFrame(tstate);
+            #else
+            Py_XINCREF(tstate->frame);
+            f->f_back = tstate->frame;
+            #endif
+            #if PY_VERSION_HEX >= 0x030B00a4 && !CYTHON_COMPILING_IN_CPYTHON
+            Py_DECREF(exc_tb);
+            #endif
+        }
+        #endif
+    }
+
+#if CYTHON_USE_EXC_INFO_STACK
+    // See  https://bugs.python.org/issue25612
+    exc_state->previous_item = tstate->exc_info;
+    tstate->exc_info = exc_state;
+#else
+    if (exc_state->exc_type) {
+        // We were in an except handler when we left,
+        // restore the exception state which was put aside.
+        __Pyx_ExceptionSwap(&exc_state->exc_type, &exc_state->exc_value, &exc_state->exc_traceback);
+        // self->exc_* now holds the exception state of the caller
+    } else {
+        // save away the exception state of the caller
+        __Pyx_Coroutine_ExceptionClear(exc_state);
+        __Pyx_ExceptionSave(&exc_state->exc_type, &exc_state->exc_value, &exc_state->exc_traceback);
+    }
+#endif
+
+    self->is_running = 1;
+    retval = self->body(self, tstate, value);
+    self->is_running = 0;
+
+#if CYTHON_USE_EXC_INFO_STACK
+    // See  https://bugs.python.org/issue25612
+    exc_state = &self->gi_exc_state;
+    tstate->exc_info = exc_state->previous_item;
+    exc_state->previous_item = NULL;
+    // Cut off the exception frame chain so that we can reconnect it on re-entry above.
+    __Pyx_Coroutine_ResetFrameBackpointer(exc_state);
+#endif
+
+    return retval;
+}
+
+static CYTHON_INLINE void __Pyx_Coroutine_ResetFrameBackpointer(__Pyx_ExcInfoStruct *exc_state) {
+    // Don't keep the reference to f_back any longer than necessary.  It
+    // may keep a chain of frames alive or it could create a reference
+    // cycle.
+#if CYTHON_COMPILING_IN_PYPY
+    // FIXME: what to do in PyPy?
+    CYTHON_UNUSED_VAR(exc_state);
+#else
+    PyObject *exc_tb;
+
+    #if PY_VERSION_HEX >= 0x030B00a4
+    if (!exc_state->exc_value) return;
+    // owned reference!
+    exc_tb = PyException_GetTraceback(exc_state->exc_value);
+    #else
+    exc_tb = exc_state->exc_traceback;
+    #endif
+
+    if (likely(exc_tb)) {
+        PyTracebackObject *tb = (PyTracebackObject *) exc_tb;
+        PyFrameObject *f = tb->tb_frame;
+        Py_CLEAR(f->f_back);
+        #if PY_VERSION_HEX >= 0x030B00a4
+        Py_DECREF(exc_tb);
+        #endif
+    }
+#endif
+}
+
+static CYTHON_INLINE
+PyObject *__Pyx_Coroutine_MethodReturn(PyObject* gen, PyObject *retval) {
+    CYTHON_MAYBE_UNUSED_VAR(gen);
+    if (unlikely(!retval)) {
+        __Pyx_PyThreadState_declare
+        __Pyx_PyThreadState_assign
+        if (!__Pyx_PyErr_Occurred()) {
+            // method call must not terminate with NULL without setting an exception
+            PyObject *exc = PyExc_StopIteration;
+            #ifdef __Pyx_AsyncGen_USED
+            if (__Pyx_AsyncGen_CheckExact(gen))
+                exc = __Pyx_PyExc_StopAsyncIteration;
+            #endif
+            __Pyx_PyErr_SetNone(exc);
+        }
+    }
+    return retval;
+}
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x03030000 && (defined(__linux__) || PY_VERSION_HEX >= 0x030600B3)
+static CYTHON_INLINE
+PyObject *__Pyx_PyGen_Send(PyGenObject *gen, PyObject *arg) {
+#if PY_VERSION_HEX <= 0x030A00A1
+    return _PyGen_Send(gen, arg);
+#else
+    PyObject *result;
+    // PyIter_Send() asserts non-NULL arg
+    if (PyIter_Send((PyObject*)gen, arg ? arg : Py_None, &result) == PYGEN_RETURN) {
+        if (PyAsyncGen_CheckExact(gen)) {
+            assert(result == Py_None);
+            PyErr_SetNone(PyExc_StopAsyncIteration);
+        }
+        else if (result == Py_None) {
+            PyErr_SetNone(PyExc_StopIteration);
+        }
+        else {
+#if PY_VERSION_HEX < 0x030d00A1
+            _PyGen_SetStopIterationValue(result);
+#else
+            if (!PyTuple_Check(result) && !PyExceptionInstance_Check(result)) {
+                // delay instantiation if possible
+                PyErr_SetObject(PyExc_StopIteration, result);
+            } else {
+                PyObject *exc = __Pyx_PyObject_CallOneArg(PyExc_StopIteration, result);
+                if (likely(exc != NULL)) {
+                    PyErr_SetObject(PyExc_StopIteration, exc);
+                    Py_DECREF(exc);
+                }
+            }
+#endif
+        }
+        Py_DECREF(result);
+        result = NULL;
+    }
+    return result;
+#endif
+}
+#endif
+
+static CYTHON_INLINE
+PyObject *__Pyx_Coroutine_FinishDelegation(__pyx_CoroutineObject *gen) {
+    PyObject *ret;
+    PyObject *val = NULL;
+    __Pyx_Coroutine_Undelegate(gen);
+    __Pyx_PyGen__FetchStopIterationValue(__Pyx_PyThreadState_Current, &val);
+    // val == NULL on failure => pass on exception
+    ret = __Pyx_Coroutine_SendEx(gen, val, 0);
+    Py_XDECREF(val);
+    return ret;
+}
+
+static PyObject *__Pyx_Coroutine_Send(PyObject *self, PyObject *value) {
+    PyObject *retval;
+    __pyx_CoroutineObject *gen = (__pyx_CoroutineObject*) self;
+    PyObject *yf = gen->yieldfrom;
+    if (unlikely(gen->is_running))
+        return __Pyx_Coroutine_AlreadyRunningError(gen);
+    if (yf) {
+        PyObject *ret;
+        // FIXME: does this really need an INCREF() ?
+        //Py_INCREF(yf);
+        gen->is_running = 1;
+        #ifdef __Pyx_Generator_USED
+        if (__Pyx_Generator_CheckExact(yf)) {
+            ret = __Pyx_Coroutine_Send(yf, value);
+        } else
+        #endif
+        #ifdef __Pyx_Coroutine_USED
+        if (__Pyx_Coroutine_Check(yf)) {
+            ret = __Pyx_Coroutine_Send(yf, value);
+        } else
+        #endif
+        #ifdef __Pyx_AsyncGen_USED
+        if (__pyx_PyAsyncGenASend_CheckExact(yf)) {
+            ret = __Pyx_async_gen_asend_send(yf, value);
+        } else
+        #endif
+        #if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x03030000 && (defined(__linux__) || PY_VERSION_HEX >= 0x030600B3)
+        // _PyGen_Send() is not exported before Py3.6
+        if (PyGen_CheckExact(yf)) {
+            ret = __Pyx_PyGen_Send((PyGenObject*)yf, value == Py_None ? NULL : value);
+        } else
+        #endif
+        #if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x03050000 && defined(PyCoro_CheckExact) && (defined(__linux__) || PY_VERSION_HEX >= 0x030600B3)
+        // _PyGen_Send() is not exported before Py3.6
+        if (PyCoro_CheckExact(yf)) {
+            ret = __Pyx_PyGen_Send((PyGenObject*)yf, value == Py_None ? NULL : value);
+        } else
+        #endif
+        {
+            if (value == Py_None)
+                ret = __Pyx_PyObject_GetIterNextFunc(yf)(yf);
+            else
+                ret = __Pyx_PyObject_CallMethod1(yf, PYIDENT("send"), value);
+        }
+        gen->is_running = 0;
+        //Py_DECREF(yf);
+        if (likely(ret)) {
+            return ret;
+        }
+        retval = __Pyx_Coroutine_FinishDelegation(gen);
+    } else {
+        retval = __Pyx_Coroutine_SendEx(gen, value, 0);
+    }
+    return __Pyx_Coroutine_MethodReturn(self, retval);
+}
+
+//   This helper function is used by gen_close and gen_throw to
+//   close a subiterator being delegated to by yield-from.
+static int __Pyx_Coroutine_CloseIter(__pyx_CoroutineObject *gen, PyObject *yf) {
+    PyObject *retval = NULL;
+    int err = 0;
+
+    #ifdef __Pyx_Generator_USED
+    if (__Pyx_Generator_CheckExact(yf)) {
+        retval = __Pyx_Coroutine_Close(yf);
+        if (!retval)
+            return -1;
+    } else
+    #endif
+    #ifdef __Pyx_Coroutine_USED
+    if (__Pyx_Coroutine_Check(yf)) {
+        retval = __Pyx_Coroutine_Close(yf);
+        if (!retval)
+            return -1;
+    } else
+    if (__Pyx_CoroutineAwait_CheckExact(yf)) {
+        retval = __Pyx_CoroutineAwait_Close((__pyx_CoroutineAwaitObject*)yf, NULL);
+        if (!retval)
+            return -1;
+    } else
+    #endif
+    #ifdef __Pyx_AsyncGen_USED
+    if (__pyx_PyAsyncGenASend_CheckExact(yf)) {
+        retval = __Pyx_async_gen_asend_close(yf, NULL);
+        // cannot fail
+    } else
+    if (__pyx_PyAsyncGenAThrow_CheckExact(yf)) {
+        retval = __Pyx_async_gen_athrow_close(yf, NULL);
+        // cannot fail
+    } else
+    #endif
+    {
+        PyObject *meth;
+        gen->is_running = 1;
+        meth = __Pyx_PyObject_GetAttrStrNoError(yf, PYIDENT("close"));
+        if (unlikely(!meth)) {
+            if (unlikely(PyErr_Occurred())) {
+                PyErr_WriteUnraisable(yf);
+            }
+        } else {
+            retval = __Pyx_PyObject_CallNoArg(meth);
+            Py_DECREF(meth);
+            if (unlikely(!retval))
+                err = -1;
+        }
+        gen->is_running = 0;
+    }
+    Py_XDECREF(retval);
+    return err;
+}
+
+static PyObject *__Pyx_Generator_Next(PyObject *self) {
+    __pyx_CoroutineObject *gen = (__pyx_CoroutineObject*) self;
+    PyObject *yf = gen->yieldfrom;
+    if (unlikely(gen->is_running))
+        return __Pyx_Coroutine_AlreadyRunningError(gen);
+    if (yf) {
+        PyObject *ret;
+        // FIXME: does this really need an INCREF() ?
+        //Py_INCREF(yf);
+        // YieldFrom code ensures that yf is an iterator
+        gen->is_running = 1;
+        #ifdef __Pyx_Generator_USED
+        if (__Pyx_Generator_CheckExact(yf)) {
+            ret = __Pyx_Generator_Next(yf);
+        } else
+        #endif
+        #if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x03030000 && (defined(__linux__) || PY_VERSION_HEX >= 0x030600B3)
+        // _PyGen_Send() is not exported before Py3.6
+        if (PyGen_CheckExact(yf)) {
+            ret = __Pyx_PyGen_Send((PyGenObject*)yf, NULL);
+        } else
+        #endif
+        #ifdef __Pyx_Coroutine_USED
+        if (__Pyx_Coroutine_Check(yf)) {
+            ret = __Pyx_Coroutine_Send(yf, Py_None);
+        } else
+        #endif
+            ret = __Pyx_PyObject_GetIterNextFunc(yf)(yf);
+        gen->is_running = 0;
+        //Py_DECREF(yf);
+        if (likely(ret)) {
+            return ret;
+        }
+        return __Pyx_Coroutine_FinishDelegation(gen);
+    }
+    return __Pyx_Coroutine_SendEx(gen, Py_None, 0);
+}
+
+static PyObject *__Pyx_Coroutine_Close_Method(PyObject *self, PyObject *arg) {
+    CYTHON_UNUSED_VAR(arg);
+    return __Pyx_Coroutine_Close(self);
+}
+
+static PyObject *__Pyx_Coroutine_Close(PyObject *self) {
+    __pyx_CoroutineObject *gen = (__pyx_CoroutineObject *) self;
+    PyObject *retval, *raised_exception;
+    PyObject *yf = gen->yieldfrom;
+    int err = 0;
+
+    if (unlikely(gen->is_running))
+        return __Pyx_Coroutine_AlreadyRunningError(gen);
+
+    if (yf) {
+        Py_INCREF(yf);
+        err = __Pyx_Coroutine_CloseIter(gen, yf);
+        __Pyx_Coroutine_Undelegate(gen);
+        Py_DECREF(yf);
+    }
+    if (err == 0)
+        PyErr_SetNone(PyExc_GeneratorExit);
+    retval = __Pyx_Coroutine_SendEx(gen, NULL, 1);
+    if (unlikely(retval)) {
+        const char *msg;
+        Py_DECREF(retval);
+        if ((0)) {
+        #ifdef __Pyx_Coroutine_USED
+        } else if (__Pyx_Coroutine_Check(self)) {
+            msg = "coroutine ignored GeneratorExit";
+        #endif
+        #ifdef __Pyx_AsyncGen_USED
+        } else if (__Pyx_AsyncGen_CheckExact(self)) {
+#if PY_VERSION_HEX < 0x03060000
+            msg = "async generator ignored GeneratorExit - might require Python 3.6+ finalisation (PEP 525)";
+#else
+            msg = "async generator ignored GeneratorExit";
+#endif
+        #endif
+        } else {
+            msg = "generator ignored GeneratorExit";
+        }
+        PyErr_SetString(PyExc_RuntimeError, msg);
+        return NULL;
+    }
+    raised_exception = PyErr_Occurred();
+    if (likely(!raised_exception || __Pyx_PyErr_GivenExceptionMatches2(raised_exception, PyExc_GeneratorExit, PyExc_StopIteration))) {
+        // ignore these errors
+        if (raised_exception) PyErr_Clear();
+        Py_INCREF(Py_None);
+        return Py_None;
+    }
+    return NULL;
+}
+
+static PyObject *__Pyx__Coroutine_Throw(PyObject *self, PyObject *typ, PyObject *val, PyObject *tb,
+                                        PyObject *args, int close_on_genexit) {
+    __pyx_CoroutineObject *gen = (__pyx_CoroutineObject *) self;
+    PyObject *yf = gen->yieldfrom;
+
+    if (unlikely(gen->is_running))
+        return __Pyx_Coroutine_AlreadyRunningError(gen);
+
+    if (yf) {
+        PyObject *ret;
+        Py_INCREF(yf);
+        if (__Pyx_PyErr_GivenExceptionMatches(typ, PyExc_GeneratorExit) && close_on_genexit) {
+            // Asynchronous generators *should not* be closed right away.
+            // We have to allow some awaits to work it through, hence the
+            // `close_on_genexit` parameter here.
+            int err = __Pyx_Coroutine_CloseIter(gen, yf);
+            Py_DECREF(yf);
+            __Pyx_Coroutine_Undelegate(gen);
+            if (err < 0)
+                return __Pyx_Coroutine_MethodReturn(self, __Pyx_Coroutine_SendEx(gen, NULL, 0));
+            goto throw_here;
+        }
+        gen->is_running = 1;
+        if (0
+        #ifdef __Pyx_Generator_USED
+            || __Pyx_Generator_CheckExact(yf)
+        #endif
+        #ifdef __Pyx_Coroutine_USED
+            || __Pyx_Coroutine_Check(yf)
+        #endif
+            ) {
+            ret = __Pyx__Coroutine_Throw(yf, typ, val, tb, args, close_on_genexit);
+        #ifdef __Pyx_Coroutine_USED
+        } else if (__Pyx_CoroutineAwait_CheckExact(yf)) {
+            ret = __Pyx__Coroutine_Throw(((__pyx_CoroutineAwaitObject*)yf)->coroutine, typ, val, tb, args, close_on_genexit);
+        #endif
+        } else {
+            PyObject *meth = __Pyx_PyObject_GetAttrStrNoError(yf, PYIDENT("throw"));
+            if (unlikely(!meth)) {
+                Py_DECREF(yf);
+                if (unlikely(PyErr_Occurred())) {
+                    gen->is_running = 0;
+                    return NULL;
+                }
+                __Pyx_Coroutine_Undelegate(gen);
+                gen->is_running = 0;
+                goto throw_here;
+            }
+            if (likely(args)) {
+                ret = __Pyx_PyObject_Call(meth, args, NULL);
+            } else {
+                // "tb" or even "val" might be NULL, but that also correctly terminates the argument list
+                PyObject *cargs[4] = {NULL, typ, val, tb};
+                ret = __Pyx_PyObject_FastCall(meth, cargs+1, 3 | __Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET);
+            }
+            Py_DECREF(meth);
+        }
+        gen->is_running = 0;
+        Py_DECREF(yf);
+        if (!ret) {
+            ret = __Pyx_Coroutine_FinishDelegation(gen);
+        }
+        return __Pyx_Coroutine_MethodReturn(self, ret);
+    }
+throw_here:
+    __Pyx_Raise(typ, val, tb, NULL);
+    return __Pyx_Coroutine_MethodReturn(self, __Pyx_Coroutine_SendEx(gen, NULL, 0));
+}
+
+static PyObject *__Pyx_Coroutine_Throw(PyObject *self, PyObject *args) {
+    PyObject *typ;
+    PyObject *val = NULL;
+    PyObject *tb = NULL;
+
+    if (unlikely(!PyArg_UnpackTuple(args, (char *)"throw", 1, 3, &typ, &val, &tb)))
+        return NULL;
+
+    return __Pyx__Coroutine_Throw(self, typ, val, tb, args, 1);
+}
+
+static CYTHON_INLINE int __Pyx_Coroutine_traverse_excstate(__Pyx_ExcInfoStruct *exc_state, visitproc visit, void *arg) {
+#if PY_VERSION_HEX >= 0x030B00a4
+    Py_VISIT(exc_state->exc_value);
+#else
+    Py_VISIT(exc_state->exc_type);
+    Py_VISIT(exc_state->exc_value);
+    Py_VISIT(exc_state->exc_traceback);
+#endif
+    return 0;
+}
+
+static int __Pyx_Coroutine_traverse(__pyx_CoroutineObject *gen, visitproc visit, void *arg) {
+    Py_VISIT(gen->closure);
+    Py_VISIT(gen->classobj);
+    Py_VISIT(gen->yieldfrom);
+    return __Pyx_Coroutine_traverse_excstate(&gen->gi_exc_state, visit, arg);
+}
+
+static int __Pyx_Coroutine_clear(PyObject *self) {
+    __pyx_CoroutineObject *gen = (__pyx_CoroutineObject *) self;
+
+    Py_CLEAR(gen->closure);
+    Py_CLEAR(gen->classobj);
+    Py_CLEAR(gen->yieldfrom);
+    __Pyx_Coroutine_ExceptionClear(&gen->gi_exc_state);
+#ifdef __Pyx_AsyncGen_USED
+    if (__Pyx_AsyncGen_CheckExact(self)) {
+        Py_CLEAR(((__pyx_PyAsyncGenObject*)gen)->ag_finalizer);
+    }
+#endif
+    Py_CLEAR(gen->gi_code);
+    Py_CLEAR(gen->gi_frame);
+    Py_CLEAR(gen->gi_name);
+    Py_CLEAR(gen->gi_qualname);
+    Py_CLEAR(gen->gi_modulename);
+    return 0;
+}
+
+static void __Pyx_Coroutine_dealloc(PyObject *self) {
+    __pyx_CoroutineObject *gen = (__pyx_CoroutineObject *) self;
+
+    PyObject_GC_UnTrack(gen);
+    if (gen->gi_weakreflist != NULL)
+        PyObject_ClearWeakRefs(self);
+
+    if (gen->resume_label >= 0) {
+        // Generator is paused or unstarted, so we need to close
+        PyObject_GC_Track(self);
+#if PY_VERSION_HEX >= 0x030400a1 && CYTHON_USE_TP_FINALIZE
+        if (unlikely(PyObject_CallFinalizerFromDealloc(self)))
+#else
+        Py_TYPE(gen)->tp_del(self);
+        if (unlikely(Py_REFCNT(self) > 0))
+#endif
+        {
+            // resurrected.  :(
+            return;
+        }
+        PyObject_GC_UnTrack(self);
+    }
+
+#ifdef __Pyx_AsyncGen_USED
+    if (__Pyx_AsyncGen_CheckExact(self)) {
+        /* We have to handle this case for asynchronous generators
+           right here, because this code has to be between UNTRACK
+           and GC_Del. */
+        Py_CLEAR(((__pyx_PyAsyncGenObject*)self)->ag_finalizer);
+    }
+#endif
+    __Pyx_Coroutine_clear(self);
+    __Pyx_PyHeapTypeObject_GC_Del(gen);
+}
+
+static void __Pyx_Coroutine_del(PyObject *self) {
+    PyObject *error_type, *error_value, *error_traceback;
+    __pyx_CoroutineObject *gen = (__pyx_CoroutineObject *) self;
+    __Pyx_PyThreadState_declare
+
+    if (gen->resume_label < 0) {
+        // already terminated => nothing to clean up
+        return;
+    }
+
+#if !CYTHON_USE_TP_FINALIZE
+    // Temporarily resurrect the object.
+    assert(self->ob_refcnt == 0);
+    __Pyx_SET_REFCNT(self, 1);
+#endif
+
+    __Pyx_PyThreadState_assign
+
+    // Save the current exception, if any.
+    __Pyx_ErrFetch(&error_type, &error_value, &error_traceback);
+
+#ifdef __Pyx_AsyncGen_USED
+    if (__Pyx_AsyncGen_CheckExact(self)) {
+        __pyx_PyAsyncGenObject *agen = (__pyx_PyAsyncGenObject*)self;
+        PyObject *finalizer = agen->ag_finalizer;
+        if (finalizer && !agen->ag_closed) {
+            PyObject *res = __Pyx_PyObject_CallOneArg(finalizer, self);
+            if (unlikely(!res)) {
+                PyErr_WriteUnraisable(self);
+            } else {
+                Py_DECREF(res);
+            }
+            // Restore the saved exception.
+            __Pyx_ErrRestore(error_type, error_value, error_traceback);
+            return;
+        }
+    }
+#endif
+
+    if (unlikely(gen->resume_label == 0 && !error_value)) {
+#ifdef __Pyx_Coroutine_USED
+#ifdef __Pyx_Generator_USED
+    // only warn about (async) coroutines
+    if (!__Pyx_Generator_CheckExact(self))
+#endif
+        {
+        // untrack dead object as we are executing Python code (which might trigger GC)
+        PyObject_GC_UnTrack(self);
+#if PY_MAJOR_VERSION >= 3 /* PY_VERSION_HEX >= 0x03030000*/ || defined(PyErr_WarnFormat)
+        if (unlikely(PyErr_WarnFormat(PyExc_RuntimeWarning, 1, "coroutine '%.50S' was never awaited", gen->gi_qualname) < 0))
+            PyErr_WriteUnraisable(self);
+#else
+        {PyObject *msg;
+        char *cmsg;
+        #if CYTHON_COMPILING_IN_PYPY
+        msg = NULL;
+        cmsg = (char*) "coroutine was never awaited";
+        #else
+        char *cname;
+        PyObject *qualname;
+        qualname = gen->gi_qualname;
+        cname = PyString_AS_STRING(qualname);
+        msg = PyString_FromFormat("coroutine '%.50s' was never awaited", cname);
+
+        if (unlikely(!msg)) {
+            PyErr_Clear();
+            cmsg = (char*) "coroutine was never awaited";
+        } else {
+            cmsg = PyString_AS_STRING(msg);
+        }
+        #endif
+        if (unlikely(PyErr_WarnEx(PyExc_RuntimeWarning, cmsg, 1) < 0))
+            PyErr_WriteUnraisable(self);
+        Py_XDECREF(msg);}
+#endif
+        PyObject_GC_Track(self);
+        }
+#endif /*__Pyx_Coroutine_USED*/
+    } else {
+        PyObject *res = __Pyx_Coroutine_Close(self);
+        if (unlikely(!res)) {
+            if (PyErr_Occurred())
+                PyErr_WriteUnraisable(self);
+        } else {
+            Py_DECREF(res);
+        }
+    }
+
+    // Restore the saved exception.
+    __Pyx_ErrRestore(error_type, error_value, error_traceback);
+
+#if !CYTHON_USE_TP_FINALIZE
+    // Undo the temporary resurrection; can't use DECREF here, it would
+    // cause a recursive call.
+    assert(Py_REFCNT(self) > 0);
+    if (likely(--self->ob_refcnt == 0)) {
+        // this is the normal path out
+        return;
+    }
+
+    // close() resurrected it!  Make it look like the original Py_DECREF
+    // never happened.
+    {
+        Py_ssize_t refcnt = Py_REFCNT(self);
+        _Py_NewReference(self);
+        __Pyx_SET_REFCNT(self, refcnt);
+    }
+#if CYTHON_COMPILING_IN_CPYTHON
+    assert(PyType_IS_GC(Py_TYPE(self)) &&
+           _Py_AS_GC(self)->gc.gc_refs != _PyGC_REFS_UNTRACKED);
+
+    // If Py_REF_DEBUG, _Py_NewReference bumped _Py_RefTotal, so
+    // we need to undo that.
+    _Py_DEC_REFTOTAL;
+#endif
+    // If Py_TRACE_REFS, _Py_NewReference re-added self to the object
+    // chain, so no more to do there.
+    // If COUNT_ALLOCS, the original decref bumped tp_frees, and
+    // _Py_NewReference bumped tp_allocs:  both of those need to be
+    // undone.
+#ifdef COUNT_ALLOCS
+    --Py_TYPE(self)->tp_frees;
+    --Py_TYPE(self)->tp_allocs;
+#endif
+#endif
+}
+
+static PyObject *
+__Pyx_Coroutine_get_name(__pyx_CoroutineObject *self, void *context)
+{
+    PyObject *name = self->gi_name;
+    CYTHON_UNUSED_VAR(context);
+    // avoid NULL pointer dereference during garbage collection
+    if (unlikely(!name)) name = Py_None;
+    Py_INCREF(name);
+    return name;
+}
+
+static int
+__Pyx_Coroutine_set_name(__pyx_CoroutineObject *self, PyObject *value, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+#if PY_MAJOR_VERSION >= 3
+    if (unlikely(value == NULL || !PyUnicode_Check(value)))
+#else
+    if (unlikely(value == NULL || !PyString_Check(value)))
+#endif
+    {
+        PyErr_SetString(PyExc_TypeError,
+                        "__name__ must be set to a string object");
+        return -1;
+    }
+    Py_INCREF(value);
+    __Pyx_Py_XDECREF_SET(self->gi_name, value);
+    return 0;
+}
+
+static PyObject *
+__Pyx_Coroutine_get_qualname(__pyx_CoroutineObject *self, void *context)
+{
+    PyObject *name = self->gi_qualname;
+    CYTHON_UNUSED_VAR(context);
+    // avoid NULL pointer dereference during garbage collection
+    if (unlikely(!name)) name = Py_None;
+    Py_INCREF(name);
+    return name;
+}
+
+static int
+__Pyx_Coroutine_set_qualname(__pyx_CoroutineObject *self, PyObject *value, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+#if PY_MAJOR_VERSION >= 3
+    if (unlikely(value == NULL || !PyUnicode_Check(value)))
+#else
+    if (unlikely(value == NULL || !PyString_Check(value)))
+#endif
+    {
+        PyErr_SetString(PyExc_TypeError,
+                        "__qualname__ must be set to a string object");
+        return -1;
+    }
+    Py_INCREF(value);
+    __Pyx_Py_XDECREF_SET(self->gi_qualname, value);
+    return 0;
+}
+
+static PyObject *
+__Pyx_Coroutine_get_frame(__pyx_CoroutineObject *self, void *context)
+{
+    PyObject *frame = self->gi_frame;
+    CYTHON_UNUSED_VAR(context);
+    if (!frame) {
+        if (unlikely(!self->gi_code)) {
+            // Avoid doing something stupid, e.g. during garbage collection.
+            Py_RETURN_NONE;
+        }
+        frame = (PyObject *) PyFrame_New(
+            PyThreadState_Get(),            /*PyThreadState *tstate,*/
+            (PyCodeObject*) self->gi_code,  /*PyCodeObject *code,*/
+            $moddict_cname,                 /*PyObject *globals,*/
+            0                               /*PyObject *locals*/
+        );
+        if (unlikely(!frame))
+            return NULL;
+        // keep the frame cached once it's created
+        self->gi_frame = frame;
+    }
+    Py_INCREF(frame);
+    return frame;
+}
+
+static __pyx_CoroutineObject *__Pyx__Coroutine_New(
+            PyTypeObject* type, __pyx_coroutine_body_t body, PyObject *code, PyObject *closure,
+            PyObject *name, PyObject *qualname, PyObject *module_name) {
+    __pyx_CoroutineObject *gen = PyObject_GC_New(__pyx_CoroutineObject, type);
+    if (unlikely(!gen))
+        return NULL;
+    return __Pyx__Coroutine_NewInit(gen, body, code, closure, name, qualname, module_name);
+}
+
+static __pyx_CoroutineObject *__Pyx__Coroutine_NewInit(
+            __pyx_CoroutineObject *gen, __pyx_coroutine_body_t body, PyObject *code, PyObject *closure,
+            PyObject *name, PyObject *qualname, PyObject *module_name) {
+    gen->body = body;
+    gen->closure = closure;
+    Py_XINCREF(closure);
+    gen->is_running = 0;
+    gen->resume_label = 0;
+    gen->classobj = NULL;
+    gen->yieldfrom = NULL;
+    #if PY_VERSION_HEX >= 0x030B00a4
+    gen->gi_exc_state.exc_value = NULL;
+    #else
+    gen->gi_exc_state.exc_type = NULL;
+    gen->gi_exc_state.exc_value = NULL;
+    gen->gi_exc_state.exc_traceback = NULL;
+    #endif
+#if CYTHON_USE_EXC_INFO_STACK
+    gen->gi_exc_state.previous_item = NULL;
+#endif
+    gen->gi_weakreflist = NULL;
+    Py_XINCREF(qualname);
+    gen->gi_qualname = qualname;
+    Py_XINCREF(name);
+    gen->gi_name = name;
+    Py_XINCREF(module_name);
+    gen->gi_modulename = module_name;
+    Py_XINCREF(code);
+    gen->gi_code = code;
+    gen->gi_frame = NULL;
+
+    PyObject_GC_Track(gen);
+    return gen;
+}
+
+
+//////////////////// Coroutine ////////////////////
+//@requires: CoroutineBase
+//@requires: PatchGeneratorABC
+//@requires: ObjectHandling.c::PyObject_GenericGetAttrNoDict
+
+static void __Pyx_CoroutineAwait_dealloc(PyObject *self) {
+    PyObject_GC_UnTrack(self);
+    Py_CLEAR(((__pyx_CoroutineAwaitObject*)self)->coroutine);
+    __Pyx_PyHeapTypeObject_GC_Del(self);
+}
+
+static int __Pyx_CoroutineAwait_traverse(__pyx_CoroutineAwaitObject *self, visitproc visit, void *arg) {
+    Py_VISIT(self->coroutine);
+    return 0;
+}
+
+static int __Pyx_CoroutineAwait_clear(__pyx_CoroutineAwaitObject *self) {
+    Py_CLEAR(self->coroutine);
+    return 0;
+}
+
+static PyObject *__Pyx_CoroutineAwait_Next(__pyx_CoroutineAwaitObject *self) {
+    return __Pyx_Generator_Next(self->coroutine);
+}
+
+static PyObject *__Pyx_CoroutineAwait_Send(__pyx_CoroutineAwaitObject *self, PyObject *value) {
+    return __Pyx_Coroutine_Send(self->coroutine, value);
+}
+
+static PyObject *__Pyx_CoroutineAwait_Throw(__pyx_CoroutineAwaitObject *self, PyObject *args) {
+    return __Pyx_Coroutine_Throw(self->coroutine, args);
+}
+
+static PyObject *__Pyx_CoroutineAwait_Close(__pyx_CoroutineAwaitObject *self, PyObject *arg) {
+    CYTHON_UNUSED_VAR(arg);
+    return __Pyx_Coroutine_Close(self->coroutine);
+}
+
+static PyObject *__Pyx_CoroutineAwait_self(PyObject *self) {
+    Py_INCREF(self);
+    return self;
+}
+
+#if !CYTHON_COMPILING_IN_PYPY
+static PyObject *__Pyx_CoroutineAwait_no_new(PyTypeObject *type, PyObject *args, PyObject *kwargs) {
+    CYTHON_UNUSED_VAR(type);
+    CYTHON_UNUSED_VAR(args);
+    CYTHON_UNUSED_VAR(kwargs);
+    PyErr_SetString(PyExc_TypeError, "cannot instantiate type, use 'await coroutine' instead");
+    return NULL;
+}
+#endif
+
+// In earlier versions of Python an object with no __dict__ and not __slots__ is assumed
+// to be pickleable by default. Coroutine-wrappers have significant state so shouldn't be.
+// Therefore provide a default implementation.
+// Something similar applies to heaptypes (i.e. with type_specs) with protocols 0 and 1
+// even in more recent versions.
+// We are applying this to all Python versions (hence the commented out version guard)
+// to make the behaviour explicit.
+// #if PY_VERSION_HEX < 0x03060000 || CYTHON_USE_TYPE_SPECS
+static PyObject *__Pyx_CoroutineAwait_reduce_ex(__pyx_CoroutineAwaitObject *self, PyObject *arg) {
+    CYTHON_UNUSED_VAR(arg);
+    PyErr_Format(PyExc_TypeError, "cannot pickle '%.200s' object",
+                         Py_TYPE(self)->tp_name);
+    return NULL;
+}
+// #endif
+
+static PyMethodDef __pyx_CoroutineAwait_methods[] = {
+    {"send", (PyCFunction) __Pyx_CoroutineAwait_Send, METH_O,
+     (char*) PyDoc_STR("send(arg) -> send 'arg' into coroutine,\nreturn next yielded value or raise StopIteration.")},
+    {"throw", (PyCFunction) __Pyx_CoroutineAwait_Throw, METH_VARARGS,
+     (char*) PyDoc_STR("throw(typ[,val[,tb]]) -> raise exception in coroutine,\nreturn next yielded value or raise StopIteration.")},
+    {"close", (PyCFunction) __Pyx_CoroutineAwait_Close, METH_NOARGS,
+     (char*) PyDoc_STR("close() -> raise GeneratorExit inside coroutine.")},
+// only needed with type-specs or version<3.6, but included in all versions for clarity
+// #if PY_VERSION_HEX < 0x03060000 || CYTHON_USE_TYPE_SPECS
+    {"__reduce_ex__", (PyCFunction) __Pyx_CoroutineAwait_reduce_ex, METH_O, 0},
+    {"__reduce__", (PyCFunction) __Pyx_CoroutineAwait_reduce_ex, METH_NOARGS, 0},
+// #endif
+    {0, 0, 0, 0}
+};
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx_CoroutineAwaitType_slots[] = {
+    {Py_tp_dealloc, (void *)__Pyx_CoroutineAwait_dealloc},
+    {Py_tp_traverse, (void *)__Pyx_CoroutineAwait_traverse},
+    {Py_tp_clear, (void *)__Pyx_CoroutineAwait_clear},
+#if !CYTHON_COMPILING_IN_PYPY
+    {Py_tp_new, (void *)__Pyx_CoroutineAwait_no_new},
+#endif
+    {Py_tp_methods, (void *)__pyx_CoroutineAwait_methods},
+    {Py_tp_iter, (void *)__Pyx_CoroutineAwait_self},
+    {Py_tp_iternext, (void *)__Pyx_CoroutineAwait_Next},
+    {0, 0},
+};
+
+static PyType_Spec __pyx_CoroutineAwaitType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "coroutine_wrapper",
+    sizeof(__pyx_CoroutineAwaitObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+    __pyx_CoroutineAwaitType_slots
+};
+#else /* CYTHON_USE_TYPE_SPECS */
+
+static PyTypeObject __pyx_CoroutineAwaitType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    __PYX_TYPE_MODULE_PREFIX "coroutine_wrapper", /*tp_name*/
+    sizeof(__pyx_CoroutineAwaitObject), /*tp_basicsize*/
+    0,                                  /*tp_itemsize*/
+    (destructor) __Pyx_CoroutineAwait_dealloc,/*tp_dealloc*/
+    0,                                  /*tp_print*/
+    0,                                  /*tp_getattr*/
+    0,                                  /*tp_setattr*/
+    0,                                  /*tp_as_async resp. tp_compare*/
+    0,                                  /*tp_repr*/
+    0,                                  /*tp_as_number*/
+    0,                                  /*tp_as_sequence*/
+    0,                                  /*tp_as_mapping*/
+    0,                                  /*tp_hash*/
+    0,                                  /*tp_call*/
+    0,                                  /*tp_str*/
+    0,                                  /*tp_getattro*/
+    0,                                  /*tp_setattro*/
+    0,                                  /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+    PyDoc_STR("A wrapper object implementing __await__ for coroutines."), /*tp_doc*/
+    (traverseproc) __Pyx_CoroutineAwait_traverse,   /*tp_traverse*/
+    (inquiry) __Pyx_CoroutineAwait_clear,           /*tp_clear*/
+    0,                                  /*tp_richcompare*/
+    0,                                  /*tp_weaklistoffset*/
+    __Pyx_CoroutineAwait_self,          /*tp_iter*/
+    (iternextfunc) __Pyx_CoroutineAwait_Next, /*tp_iternext*/
+    __pyx_CoroutineAwait_methods,       /*tp_methods*/
+    0                         ,         /*tp_members*/
+    0                      ,            /*tp_getset*/
+    0,                                  /*tp_base*/
+    0,                                  /*tp_dict*/
+    0,                                  /*tp_descr_get*/
+    0,                                  /*tp_descr_set*/
+    0,                                  /*tp_dictoffset*/
+    0,                                  /*tp_init*/
+    0,                                  /*tp_alloc*/
+#if !CYTHON_COMPILING_IN_PYPY
+    __Pyx_CoroutineAwait_no_new,        /*tp_new*/
+#else
+    0,                                  /*tp_new*/
+#endif
+    0,                                  /*tp_free*/
+    0,                                  /*tp_is_gc*/
+    0,                                  /*tp_bases*/
+    0,                                  /*tp_mro*/
+    0,                                  /*tp_cache*/
+    0,                                  /*tp_subclasses*/
+    0,                                  /*tp_weaklist*/
+    0,                                  /*tp_del*/
+    0,                                  /*tp_version_tag*/
+#if PY_VERSION_HEX >= 0x030400a1
+    0,                                  /*tp_finalize*/
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                  /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                  /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                  /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif  /* CYTHON_USE_TYPE_SPECS */
+
+#if PY_VERSION_HEX < 0x030500B1 || defined(__Pyx_IterableCoroutine_USED) || CYTHON_USE_ASYNC_SLOTS
+static CYTHON_INLINE PyObject *__Pyx__Coroutine_await(PyObject *coroutine) {
+    __pyx_CoroutineAwaitObject *await = PyObject_GC_New(__pyx_CoroutineAwaitObject, __pyx_CoroutineAwaitType);
+    if (unlikely(!await)) return NULL;
+    Py_INCREF(coroutine);
+    await->coroutine = coroutine;
+    PyObject_GC_Track(await);
+    return (PyObject*)await;
+}
+#endif
+
+#if PY_VERSION_HEX < 0x030500B1
+static PyObject *__Pyx_Coroutine_await_method(PyObject *coroutine, PyObject *arg) {
+    CYTHON_UNUSED_VAR(arg);
+    return __Pyx__Coroutine_await(coroutine);
+}
+#endif
+
+#if defined(__Pyx_IterableCoroutine_USED) || CYTHON_USE_ASYNC_SLOTS
+static PyObject *__Pyx_Coroutine_await(PyObject *coroutine) {
+    if (unlikely(!coroutine || !__Pyx_Coroutine_Check(coroutine))) {
+        PyErr_SetString(PyExc_TypeError, "invalid input, expected coroutine");
+        return NULL;
+    }
+    return __Pyx__Coroutine_await(coroutine);
+}
+#endif
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3 && PY_VERSION_HEX < 0x030500B1
+static PyObject *__Pyx_Coroutine_compare(PyObject *obj, PyObject *other, int op) {
+    PyObject* result;
+    switch (op) {
+        case Py_EQ: result = (other == obj) ? Py_True : Py_False; break;
+        case Py_NE: result = (other != obj) ? Py_True : Py_False; break;
+        default:
+            result = Py_NotImplemented;
+    }
+    Py_INCREF(result);
+    return result;
+}
+#endif
+
+static PyMethodDef __pyx_Coroutine_methods[] = {
+    {"send", (PyCFunction) __Pyx_Coroutine_Send, METH_O,
+     (char*) PyDoc_STR("send(arg) -> send 'arg' into coroutine,\nreturn next iterated value or raise StopIteration.")},
+    {"throw", (PyCFunction) __Pyx_Coroutine_Throw, METH_VARARGS,
+     (char*) PyDoc_STR("throw(typ[,val[,tb]]) -> raise exception in coroutine,\nreturn next iterated value or raise StopIteration.")},
+    {"close", (PyCFunction) __Pyx_Coroutine_Close_Method, METH_NOARGS,
+     (char*) PyDoc_STR("close() -> raise GeneratorExit inside coroutine.")},
+#if PY_VERSION_HEX < 0x030500B1
+    {"__await__", (PyCFunction) __Pyx_Coroutine_await_method, METH_NOARGS,
+     (char*) PyDoc_STR("__await__() -> return an iterator to be used in await expression.")},
+#endif
+    {0, 0, 0, 0}
+};
+
+static PyMemberDef __pyx_Coroutine_memberlist[] = {
+    {(char *) "cr_running", T_BOOL, offsetof(__pyx_CoroutineObject, is_running), READONLY, NULL},
+    {(char*) "cr_await", T_OBJECT, offsetof(__pyx_CoroutineObject, yieldfrom), READONLY,
+     (char*) PyDoc_STR("object being awaited, or None")},
+    {(char*) "cr_code", T_OBJECT, offsetof(__pyx_CoroutineObject, gi_code), READONLY, NULL},
+    {(char *) "__module__", T_OBJECT, offsetof(__pyx_CoroutineObject, gi_modulename), 0, 0},
+#if CYTHON_USE_TYPE_SPECS
+    {(char *) "__weaklistoffset__", T_PYSSIZET, offsetof(__pyx_CoroutineObject, gi_weakreflist), READONLY, 0},
+#endif
+    {0, 0, 0, 0, 0}
+};
+
+static PyGetSetDef __pyx_Coroutine_getsets[] = {
+    {(char *) "__name__", (getter)__Pyx_Coroutine_get_name, (setter)__Pyx_Coroutine_set_name,
+     (char*) PyDoc_STR("name of the coroutine"), 0},
+    {(char *) "__qualname__", (getter)__Pyx_Coroutine_get_qualname, (setter)__Pyx_Coroutine_set_qualname,
+     (char*) PyDoc_STR("qualified name of the coroutine"), 0},
+    {(char *) "cr_frame", (getter)__Pyx_Coroutine_get_frame, NULL,
+     (char*) PyDoc_STR("Frame of the coroutine"), 0},
+    {0, 0, 0, 0, 0}
+};
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx_CoroutineType_slots[] = {
+    {Py_tp_dealloc, (void *)__Pyx_Coroutine_dealloc},
+    {Py_am_await, (void *)&__Pyx_Coroutine_await},
+    {Py_tp_traverse, (void *)__Pyx_Coroutine_traverse},
+    {Py_tp_methods, (void *)__pyx_Coroutine_methods},
+    {Py_tp_members, (void *)__pyx_Coroutine_memberlist},
+    {Py_tp_getset, (void *)__pyx_Coroutine_getsets},
+    {Py_tp_getattro, (void *) __Pyx_PyObject_GenericGetAttrNoDict},
+#if CYTHON_USE_TP_FINALIZE
+    {Py_tp_finalize, (void *)__Pyx_Coroutine_del},
+#endif
+    {0, 0},
+};
+
+static PyType_Spec __pyx_CoroutineType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "coroutine",
+    sizeof(__pyx_CoroutineObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
+    __pyx_CoroutineType_slots
+};
+#else /* CYTHON_USE_TYPE_SPECS */
+
+#if CYTHON_USE_ASYNC_SLOTS
+static __Pyx_PyAsyncMethodsStruct __pyx_Coroutine_as_async = {
+    __Pyx_Coroutine_await, /*am_await*/
+    0, /*am_aiter*/
+    0, /*am_anext*/
+#if PY_VERSION_HEX >= 0x030A00A3
+    0, /*am_send*/
+#endif
+};
+#endif
+
+static PyTypeObject __pyx_CoroutineType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    __PYX_TYPE_MODULE_PREFIX "coroutine", /*tp_name*/
+    sizeof(__pyx_CoroutineObject),      /*tp_basicsize*/
+    0,                                  /*tp_itemsize*/
+    (destructor) __Pyx_Coroutine_dealloc,/*tp_dealloc*/
+    0,                                  /*tp_print*/
+    0,                                  /*tp_getattr*/
+    0,                                  /*tp_setattr*/
+#if CYTHON_USE_ASYNC_SLOTS
+    &__pyx_Coroutine_as_async,          /*tp_as_async (tp_reserved) - Py3 only! */
+#else
+    0,                                  /*tp_reserved*/
+#endif
+    0,                                  /*tp_repr*/
+    0,                                  /*tp_as_number*/
+    0,                                  /*tp_as_sequence*/
+    0,                                  /*tp_as_mapping*/
+    0,                                  /*tp_hash*/
+    0,                                  /*tp_call*/
+    0,                                  /*tp_str*/
+    0,                                  /*tp_getattro*/
+    0,                                  /*tp_setattro*/
+    0,                                  /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
+    0,                                  /*tp_doc*/
+    (traverseproc) __Pyx_Coroutine_traverse,   /*tp_traverse*/
+    0,                                  /*tp_clear*/
+#if CYTHON_USE_ASYNC_SLOTS && CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3 && PY_VERSION_HEX < 0x030500B1
+    // in order to (mis-)use tp_reserved above, we must also implement tp_richcompare
+    __Pyx_Coroutine_compare,            /*tp_richcompare*/
+#else
+    0,                                  /*tp_richcompare*/
+#endif
+    offsetof(__pyx_CoroutineObject, gi_weakreflist), /*tp_weaklistoffset*/
+    // no tp_iter() as iterator is only available through __await__()
+    0,                                  /*tp_iter*/
+    0,                                  /*tp_iternext*/
+    __pyx_Coroutine_methods,            /*tp_methods*/
+    __pyx_Coroutine_memberlist,         /*tp_members*/
+    __pyx_Coroutine_getsets,            /*tp_getset*/
+    0,                                  /*tp_base*/
+    0,                                  /*tp_dict*/
+    0,                                  /*tp_descr_get*/
+    0,                                  /*tp_descr_set*/
+    0,                                  /*tp_dictoffset*/
+    0,                                  /*tp_init*/
+    0,                                  /*tp_alloc*/
+    0,                                  /*tp_new*/
+    0,                                  /*tp_free*/
+    0,                                  /*tp_is_gc*/
+    0,                                  /*tp_bases*/
+    0,                                  /*tp_mro*/
+    0,                                  /*tp_cache*/
+    0,                                  /*tp_subclasses*/
+    0,                                  /*tp_weaklist*/
+#if CYTHON_USE_TP_FINALIZE
+    0,                                  /*tp_del*/
+#else
+    __Pyx_Coroutine_del,                /*tp_del*/
+#endif
+    0,                                  /*tp_version_tag*/
+#if CYTHON_USE_TP_FINALIZE
+    __Pyx_Coroutine_del,                /*tp_finalize*/
+#elif PY_VERSION_HEX >= 0x030400a1
+    0,                                  /*tp_finalize*/
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                  /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                  /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                  /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif /* CYTHON_USE_TYPE_SPECS */
+
+static int __pyx_Coroutine_init(PyObject *module) {
+    CYTHON_MAYBE_UNUSED_VAR(module);
+    // on Windows, C-API functions can't be used in slots statically
+#if CYTHON_USE_TYPE_SPECS
+    __pyx_CoroutineType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx_CoroutineType_spec, NULL);
+#else
+    __pyx_CoroutineType_type.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
+    __pyx_CoroutineType = __Pyx_FetchCommonType(&__pyx_CoroutineType_type);
+#endif
+    if (unlikely(!__pyx_CoroutineType))
+        return -1;
+
+#ifdef __Pyx_IterableCoroutine_USED
+    if (unlikely(__pyx_IterableCoroutine_init(module) == -1))
+        return -1;
+#endif
+
+#if CYTHON_USE_TYPE_SPECS
+    __pyx_CoroutineAwaitType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx_CoroutineAwaitType_spec, NULL);
+#else
+    __pyx_CoroutineAwaitType = __Pyx_FetchCommonType(&__pyx_CoroutineAwaitType_type);
+#endif
+    if (unlikely(!__pyx_CoroutineAwaitType))
+        return -1;
+    return 0;
+}
+
+
+//////////////////// IterableCoroutine.proto ////////////////////
+
+#define __Pyx_IterableCoroutine_USED
+
+#undef __Pyx_Coroutine_Check
+#define __Pyx_Coroutine_Check(obj) (__Pyx_Coroutine_CheckExact(obj) || __Pyx_IS_TYPE(obj, __pyx_IterableCoroutineType))
+
+#define __Pyx_IterableCoroutine_New(body, code, closure, name, qualname, module_name)  \
+    __Pyx__Coroutine_New(__pyx_IterableCoroutineType, body, code, closure, name, qualname, module_name)
+
+static int __pyx_IterableCoroutine_init(PyObject *module);/*proto*/
+
+
+//////////////////// IterableCoroutine ////////////////////
+//@requires: Coroutine
+//@requires: CommonStructures.c::FetchCommonType
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx_IterableCoroutineType_slots[] = {
+    {Py_tp_dealloc, (void *)__Pyx_Coroutine_dealloc},
+    {Py_am_await, (void *)&__Pyx_Coroutine_await},
+    {Py_tp_traverse, (void *)__Pyx_Coroutine_traverse},
+    {Py_tp_iter, (void *)__Pyx_Coroutine_await},
+    {Py_tp_iternext, (void *)__Pyx_Generator_Next},
+    {Py_tp_methods, (void *)__pyx_Coroutine_methods},
+    {Py_tp_members, (void *)__pyx_Coroutine_memberlist},
+    {Py_tp_getset, (void *)__pyx_Coroutine_getsets},
+    {Py_tp_getattro, (void *) __Pyx_PyObject_GenericGetAttrNoDict},
+#if CYTHON_USE_TP_FINALIZE
+    {Py_tp_finalize, (void *)__Pyx_Coroutine_del},
+#endif
+    {0, 0},
+};
+
+static PyType_Spec __pyx_IterableCoroutineType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "iterable_coroutine",
+    sizeof(__pyx_CoroutineObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
+    __pyx_IterableCoroutineType_slots
+};
+#else /* CYTHON_USE_TYPE_SPECS */
+
+static PyTypeObject __pyx_IterableCoroutineType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    __PYX_TYPE_MODULE_PREFIX "iterable_coroutine", /*tp_name*/
+    sizeof(__pyx_CoroutineObject),      /*tp_basicsize*/
+    0,                                  /*tp_itemsize*/
+    (destructor) __Pyx_Coroutine_dealloc,/*tp_dealloc*/
+    0,                                  /*tp_print*/
+    0,                                  /*tp_getattr*/
+    0,                                  /*tp_setattr*/
+#if CYTHON_USE_ASYNC_SLOTS
+    &__pyx_Coroutine_as_async,          /*tp_as_async (tp_reserved) - Py3 only! */
+#else
+    0,                                  /*tp_reserved*/
+#endif
+    0,                                  /*tp_repr*/
+    0,                                  /*tp_as_number*/
+    0,                                  /*tp_as_sequence*/
+    0,                                  /*tp_as_mapping*/
+    0,                                  /*tp_hash*/
+    0,                                  /*tp_call*/
+    0,                                  /*tp_str*/
+    0,                                  /*tp_getattro*/
+    0,                                  /*tp_setattro*/
+    0,                                  /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
+    0,                                  /*tp_doc*/
+    (traverseproc) __Pyx_Coroutine_traverse,   /*tp_traverse*/
+    0,                                  /*tp_clear*/
+#if CYTHON_USE_ASYNC_SLOTS && CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3 && PY_VERSION_HEX < 0x030500B1
+    // in order to (mis-)use tp_reserved above, we must also implement tp_richcompare
+    __Pyx_Coroutine_compare,            /*tp_richcompare*/
+#else
+    0,                                  /*tp_richcompare*/
+#endif
+    offsetof(__pyx_CoroutineObject, gi_weakreflist), /*tp_weaklistoffset*/
+    // enable iteration for legacy support of asyncio yield-from protocol
+    __Pyx_Coroutine_await,              /*tp_iter*/
+    (iternextfunc) __Pyx_Generator_Next, /*tp_iternext*/
+    __pyx_Coroutine_methods,            /*tp_methods*/
+    __pyx_Coroutine_memberlist,         /*tp_members*/
+    __pyx_Coroutine_getsets,            /*tp_getset*/
+    0,                                  /*tp_base*/
+    0,                                  /*tp_dict*/
+    0,                                  /*tp_descr_get*/
+    0,                                  /*tp_descr_set*/
+    0,                                  /*tp_dictoffset*/
+    0,                                  /*tp_init*/
+    0,                                  /*tp_alloc*/
+    0,                                  /*tp_new*/
+    0,                                  /*tp_free*/
+    0,                                  /*tp_is_gc*/
+    0,                                  /*tp_bases*/
+    0,                                  /*tp_mro*/
+    0,                                  /*tp_cache*/
+    0,                                  /*tp_subclasses*/
+    0,                                  /*tp_weaklist*/
+#if PY_VERSION_HEX >= 0x030400a1
+    0,                                  /*tp_del*/
+#else
+    __Pyx_Coroutine_del,                /*tp_del*/
+#endif
+    0,                                  /*tp_version_tag*/
+#if PY_VERSION_HEX >= 0x030400a1 && !CYTHON_COMPILING_IN_PYPY
+    __Pyx_Coroutine_del,                /*tp_finalize*/
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                  /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                  /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                  /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif /* CYTHON_USE_TYPE_SPECS */
+
+
+static int __pyx_IterableCoroutine_init(PyObject *module) {
+#if CYTHON_USE_TYPE_SPECS
+    __pyx_IterableCoroutineType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx_IterableCoroutineType_spec, NULL);
+#else
+    CYTHON_UNUSED_VAR(module);
+    __pyx_IterableCoroutineType_type.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
+    __pyx_IterableCoroutineType = __Pyx_FetchCommonType(&__pyx_IterableCoroutineType_type);
+#endif
+    if (unlikely(!__pyx_IterableCoroutineType))
+        return -1;
+    return 0;
+}
+
+
+//////////////////// Generator ////////////////////
+//@requires: CoroutineBase
+//@requires: PatchGeneratorABC
+//@requires: ObjectHandling.c::PyObject_GenericGetAttrNoDict
+
+static PyMethodDef __pyx_Generator_methods[] = {
+    {"send", (PyCFunction) __Pyx_Coroutine_Send, METH_O,
+     (char*) PyDoc_STR("send(arg) -> send 'arg' into generator,\nreturn next yielded value or raise StopIteration.")},
+    {"throw", (PyCFunction) __Pyx_Coroutine_Throw, METH_VARARGS,
+     (char*) PyDoc_STR("throw(typ[,val[,tb]]) -> raise exception in generator,\nreturn next yielded value or raise StopIteration.")},
+    {"close", (PyCFunction) __Pyx_Coroutine_Close_Method, METH_NOARGS,
+     (char*) PyDoc_STR("close() -> raise GeneratorExit inside generator.")},
+    {0, 0, 0, 0}
+};
+
+static PyMemberDef __pyx_Generator_memberlist[] = {
+    {(char *) "gi_running", T_BOOL, offsetof(__pyx_CoroutineObject, is_running), READONLY, NULL},
+    {(char*) "gi_yieldfrom", T_OBJECT, offsetof(__pyx_CoroutineObject, yieldfrom), READONLY,
+     (char*) PyDoc_STR("object being iterated by 'yield from', or None")},
+    {(char*) "gi_code", T_OBJECT, offsetof(__pyx_CoroutineObject, gi_code), READONLY, NULL},
+    {(char *) "__module__", T_OBJECT, offsetof(__pyx_CoroutineObject, gi_modulename), 0, 0},
+#if CYTHON_USE_TYPE_SPECS
+    {(char *) "__weaklistoffset__", T_PYSSIZET, offsetof(__pyx_CoroutineObject, gi_weakreflist), READONLY, 0},
+#endif
+    {0, 0, 0, 0, 0}
+};
+
+static PyGetSetDef __pyx_Generator_getsets[] = {
+    {(char *) "__name__", (getter)__Pyx_Coroutine_get_name, (setter)__Pyx_Coroutine_set_name,
+     (char*) PyDoc_STR("name of the generator"), 0},
+    {(char *) "__qualname__", (getter)__Pyx_Coroutine_get_qualname, (setter)__Pyx_Coroutine_set_qualname,
+     (char*) PyDoc_STR("qualified name of the generator"), 0},
+    {(char *) "gi_frame", (getter)__Pyx_Coroutine_get_frame, NULL,
+     (char*) PyDoc_STR("Frame of the generator"), 0},
+    {0, 0, 0, 0, 0}
+};
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx_GeneratorType_slots[] = {
+    {Py_tp_dealloc, (void *)__Pyx_Coroutine_dealloc},
+    {Py_tp_traverse, (void *)__Pyx_Coroutine_traverse},
+    {Py_tp_iter, (void *)PyObject_SelfIter},
+    {Py_tp_iternext, (void *)__Pyx_Generator_Next},
+    {Py_tp_methods, (void *)__pyx_Generator_methods},
+    {Py_tp_members, (void *)__pyx_Generator_memberlist},
+    {Py_tp_getset, (void *)__pyx_Generator_getsets},
+    {Py_tp_getattro, (void *) __Pyx_PyObject_GenericGetAttrNoDict},
+#if CYTHON_USE_TP_FINALIZE
+    {Py_tp_finalize, (void *)__Pyx_Coroutine_del},
+#endif
+    {0, 0},
+};
+
+static PyType_Spec __pyx_GeneratorType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "generator",
+    sizeof(__pyx_CoroutineObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
+    __pyx_GeneratorType_slots
+};
+#else /* CYTHON_USE_TYPE_SPECS */
+
+static PyTypeObject __pyx_GeneratorType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    __PYX_TYPE_MODULE_PREFIX "generator", /*tp_name*/
+    sizeof(__pyx_CoroutineObject),      /*tp_basicsize*/
+    0,                                  /*tp_itemsize*/
+    (destructor) __Pyx_Coroutine_dealloc,/*tp_dealloc*/
+    0,                                  /*tp_print*/
+    0,                                  /*tp_getattr*/
+    0,                                  /*tp_setattr*/
+    0,                                  /*tp_as_async*/
+    0,                                  /*tp_repr*/
+    0,                                  /*tp_as_number*/
+    0,                                  /*tp_as_sequence*/
+    0,                                  /*tp_as_mapping*/
+    0,                                  /*tp_hash*/
+    0,                                  /*tp_call*/
+    0,                                  /*tp_str*/
+    0,                                  /*tp_getattro*/
+    0,                                  /*tp_setattro*/
+    0,                                  /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_FINALIZE, /*tp_flags*/
+    0,                                  /*tp_doc*/
+    (traverseproc) __Pyx_Coroutine_traverse,   /*tp_traverse*/
+    0,                                  /*tp_clear*/
+    0,                                  /*tp_richcompare*/
+    offsetof(__pyx_CoroutineObject, gi_weakreflist), /*tp_weaklistoffset*/
+    0,                                  /*tp_iter*/
+    (iternextfunc) __Pyx_Generator_Next, /*tp_iternext*/
+    __pyx_Generator_methods,            /*tp_methods*/
+    __pyx_Generator_memberlist,         /*tp_members*/
+    __pyx_Generator_getsets,            /*tp_getset*/
+    0,                                  /*tp_base*/
+    0,                                  /*tp_dict*/
+    0,                                  /*tp_descr_get*/
+    0,                                  /*tp_descr_set*/
+    0,                                  /*tp_dictoffset*/
+    0,                                  /*tp_init*/
+    0,                                  /*tp_alloc*/
+    0,                                  /*tp_new*/
+    0,                                  /*tp_free*/
+    0,                                  /*tp_is_gc*/
+    0,                                  /*tp_bases*/
+    0,                                  /*tp_mro*/
+    0,                                  /*tp_cache*/
+    0,                                  /*tp_subclasses*/
+    0,                                  /*tp_weaklist*/
+#if CYTHON_USE_TP_FINALIZE
+    0,                                  /*tp_del*/
+#else
+    __Pyx_Coroutine_del,                /*tp_del*/
+#endif
+    0,                                  /*tp_version_tag*/
+#if CYTHON_USE_TP_FINALIZE
+    __Pyx_Coroutine_del,                /*tp_finalize*/
+#elif PY_VERSION_HEX >= 0x030400a1
+    0,                                  /*tp_finalize*/
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                  /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                  /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                  /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif /* CYTHON_USE_TYPE_SPECS */
+
+static int __pyx_Generator_init(PyObject *module) {
+#if CYTHON_USE_TYPE_SPECS
+    __pyx_GeneratorType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx_GeneratorType_spec, NULL);
+#else
+    CYTHON_UNUSED_VAR(module);
+    // on Windows, C-API functions can't be used in slots statically
+    __pyx_GeneratorType_type.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
+    __pyx_GeneratorType_type.tp_iter = PyObject_SelfIter;
+    __pyx_GeneratorType = __Pyx_FetchCommonType(&__pyx_GeneratorType_type);
+#endif
+    if (unlikely(!__pyx_GeneratorType)) {
+        return -1;
+    }
+    return 0;
+}
+
+
+/////////////// ReturnWithStopIteration.proto ///////////////
+
+#define __Pyx_ReturnWithStopIteration(value)  \
+    if (value == Py_None) PyErr_SetNone(PyExc_StopIteration); else __Pyx__ReturnWithStopIteration(value)
+static void __Pyx__ReturnWithStopIteration(PyObject* value); /*proto*/
+
+/////////////// ReturnWithStopIteration ///////////////
+//@requires: Exceptions.c::PyErrFetchRestore
+//@requires: Exceptions.c::PyThreadStateGet
+//@substitute: naming
+
+// 1) Instantiating an exception just to pass back a value is costly.
+// 2) CPython 3.12 cannot separate exception type and value
+// 3) Passing a tuple as value into PyErr_SetObject() passes its items on as arguments.
+// 4) Passing an exception as value will interpret it as an exception on unpacking and raise it (or unpack its value).
+// 5) If there is currently an exception being handled, we need to chain it.
+
+static void __Pyx__ReturnWithStopIteration(PyObject* value) {
+    PyObject *exc, *args;
+#if CYTHON_COMPILING_IN_CPYTHON
+    __Pyx_PyThreadState_declare
+    if (PY_VERSION_HEX >= 0x030C00A6
+            || unlikely(PyTuple_Check(value) || PyExceptionInstance_Check(value))) {
+        args = PyTuple_New(1);
+        if (unlikely(!args)) return;
+        Py_INCREF(value);
+        PyTuple_SET_ITEM(args, 0, value);
+        exc = PyType_Type.tp_call(PyExc_StopIteration, args, NULL);
+        Py_DECREF(args);
+        if (!exc) return;
+    } else {
+        // it's safe to avoid instantiating the exception
+        Py_INCREF(value);
+        exc = value;
+    }
+    #if CYTHON_FAST_THREAD_STATE
+    __Pyx_PyThreadState_assign
+    #if CYTHON_USE_EXC_INFO_STACK
+    if (!$local_tstate_cname->exc_info->exc_value)
+    #else
+    if (!$local_tstate_cname->exc_type)
+    #endif
+    {
+        // no chaining needed => avoid the overhead in PyErr_SetObject()
+        Py_INCREF(PyExc_StopIteration);
+        __Pyx_ErrRestore(PyExc_StopIteration, exc, NULL);
+        return;
+    }
+    #endif
+#else
+    args = PyTuple_Pack(1, value);
+    if (unlikely(!args)) return;
+    exc = PyObject_Call(PyExc_StopIteration, args, NULL);
+    Py_DECREF(args);
+    if (unlikely(!exc)) return;
+#endif
+    PyErr_SetObject(PyExc_StopIteration, exc);
+    Py_DECREF(exc);
+}
+
+
+//////////////////// PatchModuleWithCoroutine.proto ////////////////////
+
+static PyObject* __Pyx_Coroutine_patch_module(PyObject* module, const char* py_code); /*proto*/
+
+//////////////////// PatchModuleWithCoroutine ////////////////////
+//@substitute: naming
+
+static PyObject* __Pyx_Coroutine_patch_module(PyObject* module, const char* py_code) {
+#if defined(__Pyx_Generator_USED) || defined(__Pyx_Coroutine_USED)
+    int result;
+    PyObject *globals, *result_obj;
+    globals = PyDict_New();  if (unlikely(!globals)) goto ignore;
+    result = PyDict_SetItemString(globals, "_cython_coroutine_type",
+    #ifdef __Pyx_Coroutine_USED
+        (PyObject*)__pyx_CoroutineType);
+    #else
+        Py_None);
+    #endif
+    if (unlikely(result < 0)) goto ignore;
+    result = PyDict_SetItemString(globals, "_cython_generator_type",
+    #ifdef __Pyx_Generator_USED
+        (PyObject*)__pyx_GeneratorType);
+    #else
+        Py_None);
+    #endif
+    if (unlikely(result < 0)) goto ignore;
+    if (unlikely(PyDict_SetItemString(globals, "_module", module) < 0)) goto ignore;
+    if (unlikely(PyDict_SetItemString(globals, "__builtins__", $builtins_cname) < 0)) goto ignore;
+    result_obj = PyRun_String(py_code, Py_file_input, globals, globals);
+    if (unlikely(!result_obj)) goto ignore;
+    Py_DECREF(result_obj);
+    Py_DECREF(globals);
+    return module;
+
+ignore:
+    Py_XDECREF(globals);
+    PyErr_WriteUnraisable(module);
+    if (unlikely(PyErr_WarnEx(PyExc_RuntimeWarning, "Cython module failed to patch module with custom type", 1) < 0)) {
+        Py_DECREF(module);
+        module = NULL;
+    }
+#else
+    // avoid "unused" warning
+    py_code++;
+#endif
+    return module;
+}
+
+
+//////////////////// PatchGeneratorABC.proto ////////////////////
+
+// register with Generator/Coroutine ABCs in 'collections.abc'
+// see https://bugs.python.org/issue24018
+static int __Pyx_patch_abc(void); /*proto*/
+
+//////////////////// PatchGeneratorABC ////////////////////
+//@requires: PatchModuleWithCoroutine
+
+#ifndef CYTHON_REGISTER_ABCS
+#define CYTHON_REGISTER_ABCS 1
+#endif
+
+#if defined(__Pyx_Generator_USED) || defined(__Pyx_Coroutine_USED)
+static PyObject* __Pyx_patch_abc_module(PyObject *module); /*proto*/
+static PyObject* __Pyx_patch_abc_module(PyObject *module) {
+    module = __Pyx_Coroutine_patch_module(
+        module, CSTRING("""\
+if _cython_generator_type is not None:
+    try: Generator = _module.Generator
+    except AttributeError: pass
+    else: Generator.register(_cython_generator_type)
+if _cython_coroutine_type is not None:
+    try: Coroutine = _module.Coroutine
+    except AttributeError: pass
+    else: Coroutine.register(_cython_coroutine_type)
+""")
+    );
+    return module;
+}
+#endif
+
+static int __Pyx_patch_abc(void) {
+#if defined(__Pyx_Generator_USED) || defined(__Pyx_Coroutine_USED)
+    static int abc_patched = 0;
+    if (CYTHON_REGISTER_ABCS && !abc_patched) {
+        PyObject *module;
+        module = PyImport_ImportModule((PY_MAJOR_VERSION >= 3) ? "collections.abc" : "collections");
+        if (unlikely(!module)) {
+            PyErr_WriteUnraisable(NULL);
+            if (unlikely(PyErr_WarnEx(PyExc_RuntimeWarning,
+                    ((PY_MAJOR_VERSION >= 3) ?
+                        "Cython module failed to register with collections.abc module" :
+                        "Cython module failed to register with collections module"), 1) < 0)) {
+                return -1;
+            }
+        } else {
+            module = __Pyx_patch_abc_module(module);
+            abc_patched = 1;
+            if (unlikely(!module))
+                return -1;
+            Py_DECREF(module);
+        }
+        // also register with "backports_abc" module if available, just in case
+        module = PyImport_ImportModule("backports_abc");
+        if (module) {
+            module = __Pyx_patch_abc_module(module);
+            Py_XDECREF(module);
+        }
+        if (!module) {
+            PyErr_Clear();
+        }
+    }
+#else
+    // avoid "unused" warning for __Pyx_Coroutine_patch_module()
+    if ((0)) __Pyx_Coroutine_patch_module(NULL, NULL);
+#endif
+    return 0;
+}
+
+
+//////////////////// PatchAsyncIO.proto ////////////////////
+
+// run after importing "asyncio" to patch Cython generator support into it
+static PyObject* __Pyx_patch_asyncio(PyObject* module); /*proto*/
+
+//////////////////// PatchAsyncIO ////////////////////
+//@requires: ImportExport.c::Import
+//@requires: PatchModuleWithCoroutine
+//@requires: PatchInspect
+
+static PyObject* __Pyx_patch_asyncio(PyObject* module) {
+#if PY_VERSION_HEX < 0x030500B2 && \
+        (defined(__Pyx_Coroutine_USED) || defined(__Pyx_Generator_USED)) && \
+        (!defined(CYTHON_PATCH_ASYNCIO) || CYTHON_PATCH_ASYNCIO)
+    PyObject *patch_module = NULL;
+    static int asyncio_patched = 0;
+    if (unlikely((!asyncio_patched) && module)) {
+        PyObject *package;
+        package = __Pyx_Import(PYIDENT("asyncio.coroutines"), NULL, 0);
+        if (package) {
+            patch_module = __Pyx_Coroutine_patch_module(
+                PyObject_GetAttrString(package, "coroutines"), CSTRING("""\
+try:
+    coro_types = _module._COROUTINE_TYPES
+except AttributeError: pass
+else:
+    if _cython_coroutine_type is not None and _cython_coroutine_type not in coro_types:
+        coro_types = tuple(coro_types) + (_cython_coroutine_type,)
+    if _cython_generator_type is not None and _cython_generator_type not in coro_types:
+        coro_types = tuple(coro_types) + (_cython_generator_type,)
+_module._COROUTINE_TYPES = coro_types
+""")
+            );
+        } else {
+            PyErr_Clear();
+// Always enable fallback: even if we compile against 3.4.2, we might be running on 3.4.1 at some point.
+//#if PY_VERSION_HEX < 0x03040200
+            // Py3.4.1 used to have asyncio.tasks instead of asyncio.coroutines
+            package = __Pyx_Import(PYIDENT("asyncio.tasks"), NULL, 0);
+            if (unlikely(!package)) goto asyncio_done;
+            patch_module = __Pyx_Coroutine_patch_module(
+                PyObject_GetAttrString(package, "tasks"), CSTRING("""\
+if hasattr(_module, 'iscoroutine'):
+    old_types = getattr(_module.iscoroutine, '_cython_coroutine_types', None)
+    if old_types is None or not isinstance(old_types, set):
+        old_types = set()
+        def cy_wrap(orig_func, type=type, cython_coroutine_types=old_types):
+            def cy_iscoroutine(obj): return type(obj) in cython_coroutine_types or orig_func(obj)
+            cy_iscoroutine._cython_coroutine_types = cython_coroutine_types
+            return cy_iscoroutine
+        _module.iscoroutine = cy_wrap(_module.iscoroutine)
+    if _cython_coroutine_type is not None:
+        old_types.add(_cython_coroutine_type)
+    if _cython_generator_type is not None:
+        old_types.add(_cython_generator_type)
+""")
+            );
+//#endif
+// Py < 0x03040200
+        }
+        Py_DECREF(package);
+        if (unlikely(!patch_module)) goto ignore;
+//#if PY_VERSION_HEX < 0x03040200
+asyncio_done:
+        PyErr_Clear();
+//#endif
+        asyncio_patched = 1;
+#ifdef __Pyx_Generator_USED
+        // now patch inspect.isgenerator() by looking up the imported module in the patched asyncio module
+        {
+            PyObject *inspect_module;
+            if (patch_module) {
+                inspect_module = PyObject_GetAttr(patch_module, PYIDENT("inspect"));
+                Py_DECREF(patch_module);
+            } else {
+                inspect_module = __Pyx_Import(PYIDENT("inspect"), NULL, 0);
+            }
+            if (unlikely(!inspect_module)) goto ignore;
+            inspect_module = __Pyx_patch_inspect(inspect_module);
+            if (unlikely(!inspect_module)) {
+                Py_DECREF(module);
+                module = NULL;
+            }
+            Py_XDECREF(inspect_module);
+        }
+#else
+        // avoid "unused" warning for __Pyx_patch_inspect()
+        if ((0)) return __Pyx_patch_inspect(module);
+#endif
+    }
+    return module;
+ignore:
+    PyErr_WriteUnraisable(module);
+    if (unlikely(PyErr_WarnEx(PyExc_RuntimeWarning, "Cython module failed to patch asyncio package with custom generator type", 1) < 0)) {
+        Py_DECREF(module);
+        module = NULL;
+    }
+#else
+    // avoid "unused" warning for __Pyx_Coroutine_patch_module()
+    if ((0)) return __Pyx_patch_inspect(__Pyx_Coroutine_patch_module(module, NULL));
+#endif
+    return module;
+}
+
+
+//////////////////// PatchInspect.proto ////////////////////
+
+// run after importing "inspect" to patch Cython generator support into it
+static PyObject* __Pyx_patch_inspect(PyObject* module); /*proto*/
+
+//////////////////// PatchInspect ////////////////////
+//@requires: PatchModuleWithCoroutine
+
+static PyObject* __Pyx_patch_inspect(PyObject* module) {
+#if defined(__Pyx_Generator_USED) && (!defined(CYTHON_PATCH_INSPECT) || CYTHON_PATCH_INSPECT)
+    static int inspect_patched = 0;
+    if (unlikely((!inspect_patched) && module)) {
+        module = __Pyx_Coroutine_patch_module(
+            module, CSTRING("""\
+old_types = getattr(_module.isgenerator, '_cython_generator_types', None)
+if old_types is None or not isinstance(old_types, set):
+    old_types = set()
+    def cy_wrap(orig_func, type=type, cython_generator_types=old_types):
+        def cy_isgenerator(obj): return type(obj) in cython_generator_types or orig_func(obj)
+        cy_isgenerator._cython_generator_types = cython_generator_types
+        return cy_isgenerator
+    _module.isgenerator = cy_wrap(_module.isgenerator)
+old_types.add(_cython_generator_type)
+""")
+        );
+        inspect_patched = 1;
+    }
+#else
+    // avoid "unused" warning for __Pyx_Coroutine_patch_module()
+    if ((0)) return __Pyx_Coroutine_patch_module(module, NULL);
+#endif
+    return module;
+}
+
+
+//////////////////// StopAsyncIteration.proto ////////////////////
+
+#define __Pyx_StopAsyncIteration_USED
+static PyObject *__Pyx_PyExc_StopAsyncIteration;
+static int __pyx_StopAsyncIteration_init(PyObject *module); /*proto*/
+
+//////////////////// StopAsyncIteration ////////////////////
+
+#if PY_VERSION_HEX < 0x030500B1
+#if CYTHON_USE_TYPE_SPECS
+#error Using async coroutines with type specs requires Python 3.5 or later.
+#else
+
+static PyTypeObject __Pyx__PyExc_StopAsyncIteration_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    "StopAsyncIteration",               /*tp_name*/
+    sizeof(PyBaseExceptionObject),      /*tp_basicsize*/
+    0,                                  /*tp_itemsize*/
+    0,                                  /*tp_dealloc*/
+    0,                                  /*tp_print*/
+    0,                                  /*tp_getattr*/
+    0,                                  /*tp_setattr*/
+    0,                                  /*tp_compare / reserved*/
+    0,                                  /*tp_repr*/
+    0,                                  /*tp_as_number*/
+    0,                                  /*tp_as_sequence*/
+    0,                                  /*tp_as_mapping*/
+    0,                                  /*tp_hash*/
+    0,                                  /*tp_call*/
+    0,                                  /*tp_str*/
+    0,                                  /*tp_getattro*/
+    0,                                  /*tp_setattro*/
+    0,                                  /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,  /*tp_flags*/
+    PyDoc_STR("Signal the end from iterator.__anext__()."),  /*tp_doc*/
+    0,                                  /*tp_traverse*/
+    0,                                  /*tp_clear*/
+    0,                                  /*tp_richcompare*/
+    0,                                  /*tp_weaklistoffset*/
+    0,                                  /*tp_iter*/
+    0,                                  /*tp_iternext*/
+    0,                                  /*tp_methods*/
+    0,                                  /*tp_members*/
+    0,                                  /*tp_getset*/
+    0,                                  /*tp_base*/
+    0,                                  /*tp_dict*/
+    0,                                  /*tp_descr_get*/
+    0,                                  /*tp_descr_set*/
+    0,                                  /*tp_dictoffset*/
+    0,                                  /*tp_init*/
+    0,                                  /*tp_alloc*/
+    0,                                  /*tp_new*/
+    0,                                  /*tp_free*/
+    0,                                  /*tp_is_gc*/
+    0,                                  /*tp_bases*/
+    0,                                  /*tp_mro*/
+    0,                                  /*tp_cache*/
+    0,                                  /*tp_subclasses*/
+    0,                                  /*tp_weaklist*/
+    0,                                  /*tp_del*/
+    0,                                  /*tp_version_tag*/
+#if PY_VERSION_HEX >= 0x030400a1
+    0,                                  /*tp_finalize*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PYPY_VERSION_NUM+0 >= 0x06000000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif
+#endif
+
+static int __pyx_StopAsyncIteration_init(PyObject *module) {
+    CYTHON_UNUSED_VAR(module);
+#if PY_VERSION_HEX >= 0x030500B1
+    __Pyx_PyExc_StopAsyncIteration = PyExc_StopAsyncIteration;
+#else
+    PyObject *builtins = PyEval_GetBuiltins();
+    if (likely(builtins)) {
+        PyObject *exc = PyMapping_GetItemString(builtins, (char*) "StopAsyncIteration");
+        if (exc) {
+            __Pyx_PyExc_StopAsyncIteration = exc;
+            return 0;
+        }
+    }
+    PyErr_Clear();
+
+    __Pyx__PyExc_StopAsyncIteration_type.tp_traverse = ((PyTypeObject*)PyExc_BaseException)->tp_traverse;
+    __Pyx__PyExc_StopAsyncIteration_type.tp_clear = ((PyTypeObject*)PyExc_BaseException)->tp_clear;
+    __Pyx__PyExc_StopAsyncIteration_type.tp_dictoffset = ((PyTypeObject*)PyExc_BaseException)->tp_dictoffset;
+    __Pyx__PyExc_StopAsyncIteration_type.tp_base = (PyTypeObject*)PyExc_Exception;
+
+    __Pyx_PyExc_StopAsyncIteration = (PyObject*) __Pyx_FetchCommonType(&__Pyx__PyExc_StopAsyncIteration_type);
+    if (unlikely(!__Pyx_PyExc_StopAsyncIteration))
+        return -1;
+    if (likely(builtins) && unlikely(PyMapping_SetItemString(builtins, (char*) "StopAsyncIteration", __Pyx_PyExc_StopAsyncIteration) < 0))
+        return -1;
+#endif
+    return 0;
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/CpdefEnums.pyx b/contrib/tools/cython_py2/Cython/Utility/CpdefEnums.pyx
new file mode 100644
index 00000000000..aed6cd8584d
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/CpdefEnums.pyx
@@ -0,0 +1,175 @@
+#################### EnumBase ####################
+
+cimport cython
+
+cdef extern from *:
+    int PY_VERSION_HEX
+
+cdef object __Pyx_OrderedDict
+
+if PY_VERSION_HEX >= 0x03060000:
+    __Pyx_OrderedDict = dict
+else:
+    from collections import OrderedDict as __Pyx_OrderedDict
+
+[email protected]
+cdef class __Pyx_EnumMeta(type):
+    def __init__(cls, name, parents, dct):
+        type.__init__(cls, name, parents, dct)
+        cls.__members__ = __Pyx_OrderedDict()
+    def __iter__(cls):
+        return iter(cls.__members__.values())
+    def __getitem__(cls, name):
+        return cls.__members__[name]
+
+# @cython.internal
+cdef object __Pyx_EnumBase
+class __Pyx_EnumBase(int, metaclass=__Pyx_EnumMeta):
+    def __new__(cls, value, name=None):
+        for v in cls:
+            if v == value:
+                return v
+        if name is None:
+            raise ValueError("Unknown enum value: '%s'" % value)
+        res = int.__new__(cls, value)
+        res.name = name
+        setattr(cls, name, res)
+        cls.__members__[name] = res
+        return res
+    def __repr__(self):
+        return "<%s.%s: %d>" % (self.__class__.__name__, self.name, self)
+    def __str__(self):
+        return "%s.%s" % (self.__class__.__name__, self.name)
+
+if PY_VERSION_HEX >= 0x03040000:
+    from enum import IntEnum as __Pyx_EnumBase
+
+cdef object __Pyx_FlagBase
+class __Pyx_FlagBase(int, metaclass=__Pyx_EnumMeta):
+    def __new__(cls, value, name=None):
+        for v in cls:
+            if v == value:
+                return v
+        res = int.__new__(cls, value)
+        if name is None:
+            # some bitwise combination, no validation here
+            res.name = ""
+        else:
+            res.name = name
+            setattr(cls, name, res)
+            cls.__members__[name] = res
+        return res
+    def __repr__(self):
+        return "<%s.%s: %d>" % (self.__class__.__name__, self.name, self)
+    def __str__(self):
+        return "%s.%s" % (self.__class__.__name__, self.name)
+
+if PY_VERSION_HEX >= 0x03060000:
+    from enum import IntFlag as __Pyx_FlagBase
+
+#################### EnumType ####################
+#@requires: EnumBase
+
+cdef extern from *:
+    object {{enum_to_pyint_func}}({{name}} value)
+
+cdef dict __Pyx_globals = globals()
+if PY_VERSION_HEX >= 0x03060000:
+    # create new IntFlag() - the assumption is that C enums are sufficiently commonly
+    # used as flags that this is the most appropriate base class
+    {{name}} = __Pyx_FlagBase('{{name}}', [
+        {{for item in items}}
+        ('{{item}}', {{enum_to_pyint_func}}({{item}})),
+        {{endfor}}
+        # Try to look up the module name dynamically if possible
+    ], module=__Pyx_globals.get("__module__", '{{static_modname}}'))
+
+    if PY_VERSION_HEX >= 0x030B0000:
+        # Python 3.11 starts making the behaviour of flags stricter
+        # (only including powers of 2 when iterating). Since we're using
+        # "flag" because C enums *might* be used as flags, not because
+        # we want strict flag behaviour, manually undo some of this.
+        {{name}}._member_names_ = list({{name}}.__members__)
+
+    {{if enum_doc is not None}}
+    {{name}}.__doc__ = {{ repr(enum_doc) }}
+    {{endif}}
+
+    {{for item in items}}
+    __Pyx_globals['{{item}}'] = {{name}}.{{item}}
+    {{endfor}}
+else:
+    class {{name}}(__Pyx_FlagBase):
+        {{ repr(enum_doc) if enum_doc is not None else 'pass' }}
+    {{for item in items}}
+    __Pyx_globals['{{item}}'] = {{name}}({{enum_to_pyint_func}}({{item}}), '{{item}}')
+    {{endfor}}
+
+#################### CppScopedEnumType ####################
+#@requires: EnumBase
+cdef dict __Pyx_globals = globals()
+
+if PY_VERSION_HEX >= 0x03040000:
+    __Pyx_globals["{{name}}"] = __Pyx_EnumBase('{{name}}', [
+        {{for item in items}}
+        ('{{item}}', <{{underlying_type}}>({{name}}.{{item}})),
+        {{endfor}}
+    ], module=__Pyx_globals.get("__module__", '{{static_modname}}'))
+else:
+    __Pyx_globals["{{name}}"] = type('{{name}}', (__Pyx_EnumBase,), {})
+    {{for item in items}}
+    __Pyx_globals["{{name}}"](<{{underlying_type}}>({{name}}.{{item}}), '{{item}}')
+    {{endfor}}
+
+{{if enum_doc is not None}}
+__Pyx_globals["{{name}}"].__doc__ = {{ repr(enum_doc) }}
+{{endif}}
+
+
+#################### EnumTypeToPy ####################
+
+{{if module_name}}
+cdef object __pyx_imported_enum_{{funcname}} = None
+{{endif}}
+
+@cname("{{funcname}}")
+cdef {{funcname}}({{name}} c_val):
+    cdef object __pyx_enum
+{{if module_name}}
+    global __pyx_imported_enum_{{funcname}}
+    # There's a complication here: the Python enum wrapping is only generated
+    # for enums defined in the same module that they're used in. Therefore, if
+    # the enum was cimported from a different module, we try to import it.
+    # If that fails we return an int equivalent as the next best option.
+    if __pyx_imported_enum_{{funcname}} is None:
+        try:
+            from {{module_name}} import {{name}} as __pyx_imported_enum_{{funcname}}
+        except ImportError:
+            __pyx_imported_enum_{{funcname}} = False  # False indicates "don't try again"
+            import warnings
+            warnings.warn(
+                f"enum class {{name}} not importable from {{module_name}}. "
+                "You are probably using a cpdef enum declared in a .pxd file that "
+                "does not have a .py  or .pyx file.")
+    if __pyx_imported_enum_{{funcname}} is False:
+        # shortcut - if the import failed there's no point repeating it
+        # (and repeating the warning)
+        return <{{underlying_type}}>c_val
+    __pyx_enum = __pyx_imported_enum_{{funcname}}
+{{else}}
+    __pyx_enum = {{name}}
+{{endif}}
+    # TODO - Cython only manages to optimize C enums to a switch currently
+    if 0:
+        pass
+{{for item in items}}
+    elif c_val == {{name}}.{{item}}:
+        return __pyx_enum.{{item}}
+{{endfor}}
+    else:
+        underlying_c_val = <{{underlying_type}}>c_val
+{{if is_flag}}
+        return __pyx_enum(underlying_c_val)
+{{else}}
+        raise ValueError(f"{underlying_c_val} is not a valid {{name}}")
+{{endif}}
diff --git a/contrib/tools/cython_py2/Cython/Utility/CppConvert.pyx b/contrib/tools/cython_py2/Cython/Utility/CppConvert.pyx
new file mode 100644
index 00000000000..92900bfb9f5
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/CppConvert.pyx
@@ -0,0 +1,421 @@
+# TODO: Figure out how many of the pass-by-value copies the compiler can eliminate.
+
+
+#################### string.from_py ####################
+
+cdef extern from *:
+    cdef cppclass string "{{type}}":
+        string() except +
+        string(char* c_str, size_t size) except +
+    cdef const char* __Pyx_PyObject_AsStringAndSize(object, Py_ssize_t*) except NULL
+
+@cname("{{cname}}")
+cdef string {{cname}}(object o) except *:
+    cdef Py_ssize_t length = 0
+    cdef const char* data = __Pyx_PyObject_AsStringAndSize(o, &length)
+    return string(data, length)
+
+
+#################### string.to_py ####################
+
+#cimport cython
+#from libcpp.string cimport string
+cdef extern from *:
+    cdef cppclass string "{{type}}":
+        char* data()
+        size_t size()
+
+{{for py_type in ['PyObject', 'PyUnicode', 'PyStr', 'PyBytes', 'PyByteArray']}}
+cdef extern from *:
+    cdef object __Pyx_{{py_type}}_FromStringAndSize(const char*, size_t)
+
+@cname("{{cname.replace("PyObject", py_type, 1)}}")
+cdef inline object {{cname.replace("PyObject", py_type, 1)}}(const string& s):
+    return __Pyx_{{py_type}}_FromStringAndSize(s.data(), s.size())
+{{endfor}}
+
+
+#################### vector.from_py ####################
+
+cdef extern from *:
+    cdef cppclass vector "std::vector" [T]:
+        void push_back(T&) except +
+
+@cname("{{cname}}")
+cdef vector[X] {{cname}}(object o) except *:
+    cdef vector[X] v
+    for item in o:
+        v.push_back(<X>item)
+    return v
+
+
+#################### vector.to_py ####################
+
+cdef extern from *:
+    cdef cppclass vector "std::vector" [T]:
+        size_t size()
+        T& operator[](size_t)
+
+cdef extern from "Python.h":
+    void Py_INCREF(object)
+    list PyList_New(Py_ssize_t size)
+    void PyList_SET_ITEM(object list, Py_ssize_t i, object o)
+    const Py_ssize_t PY_SSIZE_T_MAX
+
+@cname("{{cname}}")
+cdef object {{cname}}(const vector[X]& v):
+    if v.size() > <size_t> PY_SSIZE_T_MAX:
+        raise MemoryError()
+    v_size_signed = <Py_ssize_t> v.size()
+
+    o = PyList_New(v_size_signed)
+
+    cdef Py_ssize_t i
+    cdef object item
+
+    for i in range(v_size_signed):
+        item = v[i]
+        Py_INCREF(item)
+        PyList_SET_ITEM(o, i, item)
+
+    return o
+
+#################### list.from_py ####################
+
+cdef extern from *:
+    cdef cppclass cpp_list "std::list" [T]:
+        void push_back(T&) except +
+
+@cname("{{cname}}")
+cdef cpp_list[X] {{cname}}(object o) except *:
+    cdef cpp_list[X] l
+    for item in o:
+        l.push_back(<X>item)
+    return l
+
+
+#################### list.to_py ####################
+
+cimport cython
+
+cdef extern from *:
+    cdef cppclass cpp_list "std::list" [T]:
+        cppclass const_iterator:
+            T& operator*()
+            const_iterator operator++()
+            bint operator!=(const_iterator)
+        const_iterator begin()
+        const_iterator end()
+        size_t size()
+
+cdef extern from "Python.h":
+    void Py_INCREF(object)
+    list PyList_New(Py_ssize_t size)
+    void PyList_SET_ITEM(object list, Py_ssize_t i, object o)
+    cdef Py_ssize_t PY_SSIZE_T_MAX
+
+@cname("{{cname}}")
+cdef object {{cname}}(const cpp_list[X]& v):
+    if v.size() > <size_t> PY_SSIZE_T_MAX:
+        raise MemoryError()
+
+    o = PyList_New(<Py_ssize_t> v.size())
+
+    cdef object item
+    cdef Py_ssize_t i = 0
+    cdef cpp_list[X].const_iterator iter = v.begin()
+
+    while iter != v.end():
+        item = cython.operator.dereference(iter)
+        Py_INCREF(item)
+        PyList_SET_ITEM(o, i, item)
+        cython.operator.preincrement(iter)
+        i += 1
+
+    return o
+
+
+#################### set.from_py ####################
+
+cdef extern from *:
+    cdef cppclass set "std::{{maybe_unordered}}set" [T]:
+        void insert(T&) except +
+
+@cname("{{cname}}")
+cdef set[X] {{cname}}(object o) except *:
+    cdef set[X] s
+    for item in o:
+        s.insert(<X>item)
+    return s
+
+
+#################### set.to_py ####################
+
+cimport cython
+
+cdef extern from *:
+    cdef cppclass cpp_set "std::{{maybe_unordered}}set" [T]:
+        cppclass const_iterator:
+            T& operator*()
+            const_iterator operator++()
+            bint operator!=(const_iterator)
+        const_iterator begin()
+        const_iterator end()
+
+@cname("{{cname}}")
+cdef object {{cname}}(const cpp_set[X]& s):
+    return {v for v in s}
+
+#################### pair.from_py ####################
+
+cdef extern from *:
+    cdef cppclass pair "std::pair" [T, U]:
+        pair() except +
+        pair(T&, U&) except +
+
+@cname("{{cname}}")
+cdef pair[X,Y] {{cname}}(object o) except *:
+    x, y = o
+    return pair[X,Y](<X>x, <Y>y)
+
+
+#################### pair.to_py ####################
+
+cdef extern from *:
+    cdef cppclass pair "std::pair" [T, U]:
+        T first
+        U second
+
+@cname("{{cname}}")
+cdef object {{cname}}(const pair[X,Y]& p):
+    return p.first, p.second
+
+
+#################### map.from_py ####################
+
+cdef extern from *:
+    cdef cppclass pair "std::pair" [T, U]:
+        pair(T&, U&) except +
+    cdef cppclass map "std::{{maybe_unordered}}map" [T, U]:
+        void insert(pair[T, U]&) except +
+    cdef cppclass vector "std::vector" [T]:
+        pass
+    int PY_MAJOR_VERSION
+
+
+@cname("{{cname}}")
+cdef map[X,Y] {{cname}}(object o) except *:
+    cdef map[X,Y] m
+    if PY_MAJOR_VERSION < 3:
+        for key, value in o.iteritems():
+            m.insert(pair[X,Y](<X>key, <Y>value))
+    else:
+        for key, value in o.items():
+            m.insert(pair[X,Y](<X>key, <Y>value))
+    return m
+
+
+#################### map.to_py ####################
+# TODO: Work out const so that this can take a const
+# reference rather than pass by value.
+
+cimport cython
+
+cdef extern from *:
+    cdef cppclass map "std::{{maybe_unordered}}map" [T, U]:
+        cppclass value_type:
+            T first
+            U second
+        cppclass const_iterator:
+            value_type& operator*()
+            const_iterator operator++()
+            bint operator!=(const_iterator)
+        const_iterator begin()
+        const_iterator end()
+
+@cname("{{cname}}")
+cdef object {{cname}}(const map[X,Y]& s):
+    o = {}
+    cdef const map[X,Y].value_type *key_value
+    cdef map[X,Y].const_iterator iter = s.begin()
+    while iter != s.end():
+        key_value = &cython.operator.dereference(iter)
+        o[key_value.first] = key_value.second
+        cython.operator.preincrement(iter)
+    return o
+
+
+#################### complex.from_py ####################
+
+cdef extern from *:
+    cdef cppclass std_complex "std::complex" [T]:
+        std_complex()
+        std_complex(T, T) except +
+
+@cname("{{cname}}")
+cdef std_complex[X] {{cname}}(object o) except *:
+    cdef double complex z = o
+    return std_complex[X](<X>z.real, <X>z.imag)
+
+
+#################### complex.to_py ####################
+
+cdef extern from *:
+    cdef cppclass std_complex "std::complex" [T]:
+        X real()
+        X imag()
+
+@cname("{{cname}}")
+cdef object {{cname}}(const std_complex[X]& z):
+    cdef double complex tmp
+    tmp.real = <double>z.real()
+    tmp.imag = <double>z.imag()
+    return tmp
+
+
+#################### arcadia_TMaybe.from_py ####################
+
+cdef extern from *:
+    cdef cppclass TMaybe [T]:
+        TMaybe()
+        TMaybe(T&)
+        TMaybe& operator =(T&)
+
+@cname("{{cname}}")
+cdef TMaybe[X] {{cname}}(object o) except *:
+    cdef TMaybe[X] result
+    if o is not None:
+        result = <X>o
+    return result
+
+#################### arcadia_TMaybe.to_py ####################
+
+cdef extern from *:
+    cdef cppclass TMaybe [T]:
+        bint Defined()
+        T& GetRef()
+
+@cname("{{cname}}")
+cdef object {{cname}}(const TMaybe[X]& s):
+    if s.Defined():
+        return s.GetRef()
+    return None
+
+
+#################### arcadia_TVector.from_py ####################
+
+cdef extern from *:
+    cdef cppclass TVector [T]:
+        void push_back(T&)
+
+@cname("{{cname}}")
+cdef TVector[X] {{cname}}(object o) except *:
+    cdef TVector[X] v
+    for item in o:
+        v.push_back(<X>item)
+    return v
+
+
+#################### arcadia_TVector.to_py ####################
+
+cdef extern from *:
+    cdef cppclass TVector [T]:
+        size_t size()
+        T& operator[](size_t)
+
+@cname("{{cname}}")
+cdef object {{cname}}(const TVector[X]& v):
+    return [v[i] for i in range(v.size())]
+
+
+#################### arcadia_THashMap.from_py ####################
+
+cdef extern from *:
+    cdef cppclass pair "std::pair" [T, U]:
+        pair(T&, U&)
+    cdef cppclass THashMap [T, U]:
+        void insert(pair[T, U]&)
+
+
+@cname("{{cname}}")
+cdef THashMap[X,Y] {{cname}}(object o) except *:
+    cdef dict d = o
+    cdef THashMap[X,Y] m
+    for key, value in d.iteritems():
+        m.insert(pair[X,Y](<X>key, <Y>value))
+    return m
+
+
+#################### arcadia_THashMap.to_py ####################
+
+cimport cython
+
+cdef extern from *:
+    cdef cppclass THashMap [T, U]:
+        cppclass value_type:
+            T first
+            U second
+        cppclass const_iterator:
+            value_type& operator*()
+            const_iterator operator++()
+            bint operator!=(const_iterator)
+        const_iterator begin()
+        const_iterator end()
+
+@cname("{{cname}}")
+cdef dict {{cname}}(const THashMap[X,Y]& s):
+    cdef dict result = {}
+    cdef const THashMap[X,Y].value_type *key_value
+    cdef THashMap[X,Y].const_iterator iter = s.begin()
+    while iter != s.end():
+        key_value = &cython.operator.dereference(iter)
+        result[key_value.first] = key_value.second
+        cython.operator.preincrement(iter)
+    return result
+
+
+#################### arcadia_TMap.from_py ####################
+
+cdef extern from *:
+    cdef cppclass pair "std::pair" [T, U]:
+        pair(T&, U&)
+    cdef cppclass TMap [T, U]:
+        void insert(pair[T, U]&)
+
+
+@cname("{{cname}}")
+cdef TMap[X,Y] {{cname}}(object o) except *:
+    cdef dict d = o
+    cdef TMap[X,Y] m
+    for key, value in d.iteritems():
+        m.insert(pair[X,Y](<X>key, <Y>value))
+    return m
+
+
+#################### arcadia_TMap.to_py ####################
+
+cimport cython
+
+cdef extern from *:
+    cdef cppclass TMap [T, U]:
+        cppclass value_type:
+            T first
+            U second
+        cppclass const_iterator:
+            value_type& operator*()
+            const_iterator operator++()
+            bint operator!=(const_iterator)
+        const_iterator begin()
+        const_iterator end()
+
+@cname("{{cname}}")
+cdef dict {{cname}}(const TMap[X,Y]& s):
+    cdef dict result = {}
+    cdef const TMap[X,Y].value_type *key_value
+    cdef TMap[X,Y].const_iterator iter = s.begin()
+    while iter != s.end():
+        key_value = &cython.operator.dereference(iter)
+        result[key_value.first] = key_value.second
+        cython.operator.preincrement(iter)
+    return result
+
diff --git a/contrib/tools/cython_py2/Cython/Utility/CppSupport.cpp b/contrib/tools/cython_py2/Cython/Utility/CppSupport.cpp
new file mode 100644
index 00000000000..07c9efc71e7
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/CppSupport.cpp
@@ -0,0 +1,124 @@
+/////////////// CppExceptionConversion.proto ///////////////
+
+#ifndef __Pyx_CppExn2PyErr
+#include <new>
+#include <typeinfo>
+#include <stdexcept>
+#include <ios>
+
+static void __Pyx_CppExn2PyErr() {
+  // Catch a handful of different errors here and turn them into the
+  // equivalent Python errors.
+  try {
+    if (PyErr_Occurred())
+      ; // let the latest Python exn pass through and ignore the current one
+    else
+      throw;
+  } catch (const std::bad_alloc& exn) {
+    PyErr_SetString(PyExc_MemoryError, exn.what());
+  } catch (const std::bad_cast& exn) {
+    PyErr_SetString(PyExc_TypeError, exn.what());
+  } catch (const std::bad_typeid& exn) {
+    PyErr_SetString(PyExc_TypeError, exn.what());
+  } catch (const std::domain_error& exn) {
+    PyErr_SetString(PyExc_ValueError, exn.what());
+  } catch (const std::invalid_argument& exn) {
+    PyErr_SetString(PyExc_ValueError, exn.what());
+  } catch (const std::ios_base::failure& exn) {
+    // Unfortunately, in standard C++ we have no way of distinguishing EOF
+    // from other errors here; be careful with the exception mask
+    PyErr_SetString(PyExc_IOError, exn.what());
+  } catch (const std::out_of_range& exn) {
+    // Change out_of_range to IndexError
+    PyErr_SetString(PyExc_IndexError, exn.what());
+  } catch (const std::overflow_error& exn) {
+    PyErr_SetString(PyExc_OverflowError, exn.what());
+  } catch (const std::range_error& exn) {
+    PyErr_SetString(PyExc_ArithmeticError, exn.what());
+  } catch (const std::underflow_error& exn) {
+    PyErr_SetString(PyExc_ArithmeticError, exn.what());
+  } catch (const std::exception& exn) {
+    PyErr_SetString(PyExc_RuntimeError, exn.what());
+  }
+  catch (...)
+  {
+    PyErr_SetString(PyExc_RuntimeError, "Unknown exception");
+  }
+}
+#endif
+
+/////////////// PythranConversion.proto ///////////////
+
+template <class T>
+auto __Pyx_pythran_to_python(T &&value) -> decltype(to_python(
+      typename pythonic::returnable<typename std::remove_cv<typename std::remove_reference<T>::type>::type>::type{std::forward<T>(value)}))
+{
+  using returnable_type = typename pythonic::returnable<typename std::remove_cv<typename std::remove_reference<T>::type>::type>::type;
+  return to_python(returnable_type{std::forward<T>(value)});
+}
+
+#define __Pyx_PythranShapeAccessor(x) (pythonic::builtins::getattr(pythonic::types::attr::SHAPE{}, x))
+
+////////////// MoveIfSupported.proto //////////////////
+
+#if CYTHON_USE_CPP_STD_MOVE
+  #include <utility>
+  #define __PYX_STD_MOVE_IF_SUPPORTED(x) std::move(x)
+#else
+  #define __PYX_STD_MOVE_IF_SUPPORTED(x) x
+#endif
+
+////////////// EnumClassDecl.proto //////////////////
+//@proto_block: utility_code_proto_before_types
+
+#if defined (_MSC_VER)
+  #if _MSC_VER >= 1910
+    #define __PYX_ENUM_CLASS_DECL enum
+  #else
+    #define __PYX_ENUM_CLASS_DECL
+  #endif
+#else
+  #define __PYX_ENUM_CLASS_DECL enum
+#endif
+
+////////////// OptionalLocals.proto ////////////////
+//@proto_block: utility_code_proto_before_types
+#include <optional>
+// since std::optional is a C++17 features, a templated using declaration should be safe
+// (although it could be replaced with a define)
+template <typename T>
+using __Pyx_Optional_BaseType = std::optional<T>;
+
+// This class reuses as much of the implementation of std::optional as possible.
+// The only place it differs significantly is the assignment operators, which use
+// "emplace" (thus requiring move/copy constructors, but not move/copy
+// assignment operators). This is preferred because it lets us work with assignable
+// types (for example those with const members)
+template <typename T>
+class __Pyx_Optional_Type : private __Pyx_Optional_BaseType<T> {
+public:
+    using __Pyx_Optional_BaseType<T>::__Pyx_Optional_BaseType;
+    using __Pyx_Optional_BaseType<T>::has_value;
+    using __Pyx_Optional_BaseType<T>::operator*;
+    using __Pyx_Optional_BaseType<T>::operator->;
+#if __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1600)
+    __Pyx_Optional_Type& operator=(const __Pyx_Optional_Type& rhs) {
+        this->emplace(*rhs);
+        return *this;
+    }
+    __Pyx_Optional_Type& operator=(__Pyx_Optional_Type&& rhs) {
+        this->emplace(std::move(*rhs));
+        return *this;
+    }
+    template <typename U=T>
+    __Pyx_Optional_Type& operator=(U&& rhs) {
+        this->emplace(std::forward<U>(rhs));
+        return *this;
+    }
+#else
+    // Note - the "cpp_locals" feature is designed to require C++14.
+    // This pre-c++11 fallback is largely untested, and definitely won't work
+    // in all the cases that the more modern version does
+    using __Pyx_Optional_BaseType<T>::operator=; // the chances are emplace can't work...
+#endif
+};
diff --git a/contrib/tools/cython_py2/Cython/Utility/CythonFunction.c b/contrib/tools/cython_py2/Cython/Utility/CythonFunction.c
new file mode 100644
index 00000000000..023701c63ae
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/CythonFunction.c
@@ -0,0 +1,1810 @@
+
+//////////////////// CythonFunctionShared.proto ////////////////////
+
+#define __Pyx_CyFunction_USED
+
+#define __Pyx_CYFUNCTION_STATICMETHOD  0x01
+#define __Pyx_CYFUNCTION_CLASSMETHOD   0x02
+#define __Pyx_CYFUNCTION_CCLASS        0x04
+#define __Pyx_CYFUNCTION_COROUTINE     0x08
+
+#define __Pyx_CyFunction_GetClosure(f) \
+    (((__pyx_CyFunctionObject *) (f))->func_closure)
+
+#if PY_VERSION_HEX < 0x030900B1 || CYTHON_COMPILING_IN_LIMITED_API
+  #define __Pyx_CyFunction_GetClassObj(f) \
+      (((__pyx_CyFunctionObject *) (f))->func_classobj)
+#else
+  #define __Pyx_CyFunction_GetClassObj(f) \
+      ((PyObject*) ((PyCMethodObject *) (f))->mm_class)
+#endif
+#define __Pyx_CyFunction_SetClassObj(f, classobj)  \
+    __Pyx__CyFunction_SetClassObj((__pyx_CyFunctionObject *) (f), (classobj))
+
+#define __Pyx_CyFunction_Defaults(type, f) \
+    ((type *)(((__pyx_CyFunctionObject *) (f))->defaults))
+#define __Pyx_CyFunction_SetDefaultsGetter(f, g) \
+    ((__pyx_CyFunctionObject *) (f))->defaults_getter = (g)
+
+
+typedef struct {
+#if CYTHON_COMPILING_IN_LIMITED_API
+    PyObject_HEAD
+    // We can't "inherit" from func, but we can use it as a data store
+    PyObject *func;
+#elif PY_VERSION_HEX < 0x030900B1
+    PyCFunctionObject func;
+#else
+    // PEP-573: PyCFunctionObject + mm_class
+    PyCMethodObject func;
+#endif
+#if CYTHON_BACKPORT_VECTORCALL
+    __pyx_vectorcallfunc func_vectorcall;
+#endif
+#if PY_VERSION_HEX < 0x030500A0 || CYTHON_COMPILING_IN_LIMITED_API
+    PyObject *func_weakreflist;
+#endif
+    PyObject *func_dict;
+    PyObject *func_name;
+    PyObject *func_qualname;
+    PyObject *func_doc;
+    PyObject *func_globals;
+    PyObject *func_code;
+    PyObject *func_closure;
+#if PY_VERSION_HEX < 0x030900B1 || CYTHON_COMPILING_IN_LIMITED_API
+    // No-args super() class cell
+    PyObject *func_classobj;
+#endif
+    // Dynamic default args and annotations
+    void *defaults;
+    int defaults_pyobjects;
+    size_t defaults_size;  /* used by FusedFunction for copying defaults */
+    int flags;
+
+    // Defaults info
+    PyObject *defaults_tuple;   /* Const defaults tuple */
+    PyObject *defaults_kwdict;  /* Const kwonly defaults dict */
+    PyObject *(*defaults_getter)(PyObject *);
+    PyObject *func_annotations; /* function annotations dict */
+
+    // Coroutine marker
+    PyObject *func_is_coroutine;
+} __pyx_CyFunctionObject;
+
+#undef __Pyx_CyOrPyCFunction_Check
+#define __Pyx_CyFunction_Check(obj)  __Pyx_TypeCheck(obj, __pyx_CyFunctionType)
+#define __Pyx_CyOrPyCFunction_Check(obj)  __Pyx_TypeCheck2(obj, __pyx_CyFunctionType, &PyCFunction_Type)
+#define __Pyx_CyFunction_CheckExact(obj)  __Pyx_IS_TYPE(obj, __pyx_CyFunctionType)
+static CYTHON_INLINE int __Pyx__IsSameCyOrCFunction(PyObject *func, void *cfunc);/*proto*/
+#undef __Pyx_IsSameCFunction
+#define __Pyx_IsSameCFunction(func, cfunc)   __Pyx__IsSameCyOrCFunction(func, cfunc)
+
+static PyObject *__Pyx_CyFunction_Init(__pyx_CyFunctionObject* op, PyMethodDef *ml,
+                                      int flags, PyObject* qualname,
+                                      PyObject *closure,
+                                      PyObject *module, PyObject *globals,
+                                      PyObject* code);
+
+static CYTHON_INLINE void __Pyx__CyFunction_SetClassObj(__pyx_CyFunctionObject* f, PyObject* classobj);
+static CYTHON_INLINE void *__Pyx_CyFunction_InitDefaults(PyObject *m,
+                                                         size_t size,
+                                                         int pyobjects);
+static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsTuple(PyObject *m,
+                                                            PyObject *tuple);
+static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsKwDict(PyObject *m,
+                                                             PyObject *dict);
+static CYTHON_INLINE void __Pyx_CyFunction_SetAnnotationsDict(PyObject *m,
+                                                              PyObject *dict);
+
+
+static int __pyx_CyFunction_init(PyObject *module);
+
+#if CYTHON_METH_FASTCALL
+static PyObject * __Pyx_CyFunction_Vectorcall_NOARGS(PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
+static PyObject * __Pyx_CyFunction_Vectorcall_O(PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
+static PyObject * __Pyx_CyFunction_Vectorcall_FASTCALL_KEYWORDS(PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
+static PyObject * __Pyx_CyFunction_Vectorcall_FASTCALL_KEYWORDS_METHOD(PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
+#if CYTHON_BACKPORT_VECTORCALL
+#define __Pyx_CyFunction_func_vectorcall(f) (((__pyx_CyFunctionObject*)f)->func_vectorcall)
+#else
+#define __Pyx_CyFunction_func_vectorcall(f) (((PyCFunctionObject*)f)->vectorcall)
+#endif
+#endif
+
+//////////////////// CythonFunctionShared ////////////////////
+//@substitute: naming
+//@requires: CommonStructures.c::FetchCommonType
+//@requires: ObjectHandling.c::PyMethodNew
+//@requires: ObjectHandling.c::PyVectorcallFastCallDict
+//@requires: ModuleSetupCode.c::IncludeStructmemberH
+//@requires: ObjectHandling.c::PyObjectGetAttrStr
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+static CYTHON_INLINE int __Pyx__IsSameCyOrCFunction(PyObject *func, void *cfunc) {
+    if (__Pyx_CyFunction_Check(func)) {
+        return PyCFunction_GetFunction(((__pyx_CyFunctionObject*)func)->func) == (PyCFunction) cfunc;
+    } else if (PyCFunction_Check(func)) {
+        return PyCFunction_GetFunction(func) == (PyCFunction) cfunc;
+    }
+    return 0;
+}
+#else
+static CYTHON_INLINE int __Pyx__IsSameCyOrCFunction(PyObject *func, void *cfunc) {
+    return __Pyx_CyOrPyCFunction_Check(func) && __Pyx_CyOrPyCFunction_GET_FUNCTION(func) == (PyCFunction) cfunc;
+}
+#endif
+
+static CYTHON_INLINE void __Pyx__CyFunction_SetClassObj(__pyx_CyFunctionObject* f, PyObject* classobj) {
+#if PY_VERSION_HEX < 0x030900B1 || CYTHON_COMPILING_IN_LIMITED_API
+    __Pyx_Py_XDECREF_SET(
+        __Pyx_CyFunction_GetClassObj(f),
+            ((classobj) ? __Pyx_NewRef(classobj) : NULL));
+#else
+    __Pyx_Py_XDECREF_SET(
+        // assigning to "mm_class", which is a "PyTypeObject*"
+        ((PyCMethodObject *) (f))->mm_class,
+        (PyTypeObject*)((classobj) ? __Pyx_NewRef(classobj) : NULL));
+#endif
+}
+
+static PyObject *
+__Pyx_CyFunction_get_doc(__pyx_CyFunctionObject *op, void *closure)
+{
+    CYTHON_UNUSED_VAR(closure);
+    if (unlikely(op->func_doc == NULL)) {
+#if CYTHON_COMPILING_IN_LIMITED_API
+        op->func_doc = PyObject_GetAttrString(op->func, "__doc__");
+        if (unlikely(!op->func_doc)) return NULL;
+#else
+        if (((PyCFunctionObject*)op)->m_ml->ml_doc) {
+#if PY_MAJOR_VERSION >= 3
+            op->func_doc = PyUnicode_FromString(((PyCFunctionObject*)op)->m_ml->ml_doc);
+#else
+            op->func_doc = PyString_FromString(((PyCFunctionObject*)op)->m_ml->ml_doc);
+#endif
+            if (unlikely(op->func_doc == NULL))
+                return NULL;
+        } else {
+            Py_INCREF(Py_None);
+            return Py_None;
+        }
+#endif   /* CYTHON_COMPILING_IN_LIMITED_API */
+    }
+    Py_INCREF(op->func_doc);
+    return op->func_doc;
+}
+
+static int
+__Pyx_CyFunction_set_doc(__pyx_CyFunctionObject *op, PyObject *value, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+    if (value == NULL) {
+        // Mark as deleted
+        value = Py_None;
+    }
+    Py_INCREF(value);
+    __Pyx_Py_XDECREF_SET(op->func_doc, value);
+    return 0;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_name(__pyx_CyFunctionObject *op, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+    if (unlikely(op->func_name == NULL)) {
+#if CYTHON_COMPILING_IN_LIMITED_API
+        op->func_name = PyObject_GetAttrString(op->func, "__name__");
+#elif PY_MAJOR_VERSION >= 3
+        op->func_name = PyUnicode_InternFromString(((PyCFunctionObject*)op)->m_ml->ml_name);
+#else
+        op->func_name = PyString_InternFromString(((PyCFunctionObject*)op)->m_ml->ml_name);
+#endif  /* CYTHON_COMPILING_IN_LIMITED_API */
+        if (unlikely(op->func_name == NULL))
+            return NULL;
+    }
+    Py_INCREF(op->func_name);
+    return op->func_name;
+}
+
+static int
+__Pyx_CyFunction_set_name(__pyx_CyFunctionObject *op, PyObject *value, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+#if PY_MAJOR_VERSION >= 3
+    if (unlikely(value == NULL || !PyUnicode_Check(value)))
+#else
+    if (unlikely(value == NULL || !PyString_Check(value)))
+#endif
+    {
+        PyErr_SetString(PyExc_TypeError,
+                        "__name__ must be set to a string object");
+        return -1;
+    }
+    Py_INCREF(value);
+    __Pyx_Py_XDECREF_SET(op->func_name, value);
+    return 0;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_qualname(__pyx_CyFunctionObject *op, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+    Py_INCREF(op->func_qualname);
+    return op->func_qualname;
+}
+
+static int
+__Pyx_CyFunction_set_qualname(__pyx_CyFunctionObject *op, PyObject *value, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+#if PY_MAJOR_VERSION >= 3
+    if (unlikely(value == NULL || !PyUnicode_Check(value)))
+#else
+    if (unlikely(value == NULL || !PyString_Check(value)))
+#endif
+    {
+        PyErr_SetString(PyExc_TypeError,
+                        "__qualname__ must be set to a string object");
+        return -1;
+    }
+    Py_INCREF(value);
+    __Pyx_Py_XDECREF_SET(op->func_qualname, value);
+    return 0;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_dict(__pyx_CyFunctionObject *op, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+    if (unlikely(op->func_dict == NULL)) {
+        op->func_dict = PyDict_New();
+        if (unlikely(op->func_dict == NULL))
+            return NULL;
+    }
+    Py_INCREF(op->func_dict);
+    return op->func_dict;
+}
+
+static int
+__Pyx_CyFunction_set_dict(__pyx_CyFunctionObject *op, PyObject *value, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+    if (unlikely(value == NULL)) {
+        PyErr_SetString(PyExc_TypeError,
+               "function's dictionary may not be deleted");
+        return -1;
+    }
+    if (unlikely(!PyDict_Check(value))) {
+        PyErr_SetString(PyExc_TypeError,
+               "setting function's dictionary to a non-dict");
+        return -1;
+    }
+    Py_INCREF(value);
+    __Pyx_Py_XDECREF_SET(op->func_dict, value);
+    return 0;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_globals(__pyx_CyFunctionObject *op, void *context)
+{
+    CYTHON_UNUSED_VAR(context);
+    Py_INCREF(op->func_globals);
+    return op->func_globals;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_closure(__pyx_CyFunctionObject *op, void *context)
+{
+    CYTHON_UNUSED_VAR(op);
+    CYTHON_UNUSED_VAR(context);
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_code(__pyx_CyFunctionObject *op, void *context)
+{
+    PyObject* result = (op->func_code) ? op->func_code : Py_None;
+    CYTHON_UNUSED_VAR(context);
+    Py_INCREF(result);
+    return result;
+}
+
+static int
+__Pyx_CyFunction_init_defaults(__pyx_CyFunctionObject *op) {
+    int result = 0;
+    PyObject *res = op->defaults_getter((PyObject *) op);
+    if (unlikely(!res))
+        return -1;
+
+    // Cache result
+    #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+    op->defaults_tuple = PyTuple_GET_ITEM(res, 0);
+    Py_INCREF(op->defaults_tuple);
+    op->defaults_kwdict = PyTuple_GET_ITEM(res, 1);
+    Py_INCREF(op->defaults_kwdict);
+    #else
+    op->defaults_tuple = __Pyx_PySequence_ITEM(res, 0);
+    if (unlikely(!op->defaults_tuple)) result = -1;
+    else {
+        op->defaults_kwdict = __Pyx_PySequence_ITEM(res, 1);
+        if (unlikely(!op->defaults_kwdict)) result = -1;
+    }
+    #endif
+    Py_DECREF(res);
+    return result;
+}
+
+static int
+__Pyx_CyFunction_set_defaults(__pyx_CyFunctionObject *op, PyObject* value, void *context) {
+    CYTHON_UNUSED_VAR(context);
+    if (!value) {
+        // del => explicit None to prevent rebuilding
+        value = Py_None;
+    } else if (unlikely(value != Py_None && !PyTuple_Check(value))) {
+        PyErr_SetString(PyExc_TypeError,
+                        "__defaults__ must be set to a tuple object");
+        return -1;
+    }
+    PyErr_WarnEx(PyExc_RuntimeWarning, "changes to cyfunction.__defaults__ will not "
+                 "currently affect the values used in function calls", 1);
+    Py_INCREF(value);
+    __Pyx_Py_XDECREF_SET(op->defaults_tuple, value);
+    return 0;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_defaults(__pyx_CyFunctionObject *op, void *context) {
+    PyObject* result = op->defaults_tuple;
+    CYTHON_UNUSED_VAR(context);
+    if (unlikely(!result)) {
+        if (op->defaults_getter) {
+            if (unlikely(__Pyx_CyFunction_init_defaults(op) < 0)) return NULL;
+            result = op->defaults_tuple;
+        } else {
+            result = Py_None;
+        }
+    }
+    Py_INCREF(result);
+    return result;
+}
+
+static int
+__Pyx_CyFunction_set_kwdefaults(__pyx_CyFunctionObject *op, PyObject* value, void *context) {
+    CYTHON_UNUSED_VAR(context);
+    if (!value) {
+        // del => explicit None to prevent rebuilding
+        value = Py_None;
+    } else if (unlikely(value != Py_None && !PyDict_Check(value))) {
+        PyErr_SetString(PyExc_TypeError,
+                        "__kwdefaults__ must be set to a dict object");
+        return -1;
+    }
+    PyErr_WarnEx(PyExc_RuntimeWarning, "changes to cyfunction.__kwdefaults__ will not "
+                 "currently affect the values used in function calls", 1);
+    Py_INCREF(value);
+    __Pyx_Py_XDECREF_SET(op->defaults_kwdict, value);
+    return 0;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_kwdefaults(__pyx_CyFunctionObject *op, void *context) {
+    PyObject* result = op->defaults_kwdict;
+    CYTHON_UNUSED_VAR(context);
+    if (unlikely(!result)) {
+        if (op->defaults_getter) {
+            if (unlikely(__Pyx_CyFunction_init_defaults(op) < 0)) return NULL;
+            result = op->defaults_kwdict;
+        } else {
+            result = Py_None;
+        }
+    }
+    Py_INCREF(result);
+    return result;
+}
+
+static int
+__Pyx_CyFunction_set_annotations(__pyx_CyFunctionObject *op, PyObject* value, void *context) {
+    CYTHON_UNUSED_VAR(context);
+    if (!value || value == Py_None) {
+        value = NULL;
+    } else if (unlikely(!PyDict_Check(value))) {
+        PyErr_SetString(PyExc_TypeError,
+                        "__annotations__ must be set to a dict object");
+        return -1;
+    }
+    Py_XINCREF(value);
+    __Pyx_Py_XDECREF_SET(op->func_annotations, value);
+    return 0;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_annotations(__pyx_CyFunctionObject *op, void *context) {
+    PyObject* result = op->func_annotations;
+    CYTHON_UNUSED_VAR(context);
+    if (unlikely(!result)) {
+        result = PyDict_New();
+        if (unlikely(!result)) return NULL;
+        op->func_annotations = result;
+    }
+    Py_INCREF(result);
+    return result;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_is_coroutine(__pyx_CyFunctionObject *op, void *context) {
+    int is_coroutine;
+    CYTHON_UNUSED_VAR(context);
+    if (op->func_is_coroutine) {
+        return __Pyx_NewRef(op->func_is_coroutine);
+    }
+
+    is_coroutine = op->flags & __Pyx_CYFUNCTION_COROUTINE;
+#if PY_VERSION_HEX >= 0x03050000
+    if (is_coroutine) {
+        PyObject *module, *fromlist, *marker = PYIDENT("_is_coroutine");
+        fromlist = PyList_New(1);
+        if (unlikely(!fromlist)) return NULL;
+        Py_INCREF(marker);
+#if CYTHON_ASSUME_SAFE_MACROS
+        PyList_SET_ITEM(fromlist, 0, marker);
+#else
+        if (unlikely(PyList_SetItem(fromlist, 0, marker) < 0)) {
+            Py_DECREF(marker);
+            Py_DECREF(fromlist);
+            return NULL;
+        }
+#endif
+        module = PyImport_ImportModuleLevelObject(PYIDENT("asyncio.coroutines"), NULL, NULL, fromlist, 0);
+        Py_DECREF(fromlist);
+        if (unlikely(!module)) goto ignore;
+        op->func_is_coroutine = __Pyx_PyObject_GetAttrStr(module, marker);
+        Py_DECREF(module);
+        if (likely(op->func_is_coroutine)) {
+            return __Pyx_NewRef(op->func_is_coroutine);
+        }
+ignore:
+        PyErr_Clear();
+    }
+#endif
+
+    op->func_is_coroutine = __Pyx_PyBool_FromLong(is_coroutine);
+    return __Pyx_NewRef(op->func_is_coroutine);
+}
+
+//#if PY_VERSION_HEX >= 0x030400C1
+//static PyObject *
+//__Pyx_CyFunction_get_signature(__pyx_CyFunctionObject *op, void *context) {
+//    PyObject *inspect_module, *signature_class, *signature;
+//    CYTHON_UNUSED_VAR(context);
+//    // from inspect import Signature
+//    inspect_module = PyImport_ImportModuleLevelObject(PYIDENT("inspect"), NULL, NULL, NULL, 0);
+//    if (unlikely(!inspect_module))
+//        goto bad;
+//    signature_class = __Pyx_PyObject_GetAttrStr(inspect_module, PYIDENT("Signature"));
+//    Py_DECREF(inspect_module);
+//    if (unlikely(!signature_class))
+//        goto bad;
+//    // return Signature.from_function(op)
+//    signature = PyObject_CallMethodObjArgs(signature_class, PYIDENT("from_function"), op, NULL);
+//    Py_DECREF(signature_class);
+//    if (likely(signature))
+//        return signature;
+//bad:
+//    // make sure we raise an AttributeError from this property on any errors
+//    if (!PyErr_ExceptionMatches(PyExc_AttributeError))
+//        PyErr_SetString(PyExc_AttributeError, "failed to calculate __signature__");
+//    return NULL;
+//}
+//#endif
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+static PyObject *
+__Pyx_CyFunction_get_module(__pyx_CyFunctionObject *op, void *context) {
+    CYTHON_UNUSED_VAR(context);
+    return PyObject_GetAttrString(op->func, "__module__");
+}
+
+static int
+__Pyx_CyFunction_set_module(__pyx_CyFunctionObject *op, PyObject* value, void *context) {
+    CYTHON_UNUSED_VAR(context);
+    return PyObject_SetAttrString(op->func, "__module__", value);
+}
+#endif
+
+static PyGetSetDef __pyx_CyFunction_getsets[] = {
+    {(char *) "func_doc", (getter)__Pyx_CyFunction_get_doc, (setter)__Pyx_CyFunction_set_doc, 0, 0},
+    {(char *) "__doc__",  (getter)__Pyx_CyFunction_get_doc, (setter)__Pyx_CyFunction_set_doc, 0, 0},
+    {(char *) "func_name", (getter)__Pyx_CyFunction_get_name, (setter)__Pyx_CyFunction_set_name, 0, 0},
+    {(char *) "__name__", (getter)__Pyx_CyFunction_get_name, (setter)__Pyx_CyFunction_set_name, 0, 0},
+    {(char *) "__qualname__", (getter)__Pyx_CyFunction_get_qualname, (setter)__Pyx_CyFunction_set_qualname, 0, 0},
+    {(char *) "func_dict", (getter)__Pyx_CyFunction_get_dict, (setter)__Pyx_CyFunction_set_dict, 0, 0},
+    {(char *) "__dict__", (getter)__Pyx_CyFunction_get_dict, (setter)__Pyx_CyFunction_set_dict, 0, 0},
+    {(char *) "func_globals", (getter)__Pyx_CyFunction_get_globals, 0, 0, 0},
+    {(char *) "__globals__", (getter)__Pyx_CyFunction_get_globals, 0, 0, 0},
+    {(char *) "func_closure", (getter)__Pyx_CyFunction_get_closure, 0, 0, 0},
+    {(char *) "__closure__", (getter)__Pyx_CyFunction_get_closure, 0, 0, 0},
+    {(char *) "func_code", (getter)__Pyx_CyFunction_get_code, 0, 0, 0},
+    {(char *) "__code__", (getter)__Pyx_CyFunction_get_code, 0, 0, 0},
+    {(char *) "func_defaults", (getter)__Pyx_CyFunction_get_defaults, (setter)__Pyx_CyFunction_set_defaults, 0, 0},
+    {(char *) "__defaults__", (getter)__Pyx_CyFunction_get_defaults, (setter)__Pyx_CyFunction_set_defaults, 0, 0},
+    {(char *) "__kwdefaults__", (getter)__Pyx_CyFunction_get_kwdefaults, (setter)__Pyx_CyFunction_set_kwdefaults, 0, 0},
+    {(char *) "__annotations__", (getter)__Pyx_CyFunction_get_annotations, (setter)__Pyx_CyFunction_set_annotations, 0, 0},
+    {(char *) "_is_coroutine", (getter)__Pyx_CyFunction_get_is_coroutine, 0, 0, 0},
+//#if PY_VERSION_HEX >= 0x030400C1
+//    {(char *) "__signature__", (getter)__Pyx_CyFunction_get_signature, 0, 0, 0},
+//#endif
+#if CYTHON_COMPILING_IN_LIMITED_API
+    {"__module__", (getter)__Pyx_CyFunction_get_module, (setter)__Pyx_CyFunction_set_module, 0, 0},
+#endif
+    {0, 0, 0, 0, 0}
+};
+
+static PyMemberDef __pyx_CyFunction_members[] = {
+#if !CYTHON_COMPILING_IN_LIMITED_API
+    {(char *) "__module__", T_OBJECT, offsetof(PyCFunctionObject, m_module), 0, 0},
+#endif
+#if CYTHON_USE_TYPE_SPECS
+    {(char *) "__dictoffset__", T_PYSSIZET, offsetof(__pyx_CyFunctionObject, func_dict), READONLY, 0},
+#if CYTHON_METH_FASTCALL
+#if CYTHON_BACKPORT_VECTORCALL
+    {(char *) "__vectorcalloffset__", T_PYSSIZET, offsetof(__pyx_CyFunctionObject, func_vectorcall), READONLY, 0},
+#else
+#if !CYTHON_COMPILING_IN_LIMITED_API
+    {(char *) "__vectorcalloffset__", T_PYSSIZET, offsetof(PyCFunctionObject, vectorcall), READONLY, 0},
+#endif
+#endif
+#endif
+#if PY_VERSION_HEX < 0x030500A0 || CYTHON_COMPILING_IN_LIMITED_API
+    {(char *) "__weaklistoffset__", T_PYSSIZET, offsetof(__pyx_CyFunctionObject, func_weakreflist), READONLY, 0},
+#else
+    {(char *) "__weaklistoffset__", T_PYSSIZET, offsetof(PyCFunctionObject, m_weakreflist), READONLY, 0},
+#endif
+#endif
+    {0, 0, 0,  0, 0}
+};
+
+static PyObject *
+__Pyx_CyFunction_reduce(__pyx_CyFunctionObject *m, PyObject *args)
+{
+    CYTHON_UNUSED_VAR(args);
+#if PY_MAJOR_VERSION >= 3
+    Py_INCREF(m->func_qualname);
+    return m->func_qualname;
+#else
+    return PyString_FromString(((PyCFunctionObject*)m)->m_ml->ml_name);
+#endif
+}
+
+static PyMethodDef __pyx_CyFunction_methods[] = {
+    {"__reduce__", (PyCFunction)__Pyx_CyFunction_reduce, METH_VARARGS, 0},
+    {0, 0, 0, 0}
+};
+
+
+#if PY_VERSION_HEX < 0x030500A0 || CYTHON_COMPILING_IN_LIMITED_API
+#define __Pyx_CyFunction_weakreflist(cyfunc) ((cyfunc)->func_weakreflist)
+#else
+#define __Pyx_CyFunction_weakreflist(cyfunc) (((PyCFunctionObject*)cyfunc)->m_weakreflist)
+#endif
+
+static PyObject *__Pyx_CyFunction_Init(__pyx_CyFunctionObject *op, PyMethodDef *ml, int flags, PyObject* qualname,
+                                       PyObject *closure, PyObject *module, PyObject* globals, PyObject* code) {
+#if !CYTHON_COMPILING_IN_LIMITED_API
+    PyCFunctionObject *cf = (PyCFunctionObject*) op;
+#endif
+    if (unlikely(op == NULL))
+        return NULL;
+#if CYTHON_COMPILING_IN_LIMITED_API
+    // Note that we end up with a circular reference to op. This isn't
+    // a disaster, but in an ideal world it'd be nice to avoid it.
+    op->func = PyCFunction_NewEx(ml, (PyObject*)op, module);
+    if (unlikely(!op->func)) return NULL;
+#endif
+    op->flags = flags;
+    __Pyx_CyFunction_weakreflist(op) = NULL;
+#if !CYTHON_COMPILING_IN_LIMITED_API
+    cf->m_ml = ml;
+    cf->m_self = (PyObject *) op;
+#endif
+    Py_XINCREF(closure);
+    op->func_closure = closure;
+#if !CYTHON_COMPILING_IN_LIMITED_API
+    Py_XINCREF(module);
+    cf->m_module = module;
+#endif
+    op->func_dict = NULL;
+    op->func_name = NULL;
+    Py_INCREF(qualname);
+    op->func_qualname = qualname;
+    op->func_doc = NULL;
+#if PY_VERSION_HEX < 0x030900B1 || CYTHON_COMPILING_IN_LIMITED_API
+    op->func_classobj = NULL;
+#else
+    ((PyCMethodObject*)op)->mm_class = NULL;
+#endif
+    op->func_globals = globals;
+    Py_INCREF(op->func_globals);
+    Py_XINCREF(code);
+    op->func_code = code;
+    // Dynamic Default args
+    op->defaults_pyobjects = 0;
+    op->defaults_size = 0;
+    op->defaults = NULL;
+    op->defaults_tuple = NULL;
+    op->defaults_kwdict = NULL;
+    op->defaults_getter = NULL;
+    op->func_annotations = NULL;
+    op->func_is_coroutine = NULL;
+#if CYTHON_METH_FASTCALL
+    switch (ml->ml_flags & (METH_VARARGS | METH_FASTCALL | METH_NOARGS | METH_O | METH_KEYWORDS | METH_METHOD)) {
+    case METH_NOARGS:
+        __Pyx_CyFunction_func_vectorcall(op) = __Pyx_CyFunction_Vectorcall_NOARGS;
+        break;
+    case METH_O:
+        __Pyx_CyFunction_func_vectorcall(op) = __Pyx_CyFunction_Vectorcall_O;
+        break;
+    // case METH_FASTCALL is not used
+    case METH_METHOD | METH_FASTCALL | METH_KEYWORDS:
+        __Pyx_CyFunction_func_vectorcall(op) = __Pyx_CyFunction_Vectorcall_FASTCALL_KEYWORDS_METHOD;
+        break;
+    case METH_FASTCALL | METH_KEYWORDS:
+        __Pyx_CyFunction_func_vectorcall(op) = __Pyx_CyFunction_Vectorcall_FASTCALL_KEYWORDS;
+        break;
+    // case METH_VARARGS is not used
+    case METH_VARARGS | METH_KEYWORDS:
+        __Pyx_CyFunction_func_vectorcall(op) = NULL;
+        break;
+    default:
+        PyErr_SetString(PyExc_SystemError, "Bad call flags for CyFunction");
+        Py_DECREF(op);
+        return NULL;
+    }
+#endif
+    return (PyObject *) op;
+}
+
+static int
+__Pyx_CyFunction_clear(__pyx_CyFunctionObject *m)
+{
+    Py_CLEAR(m->func_closure);
+#if CYTHON_COMPILING_IN_LIMITED_API
+    Py_CLEAR(m->func);
+#else
+    Py_CLEAR(((PyCFunctionObject*)m)->m_module);
+#endif
+    Py_CLEAR(m->func_dict);
+    Py_CLEAR(m->func_name);
+    Py_CLEAR(m->func_qualname);
+    Py_CLEAR(m->func_doc);
+    Py_CLEAR(m->func_globals);
+    Py_CLEAR(m->func_code);
+#if !CYTHON_COMPILING_IN_LIMITED_API
+#if PY_VERSION_HEX < 0x030900B1
+    Py_CLEAR(__Pyx_CyFunction_GetClassObj(m));
+#else
+    {
+        PyObject *cls = (PyObject*) ((PyCMethodObject *) (m))->mm_class;
+        ((PyCMethodObject *) (m))->mm_class = NULL;
+        Py_XDECREF(cls);
+    }
+#endif
+#endif
+    Py_CLEAR(m->defaults_tuple);
+    Py_CLEAR(m->defaults_kwdict);
+    Py_CLEAR(m->func_annotations);
+    Py_CLEAR(m->func_is_coroutine);
+
+    if (m->defaults) {
+        PyObject **pydefaults = __Pyx_CyFunction_Defaults(PyObject *, m);
+        int i;
+
+        for (i = 0; i < m->defaults_pyobjects; i++)
+            Py_XDECREF(pydefaults[i]);
+
+        PyObject_Free(m->defaults);
+        m->defaults = NULL;
+    }
+
+    return 0;
+}
+
+static void __Pyx__CyFunction_dealloc(__pyx_CyFunctionObject *m)
+{
+    if (__Pyx_CyFunction_weakreflist(m) != NULL)
+        PyObject_ClearWeakRefs((PyObject *) m);
+    __Pyx_CyFunction_clear(m);
+    __Pyx_PyHeapTypeObject_GC_Del(m);
+}
+
+static void __Pyx_CyFunction_dealloc(__pyx_CyFunctionObject *m)
+{
+    PyObject_GC_UnTrack(m);
+    __Pyx__CyFunction_dealloc(m);
+}
+
+static int __Pyx_CyFunction_traverse(__pyx_CyFunctionObject *m, visitproc visit, void *arg)
+{
+    Py_VISIT(m->func_closure);
+#if CYTHON_COMPILING_IN_LIMITED_API
+    Py_VISIT(m->func);
+#else
+    Py_VISIT(((PyCFunctionObject*)m)->m_module);
+#endif
+    Py_VISIT(m->func_dict);
+    Py_VISIT(m->func_name);
+    Py_VISIT(m->func_qualname);
+    Py_VISIT(m->func_doc);
+    Py_VISIT(m->func_globals);
+    Py_VISIT(m->func_code);
+#if !CYTHON_COMPILING_IN_LIMITED_API
+    Py_VISIT(__Pyx_CyFunction_GetClassObj(m));
+#endif
+    Py_VISIT(m->defaults_tuple);
+    Py_VISIT(m->defaults_kwdict);
+    Py_VISIT(m->func_is_coroutine);
+
+    if (m->defaults) {
+        PyObject **pydefaults = __Pyx_CyFunction_Defaults(PyObject *, m);
+        int i;
+
+        for (i = 0; i < m->defaults_pyobjects; i++)
+            Py_VISIT(pydefaults[i]);
+    }
+
+    return 0;
+}
+
+static PyObject*
+__Pyx_CyFunction_repr(__pyx_CyFunctionObject *op)
+{
+#if PY_MAJOR_VERSION >= 3
+    return PyUnicode_FromFormat("<cyfunction %U at %p>",
+                                op->func_qualname, (void *)op);
+#else
+    return PyString_FromFormat("<cyfunction %s at %p>",
+                               PyString_AsString(op->func_qualname), (void *)op);
+#endif
+}
+
+static PyObject * __Pyx_CyFunction_CallMethod(PyObject *func, PyObject *self, PyObject *arg, PyObject *kw) {
+    // originally copied from PyCFunction_Call() in CPython's Objects/methodobject.c
+#if CYTHON_COMPILING_IN_LIMITED_API
+    PyObject *f = ((__pyx_CyFunctionObject*)func)->func;
+    PyObject *py_name = NULL;
+    PyCFunction meth;
+    int flags;
+    meth = PyCFunction_GetFunction(f);
+    if (unlikely(!meth)) return NULL;
+    flags = PyCFunction_GetFlags(f);
+    if (unlikely(flags < 0)) return NULL;
+#else
+    PyCFunctionObject* f = (PyCFunctionObject*)func;
+    PyCFunction meth = f->m_ml->ml_meth;
+    int flags = f->m_ml->ml_flags;
+#endif
+
+    Py_ssize_t size;
+
+    switch (flags & (METH_VARARGS | METH_KEYWORDS | METH_NOARGS | METH_O)) {
+    case METH_VARARGS:
+        if (likely(kw == NULL || PyDict_Size(kw) == 0))
+            return (*meth)(self, arg);
+        break;
+    case METH_VARARGS | METH_KEYWORDS:
+        return (*(PyCFunctionWithKeywords)(void*)meth)(self, arg, kw);
+    case METH_NOARGS:
+        if (likely(kw == NULL || PyDict_Size(kw) == 0)) {
+#if CYTHON_ASSUME_SAFE_MACROS
+            size = PyTuple_GET_SIZE(arg);
+#else
+            size = PyTuple_Size(arg);
+            if (unlikely(size < 0)) return NULL;
+#endif
+            if (likely(size == 0))
+                return (*meth)(self, NULL);
+#if CYTHON_COMPILING_IN_LIMITED_API
+            py_name = __Pyx_CyFunction_get_name((__pyx_CyFunctionObject*)func, NULL);
+            if (!py_name) return NULL;
+            PyErr_Format(PyExc_TypeError,
+                "%.200S() takes no arguments (%" CYTHON_FORMAT_SSIZE_T "d given)",
+                py_name, size);
+            Py_DECREF(py_name);
+#else
+            PyErr_Format(PyExc_TypeError,
+                "%.200s() takes no arguments (%" CYTHON_FORMAT_SSIZE_T "d given)",
+                f->m_ml->ml_name, size);
+#endif
+            return NULL;
+        }
+        break;
+    case METH_O:
+        if (likely(kw == NULL || PyDict_Size(kw) == 0)) {
+#if CYTHON_ASSUME_SAFE_MACROS
+            size = PyTuple_GET_SIZE(arg);
+#else
+            size = PyTuple_Size(arg);
+            if (unlikely(size < 0)) return NULL;
+#endif
+            if (likely(size == 1)) {
+                PyObject *result, *arg0;
+                #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+                arg0 = PyTuple_GET_ITEM(arg, 0);
+                #else
+                arg0 = __Pyx_PySequence_ITEM(arg, 0); if (unlikely(!arg0)) return NULL;
+                #endif
+                result = (*meth)(self, arg0);
+                #if !(CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS)
+                Py_DECREF(arg0);
+                #endif
+                return result;
+            }
+#if CYTHON_COMPILING_IN_LIMITED_API
+            py_name = __Pyx_CyFunction_get_name((__pyx_CyFunctionObject*)func, NULL);
+            if (!py_name) return NULL;
+            PyErr_Format(PyExc_TypeError,
+                "%.200S() takes exactly one argument (%" CYTHON_FORMAT_SSIZE_T "d given)",
+                py_name, size);
+            Py_DECREF(py_name);
+#else
+            PyErr_Format(PyExc_TypeError,
+                "%.200s() takes exactly one argument (%" CYTHON_FORMAT_SSIZE_T "d given)",
+                f->m_ml->ml_name, size);
+#endif
+
+            return NULL;
+        }
+        break;
+    default:
+        PyErr_SetString(PyExc_SystemError, "Bad call flags for CyFunction");
+        return NULL;
+    }
+#if CYTHON_COMPILING_IN_LIMITED_API
+    py_name = __Pyx_CyFunction_get_name((__pyx_CyFunctionObject*)func, NULL);
+    if (!py_name) return NULL;
+    PyErr_Format(PyExc_TypeError, "%.200S() takes no keyword arguments",
+                 py_name);
+    Py_DECREF(py_name);
+#else
+    PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
+                 f->m_ml->ml_name);
+#endif
+    return NULL;
+}
+
+static CYTHON_INLINE PyObject *__Pyx_CyFunction_Call(PyObject *func, PyObject *arg, PyObject *kw) {
+    PyObject *self, *result;
+#if CYTHON_COMPILING_IN_LIMITED_API
+    // PyCFunction_GetSelf returns a borrowed reference
+    self = PyCFunction_GetSelf(((__pyx_CyFunctionObject*)func)->func);
+    if (unlikely(!self) && PyErr_Occurred()) return NULL;
+#else
+    self = ((PyCFunctionObject*)func)->m_self;
+#endif
+    result = __Pyx_CyFunction_CallMethod(func, self, arg, kw);
+    return result;
+}
+
+static PyObject *__Pyx_CyFunction_CallAsMethod(PyObject *func, PyObject *args, PyObject *kw) {
+    PyObject *result;
+    __pyx_CyFunctionObject *cyfunc = (__pyx_CyFunctionObject *) func;
+
+#if CYTHON_METH_FASTCALL
+    // Prefer vectorcall if available. This is not the typical case, as
+    // CPython would normally use vectorcall directly instead of tp_call.
+     __pyx_vectorcallfunc vc = __Pyx_CyFunction_func_vectorcall(cyfunc);
+    if (vc) {
+#if CYTHON_ASSUME_SAFE_MACROS
+        return __Pyx_PyVectorcall_FastCallDict(func, vc, &PyTuple_GET_ITEM(args, 0), (size_t)PyTuple_GET_SIZE(args), kw);
+#else
+        // avoid unused function warning
+        (void) &__Pyx_PyVectorcall_FastCallDict;
+        return PyVectorcall_Call(func, args, kw);
+#endif
+    }
+#endif
+
+    if ((cyfunc->flags & __Pyx_CYFUNCTION_CCLASS) && !(cyfunc->flags & __Pyx_CYFUNCTION_STATICMETHOD)) {
+        Py_ssize_t argc;
+        PyObject *new_args;
+        PyObject *self;
+
+#if CYTHON_ASSUME_SAFE_MACROS
+        argc = PyTuple_GET_SIZE(args);
+#else
+        argc = PyTuple_Size(args);
+        if (unlikely(!argc) < 0) return NULL;
+#endif
+        new_args = PyTuple_GetSlice(args, 1, argc);
+
+        if (unlikely(!new_args))
+            return NULL;
+
+        self = PyTuple_GetItem(args, 0);
+        if (unlikely(!self)) {
+            Py_DECREF(new_args);
+#if PY_MAJOR_VERSION > 2
+            PyErr_Format(PyExc_TypeError,
+                         "unbound method %.200S() needs an argument",
+                         cyfunc->func_qualname);
+#else
+            // %S doesn't work in PyErr_Format on Py2 and replicating
+            // the formatting seems more trouble than it's worth
+            // (so produce a less useful error message).
+            PyErr_SetString(PyExc_TypeError,
+                            "unbound method needs an argument");
+#endif
+            return NULL;
+        }
+
+        result = __Pyx_CyFunction_CallMethod(func, self, new_args, kw);
+        Py_DECREF(new_args);
+    } else {
+        result = __Pyx_CyFunction_Call(func, args, kw);
+    }
+    return result;
+}
+
+#if CYTHON_METH_FASTCALL
+// Check that kwnames is empty (if you want to allow keyword arguments,
+// simply pass kwnames=NULL) and figure out what to do with "self".
+// Return value:
+//  1: self = args[0]
+//  0: self = cyfunc->func.m_self
+// -1: error
+static CYTHON_INLINE int __Pyx_CyFunction_Vectorcall_CheckArgs(__pyx_CyFunctionObject *cyfunc, Py_ssize_t nargs, PyObject *kwnames)
+{
+    int ret = 0;
+    if ((cyfunc->flags & __Pyx_CYFUNCTION_CCLASS) && !(cyfunc->flags & __Pyx_CYFUNCTION_STATICMETHOD)) {
+        if (unlikely(nargs < 1)) {
+            PyErr_Format(PyExc_TypeError, "%.200s() needs an argument",
+                         ((PyCFunctionObject*)cyfunc)->m_ml->ml_name);
+            return -1;
+        }
+        ret = 1;
+    }
+    if (unlikely(kwnames) && unlikely(PyTuple_GET_SIZE(kwnames))) {
+        PyErr_Format(PyExc_TypeError,
+                     "%.200s() takes no keyword arguments", ((PyCFunctionObject*)cyfunc)->m_ml->ml_name);
+        return -1;
+    }
+    return ret;
+}
+
+static PyObject * __Pyx_CyFunction_Vectorcall_NOARGS(PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
+{
+    __pyx_CyFunctionObject *cyfunc = (__pyx_CyFunctionObject *)func;
+    PyMethodDef* def = ((PyCFunctionObject*)cyfunc)->m_ml;
+#if CYTHON_BACKPORT_VECTORCALL
+    Py_ssize_t nargs = (Py_ssize_t)nargsf;
+#else
+    Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
+#endif
+    PyObject *self;
+    switch (__Pyx_CyFunction_Vectorcall_CheckArgs(cyfunc, nargs, kwnames)) {
+    case 1:
+        self = args[0];
+        args += 1;
+        nargs -= 1;
+        break;
+    case 0:
+        self = ((PyCFunctionObject*)cyfunc)->m_self;
+        break;
+    default:
+        return NULL;
+    }
+
+    if (unlikely(nargs != 0)) {
+        PyErr_Format(PyExc_TypeError,
+            "%.200s() takes no arguments (%" CYTHON_FORMAT_SSIZE_T "d given)",
+            def->ml_name, nargs);
+        return NULL;
+    }
+    return def->ml_meth(self, NULL);
+}
+
+static PyObject * __Pyx_CyFunction_Vectorcall_O(PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
+{
+    __pyx_CyFunctionObject *cyfunc = (__pyx_CyFunctionObject *)func;
+    PyMethodDef* def = ((PyCFunctionObject*)cyfunc)->m_ml;
+#if CYTHON_BACKPORT_VECTORCALL
+    Py_ssize_t nargs = (Py_ssize_t)nargsf;
+#else
+    Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
+#endif
+    PyObject *self;
+    switch (__Pyx_CyFunction_Vectorcall_CheckArgs(cyfunc, nargs, kwnames)) {
+    case 1:
+        self = args[0];
+        args += 1;
+        nargs -= 1;
+        break;
+    case 0:
+        self = ((PyCFunctionObject*)cyfunc)->m_self;
+        break;
+    default:
+        return NULL;
+    }
+
+    if (unlikely(nargs != 1)) {
+        PyErr_Format(PyExc_TypeError,
+            "%.200s() takes exactly one argument (%" CYTHON_FORMAT_SSIZE_T "d given)",
+            def->ml_name, nargs);
+        return NULL;
+    }
+    return def->ml_meth(self, args[0]);
+}
+
+static PyObject * __Pyx_CyFunction_Vectorcall_FASTCALL_KEYWORDS(PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
+{
+    __pyx_CyFunctionObject *cyfunc = (__pyx_CyFunctionObject *)func;
+    PyMethodDef* def = ((PyCFunctionObject*)cyfunc)->m_ml;
+#if CYTHON_BACKPORT_VECTORCALL
+    Py_ssize_t nargs = (Py_ssize_t)nargsf;
+#else
+    Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
+#endif
+    PyObject *self;
+    switch (__Pyx_CyFunction_Vectorcall_CheckArgs(cyfunc, nargs, NULL)) {
+    case 1:
+        self = args[0];
+        args += 1;
+        nargs -= 1;
+        break;
+    case 0:
+        self = ((PyCFunctionObject*)cyfunc)->m_self;
+        break;
+    default:
+        return NULL;
+    }
+
+    return ((__Pyx_PyCFunctionFastWithKeywords)(void(*)(void))def->ml_meth)(self, args, nargs, kwnames);
+}
+
+static PyObject * __Pyx_CyFunction_Vectorcall_FASTCALL_KEYWORDS_METHOD(PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
+{
+    __pyx_CyFunctionObject *cyfunc = (__pyx_CyFunctionObject *)func;
+    PyMethodDef* def = ((PyCFunctionObject*)cyfunc)->m_ml;
+    PyTypeObject *cls = (PyTypeObject *) __Pyx_CyFunction_GetClassObj(cyfunc);
+#if CYTHON_BACKPORT_VECTORCALL
+    Py_ssize_t nargs = (Py_ssize_t)nargsf;
+#else
+    Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
+#endif
+    PyObject *self;
+    switch (__Pyx_CyFunction_Vectorcall_CheckArgs(cyfunc, nargs, NULL)) {
+    case 1:
+        self = args[0];
+        args += 1;
+        nargs -= 1;
+        break;
+    case 0:
+        self = ((PyCFunctionObject*)cyfunc)->m_self;
+        break;
+    default:
+        return NULL;
+    }
+
+    return ((__Pyx_PyCMethod)(void(*)(void))def->ml_meth)(self, cls, args, (size_t)nargs, kwnames);
+}
+#endif
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx_CyFunctionType_slots[] = {
+    {Py_tp_dealloc, (void *)__Pyx_CyFunction_dealloc},
+    {Py_tp_repr, (void *)__Pyx_CyFunction_repr},
+    {Py_tp_call, (void *)__Pyx_CyFunction_CallAsMethod},
+    {Py_tp_traverse, (void *)__Pyx_CyFunction_traverse},
+    {Py_tp_clear, (void *)__Pyx_CyFunction_clear},
+    {Py_tp_methods, (void *)__pyx_CyFunction_methods},
+    {Py_tp_members, (void *)__pyx_CyFunction_members},
+    {Py_tp_getset, (void *)__pyx_CyFunction_getsets},
+    {Py_tp_descr_get, (void *)__Pyx_PyMethod_New},
+    {0, 0},
+};
+
+static PyType_Spec __pyx_CyFunctionType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "cython_function_or_method",
+    sizeof(__pyx_CyFunctionObject),
+    0,
+#ifdef Py_TPFLAGS_METHOD_DESCRIPTOR
+    Py_TPFLAGS_METHOD_DESCRIPTOR |
+#endif
+#if (defined(_Py_TPFLAGS_HAVE_VECTORCALL) && CYTHON_METH_FASTCALL)
+    _Py_TPFLAGS_HAVE_VECTORCALL |
+#endif
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_BASETYPE, /*tp_flags*/
+    __pyx_CyFunctionType_slots
+};
+#else /* CYTHON_USE_TYPE_SPECS */
+
+static PyTypeObject __pyx_CyFunctionType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    __PYX_TYPE_MODULE_PREFIX "cython_function_or_method",  /*tp_name*/
+    sizeof(__pyx_CyFunctionObject),   /*tp_basicsize*/
+    0,                                  /*tp_itemsize*/
+    (destructor) __Pyx_CyFunction_dealloc, /*tp_dealloc*/
+#if !CYTHON_METH_FASTCALL
+    0,                                  /*tp_print*/
+#elif CYTHON_BACKPORT_VECTORCALL
+    (printfunc)offsetof(__pyx_CyFunctionObject, func_vectorcall), /*tp_vectorcall_offset backported into tp_print*/
+#else
+    offsetof(PyCFunctionObject, vectorcall), /*tp_vectorcall_offset*/
+#endif
+    0,                                  /*tp_getattr*/
+    0,                                  /*tp_setattr*/
+#if PY_MAJOR_VERSION < 3
+    0,                                  /*tp_compare*/
+#else
+    0,                                  /*tp_as_async*/
+#endif
+    (reprfunc) __Pyx_CyFunction_repr,   /*tp_repr*/
+    0,                                  /*tp_as_number*/
+    0,                                  /*tp_as_sequence*/
+    0,                                  /*tp_as_mapping*/
+    0,                                  /*tp_hash*/
+    __Pyx_CyFunction_CallAsMethod,      /*tp_call*/
+    0,                                  /*tp_str*/
+    0,                                  /*tp_getattro*/
+    0,                                  /*tp_setattro*/
+    0,                                  /*tp_as_buffer*/
+#ifdef Py_TPFLAGS_METHOD_DESCRIPTOR
+    Py_TPFLAGS_METHOD_DESCRIPTOR |
+#endif
+#if defined(_Py_TPFLAGS_HAVE_VECTORCALL) && CYTHON_METH_FASTCALL
+    _Py_TPFLAGS_HAVE_VECTORCALL |
+#endif
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_BASETYPE, /*tp_flags*/
+    0,                                  /*tp_doc*/
+    (traverseproc) __Pyx_CyFunction_traverse,   /*tp_traverse*/
+    (inquiry) __Pyx_CyFunction_clear,   /*tp_clear*/
+    0,                                  /*tp_richcompare*/
+#if PY_VERSION_HEX < 0x030500A0
+    offsetof(__pyx_CyFunctionObject, func_weakreflist), /*tp_weaklistoffset*/
+#else
+    offsetof(PyCFunctionObject, m_weakreflist),         /*tp_weaklistoffset*/
+#endif
+    0,                                  /*tp_iter*/
+    0,                                  /*tp_iternext*/
+    __pyx_CyFunction_methods,           /*tp_methods*/
+    __pyx_CyFunction_members,           /*tp_members*/
+    __pyx_CyFunction_getsets,           /*tp_getset*/
+    0,                                  /*tp_base*/
+    0,                                  /*tp_dict*/
+    __Pyx_PyMethod_New,                 /*tp_descr_get*/
+    0,                                  /*tp_descr_set*/
+    offsetof(__pyx_CyFunctionObject, func_dict),/*tp_dictoffset*/
+    0,                                  /*tp_init*/
+    0,                                  /*tp_alloc*/
+    0,                                  /*tp_new*/
+    0,                                  /*tp_free*/
+    0,                                  /*tp_is_gc*/
+    0,                                  /*tp_bases*/
+    0,                                  /*tp_mro*/
+    0,                                  /*tp_cache*/
+    0,                                  /*tp_subclasses*/
+    0,                                  /*tp_weaklist*/
+    0,                                  /*tp_del*/
+    0,                                  /*tp_version_tag*/
+#if PY_VERSION_HEX >= 0x030400a1
+    0,                                  /*tp_finalize*/
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                  /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                  /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                  /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif  /* CYTHON_USE_TYPE_SPECS */
+
+
+static int __pyx_CyFunction_init(PyObject *module) {
+#if CYTHON_USE_TYPE_SPECS
+    __pyx_CyFunctionType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx_CyFunctionType_spec, NULL);
+#else
+    CYTHON_UNUSED_VAR(module);
+    __pyx_CyFunctionType = __Pyx_FetchCommonType(&__pyx_CyFunctionType_type);
+#endif
+    if (unlikely(__pyx_CyFunctionType == NULL)) {
+        return -1;
+    }
+    return 0;
+}
+
+static CYTHON_INLINE void *__Pyx_CyFunction_InitDefaults(PyObject *func, size_t size, int pyobjects) {
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+
+    m->defaults = PyObject_Malloc(size);
+    if (unlikely(!m->defaults))
+        return PyErr_NoMemory();
+    memset(m->defaults, 0, size);
+    m->defaults_pyobjects = pyobjects;
+    m->defaults_size = size;
+    return m->defaults;
+}
+
+static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsTuple(PyObject *func, PyObject *tuple) {
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    m->defaults_tuple = tuple;
+    Py_INCREF(tuple);
+}
+
+static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsKwDict(PyObject *func, PyObject *dict) {
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    m->defaults_kwdict = dict;
+    Py_INCREF(dict);
+}
+
+static CYTHON_INLINE void __Pyx_CyFunction_SetAnnotationsDict(PyObject *func, PyObject *dict) {
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    m->func_annotations = dict;
+    Py_INCREF(dict);
+}
+
+
+//////////////////// CythonFunction.proto ////////////////////
+
+static PyObject *__Pyx_CyFunction_New(PyMethodDef *ml,
+                                      int flags, PyObject* qualname,
+                                      PyObject *closure,
+                                      PyObject *module, PyObject *globals,
+                                      PyObject* code);
+
+//////////////////// CythonFunction ////////////////////
+//@requires: CythonFunctionShared
+
+static PyObject *__Pyx_CyFunction_New(PyMethodDef *ml, int flags, PyObject* qualname,
+                                      PyObject *closure, PyObject *module, PyObject* globals, PyObject* code) {
+    PyObject *op = __Pyx_CyFunction_Init(
+        PyObject_GC_New(__pyx_CyFunctionObject, __pyx_CyFunctionType),
+        ml, flags, qualname, closure, module, globals, code
+    );
+    if (likely(op)) {
+        PyObject_GC_Track(op);
+    }
+    return op;
+}
+
+//////////////////// CyFunctionClassCell.proto ////////////////////
+static int __Pyx_CyFunction_InitClassCell(PyObject *cyfunctions, PyObject *classobj);/*proto*/
+
+//////////////////// CyFunctionClassCell ////////////////////
+//@requires: CythonFunctionShared
+
+static int __Pyx_CyFunction_InitClassCell(PyObject *cyfunctions, PyObject *classobj) {
+    Py_ssize_t i, count = PyList_GET_SIZE(cyfunctions);
+
+    for (i = 0; i < count; i++) {
+        __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *)
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+            PyList_GET_ITEM(cyfunctions, i);
+#else
+            PySequence_ITEM(cyfunctions, i);
+        if (unlikely(!m))
+            return -1;
+#endif
+        __Pyx_CyFunction_SetClassObj(m, classobj);
+#if !(CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS)
+        Py_DECREF((PyObject*)m);
+#endif
+    }
+    return 0;
+}
+
+
+//////////////////// FusedFunction.proto ////////////////////
+
+typedef struct {
+    __pyx_CyFunctionObject func;
+    PyObject *__signatures__;
+    PyObject *self;
+} __pyx_FusedFunctionObject;
+
+static PyObject *__pyx_FusedFunction_New(PyMethodDef *ml, int flags,
+                                         PyObject *qualname, PyObject *closure,
+                                         PyObject *module, PyObject *globals,
+                                         PyObject *code);
+
+static int __pyx_FusedFunction_clear(__pyx_FusedFunctionObject *self);
+static int __pyx_FusedFunction_init(PyObject *module);
+
+#define __Pyx_FusedFunction_USED
+
+//////////////////// FusedFunction ////////////////////
+//@requires: CythonFunctionShared
+
+static PyObject *
+__pyx_FusedFunction_New(PyMethodDef *ml, int flags,
+                        PyObject *qualname, PyObject *closure,
+                        PyObject *module, PyObject *globals,
+                        PyObject *code)
+{
+    PyObject *op = __Pyx_CyFunction_Init(
+        // __pyx_CyFunctionObject is correct below since that's the cast that we want.
+        PyObject_GC_New(__pyx_CyFunctionObject, __pyx_FusedFunctionType),
+        ml, flags, qualname, closure, module, globals, code
+    );
+    if (likely(op)) {
+        __pyx_FusedFunctionObject *fusedfunc = (__pyx_FusedFunctionObject *) op;
+        fusedfunc->__signatures__ = NULL;
+        fusedfunc->self = NULL;
+        PyObject_GC_Track(op);
+    }
+    return op;
+}
+
+static void
+__pyx_FusedFunction_dealloc(__pyx_FusedFunctionObject *self)
+{
+    PyObject_GC_UnTrack(self);
+    Py_CLEAR(self->self);
+    Py_CLEAR(self->__signatures__);
+    __Pyx__CyFunction_dealloc((__pyx_CyFunctionObject *) self);
+}
+
+static int
+__pyx_FusedFunction_traverse(__pyx_FusedFunctionObject *self,
+                             visitproc visit,
+                             void *arg)
+{
+    Py_VISIT(self->self);
+    Py_VISIT(self->__signatures__);
+    return __Pyx_CyFunction_traverse((__pyx_CyFunctionObject *) self, visit, arg);
+}
+
+static int
+__pyx_FusedFunction_clear(__pyx_FusedFunctionObject *self)
+{
+    Py_CLEAR(self->self);
+    Py_CLEAR(self->__signatures__);
+    return __Pyx_CyFunction_clear((__pyx_CyFunctionObject *) self);
+}
+
+
+static PyObject *
+__pyx_FusedFunction_descr_get(PyObject *self, PyObject *obj, PyObject *type)
+{
+    __pyx_FusedFunctionObject *func, *meth;
+
+    func = (__pyx_FusedFunctionObject *) self;
+
+    if (func->self || func->func.flags & __Pyx_CYFUNCTION_STATICMETHOD) {
+        // Do not allow rebinding and don't do anything for static methods
+        Py_INCREF(self);
+        return self;
+    }
+
+    if (obj == Py_None)
+        obj = NULL;
+
+    if (func->func.flags & __Pyx_CYFUNCTION_CLASSMETHOD)
+        obj = type;
+
+    if (obj == NULL) {
+        // We aren't actually binding to anything, save the effort of rebinding
+        Py_INCREF(self);
+        return self;
+    }
+
+    meth = (__pyx_FusedFunctionObject *) __pyx_FusedFunction_New(
+                    ((PyCFunctionObject *) func)->m_ml,
+                    ((__pyx_CyFunctionObject *) func)->flags,
+                    ((__pyx_CyFunctionObject *) func)->func_qualname,
+                    ((__pyx_CyFunctionObject *) func)->func_closure,
+                    ((PyCFunctionObject *) func)->m_module,
+                    ((__pyx_CyFunctionObject *) func)->func_globals,
+                    ((__pyx_CyFunctionObject *) func)->func_code);
+    if (unlikely(!meth))
+        return NULL;
+
+    // defaults needs copying fully rather than just copying the pointer
+    // since otherwise it will be freed on destruction of meth despite
+    // belonging to func rather than meth
+    if (func->func.defaults) {
+        PyObject **pydefaults;
+        int i;
+
+        if (unlikely(!__Pyx_CyFunction_InitDefaults(
+                (PyObject*)meth,
+                func->func.defaults_size,
+                func->func.defaults_pyobjects))) {
+            Py_XDECREF((PyObject*)meth);
+            return NULL;
+        }
+        memcpy(meth->func.defaults, func->func.defaults, func->func.defaults_size);
+
+        pydefaults = __Pyx_CyFunction_Defaults(PyObject *, meth);
+        for (i = 0; i < meth->func.defaults_pyobjects; i++)
+            Py_XINCREF(pydefaults[i]);
+    }
+
+    __Pyx_CyFunction_SetClassObj(meth, __Pyx_CyFunction_GetClassObj(func));
+
+    Py_XINCREF(func->__signatures__);
+    meth->__signatures__ = func->__signatures__;
+
+    Py_XINCREF(func->func.defaults_tuple);
+    meth->func.defaults_tuple = func->func.defaults_tuple;
+
+    Py_XINCREF(obj);
+    meth->self = obj;
+
+    return (PyObject *) meth;
+}
+
+static PyObject *
+_obj_to_string(PyObject *obj)
+{
+    if (PyUnicode_CheckExact(obj))
+        return __Pyx_NewRef(obj);
+#if PY_MAJOR_VERSION == 2
+    else if (PyString_Check(obj))
+        return PyUnicode_FromEncodedObject(obj, NULL, "strict");
+#endif
+    else if (PyType_Check(obj))
+        return PyObject_GetAttr(obj, PYIDENT("__name__"));
+    else
+        return PyObject_Unicode(obj);
+}
+
+static PyObject *
+__pyx_FusedFunction_getitem(__pyx_FusedFunctionObject *self, PyObject *idx)
+{
+    PyObject *signature = NULL;
+    PyObject *unbound_result_func;
+    PyObject *result_func = NULL;
+
+    if (unlikely(self->__signatures__ == NULL)) {
+        PyErr_SetString(PyExc_TypeError, "Function is not fused");
+        return NULL;
+    }
+
+    if (PyTuple_Check(idx)) {
+        Py_ssize_t n = PyTuple_GET_SIZE(idx);
+        PyObject *list = PyList_New(n);
+        int i;
+
+        if (unlikely(!list))
+            return NULL;
+
+        for (i = 0; i < n; i++) {
+            PyObject *string;
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+            PyObject *item = PyTuple_GET_ITEM(idx, i);
+#else
+            PyObject *item = PySequence_ITEM(idx, i);  if (unlikely(!item)) goto __pyx_err;
+#endif
+            string = _obj_to_string(item);
+#if !(CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS)
+            Py_DECREF(item);
+#endif
+            if (unlikely(!string)) goto __pyx_err;
+            PyList_SET_ITEM(list, i, string);
+        }
+
+        signature = PyUnicode_Join(PYUNICODE("|"), list);
+__pyx_err:;
+        Py_DECREF(list);
+    } else {
+        signature = _obj_to_string(idx);
+    }
+
+    if (unlikely(!signature))
+        return NULL;
+
+    unbound_result_func = PyObject_GetItem(self->__signatures__, signature);
+
+    if (likely(unbound_result_func)) {
+        if (self->self) {
+            __pyx_FusedFunctionObject *unbound = (__pyx_FusedFunctionObject *) unbound_result_func;
+
+            // TODO: move this to InitClassCell
+            __Pyx_CyFunction_SetClassObj(unbound, __Pyx_CyFunction_GetClassObj(self));
+
+            result_func = __pyx_FusedFunction_descr_get(unbound_result_func,
+                                                        self->self, self->self);
+        } else {
+            result_func = unbound_result_func;
+            Py_INCREF(result_func);
+        }
+    }
+
+    Py_DECREF(signature);
+    Py_XDECREF(unbound_result_func);
+
+    return result_func;
+}
+
+static PyObject *
+__pyx_FusedFunction_callfunction(PyObject *func, PyObject *args, PyObject *kw)
+{
+     __pyx_CyFunctionObject *cyfunc = (__pyx_CyFunctionObject *) func;
+    int static_specialized = (cyfunc->flags & __Pyx_CYFUNCTION_STATICMETHOD &&
+                              !((__pyx_FusedFunctionObject *) func)->__signatures__);
+
+    if ((cyfunc->flags & __Pyx_CYFUNCTION_CCLASS) && !static_specialized) {
+        return __Pyx_CyFunction_CallAsMethod(func, args, kw);
+    } else {
+        return __Pyx_CyFunction_Call(func, args, kw);
+    }
+}
+
+// Note: the 'self' from method binding is passed in in the args tuple,
+//       whereas PyCFunctionObject's m_self is passed in as the first
+//       argument to the C function. For extension methods we need
+//       to pass 'self' as 'm_self' and not as the first element of the
+//       args tuple.
+
+static PyObject *
+__pyx_FusedFunction_call(PyObject *func, PyObject *args, PyObject *kw)
+{
+    __pyx_FusedFunctionObject *binding_func = (__pyx_FusedFunctionObject *) func;
+    Py_ssize_t argc = PyTuple_GET_SIZE(args);
+    PyObject *new_args = NULL;
+    __pyx_FusedFunctionObject *new_func = NULL;
+    PyObject *result = NULL;
+    int is_staticmethod = binding_func->func.flags & __Pyx_CYFUNCTION_STATICMETHOD;
+
+    if (binding_func->self) {
+        // Bound method call, put 'self' in the args tuple
+        PyObject *self;
+        Py_ssize_t i;
+        new_args = PyTuple_New(argc + 1);
+        if (unlikely(!new_args))
+            return NULL;
+
+        self = binding_func->self;
+
+        Py_INCREF(self);
+        PyTuple_SET_ITEM(new_args, 0, self);
+        self = NULL;
+
+        for (i = 0; i < argc; i++) {
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+            PyObject *item = PyTuple_GET_ITEM(args, i);
+            Py_INCREF(item);
+#else
+            PyObject *item = PySequence_ITEM(args, i);  if (unlikely(!item)) goto bad;
+#endif
+            PyTuple_SET_ITEM(new_args, i + 1, item);
+        }
+
+        args = new_args;
+    }
+
+    if (binding_func->__signatures__) {
+        PyObject *tup;
+        if (is_staticmethod && binding_func->func.flags & __Pyx_CYFUNCTION_CCLASS) {
+            // FIXME: this seems wrong, but we must currently pass the signatures dict as 'self' argument
+            tup = PyTuple_Pack(3, args,
+                               kw == NULL ? Py_None : kw,
+                               binding_func->func.defaults_tuple);
+            if (unlikely(!tup)) goto bad;
+            new_func = (__pyx_FusedFunctionObject *) __Pyx_CyFunction_CallMethod(
+                func, binding_func->__signatures__, tup, NULL);
+        } else {
+            tup = PyTuple_Pack(4, binding_func->__signatures__, args,
+                               kw == NULL ? Py_None : kw,
+                               binding_func->func.defaults_tuple);
+            if (unlikely(!tup)) goto bad;
+            new_func = (__pyx_FusedFunctionObject *) __pyx_FusedFunction_callfunction(func, tup, NULL);
+        }
+        Py_DECREF(tup);
+
+        if (unlikely(!new_func))
+            goto bad;
+
+        __Pyx_CyFunction_SetClassObj(new_func, __Pyx_CyFunction_GetClassObj(binding_func));
+
+        func = (PyObject *) new_func;
+    }
+
+    result = __pyx_FusedFunction_callfunction(func, args, kw);
+bad:
+    Py_XDECREF(new_args);
+    Py_XDECREF((PyObject *) new_func);
+    return result;
+}
+
+static PyMemberDef __pyx_FusedFunction_members[] = {
+    {(char *) "__signatures__",
+     T_OBJECT,
+     offsetof(__pyx_FusedFunctionObject, __signatures__),
+     READONLY,
+     0},
+    {(char *) "__self__", T_OBJECT_EX, offsetof(__pyx_FusedFunctionObject, self), READONLY, 0},
+    {0, 0, 0, 0, 0},
+};
+
+static PyGetSetDef __pyx_FusedFunction_getsets[] = {
+    // __doc__ is None for the fused function type, but we need it to be
+    // a descriptor for the instance's __doc__, so rebuild the descriptor in our subclass
+    // (all other descriptors are inherited)
+    {(char *) "__doc__",  (getter)__Pyx_CyFunction_get_doc, (setter)__Pyx_CyFunction_set_doc, 0, 0},
+    {0, 0, 0, 0, 0}
+};
+
+#if CYTHON_USE_TYPE_SPECS
+static PyType_Slot __pyx_FusedFunctionType_slots[] = {
+    {Py_tp_dealloc, (void *)__pyx_FusedFunction_dealloc},
+    {Py_tp_call, (void *)__pyx_FusedFunction_call},
+    {Py_tp_traverse, (void *)__pyx_FusedFunction_traverse},
+    {Py_tp_clear, (void *)__pyx_FusedFunction_clear},
+    {Py_tp_members, (void *)__pyx_FusedFunction_members},
+    {Py_tp_getset, (void *)__pyx_FusedFunction_getsets},
+    {Py_tp_descr_get, (void *)__pyx_FusedFunction_descr_get},
+    {Py_mp_subscript, (void *)__pyx_FusedFunction_getitem},
+    {0, 0},
+};
+
+static PyType_Spec __pyx_FusedFunctionType_spec = {
+    __PYX_TYPE_MODULE_PREFIX "fused_cython_function",
+    sizeof(__pyx_FusedFunctionObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_BASETYPE, /*tp_flags*/
+    __pyx_FusedFunctionType_slots
+};
+
+#else  /* !CYTHON_USE_TYPE_SPECS */
+
+static PyMappingMethods __pyx_FusedFunction_mapping_methods = {
+    0,
+    (binaryfunc) __pyx_FusedFunction_getitem,
+    0,
+};
+
+static PyTypeObject __pyx_FusedFunctionType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    __PYX_TYPE_MODULE_PREFIX "fused_cython_function",  /*tp_name*/
+    sizeof(__pyx_FusedFunctionObject), /*tp_basicsize*/
+    0,                                  /*tp_itemsize*/
+    (destructor) __pyx_FusedFunction_dealloc, /*tp_dealloc*/
+    0,                                  /*tp_print*/
+    0,                                  /*tp_getattr*/
+    0,                                  /*tp_setattr*/
+#if PY_MAJOR_VERSION < 3
+    0,                                  /*tp_compare*/
+#else
+    0,                                  /*tp_as_async*/
+#endif
+    0,                                  /*tp_repr*/
+    0,                                  /*tp_as_number*/
+    0,                                  /*tp_as_sequence*/
+    &__pyx_FusedFunction_mapping_methods, /*tp_as_mapping*/
+    0,                                  /*tp_hash*/
+    (ternaryfunc) __pyx_FusedFunction_call, /*tp_call*/
+    0,                                  /*tp_str*/
+    0,                                  /*tp_getattro*/
+    0,                                  /*tp_setattro*/
+    0,                                  /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_BASETYPE, /*tp_flags*/
+    0,                                  /*tp_doc*/
+    (traverseproc) __pyx_FusedFunction_traverse,   /*tp_traverse*/
+    (inquiry) __pyx_FusedFunction_clear,/*tp_clear*/
+    0,                                  /*tp_richcompare*/
+    0,                                  /*tp_weaklistoffset*/
+    0,                                  /*tp_iter*/
+    0,                                  /*tp_iternext*/
+    0,                                  /*tp_methods*/
+    __pyx_FusedFunction_members,        /*tp_members*/
+    __pyx_FusedFunction_getsets,           /*tp_getset*/
+    // NOTE: tp_base may be changed later during module initialisation when importing CyFunction across modules.
+    &__pyx_CyFunctionType_type,         /*tp_base*/
+    0,                                  /*tp_dict*/
+    __pyx_FusedFunction_descr_get,      /*tp_descr_get*/
+    0,                                  /*tp_descr_set*/
+    0,                                  /*tp_dictoffset*/
+    0,                                  /*tp_init*/
+    0,                                  /*tp_alloc*/
+    0,                                  /*tp_new*/
+    0,                                  /*tp_free*/
+    0,                                  /*tp_is_gc*/
+    0,                                  /*tp_bases*/
+    0,                                  /*tp_mro*/
+    0,                                  /*tp_cache*/
+    0,                                  /*tp_subclasses*/
+    0,                                  /*tp_weaklist*/
+    0,                                  /*tp_del*/
+    0,                                  /*tp_version_tag*/
+#if PY_VERSION_HEX >= 0x030400a1
+    0,                                  /*tp_finalize*/
+#endif
+#if PY_VERSION_HEX >= 0x030800b1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07030800)
+    0,                                  /*tp_vectorcall*/
+#endif
+#if __PYX_NEED_TP_PRINT_SLOT
+    0,                                  /*tp_print*/
+#endif
+#if PY_VERSION_HEX >= 0x030C0000
+    0,                                  /*tp_watched*/
+#endif
+#if PY_VERSION_HEX >= 0x030d00A4
+    0,                                          /*tp_versions_used*/
+#endif
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX >= 0x03090000 && PY_VERSION_HEX < 0x030a0000
+    0,                                          /*tp_pypy_flags*/
+#endif
+};
+#endif
+
+static int __pyx_FusedFunction_init(PyObject *module) {
+#if CYTHON_USE_TYPE_SPECS
+    PyObject *bases = PyTuple_Pack(1, __pyx_CyFunctionType);
+    if (unlikely(!bases)) {
+        return -1;
+    }
+    __pyx_FusedFunctionType = __Pyx_FetchCommonTypeFromSpec(module, &__pyx_FusedFunctionType_spec, bases);
+    Py_DECREF(bases);
+#else
+    CYTHON_UNUSED_VAR(module);
+    // Set base from __Pyx_FetchCommonTypeFromSpec, in case it's different from the local static value.
+    __pyx_FusedFunctionType_type.tp_base = __pyx_CyFunctionType;
+    __pyx_FusedFunctionType = __Pyx_FetchCommonType(&__pyx_FusedFunctionType_type);
+#endif
+    if (unlikely(__pyx_FusedFunctionType == NULL)) {
+        return -1;
+    }
+    return 0;
+}
+
+//////////////////// ClassMethod.proto ////////////////////
+
+#include "descrobject.h"
+CYTHON_UNUSED static PyObject* __Pyx_Method_ClassMethod(PyObject *method); /*proto*/
+
+//////////////////// ClassMethod ////////////////////
+
+static PyObject* __Pyx_Method_ClassMethod(PyObject *method) {
+#if CYTHON_COMPILING_IN_PYPY && PYPY_VERSION_NUM <= 0x05080000
+    if (PyObject_TypeCheck(method, &PyWrapperDescr_Type)) {
+        // cdef classes
+        return PyClassMethod_New(method);
+    }
+#else
+#if CYTHON_COMPILING_IN_PYPY
+    // special C-API function only in PyPy >= 5.9
+    if (PyMethodDescr_Check(method))
+#else
+    #if PY_MAJOR_VERSION == 2
+    // PyMethodDescr_Type is not exposed in the CPython C-API in Py2.
+    static PyTypeObject *methoddescr_type = NULL;
+    if (unlikely(methoddescr_type == NULL)) {
+       PyObject *meth = PyObject_GetAttrString((PyObject*)&PyList_Type, "append");
+       if (unlikely(!meth)) return NULL;
+       methoddescr_type = Py_TYPE(meth);
+       Py_DECREF(meth);
+    }
+    #else
+    PyTypeObject *methoddescr_type = &PyMethodDescr_Type;
+    #endif
+    if (__Pyx_TypeCheck(method, methoddescr_type))
+#endif
+    {
+        // cdef classes
+        PyMethodDescrObject *descr = (PyMethodDescrObject *)method;
+        #if PY_VERSION_HEX < 0x03020000
+        PyTypeObject *d_type = descr->d_type;
+        #else
+        PyTypeObject *d_type = descr->d_common.d_type;
+        #endif
+        return PyDescr_NewClassMethod(d_type, descr->d_method);
+    }
+#endif
+    else if (PyMethod_Check(method)) {
+        // python classes
+        return PyClassMethod_New(PyMethod_GET_FUNCTION(method));
+    }
+    else {
+        return PyClassMethod_New(method);
+    }
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/Dataclasses.c b/contrib/tools/cython_py2/Cython/Utility/Dataclasses.c
new file mode 100644
index 00000000000..0b69049ab22
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Dataclasses.c
@@ -0,0 +1,188 @@
+///////////////////// ModuleLoader.proto //////////////////////////
+
+static PyObject* __Pyx_LoadInternalModule(const char* name, const char* fallback_code); /* proto */
+
+//////////////////// ModuleLoader ///////////////////////
+//@requires: CommonStructures.c::FetchSharedCythonModule
+
+static PyObject* __Pyx_LoadInternalModule(const char* name, const char* fallback_code) {
+    // We want to be able to use the contents of the standard library dataclasses module where available.
+    // If those objects aren't available (due to Python version) then a simple fallback is substituted
+    // instead, which largely just fails with a not-implemented error.
+    //
+    // The fallbacks are placed in the "shared abi module" as a convenient internal place to
+    // store them
+
+    PyObject *shared_abi_module = 0, *module = 0;
+#if __PYX_LIMITED_VERSION_HEX >= 0x030d00A1
+    PyObject *result;
+#endif
+
+    shared_abi_module = __Pyx_FetchSharedCythonABIModule();
+    if (!shared_abi_module) return NULL;
+
+#if __PYX_LIMITED_VERSION_HEX >= 0x030d00A1
+     if (PyObject_GetOptionalAttrString(shared_abi_module, name, &result) != 0) {
+        Py_DECREF(shared_abi_module);
+        return result;
+     }
+#else
+    if (PyObject_HasAttrString(shared_abi_module, name)) {
+        PyObject* result = PyObject_GetAttrString(shared_abi_module, name);
+        Py_DECREF(shared_abi_module);
+        return result;
+    }
+#endif
+
+    // the best and simplest case is simply to defer to the standard library (if available)
+    module = PyImport_ImportModule(name);
+    if (!module) {
+        PyObject *localDict, *runValue, *builtins, *modulename;
+        if (!PyErr_ExceptionMatches(PyExc_ImportError)) goto bad;
+        PyErr_Clear();  /* this is reasonably likely (especially on older versions of Python) */
+#if PY_MAJOR_VERSION < 3
+        modulename = PyBytes_FromFormat("_cython_" CYTHON_ABI ".%s", name);
+#else
+        modulename = PyUnicode_FromFormat("_cython_" CYTHON_ABI ".%s", name);
+#endif
+        if (!modulename) goto bad;
+#if PY_MAJOR_VERSION >= 3 && CYTHON_COMPILING_IN_CPYTHON
+        module = PyImport_AddModuleObject(modulename);  /* borrowed */
+#else
+        module = PyImport_AddModule(PyBytes_AsString(modulename));  /* borrowed */
+#endif
+        Py_DECREF(modulename);
+        if (!module) goto bad;
+        Py_INCREF(module);
+        if (PyObject_SetAttrString(shared_abi_module, name, module) < 0) goto bad;
+        localDict = PyModule_GetDict(module);  /* borrowed */
+        if (!localDict) goto bad;
+        builtins = PyEval_GetBuiltins();  /* borrowed */
+        if (!builtins) goto bad;
+        if (PyDict_SetItemString(localDict, "__builtins__", builtins) <0) goto bad;
+
+        runValue = PyRun_String(fallback_code, Py_file_input, localDict, localDict);
+        if (!runValue) goto bad;
+        Py_DECREF(runValue);
+    }
+    goto shared_cleanup;
+
+    bad:
+        Py_CLEAR(module);
+    shared_cleanup:
+        Py_XDECREF(shared_abi_module);
+    return module;
+}
+
+///////////////////// SpecificModuleLoader.proto //////////////////////
+//@substitute: tempita
+
+static PyObject* __Pyx_Load_{{cname}}_Module(void); /* proto */
+
+
+//////////////////// SpecificModuleLoader ///////////////////////
+//@requires: ModuleLoader
+
+static PyObject* __Pyx_Load_{{cname}}_Module(void) {
+    return __Pyx_LoadInternalModule("{{cname}}", {{py_code}});
+}
+
+//////////////////// DataclassesCallHelper.proto ////////////////////////
+
+static PyObject* __Pyx_DataclassesCallHelper(PyObject *callable, PyObject *kwds); /* proto */
+
+//////////////////// DataclassesCallHelper ////////////////////////
+//@substitute: naming
+
+// The signature of a few of the dataclasses module functions has
+// been expanded over the years. Cython always passes the full set
+// of arguments from the most recent version we know of, so needs
+// to remove any arguments that don't exist on earlier versions.
+
+#if PY_MAJOR_VERSION >= 3
+static int __Pyx_DataclassesCallHelper_FilterToDict(PyObject *callable, PyObject *kwds, PyObject *new_kwds, PyObject *args_list, int is_kwonly) {
+    Py_ssize_t size, i;
+    size = PySequence_Size(args_list);
+    if (size == -1) return -1;
+
+    for (i=0; i<size; ++i) {
+        PyObject *key, *value;
+        int setitem_result;
+        key = PySequence_GetItem(args_list, i);
+        if (!key) return -1;
+
+        if (PyUnicode_Check(key) && (
+                PyUnicode_CompareWithASCIIString(key, "self") == 0 ||
+                // namedtuple constructor in fallback code
+                PyUnicode_CompareWithASCIIString(key, "_cls") == 0)) {
+            Py_DECREF(key);
+            continue;
+        }
+
+        value = PyDict_GetItem(kwds, key);
+        if (!value) {
+            if (is_kwonly) {
+                Py_DECREF(key);
+                continue;
+            } else {
+                // The most likely reason for this is that Cython
+                // hasn't kept up to date with the Python dataclasses module.
+                // To be nice to our users, try not to fail, but ask them
+                // to report a bug so we can keep up to date.
+                value = Py_None;
+                if (PyErr_WarnFormat(
+                        PyExc_RuntimeWarning, 1,
+                        "Argument %S not passed to %R. This is likely a bug in Cython so please report it.",
+                        key, callable) == -1) {
+                    Py_DECREF(key);
+                    return -1;
+                }
+            }
+        }
+        Py_INCREF(value);
+        setitem_result = PyDict_SetItem(new_kwds, key, value);
+        Py_DECREF(key);
+        Py_DECREF(value);
+        if (setitem_result == -1) return -1;
+    }
+    return 0;
+}
+#endif
+
+static PyObject* __Pyx_DataclassesCallHelper(PyObject *callable, PyObject *kwds) {
+#if PY_MAJOR_VERSION < 3
+    // We're falling back to our full replacement anyway
+    return PyObject_Call(callable, $empty_tuple, kwds);
+#else
+    PyObject *new_kwds=NULL, *result=NULL;
+    PyObject *inspect;
+    PyObject *args_list=NULL, *kwonly_args_list=NULL, *getfullargspec_result=NULL;
+
+    // Going via inspect to work out what arguments to pass is unlikely to be the
+    // fastest thing ever. However, it is compatible, and only happens once
+    // at module-import time.
+    inspect = PyImport_ImportModule("inspect");
+    if (!inspect) goto bad;
+    getfullargspec_result = PyObject_CallMethodObjArgs(inspect, PYUNICODE("getfullargspec"), callable, NULL);
+    Py_DECREF(inspect);
+    if (!getfullargspec_result) goto bad;
+    args_list = PyObject_GetAttrString(getfullargspec_result, "args");
+    if (!args_list) goto bad;
+    kwonly_args_list = PyObject_GetAttrString(getfullargspec_result, "kwonlyargs");
+    if (!kwonly_args_list) goto bad;
+
+    new_kwds = PyDict_New();
+    if (!new_kwds) goto bad;
+
+    // copy over only those arguments that are in the specification
+    if (__Pyx_DataclassesCallHelper_FilterToDict(callable, kwds, new_kwds, args_list, 0) == -1) goto bad;
+    if (__Pyx_DataclassesCallHelper_FilterToDict(callable, kwds, new_kwds, kwonly_args_list, 1) == -1) goto bad;
+    result = PyObject_Call(callable, $empty_tuple, new_kwds);
+bad:
+    Py_XDECREF(getfullargspec_result);
+    Py_XDECREF(args_list);
+    Py_XDECREF(kwonly_args_list);
+    Py_XDECREF(new_kwds);
+    return result;
+#endif
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/Embed.c b/contrib/tools/cython_py2/Cython/Utility/Embed.c
new file mode 100644
index 00000000000..4c335da848a
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Embed.c
@@ -0,0 +1,261 @@
+//////////////////// MainFunction ////////////////////
+
+#ifdef __FreeBSD__
+#include <floatingpoint.h>
+#endif
+
+#if PY_MAJOR_VERSION < 3
+void Py_InitArgcArgv(int argc, char **argv);
+
+int %(main_method)s(int argc, char** argv)
+#elif defined(_WIN32) || defined(WIN32) || defined(MS_WINDOWS)
+int %(wmain_method)s(int argc, wchar_t **argv)
+#else
+static int __Pyx_main(int argc, wchar_t **argv)
+#endif
+{
+    /* 754 requires that FP exceptions run in "no stop" mode by default,
+     * and until C vendors implement C99's ways to control FP exceptions,
+     * Python requires non-stop mode.  Alas, some platforms enable FP
+     * exceptions by default.  Here we disable them.
+     */
+#ifdef __FreeBSD__
+    fp_except_t m;
+
+    m = fpgetmask();
+    fpsetmask(m & ~FP_X_OFL);
+#endif
+#if PY_MAJOR_VERSION < 3
+    if (argc && argv)
+        Py_InitArgcArgv(argc, argv);
+#endif
+#if PY_VERSION_HEX < 0x03080000
+    if (argc && argv)
+        Py_SetProgramName(argv[0]);
+#endif
+
+    #if PY_MAJOR_VERSION < 3
+    if (PyImport_AppendInittab("%(module_name)s", init%(module_name)s) < 0) return 1;
+    #else
+    if (PyImport_AppendInittab("%(module_name)s", PyInit_%(module_name)s) < 0) return 1;
+    #endif
+
+#if PY_VERSION_HEX < 0x03080000
+    Py_Initialize();
+    if (argc && argv)
+        PySys_SetArgv(argc, argv);
+#else
+    {
+        PyStatus status;
+
+        PyConfig config;
+        PyConfig_InitPythonConfig(&config);
+        // Disable parsing command line arguments
+        config.parse_argv = 0;
+
+        if (argc && argv) {
+            status = PyConfig_SetString(&config, &config.program_name, argv[0]);
+            if (PyStatus_Exception(status)) {
+                PyConfig_Clear(&config);
+                return 1;
+            }
+
+            status = PyConfig_SetArgv(&config, argc, argv);
+            if (PyStatus_Exception(status)) {
+                PyConfig_Clear(&config);
+                return 1;
+            }
+        }
+
+        status = Py_InitializeFromConfig(&config);
+        if (PyStatus_Exception(status)) {
+            PyConfig_Clear(&config);
+            return 1;
+        }
+
+        PyConfig_Clear(&config);
+    }
+#endif
+
+    { /* init module '%(module_name)s' as '__main__' */
+      PyObject* m = NULL;
+      %(module_is_main)s = 1;
+      m = PyImport_ImportModule("%(module_name)s");
+
+      if (!m && PyErr_Occurred()) {
+          PyErr_Print(); /* This exits with the right code if SystemExit. */
+          #if PY_MAJOR_VERSION < 3
+          if (Py_FlushLine()) PyErr_Clear();
+          #endif
+          return 1;
+      }
+      Py_XDECREF(m);
+    }
+#if PY_VERSION_HEX < 0x03060000
+    Py_Finalize();
+#else
+    if (Py_FinalizeEx() < 0)
+        return 2;
+#endif
+    return 0;
+}
+
+
+#if PY_MAJOR_VERSION >= 3 && !defined(_WIN32) && !defined(WIN32) && !defined(MS_WINDOWS)
+#include <locale.h>
+
+#if PY_VERSION_HEX < 0x03050000
+
+static wchar_t*
+__Pyx_char2wchar(char* arg)
+{
+    wchar_t *res;
+#ifdef HAVE_BROKEN_MBSTOWCS
+    /* Some platforms have a broken implementation of
+     * mbstowcs which does not count the characters that
+     * would result from conversion.  Use an upper bound.
+     */
+    size_t argsize = strlen(arg);
+#else
+    size_t argsize = mbstowcs(NULL, arg, 0);
+#endif
+    size_t count;
+    unsigned char *in;
+    wchar_t *out;
+#ifdef HAVE_MBRTOWC
+    mbstate_t mbs;
+#endif
+    if (argsize != (size_t)-1) {
+        res = (wchar_t *)malloc((argsize+1)*sizeof(wchar_t));
+        if (!res)
+            goto oom;
+        count = mbstowcs(res, arg, argsize+1);
+        if (count != (size_t)-1) {
+            wchar_t *tmp;
+            /* Only use the result if it contains no
+               surrogate characters. */
+            for (tmp = res; *tmp != 0 &&
+                     (*tmp < 0xd800 || *tmp > 0xdfff); tmp++)
+                ;
+            if (*tmp == 0)
+                return res;
+        }
+        free(res);
+    }
+    /* Conversion failed. Fall back to escaping with surrogateescape. */
+#ifdef HAVE_MBRTOWC
+    /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
+
+    /* Overallocate; as multi-byte characters are in the argument, the
+       actual output could use less memory. */
+    argsize = strlen(arg) + 1;
+    res = (wchar_t *)malloc(argsize*sizeof(wchar_t));
+    if (!res) goto oom;
+    in = (unsigned char*)arg;
+    out = res;
+    memset(&mbs, 0, sizeof mbs);
+    while (argsize) {
+        size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
+        if (converted == 0)
+            /* Reached end of string; null char stored. */
+            break;
+        if (converted == (size_t)-2) {
+            /* Incomplete character. This should never happen,
+               since we provide everything that we have -
+               unless there is a bug in the C library, or I
+               misunderstood how mbrtowc works. */
+            fprintf(stderr, "unexpected mbrtowc result -2\\n");
+            free(res);
+            return NULL;
+        }
+        if (converted == (size_t)-1) {
+            /* Conversion error. Escape as UTF-8b, and start over
+               in the initial shift state. */
+            *out++ = 0xdc00 + *in++;
+            argsize--;
+            memset(&mbs, 0, sizeof mbs);
+            continue;
+        }
+        if (*out >= 0xd800 && *out <= 0xdfff) {
+            /* Surrogate character.  Escape the original
+               byte sequence with surrogateescape. */
+            argsize -= converted;
+            while (converted--)
+                *out++ = 0xdc00 + *in++;
+            continue;
+        }
+        /* successfully converted some bytes */
+        in += converted;
+        argsize -= converted;
+        out++;
+    }
+#else
+    /* Cannot use C locale for escaping; manually escape as if charset
+       is ASCII (i.e. escape all bytes > 128. This will still roundtrip
+       correctly in the locale's charset, which must be an ASCII superset. */
+    res = (wchar_t *)malloc((strlen(arg)+1)*sizeof(wchar_t));
+    if (!res) goto oom;
+    in = (unsigned char*)arg;
+    out = res;
+    while(*in)
+        if(*in < 128)
+            *out++ = *in++;
+        else
+            *out++ = 0xdc00 + *in++;
+    *out = 0;
+#endif
+    return res;
+oom:
+    fprintf(stderr, "out of memory\\n");
+    return NULL;
+}
+
+#endif
+
+int
+%(main_method)s(int argc, char **argv)
+{
+    if (!argc) {
+        return __Pyx_main(0, NULL);
+    }
+    else {
+        int i, res;
+        wchar_t **argv_copy = (wchar_t **)malloc(sizeof(wchar_t*)*argc);
+        /* We need a second copy, as Python might modify the first one. */
+        wchar_t **argv_copy2 = (wchar_t **)malloc(sizeof(wchar_t*)*argc);
+        char *oldloc = strdup(setlocale(LC_ALL, NULL));
+        if (!argv_copy || !argv_copy2 || !oldloc) {
+            fprintf(stderr, "out of memory\\n");
+            free(argv_copy);
+            free(argv_copy2);
+            free(oldloc);
+            return 1;
+        }
+        res = 0;
+        setlocale(LC_ALL, "");
+        for (i = 0; i < argc; i++) {
+            argv_copy2[i] = argv_copy[i] =
+#if PY_VERSION_HEX < 0x03050000
+                __Pyx_char2wchar(argv[i]);
+#else
+                Py_DecodeLocale(argv[i], NULL);
+#endif
+            if (!argv_copy[i]) res = 1;  /* failure, but continue to simplify cleanup */
+        }
+        setlocale(LC_ALL, oldloc);
+        free(oldloc);
+        if (res == 0)
+            res = __Pyx_main(argc, argv_copy);
+        for (i = 0; i < argc; i++) {
+#if PY_VERSION_HEX < 0x03050000
+            free(argv_copy2[i]);
+#else
+            PyMem_RawFree(argv_copy2[i]);
+#endif
+        }
+        free(argv_copy);
+        free(argv_copy2);
+        return res;
+    }
+}
+#endif
diff --git a/contrib/tools/cython_py2/Cython/Utility/Exceptions.c b/contrib/tools/cython_py2/Cython/Utility/Exceptions.c
new file mode 100644
index 00000000000..ab6f69fb182
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Exceptions.c
@@ -0,0 +1,1137 @@
+// Exception raising code
+//
+// Exceptions are raised by __Pyx_Raise() and stored as plain
+// type/value/tb in PyThreadState->curexc_*.  When being caught by an
+// 'except' statement, curexc_* is moved over to exc_* by
+// __Pyx_GetException()
+
+
+/////////////// AssertionsEnabled.init ///////////////
+
+if (likely(__Pyx_init_assertions_enabled() == 0)); else
+// error propagation code is appended automatically
+
+/////////////// AssertionsEnabled.proto ///////////////
+
+#if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX < 0x02070600 && !defined(Py_OptimizeFlag)
+  #define __Pyx_init_assertions_enabled()  (0)
+  #define __pyx_assertions_enabled()  (1)
+#elif CYTHON_COMPILING_IN_LIMITED_API  ||  (CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030C0000)
+  // Py_OptimizeFlag is deprecated in Py3.12+ and not available in the Limited API.
+  static int __pyx_assertions_enabled_flag;
+  #define __pyx_assertions_enabled() (__pyx_assertions_enabled_flag)
+
+  static int __Pyx_init_assertions_enabled(void) {
+    PyObject *builtins, *debug, *debug_str;
+    int flag;
+    builtins = PyEval_GetBuiltins();
+    if (!builtins) goto bad;
+    debug_str = PyUnicode_FromStringAndSize("__debug__", 9);
+    if (!debug_str) goto bad;
+    debug = PyObject_GetItem(builtins, debug_str);
+    Py_DECREF(debug_str);
+    if (!debug) goto bad;
+    flag = PyObject_IsTrue(debug);
+    Py_DECREF(debug);
+    if (flag == -1) goto bad;
+    __pyx_assertions_enabled_flag = flag;
+    return 0;
+  bad:
+    __pyx_assertions_enabled_flag = 1;
+    // We (rarely) may not have an exception set, but the calling code will call PyErr_Occurred() either way.
+    return -1;
+  }
+#else
+  #define __Pyx_init_assertions_enabled()  (0)
+  #define __pyx_assertions_enabled()  (!Py_OptimizeFlag)
+#endif
+
+
+/////////////// ErrOccurredWithGIL.proto ///////////////
+static CYTHON_INLINE int __Pyx_ErrOccurredWithGIL(void); /* proto */
+
+/////////////// ErrOccurredWithGIL ///////////////
+static CYTHON_INLINE int __Pyx_ErrOccurredWithGIL(void) {
+  int err;
+  #ifdef WITH_THREAD
+  PyGILState_STATE _save = PyGILState_Ensure();
+  #endif
+  err = !!PyErr_Occurred();
+  #ifdef WITH_THREAD
+  PyGILState_Release(_save);
+  #endif
+  return err;
+}
+
+
+/////////////// PyThreadStateGet.proto ///////////////
+//@substitute: naming
+
+#if CYTHON_FAST_THREAD_STATE
+#define __Pyx_PyThreadState_declare  PyThreadState *$local_tstate_cname;
+#define __Pyx_PyThreadState_assign  $local_tstate_cname = __Pyx_PyThreadState_Current;
+#if PY_VERSION_HEX >= 0x030C00A6
+#define __Pyx_PyErr_Occurred()  ($local_tstate_cname->current_exception != NULL)
+#define __Pyx_PyErr_CurrentExceptionType()  ($local_tstate_cname->current_exception ? (PyObject*) Py_TYPE($local_tstate_cname->current_exception) : (PyObject*) NULL)
+#else
+#define __Pyx_PyErr_Occurred()  ($local_tstate_cname->curexc_type != NULL)
+#define __Pyx_PyErr_CurrentExceptionType()  ($local_tstate_cname->curexc_type)
+#endif
+#else
+// !CYTHON_FAST_THREAD_STATE
+#define __Pyx_PyThreadState_declare
+#define __Pyx_PyThreadState_assign
+#define __Pyx_PyErr_Occurred()  (PyErr_Occurred() != NULL)
+#define __Pyx_PyErr_CurrentExceptionType()  PyErr_Occurred()
+#endif
+
+
+/////////////// PyErrExceptionMatches.proto ///////////////
+//@substitute: naming
+
+#if CYTHON_FAST_THREAD_STATE
+#define __Pyx_PyErr_ExceptionMatches(err) __Pyx_PyErr_ExceptionMatchesInState($local_tstate_cname, err)
+static CYTHON_INLINE int __Pyx_PyErr_ExceptionMatchesInState(PyThreadState* tstate, PyObject* err);
+#else
+#define __Pyx_PyErr_ExceptionMatches(err)  PyErr_ExceptionMatches(err)
+#endif
+
+/////////////// PyErrExceptionMatches ///////////////
+
+#if CYTHON_FAST_THREAD_STATE
+static int __Pyx_PyErr_ExceptionMatchesTuple(PyObject *exc_type, PyObject *tuple) {
+    Py_ssize_t i, n;
+    n = PyTuple_GET_SIZE(tuple);
+#if PY_MAJOR_VERSION >= 3
+    // the tighter subtype checking in Py3 allows faster out-of-order comparison
+    for (i=0; i<n; i++) {
+        if (exc_type == PyTuple_GET_ITEM(tuple, i)) return 1;
+    }
+#endif
+    for (i=0; i<n; i++) {
+        if (__Pyx_PyErr_GivenExceptionMatches(exc_type, PyTuple_GET_ITEM(tuple, i))) return 1;
+    }
+    return 0;
+}
+
+static CYTHON_INLINE int __Pyx_PyErr_ExceptionMatchesInState(PyThreadState* tstate, PyObject* err) {
+    int result;
+    PyObject *exc_type;
+#if PY_VERSION_HEX >= 0x030C00A6
+    PyObject *current_exception = tstate->current_exception;
+    if (unlikely(!current_exception)) return 0;
+    exc_type = (PyObject*) Py_TYPE(current_exception);
+    if (exc_type == err) return 1;
+#else
+    exc_type = tstate->curexc_type;
+    if (exc_type == err) return 1;
+    if (unlikely(!exc_type)) return 0;
+#endif
+    #if CYTHON_AVOID_BORROWED_REFS
+    Py_INCREF(exc_type);
+    #endif
+    if (unlikely(PyTuple_Check(err))) {
+        result = __Pyx_PyErr_ExceptionMatchesTuple(exc_type, err);
+    } else {
+        result = __Pyx_PyErr_GivenExceptionMatches(exc_type, err);
+    }
+    #if CYTHON_AVOID_BORROWED_REFS
+    Py_DECREF(exc_type);
+    #endif
+    return result;
+}
+#endif
+
+/////////////// PyErrFetchRestore.proto ///////////////
+//@substitute: naming
+//@requires: PyThreadStateGet
+
+#if CYTHON_FAST_THREAD_STATE
+#define __Pyx_PyErr_Clear() __Pyx_ErrRestore(NULL, NULL, NULL)
+#define __Pyx_ErrRestoreWithState(type, value, tb)  __Pyx_ErrRestoreInState(PyThreadState_GET(), type, value, tb)
+#define __Pyx_ErrFetchWithState(type, value, tb)    __Pyx_ErrFetchInState(PyThreadState_GET(), type, value, tb)
+#define __Pyx_ErrRestore(type, value, tb)  __Pyx_ErrRestoreInState($local_tstate_cname, type, value, tb)
+#define __Pyx_ErrFetch(type, value, tb)    __Pyx_ErrFetchInState($local_tstate_cname, type, value, tb)
+static CYTHON_INLINE void __Pyx_ErrRestoreInState(PyThreadState *tstate, PyObject *type, PyObject *value, PyObject *tb); /*proto*/
+static CYTHON_INLINE void __Pyx_ErrFetchInState(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x030C00A6
+#define __Pyx_PyErr_SetNone(exc) (Py_INCREF(exc), __Pyx_ErrRestore((exc), NULL, NULL))
+#else
+#define __Pyx_PyErr_SetNone(exc) PyErr_SetNone(exc)
+#endif
+
+#else
+#define __Pyx_PyErr_Clear() PyErr_Clear()
+#define __Pyx_PyErr_SetNone(exc) PyErr_SetNone(exc)
+#define __Pyx_ErrRestoreWithState(type, value, tb)  PyErr_Restore(type, value, tb)
+#define __Pyx_ErrFetchWithState(type, value, tb)  PyErr_Fetch(type, value, tb)
+#define __Pyx_ErrRestoreInState(tstate, type, value, tb)  PyErr_Restore(type, value, tb)
+#define __Pyx_ErrFetchInState(tstate, type, value, tb)  PyErr_Fetch(type, value, tb)
+#define __Pyx_ErrRestore(type, value, tb)  PyErr_Restore(type, value, tb)
+#define __Pyx_ErrFetch(type, value, tb)  PyErr_Fetch(type, value, tb)
+#endif
+
+/////////////// PyErrFetchRestore ///////////////
+
+#if CYTHON_FAST_THREAD_STATE
+static CYTHON_INLINE void __Pyx_ErrRestoreInState(PyThreadState *tstate, PyObject *type, PyObject *value, PyObject *tb) {
+#if PY_VERSION_HEX >= 0x030C00A6
+    PyObject *tmp_value;
+    assert(type == NULL || (value != NULL && type == (PyObject*) Py_TYPE(value)));
+    if (value) {
+        #if CYTHON_COMPILING_IN_CPYTHON
+        if (unlikely(((PyBaseExceptionObject*) value)->traceback != tb))
+        #endif
+            // If this fails, we may lose the traceback but still set the expected exception below.
+            PyException_SetTraceback(value, tb);
+    }
+    tmp_value = tstate->current_exception;
+    tstate->current_exception = value;
+    Py_XDECREF(tmp_value);
+    Py_XDECREF(type);
+    Py_XDECREF(tb);
+#else
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    tmp_type = tstate->curexc_type;
+    tmp_value = tstate->curexc_value;
+    tmp_tb = tstate->curexc_traceback;
+    tstate->curexc_type = type;
+    tstate->curexc_value = value;
+    tstate->curexc_traceback = tb;
+    Py_XDECREF(tmp_type);
+    Py_XDECREF(tmp_value);
+    Py_XDECREF(tmp_tb);
+#endif
+}
+
+static CYTHON_INLINE void __Pyx_ErrFetchInState(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb) {
+#if PY_VERSION_HEX >= 0x030C00A6
+    PyObject* exc_value;
+    exc_value = tstate->current_exception;
+    tstate->current_exception = 0;
+    *value = exc_value;
+    *type = NULL;
+    *tb = NULL;
+    if (exc_value) {
+        *type = (PyObject*) Py_TYPE(exc_value);
+        Py_INCREF(*type);
+        #if CYTHON_COMPILING_IN_CPYTHON
+        *tb = ((PyBaseExceptionObject*) exc_value)->traceback;
+        Py_XINCREF(*tb);
+        #else
+        *tb = PyException_GetTraceback(exc_value);
+        #endif
+    }
+#else
+    *type = tstate->curexc_type;
+    *value = tstate->curexc_value;
+    *tb = tstate->curexc_traceback;
+    tstate->curexc_type = 0;
+    tstate->curexc_value = 0;
+    tstate->curexc_traceback = 0;
+#endif
+}
+#endif
+
+/////////////// RaiseException.proto ///////////////
+
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause); /*proto*/
+
+/////////////// RaiseException ///////////////
+//@requires: PyErrFetchRestore
+//@requires: PyThreadStateGet
+
+// The following function is based on do_raise() from ceval.c. There
+// are separate versions for Python2 and Python3 as exception handling
+// has changed quite a lot between the two versions.
+
+#if PY_MAJOR_VERSION < 3
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause) {
+    __Pyx_PyThreadState_declare
+    CYTHON_UNUSED_VAR(cause);
+    /* 'cause' is only used in Py3 */
+    Py_XINCREF(type);
+    if (!value || value == Py_None)
+        value = NULL;
+    else
+        Py_INCREF(value);
+
+    if (!tb || tb == Py_None)
+        tb = NULL;
+    else {
+        Py_INCREF(tb);
+        if (!PyTraceBack_Check(tb)) {
+            PyErr_SetString(PyExc_TypeError,
+                "raise: arg 3 must be a traceback or None");
+            goto raise_error;
+        }
+    }
+
+    if (PyType_Check(type)) {
+        /* instantiate the type now (we don't know when and how it will be caught) */
+#if CYTHON_COMPILING_IN_PYPY
+        /* PyPy can't handle value == NULL */
+        if (!value) {
+            Py_INCREF(Py_None);
+            value = Py_None;
+        }
+#endif
+        PyErr_NormalizeException(&type, &value, &tb);
+
+    } else {
+        /* Raising an instance.  The value should be a dummy. */
+        if (value) {
+            PyErr_SetString(PyExc_TypeError,
+                "instance exception may not have a separate value");
+            goto raise_error;
+        }
+        /* Normalize to raise <class>, <instance> */
+        value = type;
+        type = (PyObject*) Py_TYPE(type);
+        Py_INCREF(type);
+        if (!PyType_IsSubtype((PyTypeObject *)type, (PyTypeObject *)PyExc_BaseException)) {
+            PyErr_SetString(PyExc_TypeError,
+                "raise: exception class must be a subclass of BaseException");
+            goto raise_error;
+        }
+    }
+
+    __Pyx_PyThreadState_assign
+    __Pyx_ErrRestore(type, value, tb);
+    return;
+raise_error:
+    Py_XDECREF(value);
+    Py_XDECREF(type);
+    Py_XDECREF(tb);
+    return;
+}
+
+#else /* Python 3+ */
+
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause) {
+    PyObject* owned_instance = NULL;
+    if (tb == Py_None) {
+        tb = 0;
+    } else if (tb && !PyTraceBack_Check(tb)) {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: arg 3 must be a traceback or None");
+        goto bad;
+    }
+    if (value == Py_None)
+        value = 0;
+
+    if (PyExceptionInstance_Check(type)) {
+        if (value) {
+            PyErr_SetString(PyExc_TypeError,
+                "instance exception may not have a separate value");
+            goto bad;
+        }
+        value = type;
+        type = (PyObject*) Py_TYPE(value);
+    } else if (PyExceptionClass_Check(type)) {
+        // make sure value is an exception instance of type
+        PyObject *instance_class = NULL;
+        if (value && PyExceptionInstance_Check(value)) {
+            instance_class = (PyObject*) Py_TYPE(value);
+            if (instance_class != type) {
+                int is_subclass = PyObject_IsSubclass(instance_class, type);
+                if (!is_subclass) {
+                    instance_class = NULL;
+                } else if (unlikely(is_subclass == -1)) {
+                    // error on subclass test
+                    goto bad;
+                } else {
+                    // believe the instance
+                    type = instance_class;
+                }
+            }
+        }
+        if (!instance_class) {
+            // instantiate the type now (we don't know when and how it will be caught)
+            // assuming that 'value' is an argument to the type's constructor
+            // not using PyErr_NormalizeException() to avoid ref-counting problems
+            PyObject *args;
+            if (!value)
+                args = PyTuple_New(0);
+            else if (PyTuple_Check(value)) {
+                Py_INCREF(value);
+                args = value;
+            } else
+                args = PyTuple_Pack(1, value);
+            if (!args)
+                goto bad;
+            owned_instance = PyObject_Call(type, args, NULL);
+            Py_DECREF(args);
+            if (!owned_instance)
+                goto bad;
+            value = owned_instance;
+            if (!PyExceptionInstance_Check(value)) {
+                PyErr_Format(PyExc_TypeError,
+                             "calling %R should have returned an instance of "
+                             "BaseException, not %R",
+                             type, Py_TYPE(value));
+                goto bad;
+            }
+        }
+    } else {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: exception class must be a subclass of BaseException");
+        goto bad;
+    }
+
+    if (cause) {
+        PyObject *fixed_cause;
+        if (cause == Py_None) {
+            // raise ... from None
+            fixed_cause = NULL;
+        } else if (PyExceptionClass_Check(cause)) {
+            fixed_cause = PyObject_CallObject(cause, NULL);
+            if (fixed_cause == NULL)
+                goto bad;
+        } else if (PyExceptionInstance_Check(cause)) {
+            fixed_cause = cause;
+            Py_INCREF(fixed_cause);
+        } else {
+            PyErr_SetString(PyExc_TypeError,
+                            "exception causes must derive from "
+                            "BaseException");
+            goto bad;
+        }
+        PyException_SetCause(value, fixed_cause);
+    }
+
+    PyErr_SetObject(type, value);
+
+    if (tb) {
+      #if PY_VERSION_HEX >= 0x030C00A6
+        // If this fails, we just get a different exception, so ignore the return value.
+        PyException_SetTraceback(value, tb);
+      #elif CYTHON_FAST_THREAD_STATE
+        PyThreadState *tstate = __Pyx_PyThreadState_Current;
+        PyObject* tmp_tb = tstate->curexc_traceback;
+        if (tb != tmp_tb) {
+            Py_INCREF(tb);
+            tstate->curexc_traceback = tb;
+            Py_XDECREF(tmp_tb);
+        }
+#else
+        PyObject *tmp_type, *tmp_value, *tmp_tb;
+        PyErr_Fetch(&tmp_type, &tmp_value, &tmp_tb);
+        Py_INCREF(tb);
+        PyErr_Restore(tmp_type, tmp_value, tb);
+        Py_XDECREF(tmp_tb);
+#endif
+    }
+
+bad:
+    Py_XDECREF(owned_instance);
+    return;
+}
+#endif
+
+
+/////////////// GetTopmostException.proto ///////////////
+
+#if CYTHON_USE_EXC_INFO_STACK && CYTHON_FAST_THREAD_STATE
+static _PyErr_StackItem * __Pyx_PyErr_GetTopmostException(PyThreadState *tstate);
+#endif
+
+/////////////// GetTopmostException ///////////////
+
+#if CYTHON_USE_EXC_INFO_STACK && CYTHON_FAST_THREAD_STATE
+// Copied from errors.c in CPython.
+static _PyErr_StackItem *
+__Pyx_PyErr_GetTopmostException(PyThreadState *tstate)
+{
+    _PyErr_StackItem *exc_info = tstate->exc_info;
+    while ((exc_info->exc_value == NULL || exc_info->exc_value == Py_None) &&
+           exc_info->previous_item != NULL)
+    {
+        exc_info = exc_info->previous_item;
+    }
+    return exc_info;
+}
+#endif
+
+
+/////////////// GetException.proto ///////////////
+//@substitute: naming
+//@requires: PyThreadStateGet
+
+#if CYTHON_FAST_THREAD_STATE
+#define __Pyx_GetException(type, value, tb)  __Pyx__GetException($local_tstate_cname, type, value, tb)
+static int __Pyx__GetException(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+#else
+static int __Pyx_GetException(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+#endif
+
+/////////////// GetException ///////////////
+
+#if CYTHON_FAST_THREAD_STATE
+static int __Pyx__GetException(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb)
+#else
+static int __Pyx_GetException(PyObject **type, PyObject **value, PyObject **tb)
+#endif
+{
+    PyObject *local_type = NULL, *local_value, *local_tb = NULL;
+#if CYTHON_FAST_THREAD_STATE
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+  #if PY_VERSION_HEX >= 0x030C00A6
+    local_value = tstate->current_exception;
+    tstate->current_exception = 0;
+    if (likely(local_value)) {
+        local_type = (PyObject*) Py_TYPE(local_value);
+        Py_INCREF(local_type);
+        local_tb = PyException_GetTraceback(local_value);
+    }
+  #else
+    local_type = tstate->curexc_type;
+    local_value = tstate->curexc_value;
+    local_tb = tstate->curexc_traceback;
+    tstate->curexc_type = 0;
+    tstate->curexc_value = 0;
+    tstate->curexc_traceback = 0;
+  #endif
+#else
+    PyErr_Fetch(&local_type, &local_value, &local_tb);
+#endif
+
+    PyErr_NormalizeException(&local_type, &local_value, &local_tb);
+#if CYTHON_FAST_THREAD_STATE && PY_VERSION_HEX >= 0x030C00A6
+    if (unlikely(tstate->current_exception))
+#elif CYTHON_FAST_THREAD_STATE
+    if (unlikely(tstate->curexc_type))
+#else
+    if (unlikely(PyErr_Occurred()))
+#endif
+        goto bad;
+
+    #if PY_MAJOR_VERSION >= 3
+    if (local_tb) {
+        if (unlikely(PyException_SetTraceback(local_value, local_tb) < 0))
+            goto bad;
+    }
+    #endif
+
+    // traceback may be NULL for freshly raised exceptions
+    Py_XINCREF(local_tb);
+    // exception state may be temporarily empty in parallel loops (race condition)
+    Py_XINCREF(local_type);
+    Py_XINCREF(local_value);
+    *type = local_type;
+    *value = local_value;
+    *tb = local_tb;
+
+#if CYTHON_FAST_THREAD_STATE
+    #if CYTHON_USE_EXC_INFO_STACK
+    {
+        _PyErr_StackItem *exc_info = tstate->exc_info;
+      #if PY_VERSION_HEX >= 0x030B00a4
+        tmp_value = exc_info->exc_value;
+        exc_info->exc_value = local_value;
+        tmp_type = NULL;
+        tmp_tb = NULL;
+        Py_XDECREF(local_type);
+        Py_XDECREF(local_tb);
+      #else
+        tmp_type = exc_info->exc_type;
+        tmp_value = exc_info->exc_value;
+        tmp_tb = exc_info->exc_traceback;
+        exc_info->exc_type = local_type;
+        exc_info->exc_value = local_value;
+        exc_info->exc_traceback = local_tb;
+      #endif
+    }
+    #else
+    tmp_type = tstate->exc_type;
+    tmp_value = tstate->exc_value;
+    tmp_tb = tstate->exc_traceback;
+    tstate->exc_type = local_type;
+    tstate->exc_value = local_value;
+    tstate->exc_traceback = local_tb;
+    #endif
+    // Make sure tstate is in a consistent state when we XDECREF
+    // these objects (DECREF may run arbitrary code).
+    Py_XDECREF(tmp_type);
+    Py_XDECREF(tmp_value);
+    Py_XDECREF(tmp_tb);
+#else
+    PyErr_SetExcInfo(local_type, local_value, local_tb);
+#endif
+
+    return 0;
+
+bad:
+    *type = 0;
+    *value = 0;
+    *tb = 0;
+    Py_XDECREF(local_type);
+    Py_XDECREF(local_value);
+    Py_XDECREF(local_tb);
+    return -1;
+}
+
+/////////////// ReRaiseException.proto ///////////////
+
+static CYTHON_INLINE void __Pyx_ReraiseException(void); /*proto*/
+
+/////////////// ReRaiseException ///////////////
+//@requires: GetTopmostException
+
+static CYTHON_INLINE void __Pyx_ReraiseException(void) {
+    PyObject *type = NULL, *value = NULL, *tb = NULL;
+#if CYTHON_FAST_THREAD_STATE
+    PyThreadState *tstate = PyThreadState_GET();
+  #if CYTHON_USE_EXC_INFO_STACK
+    _PyErr_StackItem *exc_info = __Pyx_PyErr_GetTopmostException(tstate);
+    value = exc_info->exc_value;
+    #if PY_VERSION_HEX >= 0x030B00a4
+    if (unlikely(value == Py_None)) {
+        value = NULL;
+    } else if (value) {
+        Py_INCREF(value);
+        type = (PyObject*) Py_TYPE(value);
+        Py_INCREF(type);
+        tb = PyException_GetTraceback(value);
+    }
+    #else
+    type = exc_info->exc_type;
+    tb = exc_info->exc_traceback;
+    Py_XINCREF(type);
+    Py_XINCREF(value);
+    Py_XINCREF(tb);
+    #endif
+  #else
+    type = tstate->exc_type;
+    value = tstate->exc_value;
+    tb = tstate->exc_traceback;
+    Py_XINCREF(type);
+    Py_XINCREF(value);
+    Py_XINCREF(tb);
+  #endif
+#else
+    PyErr_GetExcInfo(&type, &value, &tb);
+#endif
+    if (unlikely(!type || type == Py_None)) {
+        Py_XDECREF(type);
+        Py_XDECREF(value);
+        Py_XDECREF(tb);
+        // message copied from Py3
+        PyErr_SetString(PyExc_RuntimeError,
+            "No active exception to reraise");
+    } else {
+        PyErr_Restore(type, value, tb);
+    }
+}
+
+/////////////// SaveResetException.proto ///////////////
+//@substitute: naming
+//@requires: PyThreadStateGet
+
+#if CYTHON_FAST_THREAD_STATE
+#define __Pyx_ExceptionSave(type, value, tb)  __Pyx__ExceptionSave($local_tstate_cname, type, value, tb)
+static CYTHON_INLINE void __Pyx__ExceptionSave(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+#define __Pyx_ExceptionReset(type, value, tb)  __Pyx__ExceptionReset($local_tstate_cname, type, value, tb)
+static CYTHON_INLINE void __Pyx__ExceptionReset(PyThreadState *tstate, PyObject *type, PyObject *value, PyObject *tb); /*proto*/
+
+#else
+
+#define __Pyx_ExceptionSave(type, value, tb)   PyErr_GetExcInfo(type, value, tb)
+#define __Pyx_ExceptionReset(type, value, tb)  PyErr_SetExcInfo(type, value, tb)
+#endif
+
+/////////////// SaveResetException ///////////////
+//@requires: GetTopmostException
+
+#if CYTHON_FAST_THREAD_STATE
+static CYTHON_INLINE void __Pyx__ExceptionSave(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb) {
+  #if CYTHON_USE_EXC_INFO_STACK && PY_VERSION_HEX >= 0x030B00a4
+    _PyErr_StackItem *exc_info = __Pyx_PyErr_GetTopmostException(tstate);
+    PyObject *exc_value = exc_info->exc_value;
+    if (exc_value == NULL || exc_value == Py_None) {
+        *value = NULL;
+        *type = NULL;
+        *tb = NULL;
+    } else {
+        *value = exc_value;
+        Py_INCREF(*value);
+        *type = (PyObject*) Py_TYPE(exc_value);
+        Py_INCREF(*type);
+        *tb = PyException_GetTraceback(exc_value);
+    }
+  #elif CYTHON_USE_EXC_INFO_STACK
+    _PyErr_StackItem *exc_info = __Pyx_PyErr_GetTopmostException(tstate);
+    *type = exc_info->exc_type;
+    *value = exc_info->exc_value;
+    *tb = exc_info->exc_traceback;
+    Py_XINCREF(*type);
+    Py_XINCREF(*value);
+    Py_XINCREF(*tb);
+  #else
+    *type = tstate->exc_type;
+    *value = tstate->exc_value;
+    *tb = tstate->exc_traceback;
+    Py_XINCREF(*type);
+    Py_XINCREF(*value);
+    Py_XINCREF(*tb);
+  #endif
+}
+
+static CYTHON_INLINE void __Pyx__ExceptionReset(PyThreadState *tstate, PyObject *type, PyObject *value, PyObject *tb) {
+  #if CYTHON_USE_EXC_INFO_STACK && PY_VERSION_HEX >= 0x030B00a4
+    _PyErr_StackItem *exc_info = tstate->exc_info;
+    PyObject *tmp_value = exc_info->exc_value;
+    exc_info->exc_value = value;
+    Py_XDECREF(tmp_value);
+    // TODO: avoid passing these at all
+    Py_XDECREF(type);
+    Py_XDECREF(tb);
+  #else
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    #if CYTHON_USE_EXC_INFO_STACK
+    _PyErr_StackItem *exc_info = tstate->exc_info;
+    tmp_type = exc_info->exc_type;
+    tmp_value = exc_info->exc_value;
+    tmp_tb = exc_info->exc_traceback;
+    exc_info->exc_type = type;
+    exc_info->exc_value = value;
+    exc_info->exc_traceback = tb;
+    #else
+    tmp_type = tstate->exc_type;
+    tmp_value = tstate->exc_value;
+    tmp_tb = tstate->exc_traceback;
+    tstate->exc_type = type;
+    tstate->exc_value = value;
+    tstate->exc_traceback = tb;
+    #endif
+    Py_XDECREF(tmp_type);
+    Py_XDECREF(tmp_value);
+    Py_XDECREF(tmp_tb);
+  #endif
+}
+#endif
+
+/////////////// SwapException.proto ///////////////
+//@substitute: naming
+//@requires: PyThreadStateGet
+
+#if CYTHON_FAST_THREAD_STATE
+#define __Pyx_ExceptionSwap(type, value, tb)  __Pyx__ExceptionSwap($local_tstate_cname, type, value, tb)
+static CYTHON_INLINE void __Pyx__ExceptionSwap(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+#else
+static CYTHON_INLINE void __Pyx_ExceptionSwap(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+#endif
+
+/////////////// SwapException ///////////////
+
+#if CYTHON_FAST_THREAD_STATE
+static CYTHON_INLINE void __Pyx__ExceptionSwap(PyThreadState *tstate, PyObject **type, PyObject **value, PyObject **tb) {
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+  #if CYTHON_USE_EXC_INFO_STACK && PY_VERSION_HEX >= 0x030B00a4
+    _PyErr_StackItem *exc_info = tstate->exc_info;
+    tmp_value = exc_info->exc_value;
+    exc_info->exc_value = *value;
+    if (tmp_value == NULL || tmp_value == Py_None) {
+        Py_XDECREF(tmp_value);
+        tmp_value = NULL;
+        tmp_type = NULL;
+        tmp_tb = NULL;
+    } else {
+        // TODO: avoid swapping these at all
+        tmp_type = (PyObject*) Py_TYPE(tmp_value);
+        Py_INCREF(tmp_type);
+        #if CYTHON_COMPILING_IN_CPYTHON
+        tmp_tb = ((PyBaseExceptionObject*) tmp_value)->traceback;
+        Py_XINCREF(tmp_tb);
+        #else
+        tmp_tb = PyException_GetTraceback(tmp_value);
+        #endif
+    }
+  #elif CYTHON_USE_EXC_INFO_STACK
+    _PyErr_StackItem *exc_info = tstate->exc_info;
+    tmp_type = exc_info->exc_type;
+    tmp_value = exc_info->exc_value;
+    tmp_tb = exc_info->exc_traceback;
+
+    exc_info->exc_type = *type;
+    exc_info->exc_value = *value;
+    exc_info->exc_traceback = *tb;
+  #else
+    tmp_type = tstate->exc_type;
+    tmp_value = tstate->exc_value;
+    tmp_tb = tstate->exc_traceback;
+
+    tstate->exc_type = *type;
+    tstate->exc_value = *value;
+    tstate->exc_traceback = *tb;
+  #endif
+
+    *type = tmp_type;
+    *value = tmp_value;
+    *tb = tmp_tb;
+}
+
+#else
+
+static CYTHON_INLINE void __Pyx_ExceptionSwap(PyObject **type, PyObject **value, PyObject **tb) {
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    PyErr_GetExcInfo(&tmp_type, &tmp_value, &tmp_tb);
+    PyErr_SetExcInfo(*type, *value, *tb);
+    *type = tmp_type;
+    *value = tmp_value;
+    *tb = tmp_tb;
+}
+#endif
+
+/////////////// WriteUnraisableException.proto ///////////////
+
+static void __Pyx_WriteUnraisable(const char *name, int clineno,
+                                  int lineno, const char *filename,
+                                  int full_traceback, int nogil); /*proto*/
+
+/////////////// WriteUnraisableException ///////////////
+//@requires: PyErrFetchRestore
+//@requires: PyThreadStateGet
+
+static void __Pyx_WriteUnraisable(const char *name, int clineno,
+                                  int lineno, const char *filename,
+                                  int full_traceback, int nogil) {
+    PyObject *old_exc, *old_val, *old_tb;
+    PyObject *ctx;
+    __Pyx_PyThreadState_declare
+#ifdef WITH_THREAD
+    PyGILState_STATE state;
+    if (nogil)
+        state = PyGILState_Ensure();
+    /* arbitrary, to suppress warning */
+    else state = (PyGILState_STATE)0;
+#endif
+    CYTHON_UNUSED_VAR(clineno);
+    CYTHON_UNUSED_VAR(lineno);
+    CYTHON_UNUSED_VAR(filename);
+    CYTHON_MAYBE_UNUSED_VAR(nogil);
+
+    __Pyx_PyThreadState_assign
+    __Pyx_ErrFetch(&old_exc, &old_val, &old_tb);
+    if (full_traceback) {
+        Py_XINCREF(old_exc);
+        Py_XINCREF(old_val);
+        Py_XINCREF(old_tb);
+        __Pyx_ErrRestore(old_exc, old_val, old_tb);
+        PyErr_PrintEx(0);
+    }
+    #if PY_MAJOR_VERSION < 3
+    ctx = PyString_FromString(name);
+    #else
+    ctx = PyUnicode_FromString(name);
+    #endif
+    __Pyx_ErrRestore(old_exc, old_val, old_tb);
+    if (!ctx) {
+        PyErr_WriteUnraisable(Py_None);
+    } else {
+        PyErr_WriteUnraisable(ctx);
+        Py_DECREF(ctx);
+    }
+#ifdef WITH_THREAD
+    if (nogil)
+        PyGILState_Release(state);
+#endif
+}
+
+/////////////// CLineInTraceback.proto ///////////////
+
+#ifdef CYTHON_CLINE_IN_TRACEBACK  /* 0 or 1 to disable/enable C line display in tracebacks at C compile time */
+#define __Pyx_CLineForTraceback(tstate, c_line)  (((CYTHON_CLINE_IN_TRACEBACK)) ? c_line : 0)
+#else
+static int __Pyx_CLineForTraceback(PyThreadState *tstate, int c_line);/*proto*/
+#endif
+
+/////////////// CLineInTraceback ///////////////
+//@requires: ObjectHandling.c::PyObjectGetAttrStrNoError
+//@requires: ObjectHandling.c::PyDictVersioning
+//@requires: PyErrFetchRestore
+//@substitute: naming
+
+#ifndef CYTHON_CLINE_IN_TRACEBACK
+static int __Pyx_CLineForTraceback(PyThreadState *tstate, int c_line) {
+    PyObject *use_cline;
+    PyObject *ptype, *pvalue, *ptraceback;
+#if CYTHON_COMPILING_IN_CPYTHON
+    PyObject **cython_runtime_dict;
+#endif
+
+    CYTHON_MAYBE_UNUSED_VAR(tstate);
+
+    if (unlikely(!${cython_runtime_cname})) {
+        // Very early error where the runtime module is not set up yet.
+        return c_line;
+    }
+
+    __Pyx_ErrFetchInState(tstate, &ptype, &pvalue, &ptraceback);
+
+#if CYTHON_COMPILING_IN_CPYTHON
+    cython_runtime_dict = _PyObject_GetDictPtr(${cython_runtime_cname});
+    if (likely(cython_runtime_dict)) {
+        __PYX_PY_DICT_LOOKUP_IF_MODIFIED(
+            use_cline, *cython_runtime_dict,
+            __Pyx_PyDict_GetItemStr(*cython_runtime_dict, PYIDENT("cline_in_traceback")))
+    } else
+#endif
+    {
+      PyObject *use_cline_obj = __Pyx_PyObject_GetAttrStrNoError(${cython_runtime_cname}, PYIDENT("cline_in_traceback"));
+      if (use_cline_obj) {
+        use_cline = PyObject_Not(use_cline_obj) ? Py_False : Py_True;
+        Py_DECREF(use_cline_obj);
+      } else {
+        PyErr_Clear();
+        use_cline = NULL;
+      }
+    }
+    if (!use_cline) {
+        c_line = 0;
+        // No need to handle errors here when we reset the exception state just afterwards.
+        (void) PyObject_SetAttr(${cython_runtime_cname}, PYIDENT("cline_in_traceback"), Py_False);
+    }
+    else if (use_cline == Py_False || (use_cline != Py_True && PyObject_Not(use_cline) != 0)) {
+        c_line = 0;
+    }
+    __Pyx_ErrRestoreInState(tstate, ptype, pvalue, ptraceback);
+    return c_line;
+}
+#endif
+
+/////////////// AddTraceback.proto ///////////////
+
+static void __Pyx_AddTraceback(const char *funcname, int c_line,
+                               int py_line, const char *filename); /*proto*/
+
+/////////////// AddTraceback ///////////////
+//@requires: ModuleSetupCode.c::CodeObjectCache
+//@requires: CLineInTraceback
+//@substitute: naming
+
+#include "compile.h"
+#include "frameobject.h"
+#include "traceback.h"
+#if PY_VERSION_HEX >= 0x030b00a6 && !CYTHON_COMPILING_IN_LIMITED_API && !defined(PYPY_VERSION)
+  #ifndef Py_BUILD_CORE
+    #define Py_BUILD_CORE 1
+  #endif
+  #include "internal/pycore_frame.h"
+#endif
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+static PyObject *__Pyx_PyCode_Replace_For_AddTraceback(PyObject *code, PyObject *scratch_dict,
+                                                       PyObject *firstlineno, PyObject *name) {
+    PyObject *replace = NULL;
+    if (unlikely(PyDict_SetItemString(scratch_dict, "co_firstlineno", firstlineno))) return NULL;
+    if (unlikely(PyDict_SetItemString(scratch_dict, "co_name", name))) return NULL;
+
+    replace = PyObject_GetAttrString(code, "replace");
+    if (likely(replace)) {
+        PyObject *result;
+        result = PyObject_Call(replace, $empty_tuple, scratch_dict);
+        Py_DECREF(replace);
+        return result;
+    }
+    PyErr_Clear();
+
+    #if __PYX_LIMITED_VERSION_HEX < 0x030780000
+    // If we're here, we're probably on Python <=3.7 which doesn't have code.replace.
+    // In this we take a lazy interpreted route (without regard to performance
+    // since it's fairly old and this is mostly just to get something working)
+    {
+        PyObject *compiled = NULL, *result = NULL;
+        if (unlikely(PyDict_SetItemString(scratch_dict, "code", code))) return NULL;
+        if (unlikely(PyDict_SetItemString(scratch_dict, "type", (PyObject*)(&PyType_Type)))) return NULL;
+        compiled = Py_CompileString(
+            "out = type(code)(\n"
+            "  code.co_argcount, code.co_kwonlyargcount, code.co_nlocals, code.co_stacksize,\n"
+            "  code.co_flags, code.co_code, code.co_consts, code.co_names,\n"
+            "  code.co_varnames, code.co_filename, co_name, co_firstlineno,\n"
+            "  code.co_lnotab)\n", "<dummy>", Py_file_input);
+        if (!compiled) return NULL;
+        result = PyEval_EvalCode(compiled, scratch_dict, scratch_dict);
+        Py_DECREF(compiled);
+        if (!result) PyErr_Print();
+        Py_DECREF(result);
+        result = PyDict_GetItemString(scratch_dict, "out");
+        if (result) Py_INCREF(result);
+        return result;
+    }
+    #else
+    return NULL;
+    #endif
+}
+
+static void __Pyx_AddTraceback(const char *funcname, int c_line,
+                               int py_line, const char *filename) {
+    PyObject *code_object = NULL, *py_py_line = NULL, *py_funcname = NULL, *dict = NULL;
+    PyObject *replace = NULL, *getframe = NULL, *frame = NULL;
+    PyObject *exc_type, *exc_value, *exc_traceback;
+    int success = 0;
+    if (c_line) {
+        // Avoid "unused" warning as long as we don't use this.
+        (void) $cfilenm_cname;
+        (void) __Pyx_CLineForTraceback(__Pyx_PyThreadState_Current, c_line);
+    }
+
+    // DW - this is a horrendous hack, but I'm quite proud of it. Essentially
+    // we need to generate a frame with the right line number/filename/funcname.
+    // We do this by compiling a small bit of code that uses sys._getframe to get a
+    // frame, and then customizing the details of the code to match.
+    // We then run the code object and use the generated frame to set the traceback.
+
+    PyErr_Fetch(&exc_type, &exc_value, &exc_traceback);
+
+    code_object = Py_CompileString("_getframe()", filename, Py_eval_input);
+    if (unlikely(!code_object)) goto bad;
+    py_py_line = PyLong_FromLong(py_line);
+    if (unlikely(!py_py_line)) goto bad;
+    py_funcname = PyUnicode_FromString(funcname);
+    if (unlikely(!py_funcname)) goto bad;
+    dict = PyDict_New();
+    if (unlikely(!dict)) goto bad;
+    {
+        PyObject *old_code_object = code_object;
+        code_object = __Pyx_PyCode_Replace_For_AddTraceback(code_object, dict, py_py_line, py_funcname);
+        Py_DECREF(old_code_object);
+    }
+    if (unlikely(!code_object)) goto bad;
+
+    // Note that getframe is borrowed
+    getframe = PySys_GetObject("_getframe");
+    if (unlikely(!getframe)) goto bad;
+    // reuse dict as globals (nothing conflicts, and it saves an allocation)
+    if (unlikely(PyDict_SetItemString(dict, "_getframe", getframe))) goto bad;
+
+    frame = PyEval_EvalCode(code_object, dict, dict);
+    if (unlikely(!frame) || frame == Py_None) goto bad;
+    success = 1;
+
+  bad:
+    PyErr_Restore(exc_type, exc_value, exc_traceback);
+    Py_XDECREF(code_object);
+    Py_XDECREF(py_py_line);
+    Py_XDECREF(py_funcname);
+    Py_XDECREF(dict);
+    Py_XDECREF(replace);
+
+    if (success) {
+        // Unfortunately an easy way to check the type of frame isn't in the
+        // limited API. The check against None should cover the most
+        // likely wrong answer though.
+        PyTraceBack_Here(
+            // Python < 0x03090000 didn't expose PyFrameObject
+            // but they all expose struct _frame as an opaque type
+            (struct _frame*)frame);
+    }
+
+    Py_XDECREF(frame);
+}
+#else
+static PyCodeObject* __Pyx_CreateCodeObjectForTraceback(
+            const char *funcname, int c_line,
+            int py_line, const char *filename) {
+    PyCodeObject *py_code = NULL;
+    PyObject *py_funcname = NULL;
+    #if PY_MAJOR_VERSION < 3
+    PyObject *py_srcfile = NULL;
+
+    py_srcfile = PyString_FromString(filename);
+    if (!py_srcfile) goto bad;
+    #endif
+
+    if (c_line) {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromFormat( "%s (%s:%d)", funcname, $cfilenm_cname, c_line);
+        if (!py_funcname) goto bad;
+        #else
+        py_funcname = PyUnicode_FromFormat( "%s (%s:%d)", funcname, $cfilenm_cname, c_line);
+        if (!py_funcname) goto bad;
+        funcname = PyUnicode_AsUTF8(py_funcname);
+        if (!funcname) goto bad;
+        #endif
+    }
+    else {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromString(funcname);
+        if (!py_funcname) goto bad;
+        #endif
+    }
+    #if PY_MAJOR_VERSION < 3
+    py_code = __Pyx_PyCode_New(
+        0,            /*int argcount,*/
+        0,            /*int posonlyargcount,*/
+        0,            /*int kwonlyargcount,*/
+        0,            /*int nlocals,*/
+        0,            /*int stacksize,*/
+        0,            /*int flags,*/
+        $empty_bytes, /*PyObject *code,*/
+        $empty_tuple, /*PyObject *consts,*/
+        $empty_tuple, /*PyObject *names,*/
+        $empty_tuple, /*PyObject *varnames,*/
+        $empty_tuple, /*PyObject *freevars,*/
+        $empty_tuple, /*PyObject *cellvars,*/
+        py_srcfile,   /*PyObject *filename,*/
+        py_funcname,  /*PyObject *name,*/
+        py_line,      /*int firstlineno,*/
+        $empty_bytes  /*PyObject *lnotab*/
+    );
+    Py_DECREF(py_srcfile);
+    #else
+    py_code = PyCode_NewEmpty(filename, funcname, py_line);
+    #endif
+    Py_XDECREF(py_funcname);  /* XDECREF since it's only set on Py3 if cline */
+    return py_code;
+bad:
+    Py_XDECREF(py_funcname);
+    #if PY_MAJOR_VERSION < 3
+    Py_XDECREF(py_srcfile);
+    #endif
+    return NULL;
+}
+
+static void __Pyx_AddTraceback(const char *funcname, int c_line,
+                               int py_line, const char *filename) {
+    PyCodeObject *py_code = 0;
+    PyFrameObject *py_frame = 0;
+    PyThreadState *tstate = __Pyx_PyThreadState_Current;
+    PyObject *ptype, *pvalue, *ptraceback;
+
+    if (c_line) {
+        c_line = __Pyx_CLineForTraceback(tstate, c_line);
+    }
+
+    // Negate to avoid collisions between py and c lines.
+    py_code = $global_code_object_cache_find(c_line ? -c_line : py_line);
+    if (!py_code) {
+        __Pyx_ErrFetchInState(tstate, &ptype, &pvalue, &ptraceback);
+        py_code = __Pyx_CreateCodeObjectForTraceback(
+            funcname, c_line, py_line, filename);
+        if (!py_code) {
+            /* If the code object creation fails, then we should clear the
+               fetched exception references and propagate the new exception */
+            Py_XDECREF(ptype);
+            Py_XDECREF(pvalue);
+            Py_XDECREF(ptraceback);
+            goto bad;
+        }
+        __Pyx_ErrRestoreInState(tstate, ptype, pvalue, ptraceback);
+        $global_code_object_cache_insert(c_line ? -c_line : py_line, py_code);
+    }
+    py_frame = PyFrame_New(
+        tstate,            /*PyThreadState *tstate,*/
+        py_code,           /*PyCodeObject *code,*/
+        $moddict_cname,    /*PyObject *globals,*/
+        0                  /*PyObject *locals*/
+    );
+    if (!py_frame) goto bad;
+    __Pyx_PyFrame_SetLineNumber(py_frame, py_line);
+    PyTraceBack_Here(py_frame);
+bad:
+    Py_XDECREF(py_code);
+    Py_XDECREF(py_frame);
+}
+#endif
diff --git a/contrib/tools/cython_py2/Cython/Utility/ExtensionTypes.c b/contrib/tools/cython_py2/Cython/Utility/ExtensionTypes.c
new file mode 100644
index 00000000000..544e50b9420
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/ExtensionTypes.c
@@ -0,0 +1,660 @@
+/////////////// FixUpExtensionType.proto ///////////////
+
+#if CYTHON_USE_TYPE_SPECS
+static int __Pyx_fix_up_extension_type_from_spec(PyType_Spec *spec, PyTypeObject *type); /*proto*/
+#endif
+
+/////////////// FixUpExtensionType ///////////////
+//@requires:ModuleSetupCode.c::IncludeStructmemberH
+//@requires:StringTools.c::IncludeStringH
+
+#if CYTHON_USE_TYPE_SPECS
+static int __Pyx_fix_up_extension_type_from_spec(PyType_Spec *spec, PyTypeObject *type) {
+#if PY_VERSION_HEX > 0x030900B1 || CYTHON_COMPILING_IN_LIMITED_API
+    CYTHON_UNUSED_VAR(spec);
+    CYTHON_UNUSED_VAR(type);
+#else
+    // Set tp_weakreflist, tp_dictoffset, tp_vectorcalloffset
+    // Copied and adapted from https://bugs.python.org/issue38140
+    const PyType_Slot *slot = spec->slots;
+    while (slot && slot->slot && slot->slot != Py_tp_members)
+        slot++;
+    if (slot && slot->slot == Py_tp_members) {
+        int changed = 0;
+#if !(PY_VERSION_HEX <= 0x030900b1 && CYTHON_COMPILING_IN_CPYTHON)
+        const
+#endif
+            PyMemberDef *memb = (PyMemberDef*) slot->pfunc;
+        while (memb && memb->name) {
+            if (memb->name[0] == '_' && memb->name[1] == '_') {
+#if PY_VERSION_HEX < 0x030900b1
+                if (strcmp(memb->name, "__weaklistoffset__") == 0) {
+                    // The PyMemberDef must be a Py_ssize_t and readonly.
+                    assert(memb->type == T_PYSSIZET);
+                    assert(memb->flags == READONLY);
+                    type->tp_weaklistoffset = memb->offset;
+                    // FIXME: is it even worth calling PyType_Modified() here?
+                    changed = 1;
+                }
+                else if (strcmp(memb->name, "__dictoffset__") == 0) {
+                    // The PyMemberDef must be a Py_ssize_t and readonly.
+                    assert(memb->type == T_PYSSIZET);
+                    assert(memb->flags == READONLY);
+                    type->tp_dictoffset = memb->offset;
+                    // FIXME: is it even worth calling PyType_Modified() here?
+                    changed = 1;
+                }
+#if CYTHON_METH_FASTCALL
+                else if (strcmp(memb->name, "__vectorcalloffset__") == 0) {
+                    // The PyMemberDef must be a Py_ssize_t and readonly.
+                    assert(memb->type == T_PYSSIZET);
+                    assert(memb->flags == READONLY);
+#if PY_VERSION_HEX >= 0x030800b4
+                    type->tp_vectorcall_offset = memb->offset;
+#else
+                    type->tp_print = (printfunc) memb->offset;
+#endif
+                    // FIXME: is it even worth calling PyType_Modified() here?
+                    changed = 1;
+                }
+#endif
+#else
+                if ((0));
+#endif
+#if PY_VERSION_HEX <= 0x030900b1 && CYTHON_COMPILING_IN_CPYTHON
+                else if (strcmp(memb->name, "__module__") == 0) {
+                    // PyType_FromSpec() in CPython <= 3.9b1 overwrites this field with a constant string.
+                    // See https://bugs.python.org/issue40703
+                    PyObject *descr;
+                    // The PyMemberDef must be an object and normally readable, possibly writable.
+                    assert(memb->type == T_OBJECT);
+                    assert(memb->flags == 0 || memb->flags == READONLY);
+                    descr = PyDescr_NewMember(type, memb);
+                    if (unlikely(!descr))
+                        return -1;
+                    if (unlikely(PyDict_SetItem(type->tp_dict, PyDescr_NAME(descr), descr) < 0)) {
+                        Py_DECREF(descr);
+                        return -1;
+                    }
+                    Py_DECREF(descr);
+                    changed = 1;
+                }
+#endif
+            }
+            memb++;
+        }
+        if (changed)
+            PyType_Modified(type);
+    }
+#endif
+    return 0;
+}
+#endif
+
+
+/////////////// ValidateBasesTuple.proto ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON || CYTHON_COMPILING_IN_LIMITED_API || CYTHON_USE_TYPE_SPECS
+static int __Pyx_validate_bases_tuple(const char *type_name, Py_ssize_t dictoffset, PyObject *bases); /*proto*/
+#endif
+
+/////////////// ValidateBasesTuple ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON || CYTHON_COMPILING_IN_LIMITED_API || CYTHON_USE_TYPE_SPECS
+static int __Pyx_validate_bases_tuple(const char *type_name, Py_ssize_t dictoffset, PyObject *bases) {
+    // Loop over all bases (except the first) and check that those
+    // really are heap types. Otherwise, it would not be safe to
+    // subclass them.
+    //
+    // We also check tp_dictoffset: it is unsafe to inherit
+    // tp_dictoffset from a base class because the object structures
+    // would not be compatible. So, if our extension type doesn't set
+    // tp_dictoffset (i.e. there is no __dict__ attribute in the object
+    // structure), we need to check that none of the base classes sets
+    // it either.
+    Py_ssize_t i, n;
+#if CYTHON_ASSUME_SAFE_MACROS
+    n = PyTuple_GET_SIZE(bases);
+#else
+    n = PyTuple_Size(bases);
+    if (n < 0) return -1;
+#endif
+    for (i = 1; i < n; i++)  /* Skip first base */
+    {
+#if CYTHON_AVOID_BORROWED_REFS
+        PyObject *b0 = PySequence_GetItem(bases, i);
+        if (!b0) return -1;
+#elif CYTHON_ASSUME_SAFE_MACROS
+        PyObject *b0 = PyTuple_GET_ITEM(bases, i);
+#else
+        PyObject *b0 = PyTuple_GetItem(bases, i);
+        if (!b0) return -1;
+#endif
+        PyTypeObject *b;
+#if PY_MAJOR_VERSION < 3
+        /* Disallow old-style classes */
+        if (PyClass_Check(b0))
+        {
+            PyErr_Format(PyExc_TypeError, "base class '%.200s' is an old-style class",
+                         PyString_AS_STRING(((PyClassObject*)b0)->cl_name));
+#if CYTHON_AVOID_BORROWED_REFS
+            Py_DECREF(b0);
+#endif
+            return -1;
+        }
+#endif
+        b = (PyTypeObject*) b0;
+        if (!__Pyx_PyType_HasFeature(b, Py_TPFLAGS_HEAPTYPE))
+        {
+            __Pyx_TypeName b_name = __Pyx_PyType_GetName(b);
+            PyErr_Format(PyExc_TypeError,
+                "base class '" __Pyx_FMT_TYPENAME "' is not a heap type", b_name);
+            __Pyx_DECREF_TypeName(b_name);
+#if CYTHON_AVOID_BORROWED_REFS
+            Py_DECREF(b0);
+#endif
+            return -1;
+        }
+        if (dictoffset == 0)
+        {
+            Py_ssize_t b_dictoffset = 0;
+#if CYTHON_USE_TYPE_SLOTS || CYTHON_COMPILING_IN_PYPY
+            b_dictoffset = b->tp_dictoffset;
+#else
+            PyObject *py_b_dictoffset = PyObject_GetAttrString((PyObject*)b, "__dictoffset__");
+            if (!py_b_dictoffset) goto dictoffset_return;
+            b_dictoffset = PyLong_AsSsize_t(py_b_dictoffset);
+            Py_DECREF(py_b_dictoffset);
+            if (b_dictoffset == -1 && PyErr_Occurred()) goto dictoffset_return;
+#endif
+            if (b_dictoffset) {
+                {
+                    __Pyx_TypeName b_name = __Pyx_PyType_GetName(b);
+                    PyErr_Format(PyExc_TypeError,
+                        "extension type '%.200s' has no __dict__ slot, "
+                        "but base type '" __Pyx_FMT_TYPENAME "' has: "
+                        "either add 'cdef dict __dict__' to the extension type "
+                        "or add '__slots__ = [...]' to the base type",
+                        type_name, b_name);
+                    __Pyx_DECREF_TypeName(b_name);
+                }
+#if !(CYTHON_USE_TYPE_SLOTS || CYTHON_COMPILING_IN_PYPY)
+              dictoffset_return:
+#endif
+#if CYTHON_AVOID_BORROWED_REFS
+                Py_DECREF(b0);
+#endif
+                return -1;
+            }
+        }
+#if CYTHON_AVOID_BORROWED_REFS
+        Py_DECREF(b0);
+#endif
+    }
+    return 0;
+}
+#endif
+
+
+/////////////// PyType_Ready.proto ///////////////
+
+// unused when using type specs
+CYTHON_UNUSED static int __Pyx_PyType_Ready(PyTypeObject *t);/*proto*/
+
+/////////////// PyType_Ready ///////////////
+//@requires: ObjectHandling.c::PyObjectCallMethod0
+//@requires: ValidateBasesTuple
+
+// Wrapper around PyType_Ready() with some runtime checks and fixes
+// to deal with multiple inheritance.
+static int __Pyx_PyType_Ready(PyTypeObject *t) {
+
+// FIXME: is this really suitable for CYTHON_COMPILING_IN_LIMITED_API?
+#if CYTHON_USE_TYPE_SPECS || !(CYTHON_COMPILING_IN_CPYTHON || CYTHON_COMPILING_IN_LIMITED_API) || defined(PYSTON_MAJOR_VERSION)
+    // avoid C warning about unused helper function
+    (void)__Pyx_PyObject_CallMethod0;
+#if CYTHON_USE_TYPE_SPECS
+    (void)__Pyx_validate_bases_tuple;
+#endif
+
+    return PyType_Ready(t);
+
+#else
+    int r;
+    PyObject *bases = __Pyx_PyType_GetSlot(t, tp_bases, PyObject*);
+    if (bases && unlikely(__Pyx_validate_bases_tuple(t->tp_name, t->tp_dictoffset, bases) == -1))
+        return -1;
+
+#if PY_VERSION_HEX >= 0x03050000 && !defined(PYSTON_MAJOR_VERSION)
+    {
+        // Make sure GC does not pick up our non-heap type as heap type with this hack!
+        // For details, see https://github.com/cython/cython/issues/3603
+        int gc_was_enabled;
+    #if PY_VERSION_HEX >= 0x030A00b1
+        // finally added in Py3.10 :)
+        gc_was_enabled = PyGC_Disable();
+        (void)__Pyx_PyObject_CallMethod0;
+
+    #else
+        // Call gc.disable() as a backwards compatible fallback, but only if needed.
+        PyObject *ret, *py_status;
+        PyObject *gc = NULL;
+        #if PY_VERSION_HEX >= 0x030700a1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM+0 >= 0x07030400)
+        // https://foss.heptapod.net/pypy/pypy/-/issues/3385
+        gc = PyImport_GetModule(PYUNICODE("gc"));
+        #endif
+        if (unlikely(!gc)) gc = PyImport_Import(PYUNICODE("gc"));
+        if (unlikely(!gc)) return -1;
+        py_status = __Pyx_PyObject_CallMethod0(gc, PYUNICODE("isenabled"));
+        if (unlikely(!py_status)) {
+            Py_DECREF(gc);
+            return -1;
+        }
+        gc_was_enabled = __Pyx_PyObject_IsTrue(py_status);
+        Py_DECREF(py_status);
+        if (gc_was_enabled > 0) {
+            ret = __Pyx_PyObject_CallMethod0(gc, PYUNICODE("disable"));
+            if (unlikely(!ret)) {
+                Py_DECREF(gc);
+                return -1;
+            }
+            Py_DECREF(ret);
+        } else if (unlikely(gc_was_enabled == -1)) {
+            Py_DECREF(gc);
+            return -1;
+        }
+    #endif
+
+        // As of https://bugs.python.org/issue22079
+        // PyType_Ready enforces that all bases of a non-heap type are
+        // non-heap. We know that this is the case for the solid base but
+        // other bases are heap allocated and are kept alive through the
+        // tp_bases reference.
+        // Other than this check, the Py_TPFLAGS_HEAPTYPE flag is unused
+        // in PyType_Ready().
+        t->tp_flags |= Py_TPFLAGS_HEAPTYPE;
+#if PY_VERSION_HEX >= 0x030A0000
+        // As of https://github.com/python/cpython/pull/25520
+        // PyType_Ready marks types as immutable if they are static types
+        // and requires the Py_TPFLAGS_IMMUTABLETYPE flag to mark types as
+        // immutable
+        // Manually set the Py_TPFLAGS_IMMUTABLETYPE flag, since the type
+        // is immutable
+        t->tp_flags |= Py_TPFLAGS_IMMUTABLETYPE;
+#endif
+#else
+        // avoid C warning about unused helper function
+        (void)__Pyx_PyObject_CallMethod0;
+#endif
+
+    r = PyType_Ready(t);
+
+#if PY_VERSION_HEX >= 0x03050000 && !defined(PYSTON_MAJOR_VERSION)
+        t->tp_flags &= ~Py_TPFLAGS_HEAPTYPE;
+
+    #if PY_VERSION_HEX >= 0x030A00b1
+        if (gc_was_enabled)
+            PyGC_Enable();
+    #else
+        if (gc_was_enabled) {
+            PyObject *tp, *v, *tb;
+            PyErr_Fetch(&tp, &v, &tb);
+            ret = __Pyx_PyObject_CallMethod0(gc, PYUNICODE("enable"));
+            if (likely(ret || r == -1)) {
+                Py_XDECREF(ret);
+                // do not overwrite exceptions raised by PyType_Ready() above
+                PyErr_Restore(tp, v, tb);
+            } else {
+                // PyType_Ready() succeeded, but gc.enable() failed.
+                Py_XDECREF(tp);
+                Py_XDECREF(v);
+                Py_XDECREF(tb);
+                r = -1;
+            }
+        }
+        Py_DECREF(gc);
+    #endif
+    }
+#endif
+
+    return r;
+#endif
+}
+
+
+/////////////// PyTrashcan.proto ///////////////
+
+// These macros are taken from https://github.com/python/cpython/pull/11841
+// Unlike the Py_TRASHCAN_SAFE_BEGIN/Py_TRASHCAN_SAFE_END macros, they
+// allow dealing correctly with subclasses.
+
+// This requires CPython version >= 2.7.4
+// (or >= 3.2.4 but we don't support such old Python 3 versions anyway)
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x03080000
+// https://github.com/python/cpython/pull/11841 merged so Cython reimplementation
+// is no longer necessary
+#define __Pyx_TRASHCAN_BEGIN Py_TRASHCAN_BEGIN
+#define __Pyx_TRASHCAN_END Py_TRASHCAN_END
+#elif CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x02070400
+#define __Pyx_TRASHCAN_BEGIN_CONDITION(op, cond) \
+    do { \
+        PyThreadState *_tstate = NULL; \
+        // If "cond" is false, then _tstate remains NULL and the deallocator
+        // is run normally without involving the trashcan
+        if (cond) { \
+            _tstate = PyThreadState_GET(); \
+            if (_tstate->trash_delete_nesting >= PyTrash_UNWIND_LEVEL) { \
+                // Store the object (to be deallocated later) and jump past
+                // Py_TRASHCAN_END, skipping the body of the deallocator
+                _PyTrash_thread_deposit_object((PyObject*)(op)); \
+                break; \
+            } \
+            ++_tstate->trash_delete_nesting; \
+        }
+        // The body of the deallocator is here.
+#define __Pyx_TRASHCAN_END \
+        if (_tstate) { \
+            --_tstate->trash_delete_nesting; \
+            if (_tstate->trash_delete_later && _tstate->trash_delete_nesting <= 0) \
+                _PyTrash_thread_destroy_chain(); \
+        } \
+    } while (0);
+
+#define __Pyx_TRASHCAN_BEGIN(op, dealloc) __Pyx_TRASHCAN_BEGIN_CONDITION(op, \
+        __Pyx_PyObject_GetSlot(op, tp_dealloc, destructor) == (destructor)(dealloc))
+
+#else
+// The trashcan is a no-op on other Python implementations
+// or old CPython versions
+#define __Pyx_TRASHCAN_BEGIN(op, dealloc)
+#define __Pyx_TRASHCAN_END
+#endif
+
+/////////////// CallNextTpDealloc.proto ///////////////
+
+static void __Pyx_call_next_tp_dealloc(PyObject* obj, destructor current_tp_dealloc);
+
+/////////////// CallNextTpDealloc ///////////////
+
+static void __Pyx_call_next_tp_dealloc(PyObject* obj, destructor current_tp_dealloc) {
+    PyTypeObject* type = Py_TYPE(obj);
+    destructor tp_dealloc = NULL;
+    /* try to find the first parent type that has a different tp_dealloc() function */
+    while (type && __Pyx_PyType_GetSlot(type, tp_dealloc, destructor) != current_tp_dealloc)
+        type = __Pyx_PyType_GetSlot(type, tp_base, PyTypeObject*);
+    while (type && (tp_dealloc = __Pyx_PyType_GetSlot(type, tp_dealloc, destructor)) == current_tp_dealloc)
+        type = __Pyx_PyType_GetSlot(type, tp_base, PyTypeObject*);
+    if (type)
+        tp_dealloc(obj);
+}
+
+/////////////// CallNextTpTraverse.proto ///////////////
+
+static int __Pyx_call_next_tp_traverse(PyObject* obj, visitproc v, void *a, traverseproc current_tp_traverse);
+
+/////////////// CallNextTpTraverse ///////////////
+
+static int __Pyx_call_next_tp_traverse(PyObject* obj, visitproc v, void *a, traverseproc current_tp_traverse) {
+    PyTypeObject* type = Py_TYPE(obj);
+    traverseproc tp_traverse = NULL;
+    /* try to find the first parent type that has a different tp_traverse() function */
+    while (type && __Pyx_PyType_GetSlot(type, tp_traverse, traverseproc) != current_tp_traverse)
+        type = __Pyx_PyType_GetSlot(type, tp_base, PyTypeObject*);
+    while (type && (tp_traverse = __Pyx_PyType_GetSlot(type, tp_traverse, traverseproc)) == current_tp_traverse)
+        type = __Pyx_PyType_GetSlot(type, tp_base, PyTypeObject*);
+    if (type && tp_traverse)
+        return tp_traverse(obj, v, a);
+    // FIXME: really ignore?
+    return 0;
+}
+
+/////////////// CallNextTpClear.proto ///////////////
+
+static void __Pyx_call_next_tp_clear(PyObject* obj, inquiry current_tp_clear);
+
+/////////////// CallNextTpClear ///////////////
+
+static void __Pyx_call_next_tp_clear(PyObject* obj, inquiry current_tp_clear) {
+    PyTypeObject* type = Py_TYPE(obj);
+    inquiry tp_clear = NULL;
+    /* try to find the first parent type that has a different tp_clear() function */
+    while (type && __Pyx_PyType_GetSlot(type, tp_clear, inquiry) != current_tp_clear)
+        type = __Pyx_PyType_GetSlot(type, tp_base, PyTypeObject*);
+    while (type && (tp_clear = __Pyx_PyType_GetSlot(type, tp_clear, inquiry)) == current_tp_clear)
+        type = __Pyx_PyType_GetSlot(type, tp_base, PyTypeObject*);
+    if (type && tp_clear)
+        tp_clear(obj);
+}
+
+/////////////// SetupReduce.proto ///////////////
+
+#if !CYTHON_COMPILING_IN_LIMITED_API
+static int __Pyx_setup_reduce(PyObject* type_obj);
+#endif
+
+/////////////// SetupReduce ///////////////
+//@requires: ObjectHandling.c::PyObjectGetAttrStrNoError
+//@requires: ObjectHandling.c::PyObjectGetAttrStr
+//@substitute: naming
+
+#if !CYTHON_COMPILING_IN_LIMITED_API
+static int __Pyx_setup_reduce_is_named(PyObject* meth, PyObject* name) {
+  int ret;
+  PyObject *name_attr;
+
+  name_attr = __Pyx_PyObject_GetAttrStrNoError(meth, PYIDENT("__name__"));
+  if (likely(name_attr)) {
+      ret = PyObject_RichCompareBool(name_attr, name, Py_EQ);
+  } else {
+      ret = -1;
+  }
+
+  if (unlikely(ret < 0)) {
+      PyErr_Clear();
+      ret = 0;
+  }
+
+  Py_XDECREF(name_attr);
+  return ret;
+}
+
+static int __Pyx_setup_reduce(PyObject* type_obj) {
+    int ret = 0;
+    PyObject *object_reduce = NULL;
+    PyObject *object_getstate = NULL;
+    PyObject *object_reduce_ex = NULL;
+    PyObject *reduce = NULL;
+    PyObject *reduce_ex = NULL;
+    PyObject *reduce_cython = NULL;
+    PyObject *setstate = NULL;
+    PyObject *setstate_cython = NULL;
+    PyObject *getstate = NULL;
+
+#if CYTHON_USE_PYTYPE_LOOKUP
+    getstate = _PyType_Lookup((PyTypeObject*)type_obj, PYIDENT("__getstate__"));
+#else
+    getstate = __Pyx_PyObject_GetAttrStrNoError(type_obj, PYIDENT("__getstate__"));
+    if (!getstate && PyErr_Occurred()) {
+        goto __PYX_BAD;
+    }
+#endif
+    if (getstate) {
+        // Python 3.11 introduces object.__getstate__. Because it's version-specific failure to find it should not be an error
+#if CYTHON_USE_PYTYPE_LOOKUP
+        object_getstate = _PyType_Lookup(&PyBaseObject_Type, PYIDENT("__getstate__"));
+#else
+        object_getstate = __Pyx_PyObject_GetAttrStrNoError((PyObject*)&PyBaseObject_Type, PYIDENT("__getstate__"));
+        if (!object_getstate && PyErr_Occurred()) {
+            goto __PYX_BAD;
+        }
+#endif
+        if (object_getstate != getstate) {
+            goto __PYX_GOOD;
+        }
+    }
+
+#if CYTHON_USE_PYTYPE_LOOKUP
+    object_reduce_ex = _PyType_Lookup(&PyBaseObject_Type, PYIDENT("__reduce_ex__")); if (!object_reduce_ex) goto __PYX_BAD;
+#else
+    object_reduce_ex = __Pyx_PyObject_GetAttrStr((PyObject*)&PyBaseObject_Type, PYIDENT("__reduce_ex__")); if (!object_reduce_ex) goto __PYX_BAD;
+#endif
+
+    reduce_ex = __Pyx_PyObject_GetAttrStr(type_obj, PYIDENT("__reduce_ex__")); if (unlikely(!reduce_ex)) goto __PYX_BAD;
+    if (reduce_ex == object_reduce_ex) {
+
+#if CYTHON_USE_PYTYPE_LOOKUP
+        object_reduce = _PyType_Lookup(&PyBaseObject_Type, PYIDENT("__reduce__")); if (!object_reduce) goto __PYX_BAD;
+#else
+        object_reduce = __Pyx_PyObject_GetAttrStr((PyObject*)&PyBaseObject_Type, PYIDENT("__reduce__")); if (!object_reduce) goto __PYX_BAD;
+#endif
+        reduce = __Pyx_PyObject_GetAttrStr(type_obj, PYIDENT("__reduce__")); if (unlikely(!reduce)) goto __PYX_BAD;
+
+        if (reduce == object_reduce || __Pyx_setup_reduce_is_named(reduce, PYIDENT("__reduce_cython__"))) {
+            reduce_cython = __Pyx_PyObject_GetAttrStrNoError(type_obj, PYIDENT("__reduce_cython__"));
+            if (likely(reduce_cython)) {
+                ret = PyDict_SetItem(((PyTypeObject*)type_obj)->tp_dict, PYIDENT("__reduce__"), reduce_cython); if (unlikely(ret < 0)) goto __PYX_BAD;
+                ret = PyDict_DelItem(((PyTypeObject*)type_obj)->tp_dict, PYIDENT("__reduce_cython__")); if (unlikely(ret < 0)) goto __PYX_BAD;
+            } else if (reduce == object_reduce || PyErr_Occurred()) {
+                // Ignore if we're done, i.e. if 'reduce' already has the right name and the original is gone.
+                // Otherwise: error.
+                goto __PYX_BAD;
+            }
+
+            setstate = __Pyx_PyObject_GetAttrStrNoError(type_obj, PYIDENT("__setstate__"));
+            if (!setstate) PyErr_Clear();
+            if (!setstate || __Pyx_setup_reduce_is_named(setstate, PYIDENT("__setstate_cython__"))) {
+                setstate_cython = __Pyx_PyObject_GetAttrStrNoError(type_obj, PYIDENT("__setstate_cython__"));
+                if (likely(setstate_cython)) {
+                    ret = PyDict_SetItem(((PyTypeObject*)type_obj)->tp_dict, PYIDENT("__setstate__"), setstate_cython); if (unlikely(ret < 0)) goto __PYX_BAD;
+                    ret = PyDict_DelItem(((PyTypeObject*)type_obj)->tp_dict, PYIDENT("__setstate_cython__")); if (unlikely(ret < 0)) goto __PYX_BAD;
+                } else if (!setstate || PyErr_Occurred()) {
+                    // Ignore if we're done, i.e. if 'setstate' already has the right name and the original is gone.
+                    // Otherwise: error.
+                    goto __PYX_BAD;
+                }
+            }
+            PyType_Modified((PyTypeObject*)type_obj);
+        }
+    }
+    goto __PYX_GOOD;
+
+__PYX_BAD:
+    if (!PyErr_Occurred()) {
+        __Pyx_TypeName type_obj_name =
+            __Pyx_PyType_GetName((PyTypeObject*)type_obj);
+        PyErr_Format(PyExc_RuntimeError,
+            "Unable to initialize pickling for " __Pyx_FMT_TYPENAME, type_obj_name);
+        __Pyx_DECREF_TypeName(type_obj_name);
+    }
+    ret = -1;
+__PYX_GOOD:
+#if !CYTHON_USE_PYTYPE_LOOKUP
+    Py_XDECREF(object_reduce);
+    Py_XDECREF(object_reduce_ex);
+    Py_XDECREF(object_getstate);
+    Py_XDECREF(getstate);
+#endif
+    Py_XDECREF(reduce);
+    Py_XDECREF(reduce_ex);
+    Py_XDECREF(reduce_cython);
+    Py_XDECREF(setstate);
+    Py_XDECREF(setstate_cython);
+    return ret;
+}
+#endif
+
+
+/////////////// BinopSlot ///////////////
+
+static CYTHON_INLINE PyObject *{{func_name}}_maybe_call_slot(PyTypeObject* type, PyObject *left, PyObject *right {{extra_arg_decl}}) {
+    {{slot_type}} slot;
+#if CYTHON_USE_TYPE_SLOTS || PY_MAJOR_VERSION < 3 || CYTHON_COMPILING_IN_PYPY
+    slot = type->tp_as_number ? type->tp_as_number->{{slot_name}} : NULL;
+#else
+    slot = ({{slot_type}}) PyType_GetSlot(type, Py_{{slot_name}});
+#endif
+    return slot ? slot(left, right {{extra_arg}}) : __Pyx_NewRef(Py_NotImplemented);
+}
+
+static PyObject *{{func_name}}(PyObject *left, PyObject *right {{extra_arg_decl}}) {
+    int maybe_self_is_left, maybe_self_is_right = 0;
+    maybe_self_is_left = Py_TYPE(left) == Py_TYPE(right)
+#if CYTHON_USE_TYPE_SLOTS
+            || (Py_TYPE(left)->tp_as_number && Py_TYPE(left)->tp_as_number->{{slot_name}} == &{{func_name}})
+#endif
+            || __Pyx_TypeCheck(left, {{type_cname}});
+
+    // Optimize for the common case where the left operation is defined (and successful).
+    {{if not overloads_left}}
+    maybe_self_is_right = Py_TYPE(left) == Py_TYPE(right)
+#if CYTHON_USE_TYPE_SLOTS
+            || (Py_TYPE(right)->tp_as_number && Py_TYPE(right)->tp_as_number->{{slot_name}} == &{{func_name}})
+#endif
+            || __Pyx_TypeCheck(right, {{type_cname}});
+    {{endif}}
+
+    if (maybe_self_is_left) {
+        PyObject *res;
+
+        {{if overloads_right and not overloads_left}}
+        if (maybe_self_is_right) {
+            res = {{call_right}};
+            if (res != Py_NotImplemented) return res;
+            Py_DECREF(res);
+            // Don't bother calling it again.
+            maybe_self_is_right = 0;
+        }
+        {{endif}}
+
+        res = {{call_left}};
+        if (res != Py_NotImplemented) return res;
+        Py_DECREF(res);
+    }
+
+    {{if overloads_left}}
+    maybe_self_is_right = Py_TYPE(left) == Py_TYPE(right)
+#if CYTHON_USE_TYPE_SLOTS
+            || (Py_TYPE(right)->tp_as_number && Py_TYPE(right)->tp_as_number->{{slot_name}} == &{{func_name}})
+#endif
+            || PyType_IsSubtype(Py_TYPE(right), {{type_cname}});
+    {{endif}}
+
+    if (maybe_self_is_right) {
+        return {{call_right}};
+    }
+    return __Pyx_NewRef(Py_NotImplemented);
+}
+
+/////////////// ValidateExternBase.proto ///////////////
+
+static int __Pyx_validate_extern_base(PyTypeObject *base); /* proto */
+
+/////////////// ValidateExternBase ///////////////
+//@requires: ObjectHandling.c::FormatTypeName
+
+static int __Pyx_validate_extern_base(PyTypeObject *base) {
+    Py_ssize_t itemsize;
+#if CYTHON_COMPILING_IN_LIMITED_API
+    PyObject *py_itemsize;
+#endif
+#if !CYTHON_COMPILING_IN_LIMITED_API
+    itemsize = ((PyTypeObject *)base)->tp_itemsize;
+#else
+    py_itemsize = PyObject_GetAttrString((PyObject*)base, "__itemsize__");
+    if (!py_itemsize)
+        return -1;
+    itemsize = PyLong_AsSsize_t(py_itemsize);
+    Py_DECREF(py_itemsize);
+    py_itemsize = 0;
+    if (itemsize == (Py_ssize_t)-1 && PyErr_Occurred())
+        return -1;
+#endif
+    if (itemsize) {
+        __Pyx_TypeName b_name = __Pyx_PyType_GetName(base);
+        PyErr_Format(PyExc_TypeError,
+                "inheritance from PyVarObject types like '" __Pyx_FMT_TYPENAME "' not currently supported", b_name);
+        __Pyx_DECREF_TypeName(b_name);
+        return -1;
+    }
+    return 0;
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/FunctionArguments.c b/contrib/tools/cython_py2/Cython/Utility/FunctionArguments.c
new file mode 100644
index 00000000000..961fbc26ef8
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/FunctionArguments.c
@@ -0,0 +1,587 @@
+//////////////////// ArgTypeTest.proto ////////////////////
+
+
+#define __Pyx_ArgTypeTest(obj, type, none_allowed, name, exact) \
+    ((likely(__Pyx_IS_TYPE(obj, type) | (none_allowed && (obj == Py_None)))) ? 1 : \
+        __Pyx__ArgTypeTest(obj, type, name, exact))
+
+static int __Pyx__ArgTypeTest(PyObject *obj, PyTypeObject *type, const char *name, int exact); /*proto*/
+
+//////////////////// ArgTypeTest ////////////////////
+
+static int __Pyx__ArgTypeTest(PyObject *obj, PyTypeObject *type, const char *name, int exact)
+{
+    __Pyx_TypeName type_name;
+    __Pyx_TypeName obj_type_name;
+    if (unlikely(!type)) {
+        PyErr_SetString(PyExc_SystemError, "Missing type object");
+        return 0;
+    }
+    else if (exact) {
+        #if PY_MAJOR_VERSION == 2
+        if ((type == &PyBaseString_Type) && likely(__Pyx_PyBaseString_CheckExact(obj))) return 1;
+        #endif
+    }
+    else {
+        if (likely(__Pyx_TypeCheck(obj, type))) return 1;
+    }
+    type_name = __Pyx_PyType_GetName(type);
+    obj_type_name = __Pyx_PyType_GetName(Py_TYPE(obj));
+    PyErr_Format(PyExc_TypeError,
+        "Argument '%.200s' has incorrect type (expected " __Pyx_FMT_TYPENAME
+        ", got " __Pyx_FMT_TYPENAME ")", name, type_name, obj_type_name);
+    __Pyx_DECREF_TypeName(type_name);
+    __Pyx_DECREF_TypeName(obj_type_name);
+    return 0;
+}
+
+//////////////////// RaiseArgTupleInvalid.proto ////////////////////
+
+static void __Pyx_RaiseArgtupleInvalid(const char* func_name, int exact,
+    Py_ssize_t num_min, Py_ssize_t num_max, Py_ssize_t num_found); /*proto*/
+
+//////////////////// RaiseArgTupleInvalid ////////////////////
+
+//  __Pyx_RaiseArgtupleInvalid raises the correct exception when too
+//  many or too few positional arguments were found.  This handles
+//  Py_ssize_t formatting correctly.
+
+static void __Pyx_RaiseArgtupleInvalid(
+    const char* func_name,
+    int exact,
+    Py_ssize_t num_min,
+    Py_ssize_t num_max,
+    Py_ssize_t num_found)
+{
+    Py_ssize_t num_expected;
+    const char *more_or_less;
+
+    if (num_found < num_min) {
+        num_expected = num_min;
+        more_or_less = "at least";
+    } else {
+        num_expected = num_max;
+        more_or_less = "at most";
+    }
+    if (exact) {
+        more_or_less = "exactly";
+    }
+    PyErr_Format(PyExc_TypeError,
+                 "%.200s() takes %.8s %" CYTHON_FORMAT_SSIZE_T "d positional argument%.1s (%" CYTHON_FORMAT_SSIZE_T "d given)",
+                 func_name, more_or_less, num_expected,
+                 (num_expected == 1) ? "" : "s", num_found);
+}
+
+
+//////////////////// RaiseKeywordRequired.proto ////////////////////
+
+static void __Pyx_RaiseKeywordRequired(const char* func_name, PyObject* kw_name); /*proto*/
+
+//////////////////// RaiseKeywordRequired ////////////////////
+
+static void __Pyx_RaiseKeywordRequired(const char* func_name, PyObject* kw_name) {
+    PyErr_Format(PyExc_TypeError,
+        #if PY_MAJOR_VERSION >= 3
+        "%s() needs keyword-only argument %U", func_name, kw_name);
+        #else
+        "%s() needs keyword-only argument %s", func_name,
+        PyString_AS_STRING(kw_name));
+        #endif
+}
+
+
+//////////////////// RaiseDoubleKeywords.proto ////////////////////
+
+static void __Pyx_RaiseDoubleKeywordsError(const char* func_name, PyObject* kw_name); /*proto*/
+
+//////////////////// RaiseDoubleKeywords ////////////////////
+
+static void __Pyx_RaiseDoubleKeywordsError(
+    const char* func_name,
+    PyObject* kw_name)
+{
+    PyErr_Format(PyExc_TypeError,
+        #if PY_MAJOR_VERSION >= 3
+        "%s() got multiple values for keyword argument '%U'", func_name, kw_name);
+        #else
+        "%s() got multiple values for keyword argument '%s'", func_name,
+        PyString_AsString(kw_name));
+        #endif
+}
+
+
+//////////////////// RaiseMappingExpected.proto ////////////////////
+
+static void __Pyx_RaiseMappingExpectedError(PyObject* arg); /*proto*/
+
+//////////////////// RaiseMappingExpected ////////////////////
+
+static void __Pyx_RaiseMappingExpectedError(PyObject* arg) {
+    __Pyx_TypeName arg_type_name = __Pyx_PyType_GetName(Py_TYPE(arg));
+    PyErr_Format(PyExc_TypeError,
+        "'" __Pyx_FMT_TYPENAME "' object is not a mapping", arg_type_name);
+    __Pyx_DECREF_TypeName(arg_type_name);
+}
+
+
+//////////////////// KeywordStringCheck.proto ////////////////////
+
+static int __Pyx_CheckKeywordStrings(PyObject *kw, const char* function_name, int kw_allowed); /*proto*/
+
+//////////////////// KeywordStringCheck ////////////////////
+
+// __Pyx_CheckKeywordStrings raises an error if non-string keywords
+// were passed to a function, or if any keywords were passed to a
+// function that does not accept them.
+//
+// The "kw" argument is either a dict (for METH_VARARGS) or a tuple
+// (for METH_FASTCALL).
+
+static int __Pyx_CheckKeywordStrings(
+    PyObject *kw,
+    const char* function_name,
+    int kw_allowed)
+{
+    PyObject* key = 0;
+    Py_ssize_t pos = 0;
+#if CYTHON_COMPILING_IN_PYPY
+    /* PyPy appears to check keywords at call time, not at unpacking time => not much to do here */
+    if (!kw_allowed && PyDict_Next(kw, &pos, &key, 0))
+        goto invalid_keyword;
+    return 1;
+#else
+    if (CYTHON_METH_FASTCALL && likely(PyTuple_Check(kw))) {
+        Py_ssize_t kwsize;
+#if CYTHON_ASSUME_SAFE_MACROS
+        kwsize = PyTuple_GET_SIZE(kw);
+#else
+        kwsize = PyTuple_Size(kw);
+        if (kwsize < 0) return 0;
+#endif
+        if (unlikely(kwsize == 0))
+            return 1;
+        if (!kw_allowed) {
+#if CYTHON_ASSUME_SAFE_MACROS
+            key = PyTuple_GET_ITEM(kw, 0);
+#else
+            key = PyTuple_GetItem(kw, pos);
+            if (!key) return 0;
+#endif
+            goto invalid_keyword;
+        }
+#if PY_VERSION_HEX < 0x03090000
+        // On CPython >= 3.9, the FASTCALL protocol guarantees that keyword
+        // names are strings (see https://bugs.python.org/issue37540)
+        for (pos = 0; pos < kwsize; pos++) {
+#if CYTHON_ASSUME_SAFE_MACROS
+            key = PyTuple_GET_ITEM(kw, pos);
+#else
+            key = PyTuple_GetItem(kw, pos);
+            if (!key) return 0;
+#endif
+            if (unlikely(!PyUnicode_Check(key)))
+                goto invalid_keyword_type;
+        }
+#endif
+        return 1;
+    }
+
+    while (PyDict_Next(kw, &pos, &key, 0)) {
+        #if PY_MAJOR_VERSION < 3
+        if (unlikely(!PyString_Check(key)))
+        #endif
+            if (unlikely(!PyUnicode_Check(key)))
+                goto invalid_keyword_type;
+    }
+    if (!kw_allowed && unlikely(key))
+        goto invalid_keyword;
+    return 1;
+invalid_keyword_type:
+    PyErr_Format(PyExc_TypeError,
+        "%.200s() keywords must be strings", function_name);
+    return 0;
+#endif
+invalid_keyword:
+    #if PY_MAJOR_VERSION < 3
+    PyErr_Format(PyExc_TypeError,
+        "%.200s() got an unexpected keyword argument '%.200s'",
+        function_name, PyString_AsString(key));
+    #else
+    PyErr_Format(PyExc_TypeError,
+        "%s() got an unexpected keyword argument '%U'",
+        function_name, key);
+    #endif
+    return 0;
+}
+
+
+//////////////////// ParseKeywords.proto ////////////////////
+
+static int __Pyx_ParseOptionalKeywords(PyObject *kwds, PyObject *const *kwvalues,
+    PyObject **argnames[],
+    PyObject *kwds2, PyObject *values[], Py_ssize_t num_pos_args,
+    const char* function_name); /*proto*/
+
+//////////////////// ParseKeywords ////////////////////
+//@requires: RaiseDoubleKeywords
+
+//  __Pyx_ParseOptionalKeywords copies the optional/unknown keyword
+//  arguments from kwds into the dict kwds2.  If kwds2 is NULL, unknown
+//  keywords will raise an invalid keyword error.
+//
+//  When not using METH_FASTCALL, kwds is a dict and kwvalues is NULL.
+//  Otherwise, kwds is a tuple with keyword names and kwvalues is a C
+//  array with the corresponding values.
+//
+//  Three kinds of errors are checked: 1) non-string keywords, 2)
+//  unexpected keywords and 3) overlap with positional arguments.
+//
+//  If num_posargs is greater 0, it denotes the number of positional
+//  arguments that were passed and that must therefore not appear
+//  amongst the keywords as well.
+//
+//  This method does not check for required keyword arguments.
+
+static int __Pyx_ParseOptionalKeywords(
+    PyObject *kwds,
+    PyObject *const *kwvalues,
+    PyObject **argnames[],
+    PyObject *kwds2,
+    PyObject *values[],
+    Py_ssize_t num_pos_args,
+    const char* function_name)
+{
+    PyObject *key = 0, *value = 0;
+    Py_ssize_t pos = 0;
+    PyObject*** name;
+    PyObject*** first_kw_arg = argnames + num_pos_args;
+    int kwds_is_tuple = CYTHON_METH_FASTCALL && likely(PyTuple_Check(kwds));
+
+    while (1) {
+        // clean up key and value when the loop is "continued"
+        Py_XDECREF(key); key = NULL;
+        Py_XDECREF(value); value = NULL;
+
+        if (kwds_is_tuple) {
+            Py_ssize_t size;
+#if CYTHON_ASSUME_SAFE_MACROS
+            size = PyTuple_GET_SIZE(kwds);
+#else
+            size = PyTuple_Size(kwds);
+            if (size < 0) goto bad;
+#endif
+            if (pos >= size) break;
+
+#if CYTHON_AVOID_BORROWED_REFS
+            // Get an owned reference to key.
+            key = __Pyx_PySequence_ITEM(kwds, pos);
+            if (!key) goto bad;
+#elif CYTHON_ASSUME_SAFE_MACROS
+            key = PyTuple_GET_ITEM(kwds, pos);
+#else
+            key = PyTuple_GetItem(kwds, pos);
+            if (!key) goto bad;
+#endif
+
+            value = kwvalues[pos];
+            pos++;
+        }
+        else
+        {
+            if (!PyDict_Next(kwds, &pos, &key, &value)) break;
+            // It's unfortunately hard to avoid borrowed references (briefly) with PyDict_Next
+#if CYTHON_AVOID_BORROWED_REFS
+            // Own the reference to match the behaviour above.
+            Py_INCREF(key);
+#endif
+        }
+
+        name = first_kw_arg;
+        while (*name && (**name != key)) name++;
+        if (*name) {
+            values[name-argnames] = value;
+#if CYTHON_AVOID_BORROWED_REFS
+            Py_INCREF(value);  /* transfer ownership of value to values */
+            Py_DECREF(key);
+#endif
+            key = NULL;
+            value = NULL;
+            continue;
+        }
+
+        // Now make sure we own both references since we're doing non-trivial Python operations.
+#if !CYTHON_AVOID_BORROWED_REFS
+        Py_INCREF(key);
+#endif
+        Py_INCREF(value);
+
+        name = first_kw_arg;
+        #if PY_MAJOR_VERSION < 3
+        if (likely(PyString_Check(key))) {
+            while (*name) {
+                if ((CYTHON_COMPILING_IN_PYPY || PyString_GET_SIZE(**name) == PyString_GET_SIZE(key))
+                        && _PyString_Eq(**name, key)) {
+                    values[name-argnames] = value;
+#if CYTHON_AVOID_BORROWED_REFS
+                    value = NULL;  /* ownership transferred to values */
+#endif
+                    break;
+                }
+                name++;
+            }
+            if (*name) continue;
+            else {
+                // not found after positional args, check for duplicate
+                PyObject*** argname = argnames;
+                while (argname != first_kw_arg) {
+                    if ((**argname == key) || (
+                            (CYTHON_COMPILING_IN_PYPY || PyString_GET_SIZE(**argname) == PyString_GET_SIZE(key))
+                             && _PyString_Eq(**argname, key))) {
+                        goto arg_passed_twice;
+                    }
+                    argname++;
+                }
+            }
+        } else
+        #endif
+        if (likely(PyUnicode_Check(key))) {
+            while (*name) {
+                int cmp = (
+                #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
+                    (__Pyx_PyUnicode_GET_LENGTH(**name) != __Pyx_PyUnicode_GET_LENGTH(key)) ? 1 :
+                #endif
+                    // In Py2, we may need to convert the argument name from str to unicode for comparison.
+                    PyUnicode_Compare(**name, key)
+                );
+                if (cmp < 0 && unlikely(PyErr_Occurred())) goto bad;
+                if (cmp == 0) {
+                    values[name-argnames] = value;
+#if CYTHON_AVOID_BORROWED_REFS
+                    value = NULL;  /* ownership transferred to values */
+#endif
+                    break;
+                }
+                name++;
+            }
+            if (*name) continue;
+            else {
+                // not found after positional args, check for duplicate
+                PyObject*** argname = argnames;
+                while (argname != first_kw_arg) {
+                    int cmp = (**argname == key) ? 0 :
+                    #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
+                        (__Pyx_PyUnicode_GET_LENGTH(**argname) != __Pyx_PyUnicode_GET_LENGTH(key)) ? 1 :
+                    #endif
+                        // need to convert argument name from bytes to unicode for comparison
+                        PyUnicode_Compare(**argname, key);
+                    if (cmp < 0 && unlikely(PyErr_Occurred())) goto bad;
+                    if (cmp == 0) goto arg_passed_twice;
+                    argname++;
+                }
+            }
+        } else
+            goto invalid_keyword_type;
+
+        if (kwds2) {
+            if (unlikely(PyDict_SetItem(kwds2, key, value))) goto bad;
+        } else {
+            goto invalid_keyword;
+        }
+    }
+    Py_XDECREF(key);
+    Py_XDECREF(value);
+    return 0;
+arg_passed_twice:
+    __Pyx_RaiseDoubleKeywordsError(function_name, key);
+    goto bad;
+invalid_keyword_type:
+    PyErr_Format(PyExc_TypeError,
+        "%.200s() keywords must be strings", function_name);
+    goto bad;
+invalid_keyword:
+    #if PY_MAJOR_VERSION < 3
+    PyErr_Format(PyExc_TypeError,
+        "%.200s() got an unexpected keyword argument '%.200s'",
+        function_name, PyString_AsString(key));
+    #else
+    PyErr_Format(PyExc_TypeError,
+        "%s() got an unexpected keyword argument '%U'",
+        function_name, key);
+    #endif
+bad:
+    Py_XDECREF(key);
+    Py_XDECREF(value);
+    return -1;
+}
+
+
+//////////////////// MergeKeywords.proto ////////////////////
+
+static int __Pyx_MergeKeywords(PyObject *kwdict, PyObject *source_mapping); /*proto*/
+
+//////////////////// MergeKeywords ////////////////////
+//@requires: RaiseDoubleKeywords
+//@requires: Optimize.c::dict_iter
+
+static int __Pyx_MergeKeywords(PyObject *kwdict, PyObject *source_mapping) {
+    PyObject *iter, *key = NULL, *value = NULL;
+    int source_is_dict, result;
+    Py_ssize_t orig_length, ppos = 0;
+
+    iter = __Pyx_dict_iterator(source_mapping, 0, PYIDENT("items"), &orig_length, &source_is_dict);
+    if (unlikely(!iter)) {
+        // slow fallback: try converting to dict, then iterate
+        PyObject *args;
+        if (unlikely(!PyErr_ExceptionMatches(PyExc_AttributeError))) goto bad;
+        PyErr_Clear();
+        args = PyTuple_Pack(1, source_mapping);
+        if (likely(args)) {
+            PyObject *fallback = PyObject_Call((PyObject*)&PyDict_Type, args, NULL);
+            Py_DECREF(args);
+            if (likely(fallback)) {
+                iter = __Pyx_dict_iterator(fallback, 1, PYIDENT("items"), &orig_length, &source_is_dict);
+                Py_DECREF(fallback);
+            }
+        }
+        if (unlikely(!iter)) goto bad;
+    }
+
+    while (1) {
+        result = __Pyx_dict_iter_next(iter, orig_length, &ppos, &key, &value, NULL, source_is_dict);
+        if (unlikely(result < 0)) goto bad;
+        if (!result) break;
+
+        if (unlikely(PyDict_Contains(kwdict, key))) {
+            __Pyx_RaiseDoubleKeywordsError("function", key);
+            result = -1;
+        } else {
+            result = PyDict_SetItem(kwdict, key, value);
+        }
+        Py_DECREF(key);
+        Py_DECREF(value);
+        if (unlikely(result < 0)) goto bad;
+    }
+    Py_XDECREF(iter);
+    return 0;
+
+bad:
+    Py_XDECREF(iter);
+    return -1;
+}
+
+
+/////////////// fastcall.proto ///////////////
+
+// We define various functions and macros with two variants:
+//..._FASTCALL and ..._VARARGS
+
+// The first is used when METH_FASTCALL is enabled and the second is used
+// otherwise. If the Python implementation does not support METH_FASTCALL
+// (because it's an old version of CPython or it's not CPython at all),
+// then the ..._FASTCALL macros simply alias ..._VARARGS
+
+#if CYTHON_AVOID_BORROWED_REFS
+    // This is the only case where we request an owned reference.
+    #define __Pyx_Arg_VARARGS(args, i) PySequence_GetItem(args, i)
+#elif CYTHON_ASSUME_SAFE_MACROS
+    #define __Pyx_Arg_VARARGS(args, i) PyTuple_GET_ITEM(args, i)
+#else
+    #define __Pyx_Arg_VARARGS(args, i) PyTuple_GetItem(args, i)
+#endif
+#if CYTHON_AVOID_BORROWED_REFS
+    #define __Pyx_Arg_NewRef_VARARGS(arg) __Pyx_NewRef(arg)
+    #define __Pyx_Arg_XDECREF_VARARGS(arg) Py_XDECREF(arg)
+#else
+    #define __Pyx_Arg_NewRef_VARARGS(arg) arg  /* no-op */
+    #define __Pyx_Arg_XDECREF_VARARGS(arg)     /* no-op - arg is borrowed */
+#endif
+#define __Pyx_NumKwargs_VARARGS(kwds) PyDict_Size(kwds)
+#define __Pyx_KwValues_VARARGS(args, nargs) NULL
+#define __Pyx_GetKwValue_VARARGS(kw, kwvalues, s) __Pyx_PyDict_GetItemStrWithError(kw, s)
+#define __Pyx_KwargsAsDict_VARARGS(kw, kwvalues) PyDict_Copy(kw)
+#if CYTHON_METH_FASTCALL
+    #define __Pyx_Arg_FASTCALL(args, i) args[i]
+    #define __Pyx_NumKwargs_FASTCALL(kwds) PyTuple_GET_SIZE(kwds)
+    #define __Pyx_KwValues_FASTCALL(args, nargs) ((args) + (nargs))
+    static CYTHON_INLINE PyObject * __Pyx_GetKwValue_FASTCALL(PyObject *kwnames, PyObject *const *kwvalues, PyObject *s);
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030d0000
+    CYTHON_UNUSED static PyObject *__Pyx_KwargsAsDict_FASTCALL(PyObject *kwnames, PyObject *const *kwvalues);/*proto*/
+  #else
+    #define __Pyx_KwargsAsDict_FASTCALL(kw, kwvalues) _PyStack_AsDict(kwvalues, kw)
+  #endif
+    #define __Pyx_Arg_NewRef_FASTCALL(arg) arg  /* no-op, __Pyx_Arg_FASTCALL is direct and this needs
+                                                   to have the same reference counting */
+    #define __Pyx_Arg_XDECREF_FASTCALL(arg)     /* no-op - arg was returned from array */
+#else
+    #define __Pyx_Arg_FASTCALL __Pyx_Arg_VARARGS
+    #define __Pyx_NumKwargs_FASTCALL __Pyx_NumKwargs_VARARGS
+    #define __Pyx_KwValues_FASTCALL __Pyx_KwValues_VARARGS
+    #define __Pyx_GetKwValue_FASTCALL __Pyx_GetKwValue_VARARGS
+    #define __Pyx_KwargsAsDict_FASTCALL __Pyx_KwargsAsDict_VARARGS
+    #define __Pyx_Arg_NewRef_FASTCALL(arg) __Pyx_Arg_NewRef_VARARGS(arg)
+    #define __Pyx_Arg_XDECREF_FASTCALL(arg) __Pyx_Arg_XDECREF_VARARGS(arg)
+#endif
+
+#if CYTHON_COMPILING_IN_CPYTHON && CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+#define __Pyx_ArgsSlice_VARARGS(args, start, stop) __Pyx_PyTuple_FromArray(&__Pyx_Arg_VARARGS(args, start), stop - start)
+#define __Pyx_ArgsSlice_FASTCALL(args, start, stop) __Pyx_PyTuple_FromArray(&__Pyx_Arg_FASTCALL(args, start), stop - start)
+#else
+/* Not CPython, so certainly no METH_FASTCALL support */
+#define __Pyx_ArgsSlice_VARARGS(args, start, stop) PyTuple_GetSlice(args, start, stop)
+#define __Pyx_ArgsSlice_FASTCALL(args, start, stop) PyTuple_GetSlice(args, start, stop)
+#endif
+
+
+/////////////// fastcall ///////////////
+//@requires: ObjectHandling.c::TupleAndListFromArray
+//@requires: StringTools.c::UnicodeEquals
+
+#if CYTHON_METH_FASTCALL
+// kwnames: tuple with names of keyword arguments
+// kwvalues: C array with values of keyword arguments
+// s: str with the keyword name to look for
+static CYTHON_INLINE PyObject * __Pyx_GetKwValue_FASTCALL(PyObject *kwnames, PyObject *const *kwvalues, PyObject *s)
+{
+    // Search the kwnames array for s and return the corresponding value.
+    // We do two loops: a first one to compare pointers (which will find a
+    // match if the name in kwnames is interned, given that s is interned
+    // by Cython). A second loop compares the actual strings.
+    Py_ssize_t i, n = PyTuple_GET_SIZE(kwnames);
+    for (i = 0; i < n; i++)
+    {
+        if (s == PyTuple_GET_ITEM(kwnames, i)) return kwvalues[i];
+    }
+    for (i = 0; i < n; i++)
+    {
+        int eq = __Pyx_PyUnicode_Equals(s, PyTuple_GET_ITEM(kwnames, i), Py_EQ);
+        if (unlikely(eq != 0)) {
+            if (unlikely(eq < 0)) return NULL;  /* error */
+            return kwvalues[i];
+        }
+    }
+    return NULL;  /* not found (no exception set) */
+}
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030d0000
+CYTHON_UNUSED static PyObject *__Pyx_KwargsAsDict_FASTCALL(PyObject *kwnames, PyObject *const *kwvalues) {
+    Py_ssize_t i, nkwargs = PyTuple_GET_SIZE(kwnames);
+    PyObject *dict;
+
+    dict = PyDict_New();
+    if (unlikely(!dict))
+        return NULL;
+
+    for (i=0; i<nkwargs; i++) {
+        PyObject *key = PyTuple_GET_ITEM(kwnames, i);
+        if (unlikely(PyDict_SetItem(dict, key, kwvalues[i]) < 0))
+            goto bad;
+    }
+    return dict;
+
+bad:
+    Py_DECREF(dict);
+    return NULL;
+}
+#endif
+
+#endif
diff --git a/contrib/tools/cython_py2/Cython/Utility/ImportExport.c b/contrib/tools/cython_py2/Cython/Utility/ImportExport.c
new file mode 100644
index 00000000000..18c2cef7db3
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/ImportExport.c
@@ -0,0 +1,939 @@
+/////////////// ImportDottedModule.proto ///////////////
+
+static PyObject *__Pyx_ImportDottedModule(PyObject *name, PyObject *parts_tuple); /*proto*/
+#if PY_MAJOR_VERSION >= 3
+static PyObject *__Pyx_ImportDottedModule_WalkParts(PyObject *module, PyObject *name, PyObject *parts_tuple); /*proto*/
+#endif
+
+/////////////// ImportDottedModule ///////////////
+//@requires: Import
+
+#if PY_MAJOR_VERSION >= 3
+static PyObject *__Pyx__ImportDottedModule_Error(PyObject *name, PyObject *parts_tuple, Py_ssize_t count) {
+    PyObject *partial_name = NULL, *slice = NULL, *sep = NULL;
+    if (unlikely(PyErr_Occurred())) {
+        PyErr_Clear();
+    }
+    if (likely(PyTuple_GET_SIZE(parts_tuple) == count)) {
+        partial_name = name;
+    } else {
+        slice = PySequence_GetSlice(parts_tuple, 0, count);
+        if (unlikely(!slice))
+            goto bad;
+        sep = PyUnicode_FromStringAndSize(".", 1);
+        if (unlikely(!sep))
+            goto bad;
+        partial_name = PyUnicode_Join(sep, slice);
+    }
+
+    PyErr_Format(
+#if PY_MAJOR_VERSION < 3
+        PyExc_ImportError,
+        "No module named '%s'", PyString_AS_STRING(partial_name));
+#else
+#if PY_VERSION_HEX >= 0x030600B1
+        PyExc_ModuleNotFoundError,
+#else
+        PyExc_ImportError,
+#endif
+        "No module named '%U'", partial_name);
+#endif
+
+bad:
+    Py_XDECREF(sep);
+    Py_XDECREF(slice);
+    Py_XDECREF(partial_name);
+    return NULL;
+}
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+static PyObject *__Pyx__ImportDottedModule_Lookup(PyObject *name) {
+    PyObject *imported_module;
+#if PY_VERSION_HEX < 0x030700A1 || (CYTHON_COMPILING_IN_PYPY && PYPY_VERSION_NUM  < 0x07030400)
+    PyObject *modules = PyImport_GetModuleDict();
+    if (unlikely(!modules))
+        return NULL;
+    imported_module = __Pyx_PyDict_GetItemStr(modules, name);
+    Py_XINCREF(imported_module);
+#else
+    imported_module = PyImport_GetModule(name);
+#endif
+    return imported_module;
+}
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+static PyObject *__Pyx_ImportDottedModule_WalkParts(PyObject *module, PyObject *name, PyObject *parts_tuple) {
+    Py_ssize_t i, nparts;
+    nparts = PyTuple_GET_SIZE(parts_tuple);
+    for (i=1; i < nparts && module; i++) {
+        PyObject *part, *submodule;
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+        part = PyTuple_GET_ITEM(parts_tuple, i);
+#else
+        part = PySequence_ITEM(parts_tuple, i);
+#endif
+        submodule = __Pyx_PyObject_GetAttrStrNoError(module, part);
+        // We stop if the attribute isn't found, i.e. if submodule is NULL here.
+#if !(CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS)
+        Py_DECREF(part);
+#endif
+        Py_DECREF(module);
+        module = submodule;
+    }
+    if (unlikely(!module)) {
+        return __Pyx__ImportDottedModule_Error(name, parts_tuple, i);
+    }
+    return module;
+}
+#endif
+
+static PyObject *__Pyx__ImportDottedModule(PyObject *name, PyObject *parts_tuple) {
+#if PY_MAJOR_VERSION < 3
+    PyObject *module, *from_list, *star = PYIDENT("*");
+    CYTHON_UNUSED_VAR(parts_tuple);
+    from_list = PyList_New(1);
+    if (unlikely(!from_list))
+        return NULL;
+    Py_INCREF(star);
+    PyList_SET_ITEM(from_list, 0, star);
+    module = __Pyx_Import(name, from_list, 0);
+    Py_DECREF(from_list);
+    return module;
+#else
+    PyObject *imported_module;
+    PyObject *module = __Pyx_Import(name, NULL, 0);
+    if (!parts_tuple || unlikely(!module))
+        return module;
+
+    // Look up module in sys.modules, which is safer than the attribute lookups below.
+    imported_module = __Pyx__ImportDottedModule_Lookup(name);
+    if (likely(imported_module)) {
+        Py_DECREF(module);
+        return imported_module;
+    }
+    PyErr_Clear();
+    return __Pyx_ImportDottedModule_WalkParts(module, name, parts_tuple);
+#endif
+}
+
+static PyObject *__Pyx_ImportDottedModule(PyObject *name, PyObject *parts_tuple) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030400B1
+    PyObject *module = __Pyx__ImportDottedModule_Lookup(name);
+    if (likely(module)) {
+        // CPython guards against thread-concurrent initialisation in importlib.
+        // In this case, we let PyImport_ImportModuleLevelObject() handle the locking.
+        PyObject *spec = __Pyx_PyObject_GetAttrStrNoError(module, PYIDENT("__spec__"));
+        if (likely(spec)) {
+            PyObject *unsafe = __Pyx_PyObject_GetAttrStrNoError(spec, PYIDENT("_initializing"));
+            if (likely(!unsafe || !__Pyx_PyObject_IsTrue(unsafe))) {
+                Py_DECREF(spec);
+                spec = NULL;
+            }
+            Py_XDECREF(unsafe);
+        }
+        if (likely(!spec)) {
+            // Not in initialisation phase => use modules as is.
+            PyErr_Clear();
+            return module;
+        }
+        Py_DECREF(spec);
+        Py_DECREF(module);
+    } else if (PyErr_Occurred()) {
+        PyErr_Clear();
+    }
+#endif
+
+    return __Pyx__ImportDottedModule(name, parts_tuple);
+}
+
+
+/////////////// ImportDottedModuleRelFirst.proto ///////////////
+
+static PyObject *__Pyx_ImportDottedModuleRelFirst(PyObject *name, PyObject *parts_tuple); /*proto*/
+
+/////////////// ImportDottedModuleRelFirst ///////////////
+//@requires: ImportDottedModule
+//@requires: Import
+
+static PyObject *__Pyx_ImportDottedModuleRelFirst(PyObject *name, PyObject *parts_tuple) {
+    PyObject *module;
+    PyObject *from_list = NULL;
+#if PY_MAJOR_VERSION < 3
+    PyObject *star = PYIDENT("*");
+    from_list = PyList_New(1);
+    if (unlikely(!from_list))
+        return NULL;
+    Py_INCREF(star);
+    PyList_SET_ITEM(from_list, 0, star);
+#endif
+    module = __Pyx_Import(name, from_list, -1);
+    Py_XDECREF(from_list);
+    if (module) {
+        #if PY_MAJOR_VERSION >= 3
+        if (parts_tuple) {
+            module = __Pyx_ImportDottedModule_WalkParts(module, name, parts_tuple);
+        }
+        #endif
+        return module;
+    }
+    if (unlikely(!PyErr_ExceptionMatches(PyExc_ImportError)))
+        return NULL;
+    PyErr_Clear();
+    // try absolute import
+    return __Pyx_ImportDottedModule(name, parts_tuple);
+}
+
+
+/////////////// Import.proto ///////////////
+
+static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, int level); /*proto*/
+
+/////////////// Import ///////////////
+//@requires: ObjectHandling.c::PyObjectGetAttrStr
+//@requires:StringTools.c::IncludeStringH
+//@substitute: naming
+
+static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, int level) {
+    PyObject *module = 0;
+    PyObject *empty_dict = 0;
+    PyObject *empty_list = 0;
+    #if PY_MAJOR_VERSION < 3
+    PyObject *py_import;
+    py_import = __Pyx_PyObject_GetAttrStr($builtins_cname, PYIDENT("__import__"));
+    if (unlikely(!py_import))
+        goto bad;
+    if (!from_list) {
+        empty_list = PyList_New(0);
+        if (unlikely(!empty_list))
+            goto bad;
+        from_list = empty_list;
+    }
+    #endif
+    empty_dict = PyDict_New();
+    if (unlikely(!empty_dict))
+        goto bad;
+    {
+        #if PY_MAJOR_VERSION >= 3
+        if (level == -1) {
+            if (strchr(__Pyx_MODULE_NAME, '.') != NULL) {
+                /* try package relative import first */
+                module = PyImport_ImportModuleLevelObject(
+                    name, $moddict_cname, empty_dict, from_list, 1);
+                if (unlikely(!module)) {
+                    if (unlikely(!PyErr_ExceptionMatches(PyExc_ImportError)))
+                        goto bad;
+                    PyErr_Clear();
+                }
+            }
+            level = 0; /* try absolute import on failure */
+        }
+        #endif
+        if (!module) {
+            #if PY_MAJOR_VERSION < 3
+            PyObject *py_level = PyInt_FromLong(level);
+            if (unlikely(!py_level))
+                goto bad;
+            module = PyObject_CallFunctionObjArgs(py_import,
+                name, $moddict_cname, empty_dict, from_list, py_level, (PyObject *)NULL);
+            Py_DECREF(py_level);
+            #else
+            module = PyImport_ImportModuleLevelObject(
+                name, $moddict_cname, empty_dict, from_list, level);
+            #endif
+        }
+    }
+bad:
+    Py_XDECREF(empty_dict);
+    Py_XDECREF(empty_list);
+    #if PY_MAJOR_VERSION < 3
+    Py_XDECREF(py_import);
+    #endif
+    return module;
+}
+
+
+/////////////// ImportFrom.proto ///////////////
+
+static PyObject* __Pyx_ImportFrom(PyObject* module, PyObject* name); /*proto*/
+
+/////////////// ImportFrom ///////////////
+//@requires: ObjectHandling.c::PyObjectGetAttrStr
+
+static PyObject* __Pyx_ImportFrom(PyObject* module, PyObject* name) {
+    PyObject* value = __Pyx_PyObject_GetAttrStr(module, name);
+    if (unlikely(!value) && PyErr_ExceptionMatches(PyExc_AttributeError)) {
+        // 'name' may refer to a (sub-)module which has not finished initialization
+        // yet, and may not be assigned as an attribute to its parent, so try
+        // finding it by full name.
+        const char* module_name_str = 0;
+        PyObject* module_name = 0;
+        PyObject* module_dot = 0;
+        PyObject* full_name = 0;
+        PyErr_Clear();
+        module_name_str = PyModule_GetName(module);
+        if (unlikely(!module_name_str)) { goto modbad; }
+        module_name = PyUnicode_FromString(module_name_str);
+        if (unlikely(!module_name)) { goto modbad; }
+        module_dot = PyUnicode_Concat(module_name, PYUNICODE("."));
+        if (unlikely(!module_dot)) { goto modbad; }
+        full_name = PyUnicode_Concat(module_dot, name);
+        if (unlikely(!full_name)) { goto modbad; }
+        #if PY_VERSION_HEX < 0x030700A1 || (CYTHON_COMPILING_IN_PYPY && PYPY_VERSION_NUM  < 0x07030400)
+        {
+            PyObject *modules = PyImport_GetModuleDict();
+            if (unlikely(!modules))
+                goto modbad;
+            value = PyObject_GetItem(modules, full_name);
+        }
+        #else
+        value = PyImport_GetModule(full_name);
+        #endif
+
+      modbad:
+        Py_XDECREF(full_name);
+        Py_XDECREF(module_dot);
+        Py_XDECREF(module_name);
+    }
+    if (unlikely(!value)) {
+        PyErr_Format(PyExc_ImportError,
+        #if PY_MAJOR_VERSION < 3
+            "cannot import name %.230s", PyString_AS_STRING(name));
+        #else
+            "cannot import name %S", name);
+        #endif
+    }
+    return value;
+}
+
+
+/////////////// ImportStar ///////////////
+//@substitute: naming
+
+/* import_all_from is an unexposed function from ceval.c */
+
+static int
+__Pyx_import_all_from(PyObject *locals, PyObject *v)
+{
+    PyObject *all = PyObject_GetAttrString(v, "__all__");
+    PyObject *dict, *name, *value;
+    int skip_leading_underscores = 0;
+    int pos, err;
+
+    if (all == NULL) {
+        if (!PyErr_ExceptionMatches(PyExc_AttributeError))
+            return -1; /* Unexpected error */
+        PyErr_Clear();
+        dict = PyObject_GetAttrString(v, "__dict__");
+        if (dict == NULL) {
+            if (!PyErr_ExceptionMatches(PyExc_AttributeError))
+                return -1;
+            PyErr_SetString(PyExc_ImportError,
+            "from-import-* object has no __dict__ and no __all__");
+            return -1;
+        }
+#if PY_MAJOR_VERSION < 3
+        all = PyObject_CallMethod(dict, (char *)"keys", NULL);
+#else
+        all = PyMapping_Keys(dict);
+#endif
+        Py_DECREF(dict);
+        if (all == NULL)
+            return -1;
+        skip_leading_underscores = 1;
+    }
+
+    for (pos = 0, err = 0; ; pos++) {
+        name = PySequence_GetItem(all, pos);
+        if (name == NULL) {
+            if (!PyErr_ExceptionMatches(PyExc_IndexError))
+                err = -1;
+            else
+                PyErr_Clear();
+            break;
+        }
+        if (skip_leading_underscores &&
+#if PY_MAJOR_VERSION < 3
+            likely(PyString_Check(name)) &&
+            PyString_AS_STRING(name)[0] == '_')
+#else
+            likely(PyUnicode_Check(name)) &&
+            likely(__Pyx_PyUnicode_GET_LENGTH(name)) &&
+            __Pyx_PyUnicode_READ_CHAR(name, 0) == '_')
+#endif
+        {
+            Py_DECREF(name);
+            continue;
+        }
+        value = PyObject_GetAttr(v, name);
+        if (value == NULL)
+            err = -1;
+        else if (PyDict_CheckExact(locals))
+            err = PyDict_SetItem(locals, name, value);
+        else
+            err = PyObject_SetItem(locals, name, value);
+        Py_DECREF(name);
+        Py_XDECREF(value);
+        if (err != 0)
+            break;
+    }
+    Py_DECREF(all);
+    return err;
+}
+
+
+static int ${import_star}(PyObject* m) {
+
+    int i;
+    int ret = -1;
+    char* s;
+    PyObject *locals = 0;
+    PyObject *list = 0;
+#if PY_MAJOR_VERSION >= 3
+    PyObject *utf8_name = 0;
+#endif
+    PyObject *name;
+    PyObject *item;
+
+    locals = PyDict_New();              if (!locals) goto bad;
+    if (__Pyx_import_all_from(locals, m) < 0) goto bad;
+    list = PyDict_Items(locals);        if (!list) goto bad;
+
+    for(i=0; i<PyList_GET_SIZE(list); i++) {
+        name = PyTuple_GET_ITEM(PyList_GET_ITEM(list, i), 0);
+        item = PyTuple_GET_ITEM(PyList_GET_ITEM(list, i), 1);
+#if PY_MAJOR_VERSION >= 3
+        utf8_name = PyUnicode_AsUTF8String(name);
+        if (!utf8_name) goto bad;
+        s = PyBytes_AS_STRING(utf8_name);
+        if (${import_star_set}(item, name, s) < 0) goto bad;
+        Py_DECREF(utf8_name); utf8_name = 0;
+#else
+        s = PyString_AsString(name);
+        if (!s) goto bad;
+        if (${import_star_set}(item, name, s) < 0) goto bad;
+#endif
+    }
+    ret = 0;
+
+bad:
+    Py_XDECREF(locals);
+    Py_XDECREF(list);
+#if PY_MAJOR_VERSION >= 3
+    Py_XDECREF(utf8_name);
+#endif
+    return ret;
+}
+
+
+/////////////// SetPackagePathFromImportLib.proto ///////////////
+
+// PY_VERSION_HEX >= 0x03030000
+#if PY_MAJOR_VERSION >= 3 && !CYTHON_PEP489_MULTI_PHASE_INIT
+static int __Pyx_SetPackagePathFromImportLib(PyObject *module_name);
+#else
+#define __Pyx_SetPackagePathFromImportLib(a) 0
+#endif
+
+/////////////// SetPackagePathFromImportLib ///////////////
+//@substitute: naming
+
+// PY_VERSION_HEX >= 0x03030000
+#if PY_MAJOR_VERSION >= 3 && !CYTHON_PEP489_MULTI_PHASE_INIT
+static int __Pyx_SetPackagePathFromImportLib(PyObject *module_name) {
+    PyObject *importlib, *osmod, *ossep, *parts, *package_path;
+    PyObject *file_path = NULL;
+    int result;
+    PyObject *spec;
+    // package_path = [importlib.util.find_spec(module_name).origin.rsplit(os.sep, 1)[0]]
+    importlib = PyImport_ImportModule("importlib.util");
+    if (unlikely(!importlib))
+        goto bad;
+    spec = PyObject_CallMethod(importlib, "find_spec", "(O)", module_name);
+    Py_DECREF(importlib);
+    if (unlikely(!spec))
+        goto bad;
+    file_path = PyObject_GetAttrString(spec, "origin");
+    Py_DECREF(spec);
+    if (unlikely(!file_path))
+        goto bad;
+
+    if (unlikely(PyObject_SetAttrString($module_cname, "__file__", file_path) < 0))
+        goto bad;
+
+    osmod = PyImport_ImportModule("os");
+    if (unlikely(!osmod))
+        goto bad;
+    ossep = PyObject_GetAttrString(osmod, "sep");
+    Py_DECREF(osmod);
+    if (unlikely(!ossep))
+        goto bad;
+    parts = PyObject_CallMethod(file_path, "rsplit", "(Oi)", ossep, 1);
+    Py_DECREF(file_path); file_path = NULL;
+    Py_DECREF(ossep);
+    if (unlikely(!parts))
+        goto bad;
+    package_path = Py_BuildValue("[O]", PyList_GET_ITEM(parts, 0));
+    Py_DECREF(parts);
+    if (unlikely(!package_path))
+        goto bad;
+    goto set_path;
+
+bad:
+    PyErr_WriteUnraisable(module_name);
+    Py_XDECREF(file_path);
+
+    // set an empty path list on failure
+    PyErr_Clear();
+    package_path = PyList_New(0);
+    if (unlikely(!package_path))
+        return -1;
+
+set_path:
+    result = PyObject_SetAttrString($module_cname, "__path__", package_path);
+    Py_DECREF(package_path);
+    return result;
+}
+#endif
+
+
+/////////////// TypeImport.proto ///////////////
+//@substitute: naming
+
+#ifndef __PYX_HAVE_RT_ImportType_proto_$cyversion
+#define __PYX_HAVE_RT_ImportType_proto_$cyversion
+
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+#include <stdalign.h>
+#endif
+
+#if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || __cplusplus >= 201103L
+#define __PYX_GET_STRUCT_ALIGNMENT_$cyversion(s) alignof(s)
+#else
+// best guess at what the alignment could be since we can't measure it
+#define __PYX_GET_STRUCT_ALIGNMENT_$cyversion(s) sizeof(void*)
+#endif
+
+enum __Pyx_ImportType_CheckSize_$cyversion {
+   __Pyx_ImportType_CheckSize_Error_$cyversion = 0,
+   __Pyx_ImportType_CheckSize_Warn_$cyversion = 1,
+   __Pyx_ImportType_CheckSize_Ignore_$cyversion = 2
+};
+
+static PyTypeObject *__Pyx_ImportType_$cyversion(PyObject* module, const char *module_name, const char *class_name, size_t size, size_t alignment, enum __Pyx_ImportType_CheckSize_$cyversion check_size);  /*proto*/
+
+#endif
+
+/////////////// TypeImport ///////////////
+//@substitute: naming
+
+#ifndef __PYX_HAVE_RT_ImportType_$cyversion
+#define __PYX_HAVE_RT_ImportType_$cyversion
+static PyTypeObject *__Pyx_ImportType_$cyversion(PyObject *module, const char *module_name, const char *class_name,
+    size_t size, size_t alignment, enum __Pyx_ImportType_CheckSize_$cyversion check_size)
+{
+    PyObject *result = 0;
+    char warning[200];
+    Py_ssize_t basicsize;
+    Py_ssize_t itemsize;
+#if CYTHON_COMPILING_IN_LIMITED_API
+    PyObject *py_basicsize;
+    PyObject *py_itemsize;
+#endif
+
+    result = PyObject_GetAttrString(module, class_name);
+    if (!result)
+        goto bad;
+    if (!PyType_Check(result)) {
+        PyErr_Format(PyExc_TypeError,
+            "%.200s.%.200s is not a type object",
+            module_name, class_name);
+        goto bad;
+    }
+#if !CYTHON_COMPILING_IN_LIMITED_API
+    basicsize = ((PyTypeObject *)result)->tp_basicsize;
+    itemsize = ((PyTypeObject *)result)->tp_itemsize;
+#else
+    py_basicsize = PyObject_GetAttrString(result, "__basicsize__");
+    if (!py_basicsize)
+        goto bad;
+    basicsize = PyLong_AsSsize_t(py_basicsize);
+    Py_DECREF(py_basicsize);
+    py_basicsize = 0;
+    if (basicsize == (Py_ssize_t)-1 && PyErr_Occurred())
+        goto bad;
+    py_itemsize = PyObject_GetAttrString(result, "__itemsize__");
+    if (!py_itemsize)
+        goto bad;
+    itemsize = PyLong_AsSsize_t(py_itemsize);
+    Py_DECREF(py_itemsize);
+    py_itemsize = 0;
+    if (itemsize == (Py_ssize_t)-1 && PyErr_Occurred())
+        goto bad;
+#endif
+    if (itemsize) {
+        // If itemsize is smaller than the alignment the struct can end up with some extra
+        // padding at the end. In this case we need to work out the maximum size that
+        // the padding could be when calculating the range of valid struct sizes.
+        if (size % alignment) {
+            // if this is true we've probably calculated the alignment wrongly
+            // (most likely because alignof isn't available)
+            alignment = size % alignment;
+        }
+        if (itemsize < (Py_ssize_t)alignment)
+            itemsize = (Py_ssize_t)alignment;
+    }
+    if ((size_t)(basicsize + itemsize) < size) {
+        PyErr_Format(PyExc_ValueError,
+            "%.200s.%.200s size changed, may indicate binary incompatibility. "
+            "Expected %zd from C header, got %zd from PyObject",
+            module_name, class_name, size, basicsize+itemsize);
+        goto bad;
+    }
+    // varobjects almost have structs  between basicsize and basicsize + itemsize
+    // but the struct isn't always one of the two limiting values
+    if (check_size == __Pyx_ImportType_CheckSize_Error_$cyversion &&
+            ((size_t)basicsize > size || (size_t)(basicsize + itemsize) < size)) {
+        PyErr_Format(PyExc_ValueError,
+            "%.200s.%.200s size changed, may indicate binary incompatibility. "
+            "Expected %zd from C header, got %zd-%zd from PyObject",
+            module_name, class_name, size, basicsize, basicsize+itemsize);
+        goto bad;
+    }
+    else if (check_size == __Pyx_ImportType_CheckSize_Warn_$cyversion && (size_t)basicsize > size) {
+        PyOS_snprintf(warning, sizeof(warning),
+            "%s.%s size changed, may indicate binary incompatibility. "
+            "Expected %zd from C header, got %zd from PyObject",
+            module_name, class_name, size, basicsize);
+        if (PyErr_WarnEx(NULL, warning, 0) < 0) goto bad;
+    }
+    /* check_size == __Pyx_ImportType_CheckSize_Ignore does not warn nor error */
+    return (PyTypeObject *)result;
+bad:
+    Py_XDECREF(result);
+    return NULL;
+}
+#endif
+
+/////////////// FunctionImport.proto ///////////////
+//@substitute: naming
+
+static int __Pyx_ImportFunction_$cyversion(PyObject *module, const char *funcname, void (**f)(void), const char *sig); /*proto*/
+
+/////////////// FunctionImport ///////////////
+//@substitute: naming
+
+#ifndef __PYX_HAVE_RT_ImportFunction_$cyversion
+#define __PYX_HAVE_RT_ImportFunction_$cyversion
+static int __Pyx_ImportFunction_$cyversion(PyObject *module, const char *funcname, void (**f)(void), const char *sig) {
+    PyObject *d = 0;
+    PyObject *cobj = 0;
+    union {
+        void (*fp)(void);
+        void *p;
+    } tmp;
+
+    d = PyObject_GetAttrString(module, (char *)"$api_name");
+    if (!d)
+        goto bad;
+    cobj = PyDict_GetItemString(d, funcname);
+    if (!cobj) {
+        PyErr_Format(PyExc_ImportError,
+            "%.200s does not export expected C function %.200s",
+                PyModule_GetName(module), funcname);
+        goto bad;
+    }
+    if (!PyCapsule_IsValid(cobj, sig)) {
+        PyErr_Format(PyExc_TypeError,
+            "C function %.200s.%.200s has wrong signature (expected %.500s, got %.500s)",
+             PyModule_GetName(module), funcname, sig, PyCapsule_GetName(cobj));
+        goto bad;
+    }
+    tmp.p = PyCapsule_GetPointer(cobj, sig);
+    *f = tmp.fp;
+    if (!(*f))
+        goto bad;
+    Py_DECREF(d);
+    return 0;
+bad:
+    Py_XDECREF(d);
+    return -1;
+}
+#endif
+
+/////////////// FunctionExport.proto ///////////////
+
+static int __Pyx_ExportFunction(const char *name, void (*f)(void), const char *sig); /*proto*/
+
+/////////////// FunctionExport ///////////////
+//@substitute: naming
+
+static int __Pyx_ExportFunction(const char *name, void (*f)(void), const char *sig) {
+    PyObject *d = 0;
+    PyObject *cobj = 0;
+    union {
+        void (*fp)(void);
+        void *p;
+    } tmp;
+
+    d = PyObject_GetAttrString($module_cname, (char *)"$api_name");
+    if (!d) {
+        PyErr_Clear();
+        d = PyDict_New();
+        if (!d)
+            goto bad;
+        Py_INCREF(d);
+        if (PyModule_AddObject($module_cname, (char *)"$api_name", d) < 0)
+            goto bad;
+    }
+    tmp.fp = f;
+    cobj = PyCapsule_New(tmp.p, sig, 0);
+    if (!cobj)
+        goto bad;
+    if (PyDict_SetItemString(d, name, cobj) < 0)
+        goto bad;
+    Py_DECREF(cobj);
+    Py_DECREF(d);
+    return 0;
+bad:
+    Py_XDECREF(cobj);
+    Py_XDECREF(d);
+    return -1;
+}
+
+/////////////// VoidPtrImport.proto ///////////////
+//@substitute: naming
+
+static int __Pyx_ImportVoidPtr_$cyversion(PyObject *module, const char *name, void **p, const char *sig); /*proto*/
+
+/////////////// VoidPtrImport ///////////////
+//@substitute: naming
+
+#ifndef __PYX_HAVE_RT_ImportVoidPtr_$cyversion
+#define __PYX_HAVE_RT_ImportVoidPtr_$cyversion
+static int __Pyx_ImportVoidPtr_$cyversion(PyObject *module, const char *name, void **p, const char *sig) {
+    PyObject *d = 0;
+    PyObject *cobj = 0;
+
+    d = PyObject_GetAttrString(module, (char *)"$api_name");
+    if (!d)
+        goto bad;
+    cobj = PyDict_GetItemString(d, name);
+    if (!cobj) {
+        PyErr_Format(PyExc_ImportError,
+            "%.200s does not export expected C variable %.200s",
+                PyModule_GetName(module), name);
+        goto bad;
+    }
+    if (!PyCapsule_IsValid(cobj, sig)) {
+        PyErr_Format(PyExc_TypeError,
+            "C variable %.200s.%.200s has wrong signature (expected %.500s, got %.500s)",
+             PyModule_GetName(module), name, sig, PyCapsule_GetName(cobj));
+        goto bad;
+    }
+    *p = PyCapsule_GetPointer(cobj, sig);
+    if (!(*p))
+        goto bad;
+    Py_DECREF(d);
+    return 0;
+bad:
+    Py_XDECREF(d);
+    return -1;
+}
+#endif
+
+/////////////// VoidPtrExport.proto ///////////////
+
+static int __Pyx_ExportVoidPtr(PyObject *name, void *p, const char *sig); /*proto*/
+
+/////////////// VoidPtrExport ///////////////
+//@substitute: naming
+//@requires: ObjectHandling.c::PyObjectSetAttrStr
+
+static int __Pyx_ExportVoidPtr(PyObject *name, void *p, const char *sig) {
+    PyObject *d;
+    PyObject *cobj = 0;
+
+    d = PyDict_GetItem($moddict_cname, PYIDENT("$api_name"));
+    Py_XINCREF(d);
+    if (!d) {
+        d = PyDict_New();
+        if (!d)
+            goto bad;
+        if (__Pyx_PyObject_SetAttrStr($module_cname, PYIDENT("$api_name"), d) < 0)
+            goto bad;
+    }
+    cobj = PyCapsule_New(p, sig, 0);
+    if (!cobj)
+        goto bad;
+    if (PyDict_SetItem(d, name, cobj) < 0)
+        goto bad;
+    Py_DECREF(cobj);
+    Py_DECREF(d);
+    return 0;
+bad:
+    Py_XDECREF(cobj);
+    Py_XDECREF(d);
+    return -1;
+}
+
+
+/////////////// SetVTable.proto ///////////////
+
+static int __Pyx_SetVtable(PyTypeObject* typeptr , void* vtable); /*proto*/
+
+/////////////// SetVTable ///////////////
+
+static int __Pyx_SetVtable(PyTypeObject *type, void *vtable) {
+    PyObject *ob = PyCapsule_New(vtable, 0, 0);
+    if (unlikely(!ob))
+        goto bad;
+#if CYTHON_COMPILING_IN_LIMITED_API
+    if (unlikely(PyObject_SetAttr((PyObject *) type, PYIDENT("__pyx_vtable__"), ob) < 0))
+#else
+    if (unlikely(PyDict_SetItem(type->tp_dict, PYIDENT("__pyx_vtable__"), ob) < 0))
+#endif
+        goto bad;
+    Py_DECREF(ob);
+    return 0;
+bad:
+    Py_XDECREF(ob);
+    return -1;
+}
+
+
+/////////////// GetVTable.proto ///////////////
+
+static void* __Pyx_GetVtable(PyTypeObject *type); /*proto*/
+
+/////////////// GetVTable ///////////////
+
+static void* __Pyx_GetVtable(PyTypeObject *type) {
+    void* ptr;
+#if CYTHON_COMPILING_IN_LIMITED_API
+    PyObject *ob = PyObject_GetAttr((PyObject *)type, PYIDENT("__pyx_vtable__"));
+#else
+    PyObject *ob = PyObject_GetItem(type->tp_dict, PYIDENT("__pyx_vtable__"));
+#endif
+    if (!ob)
+        goto bad;
+    ptr = PyCapsule_GetPointer(ob, 0);
+    if (!ptr && !PyErr_Occurred())
+        PyErr_SetString(PyExc_RuntimeError, "invalid vtable found for imported type");
+    Py_DECREF(ob);
+    return ptr;
+bad:
+    Py_XDECREF(ob);
+    return NULL;
+}
+
+
+/////////////// MergeVTables.proto ///////////////
+//@requires: GetVTable
+
+// TODO: find a way to make this work with the Limited API!
+#if !CYTHON_COMPILING_IN_LIMITED_API
+static int __Pyx_MergeVtables(PyTypeObject *type); /*proto*/
+#endif
+
+/////////////// MergeVTables ///////////////
+
+#if !CYTHON_COMPILING_IN_LIMITED_API
+static int __Pyx_MergeVtables(PyTypeObject *type) {
+    int i;
+    void** base_vtables;
+    __Pyx_TypeName tp_base_name;
+    __Pyx_TypeName base_name;
+    void* unknown = (void*)-1;
+    PyObject* bases = type->tp_bases;
+    int base_depth = 0;
+    {
+        PyTypeObject* base = type->tp_base;
+        while (base) {
+            base_depth += 1;
+            base = base->tp_base;
+        }
+    }
+    base_vtables = (void**) malloc(sizeof(void*) * (size_t)(base_depth + 1));
+    base_vtables[0] = unknown;
+    // Could do MRO resolution of individual methods in the future, assuming
+    // compatible vtables, but for now simply require a common vtable base.
+    // Note that if the vtables of various bases are extended separately,
+    // resolution isn't possible and we must reject it just as when the
+    // instance struct is so extended.  (It would be good to also do this
+    // check when a multiple-base class is created in pure Python as well.)
+    for (i = 1; i < PyTuple_GET_SIZE(bases); i++) {
+        void* base_vtable = __Pyx_GetVtable(((PyTypeObject*)PyTuple_GET_ITEM(bases, i)));
+        if (base_vtable != NULL) {
+            int j;
+            PyTypeObject* base = type->tp_base;
+            for (j = 0; j < base_depth; j++) {
+                if (base_vtables[j] == unknown) {
+                    base_vtables[j] = __Pyx_GetVtable(base);
+                    base_vtables[j + 1] = unknown;
+                }
+                if (base_vtables[j] == base_vtable) {
+                    break;
+                } else if (base_vtables[j] == NULL) {
+                    // No more potential matching bases (with vtables).
+                    goto bad;
+                }
+                base = base->tp_base;
+            }
+        }
+    }
+    PyErr_Clear();
+    free(base_vtables);
+    return 0;
+bad:
+    tp_base_name = __Pyx_PyType_GetName(type->tp_base);
+    base_name = __Pyx_PyType_GetName((PyTypeObject*)PyTuple_GET_ITEM(bases, i));
+    PyErr_Format(PyExc_TypeError,
+        "multiple bases have vtable conflict: '" __Pyx_FMT_TYPENAME "' and '" __Pyx_FMT_TYPENAME "'", tp_base_name, base_name);
+    __Pyx_DECREF_TypeName(tp_base_name);
+    __Pyx_DECREF_TypeName(base_name);
+    free(base_vtables);
+    return -1;
+}
+#endif
+
+
+/////////////// ImportNumPyArray.proto ///////////////
+
+static PyObject *__pyx_numpy_ndarray = NULL;
+
+static PyObject* __Pyx_ImportNumPyArrayTypeIfAvailable(void); /*proto*/
+
+/////////////// ImportNumPyArray.cleanup ///////////////
+Py_CLEAR(__pyx_numpy_ndarray);
+
+/////////////// ImportNumPyArray ///////////////
+//@requires: ImportExport.c::Import
+
+static PyObject* __Pyx__ImportNumPyArray(void) {
+    PyObject *numpy_module, *ndarray_object = NULL;
+    numpy_module = __Pyx_Import(PYIDENT("numpy"), NULL, 0);
+    if (likely(numpy_module)) {
+        ndarray_object = PyObject_GetAttrString(numpy_module, "ndarray");
+        Py_DECREF(numpy_module);
+    }
+    if (unlikely(!ndarray_object)) {
+        // ImportError, AttributeError, ...
+        PyErr_Clear();
+    }
+    if (unlikely(!ndarray_object || !PyObject_TypeCheck(ndarray_object, &PyType_Type))) {
+        Py_XDECREF(ndarray_object);
+        Py_INCREF(Py_None);
+        ndarray_object = Py_None;
+    }
+    return ndarray_object;
+}
+
+static CYTHON_INLINE PyObject* __Pyx_ImportNumPyArrayTypeIfAvailable(void) {
+    if (unlikely(!__pyx_numpy_ndarray)) {
+        __pyx_numpy_ndarray = __Pyx__ImportNumPyArray();
+    }
+    Py_INCREF(__pyx_numpy_ndarray);
+    return __pyx_numpy_ndarray;
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/MemoryView.pyx b/contrib/tools/cython_py2/Cython/Utility/MemoryView.pyx
new file mode 100644
index 00000000000..b84c05d3360
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/MemoryView.pyx
@@ -0,0 +1,1481 @@
+#################### View.MemoryView ####################
+
+# cython: language_level=3str
+# cython: binding=False
+
+# This utility provides cython.array and cython.view.memoryview
+
+from __future__ import absolute_import
+
+cimport cython
+
+# from cpython cimport ...
+cdef extern from "Python.h":
+    ctypedef struct PyObject
+    int PyIndex_Check(object)
+    PyObject *PyExc_IndexError
+    PyObject *PyExc_ValueError
+
+cdef extern from "pythread.h":
+    ctypedef void *PyThread_type_lock
+
+    PyThread_type_lock PyThread_allocate_lock()
+    void PyThread_free_lock(PyThread_type_lock)
+
+cdef extern from "<string.h>":
+    void *memset(void *b, int c, size_t len)
+
+cdef extern from *:
+    bint __PYX_CYTHON_ATOMICS_ENABLED()
+    int __Pyx_GetBuffer(object, Py_buffer *, int) except -1
+    void __Pyx_ReleaseBuffer(Py_buffer *)
+
+    ctypedef struct PyObject
+    ctypedef Py_ssize_t Py_intptr_t
+    void Py_INCREF(PyObject *)
+    void Py_DECREF(PyObject *)
+
+    void* PyMem_Malloc(size_t n)
+    void PyMem_Free(void *p)
+    void* PyObject_Malloc(size_t n)
+    void PyObject_Free(void *p)
+
+    cdef struct __pyx_memoryview "__pyx_memoryview_obj":
+        Py_buffer view
+        PyObject *obj
+        __Pyx_TypeInfo *typeinfo
+
+    ctypedef struct {{memviewslice_name}}:
+        __pyx_memoryview *memview
+        char *data
+        Py_ssize_t shape[{{max_dims}}]
+        Py_ssize_t strides[{{max_dims}}]
+        Py_ssize_t suboffsets[{{max_dims}}]
+
+    void __PYX_INC_MEMVIEW({{memviewslice_name}} *memslice, int have_gil)
+    void __PYX_XCLEAR_MEMVIEW({{memviewslice_name}} *memslice, int have_gil)
+
+    ctypedef struct __pyx_buffer "Py_buffer":
+        PyObject *obj
+
+    PyObject *Py_None
+
+    cdef enum:
+        PyBUF_C_CONTIGUOUS,
+        PyBUF_F_CONTIGUOUS,
+        PyBUF_ANY_CONTIGUOUS
+        PyBUF_FORMAT
+        PyBUF_WRITABLE
+        PyBUF_STRIDES
+        PyBUF_INDIRECT
+        PyBUF_ND
+        PyBUF_RECORDS
+        PyBUF_RECORDS_RO
+
+    ctypedef struct __Pyx_TypeInfo:
+        pass
+
+cdef extern from *:
+    ctypedef int __pyx_atomic_int_type
+    {{memviewslice_name}} slice_copy_contig "__pyx_memoryview_copy_new_contig"(
+                                 __Pyx_memviewslice *from_mvs,
+                                 char *mode, int ndim,
+                                 size_t sizeof_dtype, int contig_flag,
+                                 bint dtype_is_object) except * nogil
+    bint slice_is_contig "__pyx_memviewslice_is_contig" (
+                            {{memviewslice_name}} mvs, char order, int ndim) nogil
+    bint slices_overlap "__pyx_slices_overlap" ({{memviewslice_name}} *slice1,
+                                                {{memviewslice_name}} *slice2,
+                                                int ndim, size_t itemsize) nogil
+
+
+cdef extern from "<stdlib.h>":
+    void *malloc(size_t) nogil
+    void free(void *) nogil
+    void *memcpy(void *dest, void *src, size_t n) nogil
+
+# the sequence abstract base class
+cdef object __pyx_collections_abc_Sequence "__pyx_collections_abc_Sequence"
+try:
+    if __import__("sys").version_info >= (3, 3):
+        __pyx_collections_abc_Sequence = __import__("collections.abc").abc.Sequence
+    else:
+        __pyx_collections_abc_Sequence = __import__("collections").Sequence
+except:
+    # it isn't a big problem if this fails
+    __pyx_collections_abc_Sequence = None
+
+#
+### cython.array class
+#
+
+[email protected]_type("sequence")
+@cname("__pyx_array")
+cdef class array:
+
+    cdef:
+        char *data
+        Py_ssize_t len
+        char *format
+        int ndim
+        Py_ssize_t *_shape
+        Py_ssize_t *_strides
+        Py_ssize_t itemsize
+        unicode mode  # FIXME: this should have been a simple 'char'
+        bytes _format
+        void (*callback_free_data)(void *data) noexcept
+        # cdef object _memview
+        cdef bint free_data
+        cdef bint dtype_is_object
+
+    def __cinit__(array self, tuple shape, Py_ssize_t itemsize, format not None,
+                  mode="c", bint allocate_buffer=True):
+
+        cdef int idx
+        cdef Py_ssize_t dim
+
+        self.ndim = <int> len(shape)
+        self.itemsize = itemsize
+
+        if not self.ndim:
+            raise ValueError, "Empty shape tuple for cython.array"
+
+        if itemsize <= 0:
+            raise ValueError, "itemsize <= 0 for cython.array"
+
+        if not isinstance(format, bytes):
+            format = format.encode('ASCII')
+        self._format = format  # keep a reference to the byte string
+        self.format = self._format
+
+        # use single malloc() for both shape and strides
+        self._shape = <Py_ssize_t *> PyObject_Malloc(sizeof(Py_ssize_t)*self.ndim*2)
+        self._strides = self._shape + self.ndim
+
+        if not self._shape:
+            raise MemoryError, "unable to allocate shape and strides."
+
+        # cdef Py_ssize_t dim, stride
+        for idx, dim in enumerate(shape):
+            if dim <= 0:
+                raise ValueError, f"Invalid shape in axis {idx}: {dim}."
+            self._shape[idx] = dim
+
+        cdef char order
+        if mode == 'c':
+            order = b'C'
+            self.mode = u'c'
+        elif mode == 'fortran':
+            order = b'F'
+            self.mode = u'fortran'
+        else:
+            raise ValueError, f"Invalid mode, expected 'c' or 'fortran', got {mode}"
+
+        self.len = fill_contig_strides_array(self._shape, self._strides, itemsize, self.ndim, order)
+
+        self.free_data = allocate_buffer
+        self.dtype_is_object = format == b'O'
+
+        if allocate_buffer:
+            _allocate_buffer(self)
+
+    @cname('getbuffer')
+    def __getbuffer__(self, Py_buffer *info, int flags):
+        cdef int bufmode = -1
+        if flags & (PyBUF_C_CONTIGUOUS | PyBUF_F_CONTIGUOUS | PyBUF_ANY_CONTIGUOUS):
+            if self.mode == u"c":
+                bufmode = PyBUF_C_CONTIGUOUS | PyBUF_ANY_CONTIGUOUS
+            elif self.mode == u"fortran":
+                bufmode = PyBUF_F_CONTIGUOUS | PyBUF_ANY_CONTIGUOUS
+            if not (flags & bufmode):
+                raise ValueError, "Can only create a buffer that is contiguous in memory."
+        info.buf = self.data
+        info.len = self.len
+
+        if flags & PyBUF_STRIDES:
+            info.ndim = self.ndim
+            info.shape = self._shape
+            info.strides = self._strides
+        else:
+            info.ndim = 1
+            info.shape = &self.len if flags & PyBUF_ND else NULL
+            info.strides = NULL
+
+        info.suboffsets = NULL
+        info.itemsize = self.itemsize
+        info.readonly = 0
+        info.format = self.format if flags & PyBUF_FORMAT else NULL
+        info.obj = self
+
+    def __dealloc__(array self):
+        if self.callback_free_data != NULL:
+            self.callback_free_data(self.data)
+        elif self.free_data and self.data is not NULL:
+            if self.dtype_is_object:
+                refcount_objects_in_slice(self.data, self._shape, self._strides, self.ndim, inc=False)
+            free(self.data)
+        PyObject_Free(self._shape)
+
+    @property
+    def memview(self):
+        return self.get_memview()
+
+    @cname('get_memview')
+    cdef get_memview(self):
+        flags =  PyBUF_ANY_CONTIGUOUS|PyBUF_FORMAT|PyBUF_WRITABLE
+        return  memoryview(self, flags, self.dtype_is_object)
+
+    def __len__(self):
+        return self._shape[0]
+
+    def __getattr__(self, attr):
+        return getattr(self.memview, attr)
+
+    def __getitem__(self, item):
+        return self.memview[item]
+
+    def __setitem__(self, item, value):
+        self.memview[item] = value
+
+    # Sequence methods
+    try:
+        count = __pyx_collections_abc_Sequence.count
+        index = __pyx_collections_abc_Sequence.index
+    except:
+        pass
+
+@cname("__pyx_array_allocate_buffer")
+cdef int _allocate_buffer(array self) except -1:
+    # use malloc() for backwards compatibility
+    # in case external code wants to change the data pointer
+    cdef Py_ssize_t i
+    cdef PyObject **p
+
+    self.free_data = True
+    self.data = <char *>malloc(self.len)
+    if not self.data:
+        raise MemoryError, "unable to allocate array data."
+
+    if self.dtype_is_object:
+        p = <PyObject **> self.data
+        for i in range(self.len // self.itemsize):
+            p[i] = Py_None
+            Py_INCREF(Py_None)
+    return 0
+
+
+@cname("__pyx_array_new")
+cdef array array_cwrapper(tuple shape, Py_ssize_t itemsize, char *format, char *c_mode, char *buf):
+    cdef array result
+    cdef str mode = "fortran" if c_mode[0] == b'f' else "c"  # this often comes from a constant C string.
+
+    if buf is NULL:
+        result = array.__new__(array, shape, itemsize, format, mode)
+    else:
+        result = array.__new__(array, shape, itemsize, format, mode, allocate_buffer=False)
+        result.data = buf
+
+    return result
+
+
+#
+### Memoryview constants and cython.view.memoryview class
+#
+
+# Disable generic_contiguous, as it makes trouble verifying contiguity:
+#   - 'contiguous' or '::1' means the dimension is contiguous with dtype
+#   - 'indirect_contiguous' means a contiguous list of pointers
+#   - dtype contiguous must be contiguous in the first or last dimension
+#     from the start, or from the dimension following the last indirect dimension
+#
+#   e.g.
+#           int[::indirect_contiguous, ::contiguous, :]
+#
+#   is valid (list of pointers to 2d fortran-contiguous array), but
+#
+#           int[::generic_contiguous, ::contiguous, :]
+#
+#   would mean you'd have assert dimension 0 to be indirect (and pointer contiguous) at runtime.
+#   So it doesn't bring any performance benefit, and it's only confusing.
+
+@cname('__pyx_MemviewEnum')
+cdef class Enum(object):
+    cdef object name
+    def __init__(self, name):
+        self.name = name
+    def __repr__(self):
+        return self.name
+
+cdef generic = Enum("<strided and direct or indirect>")
+cdef strided = Enum("<strided and direct>") # default
+cdef indirect = Enum("<strided and indirect>")
+# Disable generic_contiguous, as it is a troublemaker
+#cdef generic_contiguous = Enum("<contiguous and direct or indirect>")
+cdef contiguous = Enum("<contiguous and direct>")
+cdef indirect_contiguous = Enum("<contiguous and indirect>")
+
+# 'follow' is implied when the first or last axis is ::1
+
+
+# pre-allocate thread locks for reuse
+## note that this could be implemented in a more beautiful way in "normal" Cython,
+## but this code gets merged into the user module and not everything works there.
+cdef int __pyx_memoryview_thread_locks_used = 0
+cdef PyThread_type_lock[{{THREAD_LOCKS_PREALLOCATED}}] __pyx_memoryview_thread_locks = [
+{{for _ in range(THREAD_LOCKS_PREALLOCATED)}}
+    PyThread_allocate_lock(),
+{{endfor}}
+]
+
+
+@cname('__pyx_memoryview')
+cdef class memoryview:
+
+    cdef object obj
+    cdef object _size
+    cdef object _array_interface
+    cdef PyThread_type_lock lock
+    cdef __pyx_atomic_int_type acquisition_count
+    cdef Py_buffer view
+    cdef int flags
+    cdef bint dtype_is_object
+    cdef __Pyx_TypeInfo *typeinfo
+
+    def __cinit__(memoryview self, object obj, int flags, bint dtype_is_object=False):
+        self.obj = obj
+        self.flags = flags
+        if type(self) is memoryview or obj is not None:
+            __Pyx_GetBuffer(obj, &self.view, flags)
+            if <PyObject *> self.view.obj == NULL:
+                (<__pyx_buffer *> &self.view).obj = Py_None
+                Py_INCREF(Py_None)
+
+        if not __PYX_CYTHON_ATOMICS_ENABLED():
+            global __pyx_memoryview_thread_locks_used
+            if __pyx_memoryview_thread_locks_used < {{THREAD_LOCKS_PREALLOCATED}}:
+                self.lock = __pyx_memoryview_thread_locks[__pyx_memoryview_thread_locks_used]
+                __pyx_memoryview_thread_locks_used += 1
+            if self.lock is NULL:
+                self.lock = PyThread_allocate_lock()
+                if self.lock is NULL:
+                    raise MemoryError
+
+        if flags & PyBUF_FORMAT:
+            self.dtype_is_object = (self.view.format[0] == b'O' and self.view.format[1] == b'\0')
+        else:
+            self.dtype_is_object = dtype_is_object
+
+        assert <Py_intptr_t><void*>(&self.acquisition_count) % sizeof(__pyx_atomic_int_type) == 0
+        self.typeinfo = NULL
+
+    def __dealloc__(memoryview self):
+        if self.obj is not None:
+            __Pyx_ReleaseBuffer(&self.view)
+        elif (<__pyx_buffer *> &self.view).obj == Py_None:
+            # Undo the incref in __cinit__() above.
+            (<__pyx_buffer *> &self.view).obj = NULL
+            Py_DECREF(Py_None)
+
+        cdef int i
+        global __pyx_memoryview_thread_locks_used
+        if self.lock != NULL:
+            for i in range(__pyx_memoryview_thread_locks_used):
+                if __pyx_memoryview_thread_locks[i] is self.lock:
+                    __pyx_memoryview_thread_locks_used -= 1
+                    if i != __pyx_memoryview_thread_locks_used:
+                        __pyx_memoryview_thread_locks[i], __pyx_memoryview_thread_locks[__pyx_memoryview_thread_locks_used] = (
+                            __pyx_memoryview_thread_locks[__pyx_memoryview_thread_locks_used], __pyx_memoryview_thread_locks[i])
+                    break
+            else:
+                PyThread_free_lock(self.lock)
+
+    cdef char *get_item_pointer(memoryview self, object index) except NULL:
+        cdef Py_ssize_t dim
+        cdef char *itemp = <char *> self.view.buf
+
+        for dim, idx in enumerate(index):
+            itemp = pybuffer_index(&self.view, itemp, idx, dim)
+
+        return itemp
+
+    #@cname('__pyx_memoryview_getitem')
+    def __getitem__(memoryview self, object index):
+        if index is Ellipsis:
+            return self
+
+        have_slices, indices = _unellipsify(index, self.view.ndim)
+
+        cdef char *itemp
+        if have_slices:
+            return memview_slice(self, indices)
+        else:
+            itemp = self.get_item_pointer(indices)
+            return self.convert_item_to_object(itemp)
+
+    def __setitem__(memoryview self, object index, object value):
+        if self.view.readonly:
+            raise TypeError, "Cannot assign to read-only memoryview"
+
+        have_slices, index = _unellipsify(index, self.view.ndim)
+
+        if have_slices:
+            obj = self.is_slice(value)
+            if obj is not None:
+                self.setitem_slice_assignment(self[index], obj)
+            else:
+                self.setitem_slice_assign_scalar(self[index], value)
+        else:
+            self.setitem_indexed(index, value)
+
+    cdef is_slice(self, obj):
+        if not isinstance(obj, memoryview):
+            try:
+                obj = memoryview(obj, self.flags & ~PyBUF_WRITABLE | PyBUF_ANY_CONTIGUOUS,
+                                 self.dtype_is_object)
+            except TypeError:
+                return None
+
+        return obj
+
+    cdef setitem_slice_assignment(self, dst, src):
+        cdef {{memviewslice_name}} dst_slice
+        cdef {{memviewslice_name}} src_slice
+        cdef {{memviewslice_name}} msrc = get_slice_from_memview(src, &src_slice)[0]
+        cdef {{memviewslice_name}} mdst = get_slice_from_memview(dst, &dst_slice)[0]
+
+        memoryview_copy_contents(msrc, mdst, src.ndim, dst.ndim, self.dtype_is_object)
+
+    cdef setitem_slice_assign_scalar(self, memoryview dst, value):
+        cdef int array[128]
+        cdef void *tmp = NULL
+        cdef void *item
+
+        cdef {{memviewslice_name}} *dst_slice
+        cdef {{memviewslice_name}} tmp_slice
+        dst_slice = get_slice_from_memview(dst, &tmp_slice)
+
+        if <size_t>self.view.itemsize > sizeof(array):
+            tmp = PyMem_Malloc(self.view.itemsize)
+            if tmp == NULL:
+                raise MemoryError
+            item = tmp
+        else:
+            item = <void *> array
+
+        try:
+            if self.dtype_is_object:
+                (<PyObject **> item)[0] = <PyObject *> value
+            else:
+                self.assign_item_from_object(<char *> item, value)
+
+            # It would be easy to support indirect dimensions, but it's easier
+            # to disallow :)
+            if self.view.suboffsets != NULL:
+                assert_direct_dimensions(self.view.suboffsets, self.view.ndim)
+            slice_assign_scalar(dst_slice, dst.view.ndim, self.view.itemsize,
+                                item, self.dtype_is_object)
+        finally:
+            PyMem_Free(tmp)
+
+    cdef setitem_indexed(self, index, value):
+        cdef char *itemp = self.get_item_pointer(index)
+        self.assign_item_from_object(itemp, value)
+
+    cdef convert_item_to_object(self, char *itemp):
+        """Only used if instantiated manually by the user, or if Cython doesn't
+        know how to convert the type"""
+        import struct
+        cdef bytes bytesitem
+        # Do a manual and complete check here instead of this easy hack
+        bytesitem = itemp[:self.view.itemsize]
+        try:
+            result = struct.unpack(self.view.format, bytesitem)
+        except struct.error:
+            raise ValueError, "Unable to convert item to object"
+        else:
+            if len(self.view.format) == 1:
+                return result[0]
+            return result
+
+    cdef assign_item_from_object(self, char *itemp, object value):
+        """Only used if instantiated manually by the user, or if Cython doesn't
+        know how to convert the type"""
+        import struct
+        cdef char c
+        cdef bytes bytesvalue
+        cdef Py_ssize_t i
+
+        if isinstance(value, tuple):
+            bytesvalue = struct.pack(self.view.format, *value)
+        else:
+            bytesvalue = struct.pack(self.view.format, value)
+
+        for i, c in enumerate(bytesvalue):
+            itemp[i] = c
+
+    @cname('getbuffer')
+    def __getbuffer__(self, Py_buffer *info, int flags):
+        if flags & PyBUF_WRITABLE and self.view.readonly:
+            raise ValueError, "Cannot create writable memory view from read-only memoryview"
+
+        if flags & PyBUF_ND:
+            info.shape = self.view.shape
+        else:
+            info.shape = NULL
+
+        if flags & PyBUF_STRIDES:
+            info.strides = self.view.strides
+        else:
+            info.strides = NULL
+
+        if flags & PyBUF_INDIRECT:
+            info.suboffsets = self.view.suboffsets
+        else:
+            info.suboffsets = NULL
+
+        if flags & PyBUF_FORMAT:
+            info.format = self.view.format
+        else:
+            info.format = NULL
+
+        info.buf = self.view.buf
+        info.ndim = self.view.ndim
+        info.itemsize = self.view.itemsize
+        info.len = self.view.len
+        info.readonly = self.view.readonly
+        info.obj = self
+
+    # Some properties that have the same semantics as in NumPy
+    @property
+    def T(self):
+        cdef _memoryviewslice result = memoryview_copy(self)
+        transpose_memslice(&result.from_slice)
+        return result
+
+    @property
+    def base(self):
+        return self._get_base()
+
+    cdef _get_base(self):
+        return self.obj
+
+    @property
+    def shape(self):
+        return tuple([length for length in self.view.shape[:self.view.ndim]])
+
+    @property
+    def strides(self):
+        if self.view.strides == NULL:
+            # Note: we always ask for strides, so if this is not set it's a bug
+            raise ValueError, "Buffer view does not expose strides"
+
+        return tuple([stride for stride in self.view.strides[:self.view.ndim]])
+
+    @property
+    def suboffsets(self):
+        if self.view.suboffsets == NULL:
+            return (-1,) * self.view.ndim
+
+        return tuple([suboffset for suboffset in self.view.suboffsets[:self.view.ndim]])
+
+    @property
+    def ndim(self):
+        return self.view.ndim
+
+    @property
+    def itemsize(self):
+        return self.view.itemsize
+
+    @property
+    def nbytes(self):
+        return self.size * self.view.itemsize
+
+    @property
+    def size(self):
+        if self._size is None:
+            result = 1
+
+            for length in self.view.shape[:self.view.ndim]:
+                result *= length
+
+            self._size = result
+
+        return self._size
+
+    def __len__(self):
+        if self.view.ndim >= 1:
+            return self.view.shape[0]
+
+        return 0
+
+    def __repr__(self):
+        return "<MemoryView of %r at 0x%x>" % (self.base.__class__.__name__,
+                                               id(self))
+
+    def __str__(self):
+        return "<MemoryView of %r object>" % (self.base.__class__.__name__,)
+
+    # Support the same attributes as memoryview slices
+    def is_c_contig(self):
+        cdef {{memviewslice_name}} *mslice
+        cdef {{memviewslice_name}} tmp
+        mslice = get_slice_from_memview(self, &tmp)
+        return slice_is_contig(mslice[0], 'C', self.view.ndim)
+
+    def is_f_contig(self):
+        cdef {{memviewslice_name}} *mslice
+        cdef {{memviewslice_name}} tmp
+        mslice = get_slice_from_memview(self, &tmp)
+        return slice_is_contig(mslice[0], 'F', self.view.ndim)
+
+    def copy(self):
+        cdef {{memviewslice_name}} mslice
+        cdef int flags = self.flags & ~PyBUF_F_CONTIGUOUS
+
+        slice_copy(self, &mslice)
+        mslice = slice_copy_contig(&mslice, "c", self.view.ndim,
+                                   self.view.itemsize,
+                                   flags|PyBUF_C_CONTIGUOUS,
+                                   self.dtype_is_object)
+
+        return memoryview_copy_from_slice(self, &mslice)
+
+    def copy_fortran(self):
+        cdef {{memviewslice_name}} src, dst
+        cdef int flags = self.flags & ~PyBUF_C_CONTIGUOUS
+
+        slice_copy(self, &src)
+        dst = slice_copy_contig(&src, "fortran", self.view.ndim,
+                                self.view.itemsize,
+                                flags|PyBUF_F_CONTIGUOUS,
+                                self.dtype_is_object)
+
+        return memoryview_copy_from_slice(self, &dst)
+
+
+@cname('__pyx_memoryview_new')
+cdef memoryview_cwrapper(object o, int flags, bint dtype_is_object, __Pyx_TypeInfo *typeinfo):
+    cdef memoryview result = memoryview(o, flags, dtype_is_object)
+    result.typeinfo = typeinfo
+    return result
+
+@cname('__pyx_memoryview_check')
+cdef inline bint memoryview_check(object o) noexcept:
+    return isinstance(o, memoryview)
+
+cdef tuple _unellipsify(object index, int ndim):
+    """
+    Replace all ellipses with full slices and fill incomplete indices with
+    full slices.
+    """
+    cdef Py_ssize_t idx
+    tup = <tuple>index if isinstance(index, tuple) else (index,)
+
+    result = [slice(None)] * ndim
+    have_slices = False
+    seen_ellipsis = False
+    idx = 0
+    for item in tup:
+        if item is Ellipsis:
+            if not seen_ellipsis:
+                idx += ndim - len(tup)
+                seen_ellipsis = True
+            have_slices = True
+        else:
+            if isinstance(item, slice):
+                have_slices = True
+            elif not PyIndex_Check(item):
+                raise TypeError, f"Cannot index with type '{type(item)}'"
+            result[idx] = item
+        idx += 1
+
+    nslices = ndim - idx
+    return have_slices or nslices, tuple(result)
+
+cdef int assert_direct_dimensions(Py_ssize_t *suboffsets, int ndim) except -1:
+    for suboffset in suboffsets[:ndim]:
+        if suboffset >= 0:
+            raise ValueError, "Indirect dimensions not supported"
+    return 0  # return type just used as an error flag
+
+#
+### Slicing a memoryview
+#
+
+@cname('__pyx_memview_slice')
+cdef memoryview memview_slice(memoryview memview, object indices):
+    cdef int new_ndim = 0, suboffset_dim = -1, dim
+    cdef bint negative_step
+    cdef {{memviewslice_name}} src, dst
+    cdef {{memviewslice_name}} *p_src
+
+    # dst is copied by value in memoryview_fromslice -- initialize it
+    # src is never copied
+    memset(&dst, 0, sizeof(dst))
+
+    cdef _memoryviewslice memviewsliceobj
+
+    assert memview.view.ndim > 0
+
+    if isinstance(memview, _memoryviewslice):
+        memviewsliceobj = memview
+        p_src = &memviewsliceobj.from_slice
+    else:
+        slice_copy(memview, &src)
+        p_src = &src
+
+    # Note: don't use variable src at this point
+    # SubNote: we should be able to declare variables in blocks...
+
+    # memoryview_fromslice() will inc our dst slice
+    dst.memview = p_src.memview
+    dst.data = p_src.data
+
+    # Put everything in temps to avoid this bloody warning:
+    # "Argument evaluation order in C function call is undefined and
+    #  may not be as expected"
+    cdef {{memviewslice_name}} *p_dst = &dst
+    cdef int *p_suboffset_dim = &suboffset_dim
+    cdef Py_ssize_t start, stop, step, cindex
+    cdef bint have_start, have_stop, have_step
+
+    for dim, index in enumerate(indices):
+        if PyIndex_Check(index):
+            cindex = index
+            slice_memviewslice(
+                p_dst, p_src.shape[dim], p_src.strides[dim], p_src.suboffsets[dim],
+                dim, new_ndim, p_suboffset_dim,
+                cindex, 0, 0, # start, stop, step
+                0, 0, 0, # have_{start,stop,step}
+                False)
+        elif index is None:
+            p_dst.shape[new_ndim] = 1
+            p_dst.strides[new_ndim] = 0
+            p_dst.suboffsets[new_ndim] = -1
+            new_ndim += 1
+        else:
+            start = index.start or 0
+            stop = index.stop or 0
+            step = index.step or 0
+
+            have_start = index.start is not None
+            have_stop = index.stop is not None
+            have_step = index.step is not None
+
+            slice_memviewslice(
+                p_dst, p_src.shape[dim], p_src.strides[dim], p_src.suboffsets[dim],
+                dim, new_ndim, p_suboffset_dim,
+                start, stop, step,
+                have_start, have_stop, have_step,
+                True)
+            new_ndim += 1
+
+    if isinstance(memview, _memoryviewslice):
+        return memoryview_fromslice(dst, new_ndim,
+                                    memviewsliceobj.to_object_func,
+                                    memviewsliceobj.to_dtype_func,
+                                    memview.dtype_is_object)
+    else:
+        return memoryview_fromslice(dst, new_ndim, NULL, NULL,
+                                    memview.dtype_is_object)
+
+
+#
+### Slicing in a single dimension of a memoryviewslice
+#
+
+@cname('__pyx_memoryview_slice_memviewslice')
+cdef int slice_memviewslice(
+        {{memviewslice_name}} *dst,
+        Py_ssize_t shape, Py_ssize_t stride, Py_ssize_t suboffset,
+        int dim, int new_ndim, int *suboffset_dim,
+        Py_ssize_t start, Py_ssize_t stop, Py_ssize_t step,
+        int have_start, int have_stop, int have_step,
+        bint is_slice) except -1 nogil:
+    """
+    Create a new slice dst given slice src.
+
+    dim             - the current src dimension (indexing will make dimensions
+                                                 disappear)
+    new_dim         - the new dst dimension
+    suboffset_dim   - pointer to a single int initialized to -1 to keep track of
+                      where slicing offsets should be added
+    """
+
+    cdef Py_ssize_t new_shape
+    cdef bint negative_step
+
+    if not is_slice:
+        # index is a normal integer-like index
+        if start < 0:
+            start += shape
+        if not 0 <= start < shape:
+            _err_dim(PyExc_IndexError, "Index out of bounds (axis %d)", dim)
+    else:
+        # index is a slice
+        if have_step:
+            negative_step = step < 0
+            if step == 0:
+                _err_dim(PyExc_ValueError, "Step may not be zero (axis %d)", dim)
+        else:
+            negative_step = False
+            step = 1
+
+        # check our bounds and set defaults
+        if have_start:
+            if start < 0:
+                start += shape
+                if start < 0:
+                    start = 0
+            elif start >= shape:
+                if negative_step:
+                    start = shape - 1
+                else:
+                    start = shape
+        else:
+            if negative_step:
+                start = shape - 1
+            else:
+                start = 0
+
+        if have_stop:
+            if stop < 0:
+                stop += shape
+                if stop < 0:
+                    stop = 0
+            elif stop > shape:
+                stop = shape
+        else:
+            if negative_step:
+                stop = -1
+            else:
+                stop = shape
+
+        # len = ceil( (stop - start) / step )
+        with cython.cdivision(True):
+            new_shape = (stop - start) // step
+
+            if (stop - start) - step * new_shape:
+                new_shape += 1
+
+        if new_shape < 0:
+            new_shape = 0
+
+        # shape/strides/suboffsets
+        dst.strides[new_ndim] = stride * step
+        dst.shape[new_ndim] = new_shape
+        dst.suboffsets[new_ndim] = suboffset
+
+    # Add the slicing or indexing offsets to the right suboffset or base data *
+    if suboffset_dim[0] < 0:
+        dst.data += start * stride
+    else:
+        dst.suboffsets[suboffset_dim[0]] += start * stride
+
+    if suboffset >= 0:
+        if not is_slice:
+            if new_ndim == 0:
+                dst.data = (<char **> dst.data)[0] + suboffset
+            else:
+                _err_dim(PyExc_IndexError, "All dimensions preceding dimension %d "
+                                     "must be indexed and not sliced", dim)
+        else:
+            suboffset_dim[0] = new_ndim
+
+    return 0
+
+#
+### Index a memoryview
+#
+@cname('__pyx_pybuffer_index')
+cdef char *pybuffer_index(Py_buffer *view, char *bufp, Py_ssize_t index,
+                          Py_ssize_t dim) except NULL:
+    cdef Py_ssize_t shape, stride, suboffset = -1
+    cdef Py_ssize_t itemsize = view.itemsize
+    cdef char *resultp
+
+    if view.ndim == 0:
+        shape = view.len // itemsize
+        stride = itemsize
+    else:
+        shape = view.shape[dim]
+        stride = view.strides[dim]
+        if view.suboffsets != NULL:
+            suboffset = view.suboffsets[dim]
+
+    if index < 0:
+        index += view.shape[dim]
+        if index < 0:
+            raise IndexError, f"Out of bounds on buffer access (axis {dim})"
+
+    if index >= shape:
+        raise IndexError, f"Out of bounds on buffer access (axis {dim})"
+
+    resultp = bufp + index * stride
+    if suboffset >= 0:
+        resultp = (<char **> resultp)[0] + suboffset
+
+    return resultp
+
+#
+### Transposing a memoryviewslice
+#
+@cname('__pyx_memslice_transpose')
+cdef int transpose_memslice({{memviewslice_name}} *memslice) except -1 nogil:
+    cdef int ndim = memslice.memview.view.ndim
+
+    cdef Py_ssize_t *shape = memslice.shape
+    cdef Py_ssize_t *strides = memslice.strides
+
+    # reverse strides and shape
+    cdef int i, j
+    for i in range(ndim // 2):
+        j = ndim - 1 - i
+        strides[i], strides[j] = strides[j], strides[i]
+        shape[i], shape[j] = shape[j], shape[i]
+
+        if memslice.suboffsets[i] >= 0 or memslice.suboffsets[j] >= 0:
+            _err(PyExc_ValueError, "Cannot transpose memoryview with indirect dimensions")
+
+    return 0
+
+#
+### Creating new memoryview objects from slices and memoryviews
+#
+[email protected]_type("sequence")
+@cname('__pyx_memoryviewslice')
+cdef class _memoryviewslice(memoryview):
+    "Internal class for passing memoryview slices to Python"
+
+    # We need this to keep our shape/strides/suboffset pointers valid
+    cdef {{memviewslice_name}} from_slice
+    # We need this only to print it's class' name
+    cdef object from_object
+
+    cdef object (*to_object_func)(char *)
+    cdef int (*to_dtype_func)(char *, object) except 0
+
+    def __dealloc__(self):
+        __PYX_XCLEAR_MEMVIEW(&self.from_slice, 1)
+
+    cdef convert_item_to_object(self, char *itemp):
+        if self.to_object_func != NULL:
+            return self.to_object_func(itemp)
+        else:
+            return memoryview.convert_item_to_object(self, itemp)
+
+    cdef assign_item_from_object(self, char *itemp, object value):
+        if self.to_dtype_func != NULL:
+            self.to_dtype_func(itemp, value)
+        else:
+            memoryview.assign_item_from_object(self, itemp, value)
+
+    cdef _get_base(self):
+        return self.from_object
+
+    # Sequence methods
+    try:
+        count = __pyx_collections_abc_Sequence.count
+        index = __pyx_collections_abc_Sequence.index
+    except:
+        pass
+
+try:
+    if __pyx_collections_abc_Sequence:
+        # The main value of registering _memoryviewslice as a
+        # Sequence is that it can be used in structural pattern
+        # matching in Python 3.10+
+        __pyx_collections_abc_Sequence.register(_memoryviewslice)
+        __pyx_collections_abc_Sequence.register(array)
+except:
+    pass  # ignore failure, it's a minor issue
+
+@cname('__pyx_memoryview_fromslice')
+cdef memoryview_fromslice({{memviewslice_name}} memviewslice,
+                          int ndim,
+                          object (*to_object_func)(char *),
+                          int (*to_dtype_func)(char *, object) except 0,
+                          bint dtype_is_object):
+
+    cdef _memoryviewslice result
+
+    if <PyObject *> memviewslice.memview == Py_None:
+        return None
+
+    # assert 0 < ndim <= memviewslice.memview.view.ndim, (
+    #                 ndim, memviewslice.memview.view.ndim)
+
+    result = _memoryviewslice.__new__(_memoryviewslice, None, 0, dtype_is_object)
+
+    result.from_slice = memviewslice
+    __PYX_INC_MEMVIEW(&memviewslice, 1)
+
+    result.from_object = (<memoryview> memviewslice.memview)._get_base()
+    result.typeinfo = memviewslice.memview.typeinfo
+
+    result.view = memviewslice.memview.view
+    result.view.buf = <void *> memviewslice.data
+    result.view.ndim = ndim
+    (<__pyx_buffer *> &result.view).obj = Py_None
+    Py_INCREF(Py_None)
+
+    if (<memoryview>memviewslice.memview).flags & PyBUF_WRITABLE:
+        result.flags = PyBUF_RECORDS
+    else:
+        result.flags = PyBUF_RECORDS_RO
+
+    result.view.shape = <Py_ssize_t *> result.from_slice.shape
+    result.view.strides = <Py_ssize_t *> result.from_slice.strides
+
+    # only set suboffsets if actually used, otherwise set to NULL to improve compatibility
+    result.view.suboffsets = NULL
+    for suboffset in result.from_slice.suboffsets[:ndim]:
+        if suboffset >= 0:
+            result.view.suboffsets = <Py_ssize_t *> result.from_slice.suboffsets
+            break
+
+    result.view.len = result.view.itemsize
+    for length in result.view.shape[:ndim]:
+        result.view.len *= length
+
+    result.to_object_func = to_object_func
+    result.to_dtype_func = to_dtype_func
+
+    return result
+
+@cname('__pyx_memoryview_get_slice_from_memoryview')
+cdef {{memviewslice_name}} *get_slice_from_memview(memoryview memview,
+                                                   {{memviewslice_name}} *mslice) except NULL:
+    cdef _memoryviewslice obj
+    if isinstance(memview, _memoryviewslice):
+        obj = memview
+        return &obj.from_slice
+    else:
+        slice_copy(memview, mslice)
+        return mslice
+
+@cname('__pyx_memoryview_slice_copy')
+cdef void slice_copy(memoryview memview, {{memviewslice_name}} *dst) noexcept:
+    cdef int dim
+    cdef (Py_ssize_t*) shape, strides, suboffsets
+
+    shape = memview.view.shape
+    strides = memview.view.strides
+    suboffsets = memview.view.suboffsets
+
+    dst.memview = <__pyx_memoryview *> memview
+    dst.data = <char *> memview.view.buf
+
+    for dim in range(memview.view.ndim):
+        dst.shape[dim] = shape[dim]
+        dst.strides[dim] = strides[dim]
+        dst.suboffsets[dim] = suboffsets[dim] if suboffsets else -1
+
+@cname('__pyx_memoryview_copy_object')
+cdef memoryview_copy(memoryview memview):
+    "Create a new memoryview object"
+    cdef {{memviewslice_name}} memviewslice
+    slice_copy(memview, &memviewslice)
+    return memoryview_copy_from_slice(memview, &memviewslice)
+
+@cname('__pyx_memoryview_copy_object_from_slice')
+cdef memoryview_copy_from_slice(memoryview memview, {{memviewslice_name}} *memviewslice):
+    """
+    Create a new memoryview object from a given memoryview object and slice.
+    """
+    cdef object (*to_object_func)(char *)
+    cdef int (*to_dtype_func)(char *, object) except 0
+
+    if isinstance(memview, _memoryviewslice):
+        to_object_func = (<_memoryviewslice> memview).to_object_func
+        to_dtype_func = (<_memoryviewslice> memview).to_dtype_func
+    else:
+        to_object_func = NULL
+        to_dtype_func = NULL
+
+    return memoryview_fromslice(memviewslice[0], memview.view.ndim,
+                                to_object_func, to_dtype_func,
+                                memview.dtype_is_object)
+
+
+#
+### Copy the contents of a memoryview slices
+#
+cdef Py_ssize_t abs_py_ssize_t(Py_ssize_t arg) noexcept nogil:
+    return -arg if arg < 0 else arg
+
+@cname('__pyx_get_best_slice_order')
+cdef char get_best_order({{memviewslice_name}} *mslice, int ndim) noexcept nogil:
+    """
+    Figure out the best memory access order for a given slice.
+    """
+    cdef int i
+    cdef Py_ssize_t c_stride = 0
+    cdef Py_ssize_t f_stride = 0
+
+    for i in range(ndim - 1, -1, -1):
+        if mslice.shape[i] > 1:
+            c_stride = mslice.strides[i]
+            break
+
+    for i in range(ndim):
+        if mslice.shape[i] > 1:
+            f_stride = mslice.strides[i]
+            break
+
+    if abs_py_ssize_t(c_stride) <= abs_py_ssize_t(f_stride):
+        return 'C'
+    else:
+        return 'F'
+
+[email protected](True)
+cdef void _copy_strided_to_strided(char *src_data, Py_ssize_t *src_strides,
+                                   char *dst_data, Py_ssize_t *dst_strides,
+                                   Py_ssize_t *src_shape, Py_ssize_t *dst_shape,
+                                   int ndim, size_t itemsize) noexcept nogil:
+    # Note: src_extent is 1 if we're broadcasting
+    # dst_extent always >= src_extent as we don't do reductions
+    cdef Py_ssize_t i
+    cdef Py_ssize_t src_extent = src_shape[0]
+    cdef Py_ssize_t dst_extent = dst_shape[0]
+    cdef Py_ssize_t src_stride = src_strides[0]
+    cdef Py_ssize_t dst_stride = dst_strides[0]
+
+    if ndim == 1:
+        if (src_stride > 0 and dst_stride > 0 and
+            <size_t> src_stride == itemsize == <size_t> dst_stride):
+            memcpy(dst_data, src_data, itemsize * dst_extent)
+        else:
+            for i in range(dst_extent):
+                memcpy(dst_data, src_data, itemsize)
+                src_data += src_stride
+                dst_data += dst_stride
+    else:
+        for i in range(dst_extent):
+            _copy_strided_to_strided(src_data, src_strides + 1,
+                                     dst_data, dst_strides + 1,
+                                     src_shape + 1, dst_shape + 1,
+                                     ndim - 1, itemsize)
+            src_data += src_stride
+            dst_data += dst_stride
+
+cdef void copy_strided_to_strided({{memviewslice_name}} *src,
+                                  {{memviewslice_name}} *dst,
+                                  int ndim, size_t itemsize) noexcept nogil:
+    _copy_strided_to_strided(src.data, src.strides, dst.data, dst.strides,
+                             src.shape, dst.shape, ndim, itemsize)
+
+@cname('__pyx_memoryview_slice_get_size')
+cdef Py_ssize_t slice_get_size({{memviewslice_name}} *src, int ndim) noexcept nogil:
+    "Return the size of the memory occupied by the slice in number of bytes"
+    cdef Py_ssize_t shape, size = src.memview.view.itemsize
+
+    for shape in src.shape[:ndim]:
+        size *= shape
+
+    return size
+
+@cname('__pyx_fill_contig_strides_array')
+cdef Py_ssize_t fill_contig_strides_array(
+                Py_ssize_t *shape, Py_ssize_t *strides, Py_ssize_t stride,
+                int ndim, char order) noexcept nogil:
+    """
+    Fill the strides array for a slice with C or F contiguous strides.
+    This is like PyBuffer_FillContiguousStrides, but compatible with py < 2.6
+    """
+    cdef int idx
+
+    if order == 'F':
+        for idx in range(ndim):
+            strides[idx] = stride
+            stride *= shape[idx]
+    else:
+        for idx in range(ndim - 1, -1, -1):
+            strides[idx] = stride
+            stride *= shape[idx]
+
+    return stride
+
+@cname('__pyx_memoryview_copy_data_to_temp')
+cdef void *copy_data_to_temp({{memviewslice_name}} *src,
+                             {{memviewslice_name}} *tmpslice,
+                             char order,
+                             int ndim) except NULL nogil:
+    """
+    Copy a direct slice to temporary contiguous memory. The caller should free
+    the result when done.
+    """
+    cdef int i
+    cdef void *result
+
+    cdef size_t itemsize = src.memview.view.itemsize
+    cdef size_t size = slice_get_size(src, ndim)
+
+    result = malloc(size)
+    if not result:
+        _err_no_memory()
+
+    # tmpslice[0] = src
+    tmpslice.data = <char *> result
+    tmpslice.memview = src.memview
+    for i in range(ndim):
+        tmpslice.shape[i] = src.shape[i]
+        tmpslice.suboffsets[i] = -1
+
+    fill_contig_strides_array(&tmpslice.shape[0], &tmpslice.strides[0], itemsize, ndim, order)
+
+    # We need to broadcast strides again
+    for i in range(ndim):
+        if tmpslice.shape[i] == 1:
+            tmpslice.strides[i] = 0
+
+    if slice_is_contig(src[0], order, ndim):
+        memcpy(result, src.data, size)
+    else:
+        copy_strided_to_strided(src, tmpslice, ndim, itemsize)
+
+    return result
+
+# Use 'with gil' functions and avoid 'with gil' blocks, as the code within the blocks
+# has temporaries that need the GIL to clean up
+@cname('__pyx_memoryview_err_extents')
+cdef int _err_extents(int i, Py_ssize_t extent1,
+                             Py_ssize_t extent2) except -1 with gil:
+    raise ValueError, f"got differing extents in dimension {i} (got {extent1} and {extent2})"
+
+@cname('__pyx_memoryview_err_dim')
+cdef int _err_dim(PyObject *error, str msg, int dim) except -1 with gil:
+    raise <object>error, msg % dim
+
+@cname('__pyx_memoryview_err')
+cdef int _err(PyObject *error, str msg) except -1 with gil:
+    raise <object>error, msg
+
+@cname('__pyx_memoryview_err_no_memory')
+cdef int _err_no_memory() except -1 with gil:
+    raise MemoryError
+
+
+@cname('__pyx_memoryview_copy_contents')
+cdef int memoryview_copy_contents({{memviewslice_name}} src,
+                                  {{memviewslice_name}} dst,
+                                  int src_ndim, int dst_ndim,
+                                  bint dtype_is_object) except -1 nogil:
+    """
+    Copy memory from slice src to slice dst.
+    Check for overlapping memory and verify the shapes.
+    """
+    cdef void *tmpdata = NULL
+    cdef size_t itemsize = src.memview.view.itemsize
+    cdef int i
+    cdef char order = get_best_order(&src, src_ndim)
+    cdef bint broadcasting = False
+    cdef bint direct_copy = False
+    cdef {{memviewslice_name}} tmp
+
+    if src_ndim < dst_ndim:
+        broadcast_leading(&src, src_ndim, dst_ndim)
+    elif dst_ndim < src_ndim:
+        broadcast_leading(&dst, dst_ndim, src_ndim)
+
+    cdef int ndim = max(src_ndim, dst_ndim)
+
+    for i in range(ndim):
+        if src.shape[i] != dst.shape[i]:
+            if src.shape[i] == 1:
+                broadcasting = True
+                src.strides[i] = 0
+            else:
+                _err_extents(i, dst.shape[i], src.shape[i])
+
+        if src.suboffsets[i] >= 0:
+            _err_dim(PyExc_ValueError, "Dimension %d is not direct", i)
+
+    if slices_overlap(&src, &dst, ndim, itemsize):
+        # slices overlap, copy to temp, copy temp to dst
+        if not slice_is_contig(src, order, ndim):
+            order = get_best_order(&dst, ndim)
+
+        tmpdata = copy_data_to_temp(&src, &tmp, order, ndim)
+        src = tmp
+
+    if not broadcasting:
+        # See if both slices have equal contiguity, in that case perform a
+        # direct copy. This only works when we are not broadcasting.
+        if slice_is_contig(src, 'C', ndim):
+            direct_copy = slice_is_contig(dst, 'C', ndim)
+        elif slice_is_contig(src, 'F', ndim):
+            direct_copy = slice_is_contig(dst, 'F', ndim)
+
+        if direct_copy:
+            # Contiguous slices with same order
+            refcount_copying(&dst, dtype_is_object, ndim, inc=False)
+            memcpy(dst.data, src.data, slice_get_size(&src, ndim))
+            refcount_copying(&dst, dtype_is_object, ndim, inc=True)
+            free(tmpdata)
+            return 0
+
+    if order == 'F' == get_best_order(&dst, ndim):
+        # see if both slices have Fortran order, transpose them to match our
+        # C-style indexing order
+        transpose_memslice(&src)
+        transpose_memslice(&dst)
+
+    refcount_copying(&dst, dtype_is_object, ndim, inc=False)
+    copy_strided_to_strided(&src, &dst, ndim, itemsize)
+    refcount_copying(&dst, dtype_is_object, ndim, inc=True)
+
+    free(tmpdata)
+    return 0
+
+@cname('__pyx_memoryview_broadcast_leading')
+cdef void broadcast_leading({{memviewslice_name}} *mslice,
+                            int ndim,
+                            int ndim_other) noexcept nogil:
+    cdef int i
+    cdef int offset = ndim_other - ndim
+
+    for i in range(ndim - 1, -1, -1):
+        mslice.shape[i + offset] = mslice.shape[i]
+        mslice.strides[i + offset] = mslice.strides[i]
+        mslice.suboffsets[i + offset] = mslice.suboffsets[i]
+
+    for i in range(offset):
+        mslice.shape[i] = 1
+        mslice.strides[i] = mslice.strides[0]
+        mslice.suboffsets[i] = -1
+
+#
+### Take care of refcounting the objects in slices. Do this separately from any copying,
+### to minimize acquiring the GIL
+#
+
+@cname('__pyx_memoryview_refcount_copying')
+cdef void refcount_copying({{memviewslice_name}} *dst, bint dtype_is_object, int ndim, bint inc) noexcept nogil:
+    # incref or decref the objects in the destination slice if the dtype is object
+    if dtype_is_object:
+        refcount_objects_in_slice_with_gil(dst.data, dst.shape, dst.strides, ndim, inc)
+
+@cname('__pyx_memoryview_refcount_objects_in_slice_with_gil')
+cdef void refcount_objects_in_slice_with_gil(char *data, Py_ssize_t *shape,
+                                             Py_ssize_t *strides, int ndim,
+                                             bint inc) noexcept with gil:
+    refcount_objects_in_slice(data, shape, strides, ndim, inc)
+
+@cname('__pyx_memoryview_refcount_objects_in_slice')
+cdef void refcount_objects_in_slice(char *data, Py_ssize_t *shape,
+                                    Py_ssize_t *strides, int ndim, bint inc) noexcept:
+    cdef Py_ssize_t i
+    cdef Py_ssize_t stride = strides[0]
+
+    for i in range(shape[0]):
+        if ndim == 1:
+            if inc:
+                Py_INCREF((<PyObject **> data)[0])
+            else:
+                Py_DECREF((<PyObject **> data)[0])
+        else:
+            refcount_objects_in_slice(data, shape + 1, strides + 1, ndim - 1, inc)
+
+        data += stride
+
+#
+### Scalar to slice assignment
+#
+@cname('__pyx_memoryview_slice_assign_scalar')
+cdef void slice_assign_scalar({{memviewslice_name}} *dst, int ndim,
+                              size_t itemsize, void *item,
+                              bint dtype_is_object) noexcept nogil:
+    refcount_copying(dst, dtype_is_object, ndim, inc=False)
+    _slice_assign_scalar(dst.data, dst.shape, dst.strides, ndim, itemsize, item)
+    refcount_copying(dst, dtype_is_object, ndim, inc=True)
+
+
+@cname('__pyx_memoryview__slice_assign_scalar')
+cdef void _slice_assign_scalar(char *data, Py_ssize_t *shape,
+                              Py_ssize_t *strides, int ndim,
+                              size_t itemsize, void *item) noexcept nogil:
+    cdef Py_ssize_t i
+    cdef Py_ssize_t stride = strides[0]
+    cdef Py_ssize_t extent = shape[0]
+
+    if ndim == 1:
+        for i in range(extent):
+            memcpy(data, item, itemsize)
+            data += stride
+    else:
+        for i in range(extent):
+            _slice_assign_scalar(data, shape + 1, strides + 1, ndim - 1, itemsize, item)
+            data += stride
+
+
+############### BufferFormatFromTypeInfo ###############
+cdef extern from *:
+    ctypedef struct __Pyx_StructField
+
+    cdef enum:
+        __PYX_BUF_FLAGS_PACKED_STRUCT
+        __PYX_BUF_FLAGS_INTEGER_COMPLEX
+
+    ctypedef struct __Pyx_TypeInfo:
+        char* name
+        __Pyx_StructField* fields
+        size_t size
+        size_t arraysize[8]
+        int ndim
+        char typegroup
+        char is_unsigned
+        int flags
+
+    ctypedef struct __Pyx_StructField:
+        __Pyx_TypeInfo* type
+        char* name
+        size_t offset
+
+    ctypedef struct __Pyx_BufFmt_StackElem:
+        __Pyx_StructField* field
+        size_t parent_offset
+
+    #ctypedef struct __Pyx_BufFmt_Context:
+    #  __Pyx_StructField root
+        __Pyx_BufFmt_StackElem* head
+
+    struct __pyx_typeinfo_string:
+        char string[3]
+
+    __pyx_typeinfo_string __Pyx_TypeInfoToFormat(__Pyx_TypeInfo *)
+
+
+@cname('__pyx_format_from_typeinfo')
+cdef bytes format_from_typeinfo(__Pyx_TypeInfo *type):
+    cdef __Pyx_StructField *field
+    cdef __pyx_typeinfo_string fmt
+    cdef bytes part, result
+    cdef Py_ssize_t i
+
+    if type.typegroup == 'S':
+        assert type.fields != NULL
+        assert type.fields.type != NULL
+
+        if type.flags & __PYX_BUF_FLAGS_PACKED_STRUCT:
+            alignment = b'^'
+        else:
+            alignment = b''
+
+        parts = [b"T{"]
+        field = type.fields
+
+        while field.type:
+            part = format_from_typeinfo(field.type)
+            parts.append(part + b':' + field.name + b':')
+            field += 1
+
+        result = alignment.join(parts) + b'}'
+    else:
+        fmt = __Pyx_TypeInfoToFormat(type)
+        result = fmt.string
+        if type.arraysize[0]:
+            extents = [f"{type.arraysize[i]}" for i in range(type.ndim)]
+            result = f"({u','.join(extents)})".encode('ascii') + result
+
+    return result
diff --git a/contrib/tools/cython_py2/Cython/Utility/MemoryView_C.c b/contrib/tools/cython_py2/Cython/Utility/MemoryView_C.c
new file mode 100644
index 00000000000..7b0d8ff5d3f
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/MemoryView_C.c
@@ -0,0 +1,987 @@
+////////// MemviewSliceStruct.proto //////////
+//@proto_block: utility_code_proto_before_types
+
+/* memoryview slice struct */
+struct {{memview_struct_name}};
+
+typedef struct {
+  struct {{memview_struct_name}} *memview;
+  char *data;
+  Py_ssize_t shape[{{max_dims}}];
+  Py_ssize_t strides[{{max_dims}}];
+  Py_ssize_t suboffsets[{{max_dims}}];
+} {{memviewslice_name}};
+
+// used for "len(memviewslice)"
+#define __Pyx_MemoryView_Len(m)  (m.shape[0])
+
+
+/////////// Atomics.proto /////////////
+//@proto_block: utility_code_proto_before_types
+
+#include <pythread.h>
+
+#ifndef CYTHON_ATOMICS
+    #define CYTHON_ATOMICS 1
+#endif
+// using CYTHON_ATOMICS as a cdef extern bint in the Cython memoryview code
+// interacts badly with "import *". Therefore, define a helper function-like macro
+#define __PYX_CYTHON_ATOMICS_ENABLED() CYTHON_ATOMICS
+
+#define __pyx_atomic_int_type int
+#define __pyx_nonatomic_int_type int
+
+// For standard C/C++ atomics, get the headers first so we have ATOMIC_INT_LOCK_FREE
+// defined when we decide to use them.
+#if CYTHON_ATOMICS && (defined(__STDC_VERSION__) && \
+                        (__STDC_VERSION__ >= 201112L) && \
+                        !defined(__STDC_NO_ATOMICS__))
+    #include <stdatomic.h>
+#elif CYTHON_ATOMICS && (defined(__cplusplus) && ( \
+                    (__cplusplus >= 201103L) || \
+                    (defined(_MSC_VER) && _MSC_VER >= 1700)))
+    #include <atomic>
+#endif
+
+#if CYTHON_ATOMICS && (defined(__STDC_VERSION__) && \
+                        (__STDC_VERSION__ >= 201112L) && \
+                        !defined(__STDC_NO_ATOMICS__) && \
+                       ATOMIC_INT_LOCK_FREE == 2)
+    // C11 atomics are available and  ATOMIC_INT_LOCK_FREE is definitely on
+    #undef __pyx_atomic_int_type
+    #define __pyx_atomic_int_type atomic_int
+    #define __pyx_atomic_incr_aligned(value) atomic_fetch_add_explicit(value, 1, memory_order_relaxed)
+    #define __pyx_atomic_decr_aligned(value) atomic_fetch_sub_explicit(value, 1, memory_order_acq_rel)
+    #if defined(__PYX_DEBUG_ATOMICS) && defined(_MSC_VER)
+        #pragma message ("Using standard C atomics")
+    #elif defined(__PYX_DEBUG_ATOMICS)
+        #warning "Using standard C atomics"
+    #endif
+#elif CYTHON_ATOMICS && (defined(__cplusplus) && ( \
+                    (__cplusplus >= 201103L) || \
+                    /*_MSC_VER 1700 is Visual Studio 2012 */ \
+                    (defined(_MSC_VER) && _MSC_VER >= 1700)) && \
+                    ATOMIC_INT_LOCK_FREE == 2)
+    // C++11 atomics are available and ATOMIC_INT_LOCK_FREE is definitely on
+    #undef __pyx_atomic_int_type
+    #define __pyx_atomic_int_type std::atomic_int
+    #define __pyx_atomic_incr_aligned(value) std::atomic_fetch_add_explicit(value, 1, std::memory_order_relaxed)
+    #define __pyx_atomic_decr_aligned(value) std::atomic_fetch_sub_explicit(value, 1, std::memory_order_acq_rel)
+
+    #if defined(__PYX_DEBUG_ATOMICS) && defined(_MSC_VER)
+        #pragma message ("Using standard C++ atomics")
+    #elif defined(__PYX_DEBUG_ATOMICS)
+        #warning "Using standard C++ atomics"
+    #endif
+#elif CYTHON_ATOMICS && (__GNUC__ >= 5 || (__GNUC__ == 4 && \
+                    (__GNUC_MINOR__ > 1 ||  \
+                    (__GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ >= 2))))
+    /* gcc >= 4.1.2 */
+    #define __pyx_atomic_incr_aligned(value) __sync_fetch_and_add(value, 1)
+    #define __pyx_atomic_decr_aligned(value) __sync_fetch_and_sub(value, 1)
+
+    #ifdef __PYX_DEBUG_ATOMICS
+        #warning "Using GNU atomics"
+    #endif
+#elif CYTHON_ATOMICS && defined(_MSC_VER)
+    /* msvc */
+    #include <intrin.h>
+    #undef __pyx_atomic_int_type
+    #define __pyx_atomic_int_type long
+    #undef __pyx_nonatomic_int_type
+    #define __pyx_nonatomic_int_type long
+    #pragma intrinsic (_InterlockedExchangeAdd)
+    #define __pyx_atomic_incr_aligned(value) _InterlockedExchangeAdd(value, 1)
+    #define __pyx_atomic_decr_aligned(value) _InterlockedExchangeAdd(value, -1)
+
+    #ifdef __PYX_DEBUG_ATOMICS
+        #pragma message ("Using MSVC atomics")
+    #endif
+#else
+    #undef CYTHON_ATOMICS
+    #define CYTHON_ATOMICS 0
+
+    #ifdef __PYX_DEBUG_ATOMICS
+        #warning "Not using atomics"
+    #endif
+#endif
+
+#if CYTHON_ATOMICS
+    #define __pyx_add_acquisition_count(memview) \
+             __pyx_atomic_incr_aligned(__pyx_get_slice_count_pointer(memview))
+    #define __pyx_sub_acquisition_count(memview) \
+            __pyx_atomic_decr_aligned(__pyx_get_slice_count_pointer(memview))
+#else
+    #define __pyx_add_acquisition_count(memview) \
+            __pyx_add_acquisition_count_locked(__pyx_get_slice_count_pointer(memview), memview->lock)
+    #define __pyx_sub_acquisition_count(memview) \
+            __pyx_sub_acquisition_count_locked(__pyx_get_slice_count_pointer(memview), memview->lock)
+#endif
+
+
+/////////////// ObjectToMemviewSlice.proto ///////////////
+
+static CYTHON_INLINE {{memviewslice_name}} {{funcname}}(PyObject *, int writable_flag);
+
+
+////////// MemviewSliceInit.proto //////////
+
+#define __Pyx_BUF_MAX_NDIMS %(BUF_MAX_NDIMS)d
+
+#define __Pyx_MEMVIEW_DIRECT   1
+#define __Pyx_MEMVIEW_PTR      2
+#define __Pyx_MEMVIEW_FULL     4
+#define __Pyx_MEMVIEW_CONTIG   8
+#define __Pyx_MEMVIEW_STRIDED  16
+#define __Pyx_MEMVIEW_FOLLOW   32
+
+#define __Pyx_IS_C_CONTIG 1
+#define __Pyx_IS_F_CONTIG 2
+
+static int __Pyx_init_memviewslice(
+                struct __pyx_memoryview_obj *memview,
+                int ndim,
+                __Pyx_memviewslice *memviewslice,
+                int memview_is_new_reference);
+
+static CYTHON_INLINE int __pyx_add_acquisition_count_locked(
+    __pyx_atomic_int_type *acquisition_count, PyThread_type_lock lock);
+static CYTHON_INLINE int __pyx_sub_acquisition_count_locked(
+    __pyx_atomic_int_type *acquisition_count, PyThread_type_lock lock);
+
+#define __pyx_get_slice_count_pointer(memview) (&memview->acquisition_count)
+#define __PYX_INC_MEMVIEW(slice, have_gil) __Pyx_INC_MEMVIEW(slice, have_gil, __LINE__)
+#define __PYX_XCLEAR_MEMVIEW(slice, have_gil) __Pyx_XCLEAR_MEMVIEW(slice, have_gil, __LINE__)
+static CYTHON_INLINE void __Pyx_INC_MEMVIEW({{memviewslice_name}} *, int, int);
+static CYTHON_INLINE void __Pyx_XCLEAR_MEMVIEW({{memviewslice_name}} *, int, int);
+
+
+/////////////// MemviewSliceIndex.proto ///////////////
+
+static CYTHON_INLINE char *__pyx_memviewslice_index_full(
+    const char *bufp, Py_ssize_t idx, Py_ssize_t stride, Py_ssize_t suboffset);
+
+
+/////////////// ObjectToMemviewSlice ///////////////
+//@requires: MemviewSliceValidateAndInit
+
+static CYTHON_INLINE {{memviewslice_name}} {{funcname}}(PyObject *obj, int writable_flag) {
+    {{memviewslice_name}} result = {{memslice_init}};
+    __Pyx_BufFmt_StackElem stack[{{struct_nesting_depth}}];
+    int axes_specs[] = { {{axes_specs}} };
+    int retcode;
+
+    if (obj == Py_None) {
+        /* We don't bother to refcount None */
+        result.memview = (struct __pyx_memoryview_obj *) Py_None;
+        return result;
+    }
+
+    retcode = __Pyx_ValidateAndInit_memviewslice(axes_specs, {{c_or_f_flag}},
+                                                 {{buf_flag}} | writable_flag, {{ndim}},
+                                                 &{{dtype_typeinfo}}, stack,
+                                                 &result, obj);
+
+    if (unlikely(retcode == -1))
+        goto __pyx_fail;
+
+    return result;
+__pyx_fail:
+    result.memview = NULL;
+    result.data = NULL;
+    return result;
+}
+
+
+/////////////// MemviewSliceValidateAndInit.proto ///////////////
+
+static int __Pyx_ValidateAndInit_memviewslice(
+                int *axes_specs,
+                int c_or_f_flag,
+                int buf_flags,
+                int ndim,
+                __Pyx_TypeInfo *dtype,
+                __Pyx_BufFmt_StackElem stack[],
+                __Pyx_memviewslice *memviewslice,
+                PyObject *original_obj);
+
+/////////////// MemviewSliceValidateAndInit ///////////////
+//@requires: Buffer.c::TypeInfoCompare
+//@requires: Buffer.c::BufferFormatStructs
+//@requires: Buffer.c::BufferFormatCheck
+
+static int
+__pyx_check_strides(Py_buffer *buf, int dim, int ndim, int spec)
+{
+    if (buf->shape[dim] <= 1)
+        return 1;
+
+    if (buf->strides) {
+        if (spec & __Pyx_MEMVIEW_CONTIG) {
+            if (spec & (__Pyx_MEMVIEW_PTR|__Pyx_MEMVIEW_FULL)) {
+                if (unlikely(buf->strides[dim] != sizeof(void *))) {
+                    PyErr_Format(PyExc_ValueError,
+                                 "Buffer is not indirectly contiguous "
+                                 "in dimension %d.", dim);
+                    goto fail;
+                }
+            } else if (unlikely(buf->strides[dim] != buf->itemsize)) {
+                PyErr_SetString(PyExc_ValueError,
+                                "Buffer and memoryview are not contiguous "
+                                "in the same dimension.");
+                goto fail;
+            }
+        }
+
+        if (spec & __Pyx_MEMVIEW_FOLLOW) {
+            Py_ssize_t stride = buf->strides[dim];
+            if (stride < 0)
+                stride = -stride;
+            if (unlikely(stride < buf->itemsize)) {
+                PyErr_SetString(PyExc_ValueError,
+                                "Buffer and memoryview are not contiguous "
+                                "in the same dimension.");
+                goto fail;
+            }
+        }
+    } else {
+        if (unlikely(spec & __Pyx_MEMVIEW_CONTIG && dim != ndim - 1)) {
+            PyErr_Format(PyExc_ValueError,
+                         "C-contiguous buffer is not contiguous in "
+                         "dimension %d", dim);
+            goto fail;
+        } else if (unlikely(spec & (__Pyx_MEMVIEW_PTR))) {
+            PyErr_Format(PyExc_ValueError,
+                         "C-contiguous buffer is not indirect in "
+                         "dimension %d", dim);
+            goto fail;
+        } else if (unlikely(buf->suboffsets)) {
+            PyErr_SetString(PyExc_ValueError,
+                            "Buffer exposes suboffsets but no strides");
+            goto fail;
+        }
+    }
+
+    return 1;
+fail:
+    return 0;
+}
+
+static int
+__pyx_check_suboffsets(Py_buffer *buf, int dim, int ndim, int spec)
+{
+    CYTHON_UNUSED_VAR(ndim);
+    // Todo: without PyBUF_INDIRECT we may not have suboffset information, i.e., the
+    //       ptr may not be set to NULL but may be uninitialized?
+    if (spec & __Pyx_MEMVIEW_DIRECT) {
+        if (unlikely(buf->suboffsets && buf->suboffsets[dim] >= 0)) {
+            PyErr_Format(PyExc_ValueError,
+                         "Buffer not compatible with direct access "
+                         "in dimension %d.", dim);
+            goto fail;
+        }
+    }
+
+    if (spec & __Pyx_MEMVIEW_PTR) {
+        if (unlikely(!buf->suboffsets || (buf->suboffsets[dim] < 0))) {
+            PyErr_Format(PyExc_ValueError,
+                         "Buffer is not indirectly accessible "
+                         "in dimension %d.", dim);
+            goto fail;
+        }
+    }
+
+    return 1;
+fail:
+    return 0;
+}
+
+static int
+__pyx_verify_contig(Py_buffer *buf, int ndim, int c_or_f_flag)
+{
+    int i;
+
+    if (c_or_f_flag & __Pyx_IS_F_CONTIG) {
+        Py_ssize_t stride = 1;
+        for (i = 0; i < ndim; i++) {
+            if (unlikely(stride * buf->itemsize != buf->strides[i]  &&  buf->shape[i] > 1)) {
+                PyErr_SetString(PyExc_ValueError,
+                    "Buffer not fortran contiguous.");
+                goto fail;
+            }
+            stride = stride * buf->shape[i];
+        }
+    } else if (c_or_f_flag & __Pyx_IS_C_CONTIG) {
+        Py_ssize_t stride = 1;
+        for (i = ndim - 1; i >- 1; i--) {
+            if (unlikely(stride * buf->itemsize != buf->strides[i]  &&  buf->shape[i] > 1)) {
+                PyErr_SetString(PyExc_ValueError,
+                    "Buffer not C contiguous.");
+                goto fail;
+            }
+            stride = stride * buf->shape[i];
+        }
+    }
+
+    return 1;
+fail:
+    return 0;
+}
+
+static int __Pyx_ValidateAndInit_memviewslice(
+                int *axes_specs,
+                int c_or_f_flag,
+                int buf_flags,
+                int ndim,
+                __Pyx_TypeInfo *dtype,
+                __Pyx_BufFmt_StackElem stack[],
+                __Pyx_memviewslice *memviewslice,
+                PyObject *original_obj)
+{
+    struct __pyx_memoryview_obj *memview, *new_memview;
+    __Pyx_RefNannyDeclarations
+    Py_buffer *buf;
+    int i, spec = 0, retval = -1;
+    __Pyx_BufFmt_Context ctx;
+    int from_memoryview = __pyx_memoryview_check(original_obj);
+
+    __Pyx_RefNannySetupContext("ValidateAndInit_memviewslice", 0);
+
+    if (from_memoryview && __pyx_typeinfo_cmp(dtype, ((struct __pyx_memoryview_obj *)
+                                                            original_obj)->typeinfo)) {
+        /* We have a matching dtype, skip format parsing */
+        memview = (struct __pyx_memoryview_obj *) original_obj;
+        new_memview = NULL;
+    } else {
+        memview = (struct __pyx_memoryview_obj *) __pyx_memoryview_new(
+                                            original_obj, buf_flags, 0, dtype);
+        new_memview = memview;
+        if (unlikely(!memview))
+            goto fail;
+    }
+
+    buf = &memview->view;
+    if (unlikely(buf->ndim != ndim)) {
+        PyErr_Format(PyExc_ValueError,
+                "Buffer has wrong number of dimensions (expected %d, got %d)",
+                ndim, buf->ndim);
+        goto fail;
+    }
+
+    if (new_memview) {
+        __Pyx_BufFmt_Init(&ctx, stack, dtype);
+        if (unlikely(!__Pyx_BufFmt_CheckString(&ctx, buf->format))) goto fail;
+    }
+
+    if (unlikely((unsigned) buf->itemsize != dtype->size)) {
+        PyErr_Format(PyExc_ValueError,
+                     "Item size of buffer (%" CYTHON_FORMAT_SSIZE_T "u byte%s) "
+                     "does not match size of '%s' (%" CYTHON_FORMAT_SSIZE_T "u byte%s)",
+                     buf->itemsize,
+                     (buf->itemsize > 1) ? "s" : "",
+                     dtype->name,
+                     dtype->size,
+                     (dtype->size > 1) ? "s" : "");
+        goto fail;
+    }
+
+    /* Check axes */
+    if (buf->len > 0) {
+        // 0-sized arrays do not undergo these checks since their strides are
+        // irrelevant and they are always both C- and F-contiguous.
+        for (i = 0; i < ndim; i++) {
+            spec = axes_specs[i];
+            if (unlikely(!__pyx_check_strides(buf, i, ndim, spec)))
+                goto fail;
+            if (unlikely(!__pyx_check_suboffsets(buf, i, ndim, spec)))
+                goto fail;
+        }
+
+        /* Check contiguity */
+        if (unlikely(buf->strides && !__pyx_verify_contig(buf, ndim, c_or_f_flag)))
+            goto fail;
+    }
+
+    /* Initialize */
+    if (unlikely(__Pyx_init_memviewslice(memview, ndim, memviewslice,
+                                         new_memview != NULL) == -1)) {
+        goto fail;
+    }
+
+    retval = 0;
+    goto no_fail;
+
+fail:
+    Py_XDECREF(new_memview);
+    retval = -1;
+
+no_fail:
+    __Pyx_RefNannyFinishContext();
+    return retval;
+}
+
+
+////////// MemviewSliceInit //////////
+
+static int
+__Pyx_init_memviewslice(struct __pyx_memoryview_obj *memview,
+                        int ndim,
+                        {{memviewslice_name}} *memviewslice,
+                        int memview_is_new_reference)
+{
+    __Pyx_RefNannyDeclarations
+    int i, retval=-1;
+    Py_buffer *buf = &memview->view;
+    __Pyx_RefNannySetupContext("init_memviewslice", 0);
+
+    if (unlikely(memviewslice->memview || memviewslice->data)) {
+        PyErr_SetString(PyExc_ValueError,
+            "memviewslice is already initialized!");
+        goto fail;
+    }
+
+    if (buf->strides) {
+        for (i = 0; i < ndim; i++) {
+            memviewslice->strides[i] = buf->strides[i];
+        }
+    } else {
+        Py_ssize_t stride = buf->itemsize;
+        for (i = ndim - 1; i >= 0; i--) {
+            memviewslice->strides[i] = stride;
+            stride *= buf->shape[i];
+        }
+    }
+
+    for (i = 0; i < ndim; i++) {
+        memviewslice->shape[i]   = buf->shape[i];
+        if (buf->suboffsets) {
+            memviewslice->suboffsets[i] = buf->suboffsets[i];
+        } else {
+            memviewslice->suboffsets[i] = -1;
+        }
+    }
+
+    memviewslice->memview = memview;
+    memviewslice->data = (char *)buf->buf;
+    if (__pyx_add_acquisition_count(memview) == 0 && !memview_is_new_reference) {
+        Py_INCREF(memview);
+    }
+    retval = 0;
+    goto no_fail;
+
+fail:
+    /* Don't decref, the memoryview may be borrowed. Let the caller do the cleanup */
+    /* __Pyx_XDECREF(memviewslice->memview); */
+    memviewslice->memview = 0;
+    memviewslice->data = 0;
+    retval = -1;
+no_fail:
+    __Pyx_RefNannyFinishContext();
+    return retval;
+}
+
+#ifndef Py_NO_RETURN
+// available since Py3.3
+#define Py_NO_RETURN
+#endif
+
+static void __pyx_fatalerror(const char *fmt, ...) Py_NO_RETURN {
+    va_list vargs;
+    char msg[200];
+
+#if PY_VERSION_HEX >= 0x030A0000 || defined(HAVE_STDARG_PROTOTYPES)
+    va_start(vargs, fmt);
+#else
+    va_start(vargs);
+#endif
+    vsnprintf(msg, 200, fmt, vargs);
+    va_end(vargs);
+
+    Py_FatalError(msg);
+}
+
+static CYTHON_INLINE int
+__pyx_add_acquisition_count_locked(__pyx_atomic_int_type *acquisition_count,
+                                   PyThread_type_lock lock)
+{
+    int result;
+    PyThread_acquire_lock(lock, 1);
+    result = (*acquisition_count)++;
+    PyThread_release_lock(lock);
+    return result;
+}
+
+static CYTHON_INLINE int
+__pyx_sub_acquisition_count_locked(__pyx_atomic_int_type *acquisition_count,
+                                   PyThread_type_lock lock)
+{
+    int result;
+    PyThread_acquire_lock(lock, 1);
+    result = (*acquisition_count)--;
+    PyThread_release_lock(lock);
+    return result;
+}
+
+
+static CYTHON_INLINE void
+__Pyx_INC_MEMVIEW({{memviewslice_name}} *memslice, int have_gil, int lineno)
+{
+    __pyx_nonatomic_int_type old_acquisition_count;
+    struct {{memview_struct_name}} *memview = memslice->memview;
+    if (unlikely(!memview || (PyObject *) memview == Py_None)) {
+        // Allow uninitialized memoryview assignment and do not ref-count None.
+        return;
+    }
+
+    old_acquisition_count = __pyx_add_acquisition_count(memview);
+    if (unlikely(old_acquisition_count <= 0)) {
+        if (likely(old_acquisition_count == 0)) {
+            // First acquisition => keep the memoryview object alive.
+            if (have_gil) {
+                Py_INCREF((PyObject *) memview);
+            } else {
+                PyGILState_STATE _gilstate = PyGILState_Ensure();
+                Py_INCREF((PyObject *) memview);
+                PyGILState_Release(_gilstate);
+            }
+        } else {
+            __pyx_fatalerror("Acquisition count is %d (line %d)",
+                             old_acquisition_count+1, lineno);
+        }
+    }
+}
+
+static CYTHON_INLINE void __Pyx_XCLEAR_MEMVIEW({{memviewslice_name}} *memslice,
+                                             int have_gil, int lineno) {
+    __pyx_nonatomic_int_type old_acquisition_count;
+    struct {{memview_struct_name}} *memview = memslice->memview;
+
+    if (unlikely(!memview || (PyObject *) memview == Py_None)) {
+        // Do not ref-count None.
+        memslice->memview = NULL;
+        return;
+    }
+
+    old_acquisition_count = __pyx_sub_acquisition_count(memview);
+    memslice->data = NULL;
+    if (likely(old_acquisition_count > 1)) {
+        // Still other slices out there => we do not own the reference.
+        memslice->memview = NULL;
+    } else if (likely(old_acquisition_count == 1)) {
+        // Last slice => discard owned Python reference to memoryview object.
+        if (have_gil) {
+            Py_CLEAR(memslice->memview);
+        } else {
+            PyGILState_STATE _gilstate = PyGILState_Ensure();
+            Py_CLEAR(memslice->memview);
+            PyGILState_Release(_gilstate);
+        }
+    } else {
+        __pyx_fatalerror("Acquisition count is %d (line %d)",
+                         old_acquisition_count-1, lineno);
+    }
+}
+
+
+////////// MemviewSliceCopyTemplate.proto //////////
+
+static {{memviewslice_name}}
+__pyx_memoryview_copy_new_contig(const __Pyx_memviewslice *from_mvs,
+                                 const char *mode, int ndim,
+                                 size_t sizeof_dtype, int contig_flag,
+                                 int dtype_is_object);
+
+
+////////// MemviewSliceCopyTemplate //////////
+
+static {{memviewslice_name}}
+__pyx_memoryview_copy_new_contig(const __Pyx_memviewslice *from_mvs,
+                                 const char *mode, int ndim,
+                                 size_t sizeof_dtype, int contig_flag,
+                                 int dtype_is_object)
+{
+    __Pyx_RefNannyDeclarations
+    int i;
+    __Pyx_memviewslice new_mvs = {{memslice_init}};
+    struct __pyx_memoryview_obj *from_memview = from_mvs->memview;
+    Py_buffer *buf = &from_memview->view;
+    PyObject *shape_tuple = NULL;
+    PyObject *temp_int = NULL;
+    struct __pyx_array_obj *array_obj = NULL;
+    struct __pyx_memoryview_obj *memview_obj = NULL;
+
+    __Pyx_RefNannySetupContext("__pyx_memoryview_copy_new_contig", 0);
+
+    for (i = 0; i < ndim; i++) {
+        if (unlikely(from_mvs->suboffsets[i] >= 0)) {
+            PyErr_Format(PyExc_ValueError, "Cannot copy memoryview slice with "
+                                           "indirect dimensions (axis %d)", i);
+            goto fail;
+        }
+    }
+
+    shape_tuple = PyTuple_New(ndim);
+    if (unlikely(!shape_tuple)) {
+        goto fail;
+    }
+    __Pyx_GOTREF(shape_tuple);
+
+
+    for(i = 0; i < ndim; i++) {
+        temp_int = PyInt_FromSsize_t(from_mvs->shape[i]);
+        if(unlikely(!temp_int)) {
+            goto fail;
+        } else {
+            PyTuple_SET_ITEM(shape_tuple, i, temp_int);
+            temp_int = NULL;
+        }
+    }
+
+    array_obj = __pyx_array_new(shape_tuple, sizeof_dtype, buf->format, (char *) mode, NULL);
+    if (unlikely(!array_obj)) {
+        goto fail;
+    }
+    __Pyx_GOTREF(array_obj);
+
+    memview_obj = (struct __pyx_memoryview_obj *) __pyx_memoryview_new(
+                                    (PyObject *) array_obj, contig_flag,
+                                    dtype_is_object,
+                                    from_mvs->memview->typeinfo);
+    if (unlikely(!memview_obj))
+        goto fail;
+
+    /* initialize new_mvs */
+    if (unlikely(__Pyx_init_memviewslice(memview_obj, ndim, &new_mvs, 1) < 0))
+        goto fail;
+
+    if (unlikely(__pyx_memoryview_copy_contents(*from_mvs, new_mvs, ndim, ndim,
+                                                dtype_is_object) < 0))
+        goto fail;
+
+    goto no_fail;
+
+fail:
+    __Pyx_XDECREF(new_mvs.memview);
+    new_mvs.memview = NULL;
+    new_mvs.data = NULL;
+no_fail:
+    __Pyx_XDECREF(shape_tuple);
+    __Pyx_XDECREF(temp_int);
+    __Pyx_XDECREF(array_obj);
+    __Pyx_RefNannyFinishContext();
+    return new_mvs;
+}
+
+
+////////// CopyContentsUtility.proto /////////
+
+#define {{func_cname}}(slice) \
+        __pyx_memoryview_copy_new_contig(&slice, "{{mode}}", {{ndim}},            \
+                                         sizeof({{dtype_decl}}), {{contig_flag}}, \
+                                         {{dtype_is_object}})
+
+
+////////// OverlappingSlices.proto //////////
+
+static int __pyx_slices_overlap({{memviewslice_name}} *slice1,
+                                {{memviewslice_name}} *slice2,
+                                int ndim, size_t itemsize);
+
+
+////////// OverlappingSlices //////////
+
+/* Based on numpy's core/src/multiarray/array_assign.c */
+
+/* Gets a half-open range [start, end) which contains the array data */
+static void
+__pyx_get_array_memory_extents({{memviewslice_name}} *slice,
+                               void **out_start, void **out_end,
+                               int ndim, size_t itemsize)
+{
+    char *start, *end;
+    int i;
+
+    start = end = slice->data;
+
+    for (i = 0; i < ndim; i++) {
+        Py_ssize_t stride = slice->strides[i];
+        Py_ssize_t extent = slice->shape[i];
+
+        if (extent == 0) {
+            *out_start = *out_end = start;
+            return;
+        } else {
+            if (stride > 0)
+                end += stride * (extent - 1);
+            else
+                start += stride * (extent - 1);
+        }
+    }
+
+    /* Return a half-open range */
+    *out_start = start;
+    *out_end = end + itemsize;
+}
+
+/* Returns 1 if the arrays have overlapping data, 0 otherwise */
+static int
+__pyx_slices_overlap({{memviewslice_name}} *slice1,
+                     {{memviewslice_name}} *slice2,
+                     int ndim, size_t itemsize)
+{
+    void *start1, *end1, *start2, *end2;
+
+    __pyx_get_array_memory_extents(slice1, &start1, &end1, ndim, itemsize);
+    __pyx_get_array_memory_extents(slice2, &start2, &end2, ndim, itemsize);
+
+    return (start1 < end2) && (start2 < end1);
+}
+
+
+////////// MemviewSliceCheckContig.proto //////////
+
+#define __pyx_memviewslice_is_contig_{{contig_type}}{{ndim}}(slice) \
+    __pyx_memviewslice_is_contig(slice, '{{contig_type}}', {{ndim}})
+
+
+////////// MemviewSliceIsContig.proto //////////
+
+static int __pyx_memviewslice_is_contig(const {{memviewslice_name}} mvs, char order, int ndim);/*proto*/
+
+
+////////// MemviewSliceIsContig //////////
+
+static int
+__pyx_memviewslice_is_contig(const {{memviewslice_name}} mvs, char order, int ndim)
+{
+    int i, index, step, start;
+    Py_ssize_t itemsize = mvs.memview->view.itemsize;
+
+    if (order == 'F') {
+        step = 1;
+        start = 0;
+    } else {
+        step = -1;
+        start = ndim - 1;
+    }
+
+    for (i = 0; i < ndim; i++) {
+        index = start + step * i;
+        if (mvs.suboffsets[index] >= 0 || mvs.strides[index] != itemsize)
+            return 0;
+
+        itemsize *= mvs.shape[index];
+    }
+
+    return 1;
+}
+
+
+/////////////// MemviewSliceIndex ///////////////
+
+static CYTHON_INLINE char *
+__pyx_memviewslice_index_full(const char *bufp, Py_ssize_t idx,
+                              Py_ssize_t stride, Py_ssize_t suboffset)
+{
+    bufp = bufp + idx * stride;
+    if (suboffset >= 0) {
+        bufp = *((char **) bufp) + suboffset;
+    }
+    return (char *) bufp;
+}
+
+
+/////////////// MemviewDtypeToObject.proto ///////////////
+
+{{if to_py_function}}
+static CYTHON_INLINE PyObject *{{get_function}}(const char *itemp); /* proto */
+{{endif}}
+
+{{if from_py_function}}
+static CYTHON_INLINE int {{set_function}}(const char *itemp, PyObject *obj); /* proto */
+{{endif}}
+
+/////////////// MemviewDtypeToObject ///////////////
+
+{{#__pyx_memview_<dtype_name>_to_object}}
+
+/* Convert a dtype to or from a Python object */
+
+{{if to_py_function}}
+static CYTHON_INLINE PyObject *{{get_function}}(const char *itemp) {
+    return (PyObject *) {{to_py_function}}(*({{dtype}} *) itemp);
+}
+{{endif}}
+
+{{if from_py_function}}
+static CYTHON_INLINE int {{set_function}}(const char *itemp, PyObject *obj) {
+    {{dtype}} value = {{from_py_function}}(obj);
+    if (unlikely({{error_condition}}))
+        return 0;
+    *({{dtype}} *) itemp = value;
+    return 1;
+}
+{{endif}}
+
+
+/////////////// MemviewObjectToObject.proto ///////////////
+
+/* Function callbacks (for memoryview object) for dtype object */
+static PyObject *{{get_function}}(const char *itemp); /* proto */
+static int {{set_function}}(const char *itemp, PyObject *obj); /* proto */
+
+
+/////////////// MemviewObjectToObject ///////////////
+
+static PyObject *{{get_function}}(const char *itemp) {
+    PyObject *result = *(PyObject **) itemp;
+    Py_INCREF(result);
+    return result;
+}
+
+static int {{set_function}}(const char *itemp, PyObject *obj) {
+    Py_INCREF(obj);
+    Py_DECREF(*(PyObject **) itemp);
+    *(PyObject **) itemp = obj;
+    return 1;
+}
+
+/////////// ToughSlice //////////
+
+/* Dimension is indexed with 'start:stop:step' */
+
+if (unlikely(__pyx_memoryview_slice_memviewslice(
+    &{{dst}},
+    {{src}}.shape[{{dim}}], {{src}}.strides[{{dim}}], {{src}}.suboffsets[{{dim}}],
+    {{dim}},
+    {{new_ndim}},
+    &{{get_suboffset_dim()}},
+    {{start}},
+    {{stop}},
+    {{step}},
+    {{int(have_start)}},
+    {{int(have_stop)}},
+    {{int(have_step)}},
+    1) < 0))
+{
+    {{error_goto}}
+}
+
+
+////////// SimpleSlice //////////
+
+/* Dimension is indexed with ':' only */
+
+{{dst}}.shape[{{new_ndim}}] = {{src}}.shape[{{dim}}];
+{{dst}}.strides[{{new_ndim}}] = {{src}}.strides[{{dim}}];
+
+{{if access == 'direct'}}
+    {{dst}}.suboffsets[{{new_ndim}}] = -1;
+{{else}}
+    {{dst}}.suboffsets[{{new_ndim}}] = {{src}}.suboffsets[{{dim}}];
+    if ({{src}}.suboffsets[{{dim}}] >= 0)
+        {{get_suboffset_dim()}} = {{new_ndim}};
+{{endif}}
+
+
+////////// SliceIndex //////////
+
+// Dimension is indexed with an integer, we could use the ToughSlice
+// approach, but this is faster
+
+{
+    Py_ssize_t __pyx_tmp_idx = {{idx}};
+
+    {{if wraparound or boundscheck}}
+        Py_ssize_t __pyx_tmp_shape = {{src}}.shape[{{dim}}];
+    {{endif}}
+
+    Py_ssize_t __pyx_tmp_stride = {{src}}.strides[{{dim}}];
+    {{if wraparound}}
+        if (__pyx_tmp_idx < 0)
+            __pyx_tmp_idx += __pyx_tmp_shape;
+    {{endif}}
+
+    {{if boundscheck}}
+        if (unlikely(!__Pyx_is_valid_index(__pyx_tmp_idx, __pyx_tmp_shape))) {
+            {{if not have_gil}}
+                #ifdef WITH_THREAD
+                PyGILState_STATE __pyx_gilstate_save = PyGILState_Ensure();
+                #endif
+            {{endif}}
+
+            PyErr_SetString(PyExc_IndexError,
+                            "Index out of bounds (axis {{dim}})");
+
+            {{if not have_gil}}
+                #ifdef WITH_THREAD
+                PyGILState_Release(__pyx_gilstate_save);
+                #endif
+            {{endif}}
+
+            {{error_goto}}
+        }
+    {{endif}}
+
+    {{if all_dimensions_direct}}
+        {{dst}}.data += __pyx_tmp_idx * __pyx_tmp_stride;
+    {{else}}
+        if ({{get_suboffset_dim()}} < 0) {
+            {{dst}}.data += __pyx_tmp_idx * __pyx_tmp_stride;
+
+            /* This dimension is the first dimension, or is preceded by    */
+            /* direct or indirect dimensions that are indexed away.        */
+            /* Hence suboffset_dim must be less than zero, and we can have */
+            /* our data pointer refer to another block by dereferencing.   */
+            /*   slice.data -> B -> C     becomes     slice.data -> C      */
+
+            {{if indirect}}
+              {
+                Py_ssize_t __pyx_tmp_suboffset = {{src}}.suboffsets[{{dim}}];
+
+                {{if generic}}
+                    if (__pyx_tmp_suboffset >= 0)
+                {{endif}}
+
+                    {{dst}}.data = *((char **) {{dst}}.data) + __pyx_tmp_suboffset;
+              }
+            {{endif}}
+
+        } else {
+            {{dst}}.suboffsets[{{get_suboffset_dim()}}] += __pyx_tmp_idx * __pyx_tmp_stride;
+
+            /* Note: dimension can not be indirect, the compiler will have */
+            /*       issued an error */
+        }
+
+    {{endif}}
+}
+
+
+////////// FillStrided1DScalar.proto //////////
+
+static void
+__pyx_fill_slice_{{dtype_name}}({{type_decl}} *p, Py_ssize_t extent, Py_ssize_t stride,
+                                size_t itemsize, void *itemp);
+
+////////// FillStrided1DScalar //////////
+
+/* Fill a slice with a scalar value. The dimension is direct and strided or contiguous */
+/* This can be used as a callback for the memoryview object to efficiently assign a scalar */
+/* Currently unused */
+static void
+__pyx_fill_slice_{{dtype_name}}({{type_decl}} *p, Py_ssize_t extent, Py_ssize_t stride,
+                                size_t itemsize, void *itemp)
+{
+    Py_ssize_t i;
+    {{type_decl}} item = *(({{type_decl}} *) itemp);
+    {{type_decl}} *endp;
+
+    stride /= sizeof({{type_decl}});
+    endp = p + stride * extent;
+
+    while (p < endp) {
+        *p = item;
+        p += stride;
+    }
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/ModuleSetupCode.c b/contrib/tools/cython_py2/Cython/Utility/ModuleSetupCode.c
new file mode 100644
index 00000000000..6162139b12b
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/ModuleSetupCode.c
@@ -0,0 +1,2376 @@
+/////////////// InitLimitedAPI ///////////////
+
+#if defined(CYTHON_LIMITED_API) && 0  /* disabled: enabling Py_LIMITED_API needs more work */
+  #ifndef Py_LIMITED_API
+    #if CYTHON_LIMITED_API+0 > 0x03030000
+      #define Py_LIMITED_API CYTHON_LIMITED_API
+    #else
+      #define Py_LIMITED_API 0x03030000
+    #endif
+  #endif
+#endif
+
+
+/////////////// CModulePreamble ///////////////
+
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wshadow"
+#pragma GCC diagnostic ignored "-Wunused-function"
+#if PY_VERSION_HEX >= 0x030800b4 && PY_VERSION_HEX < 0x03090000
+// Ignore tp_print initializer. Need for ya make -DUSE_SYSTEM_PYTHON=3.8
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+#endif
+
+#include <stddef.h> /* For offsetof */
+#ifndef offsetof
+  #define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
+#endif
+
+#if !defined(_WIN32) && !defined(WIN32) && !defined(MS_WINDOWS)
+  #ifndef __stdcall
+    #define __stdcall
+  #endif
+  #ifndef __cdecl
+    #define __cdecl
+  #endif
+  #ifndef __fastcall
+    #define __fastcall
+  #endif
+#endif
+
+#ifndef DL_IMPORT
+  #define DL_IMPORT(t) t
+#endif
+#ifndef DL_EXPORT
+  #define DL_EXPORT(t) t
+#endif
+
+// For use in DL_IMPORT/DL_EXPORT macros.
+#define __PYX_COMMA ,
+
+#ifndef HAVE_LONG_LONG
+  // CPython has required PY_LONG_LONG support for years, even if HAVE_LONG_LONG is not defined for us
+  #define HAVE_LONG_LONG
+#endif
+
+#ifndef PY_LONG_LONG
+  #define PY_LONG_LONG LONG_LONG
+#endif
+
+#ifndef Py_HUGE_VAL
+  #define Py_HUGE_VAL HUGE_VAL
+#endif
+
+// For the limited API it often makes sense to use Py_LIMITED_API rather than PY_VERSION_HEX
+// when doing version checks.
+#define __PYX_LIMITED_VERSION_HEX PY_VERSION_HEX
+
+#if defined(GRAALVM_PYTHON)
+  /* For very preliminary testing purposes. Most variables are set the same as PyPy.
+     The existence of this section does not imply that anything works or is even tested */
+  // GRAALVM_PYTHON test comes before PyPy test because GraalPython unhelpfully defines PYPY_VERSION
+  #define CYTHON_COMPILING_IN_PYPY 0
+  #define CYTHON_COMPILING_IN_CPYTHON 0
+  #define CYTHON_COMPILING_IN_LIMITED_API 0
+  #define CYTHON_COMPILING_IN_GRAAL 1
+  #define CYTHON_COMPILING_IN_NOGIL 0
+
+  #undef CYTHON_USE_TYPE_SLOTS
+  #define CYTHON_USE_TYPE_SLOTS 0
+  #undef CYTHON_USE_TYPE_SPECS
+  #define CYTHON_USE_TYPE_SPECS 0
+  #undef CYTHON_USE_PYTYPE_LOOKUP
+  #define CYTHON_USE_PYTYPE_LOOKUP 0
+  #if PY_VERSION_HEX < 0x03050000
+    #undef CYTHON_USE_ASYNC_SLOTS
+    #define CYTHON_USE_ASYNC_SLOTS 0
+  #elif !defined(CYTHON_USE_ASYNC_SLOTS)
+    #define CYTHON_USE_ASYNC_SLOTS 1
+  #endif
+  #undef CYTHON_USE_PYLIST_INTERNALS
+  #define CYTHON_USE_PYLIST_INTERNALS 0
+  #undef CYTHON_USE_UNICODE_INTERNALS
+  #define CYTHON_USE_UNICODE_INTERNALS 0
+  #undef CYTHON_USE_UNICODE_WRITER
+  #define CYTHON_USE_UNICODE_WRITER 0
+  #undef CYTHON_USE_PYLONG_INTERNALS
+  #define CYTHON_USE_PYLONG_INTERNALS 0
+  #undef CYTHON_AVOID_BORROWED_REFS
+  #define CYTHON_AVOID_BORROWED_REFS 1
+  #undef CYTHON_ASSUME_SAFE_MACROS
+  #define CYTHON_ASSUME_SAFE_MACROS 0
+  #undef CYTHON_UNPACK_METHODS
+  #define CYTHON_UNPACK_METHODS 0
+  #undef CYTHON_FAST_THREAD_STATE
+  #define CYTHON_FAST_THREAD_STATE 0
+  #undef CYTHON_FAST_GIL
+  #define CYTHON_FAST_GIL 0
+  #undef CYTHON_METH_FASTCALL
+  #define CYTHON_METH_FASTCALL 0
+  #undef CYTHON_FAST_PYCALL
+  #define CYTHON_FAST_PYCALL 0
+  #ifndef CYTHON_PEP487_INIT_SUBCLASS
+    #define CYTHON_PEP487_INIT_SUBCLASS (PY_MAJOR_VERSION >= 3)
+  #endif
+  #undef CYTHON_PEP489_MULTI_PHASE_INIT
+  #define CYTHON_PEP489_MULTI_PHASE_INIT 1
+  #undef CYTHON_USE_MODULE_STATE
+  #define CYTHON_USE_MODULE_STATE 0
+  #undef CYTHON_USE_TP_FINALIZE
+  #define CYTHON_USE_TP_FINALIZE 0
+  #undef CYTHON_USE_DICT_VERSIONS
+  #define CYTHON_USE_DICT_VERSIONS 0
+  #undef CYTHON_USE_EXC_INFO_STACK
+  #define CYTHON_USE_EXC_INFO_STACK 0
+  #ifndef CYTHON_UPDATE_DESCRIPTOR_DOC
+    #define CYTHON_UPDATE_DESCRIPTOR_DOC 0
+  #endif
+  #undef CYTHON_USE_FREELISTS
+  #define CYTHON_USE_FREELISTS 0
+
+#elif defined(PYPY_VERSION)
+  #define CYTHON_COMPILING_IN_PYPY 1
+  #define CYTHON_COMPILING_IN_CPYTHON 0
+  #define CYTHON_COMPILING_IN_LIMITED_API 0
+  #define CYTHON_COMPILING_IN_GRAAL 0
+  #define CYTHON_COMPILING_IN_NOGIL 0
+
+  #undef CYTHON_USE_TYPE_SLOTS
+  #define CYTHON_USE_TYPE_SLOTS 0
+  #ifndef CYTHON_USE_TYPE_SPECS
+    #define CYTHON_USE_TYPE_SPECS 0
+  #endif
+  #undef CYTHON_USE_PYTYPE_LOOKUP
+  #define CYTHON_USE_PYTYPE_LOOKUP 0
+  #if PY_VERSION_HEX < 0x03050000
+    #undef CYTHON_USE_ASYNC_SLOTS
+    #define CYTHON_USE_ASYNC_SLOTS 0
+  #elif !defined(CYTHON_USE_ASYNC_SLOTS)
+    #define CYTHON_USE_ASYNC_SLOTS 1
+  #endif
+  #undef CYTHON_USE_PYLIST_INTERNALS
+  #define CYTHON_USE_PYLIST_INTERNALS 0
+  #undef CYTHON_USE_UNICODE_INTERNALS
+  #define CYTHON_USE_UNICODE_INTERNALS 0
+  #undef CYTHON_USE_UNICODE_WRITER
+  #define CYTHON_USE_UNICODE_WRITER 0
+  #undef CYTHON_USE_PYLONG_INTERNALS
+  #define CYTHON_USE_PYLONG_INTERNALS 0
+  #undef CYTHON_AVOID_BORROWED_REFS
+  #define CYTHON_AVOID_BORROWED_REFS 1
+  #undef CYTHON_ASSUME_SAFE_MACROS
+  #define CYTHON_ASSUME_SAFE_MACROS 0
+  #undef CYTHON_UNPACK_METHODS
+  #define CYTHON_UNPACK_METHODS 0
+  #undef CYTHON_FAST_THREAD_STATE
+  #define CYTHON_FAST_THREAD_STATE 0
+  #undef CYTHON_FAST_GIL
+  #define CYTHON_FAST_GIL 0
+  #undef CYTHON_METH_FASTCALL
+  #define CYTHON_METH_FASTCALL 0
+  #undef CYTHON_FAST_PYCALL
+  #define CYTHON_FAST_PYCALL 0
+  #ifndef CYTHON_PEP487_INIT_SUBCLASS
+    #define CYTHON_PEP487_INIT_SUBCLASS (PY_MAJOR_VERSION >= 3)
+  #endif
+  #if PY_VERSION_HEX < 0x03090000
+    #undef CYTHON_PEP489_MULTI_PHASE_INIT
+    #define CYTHON_PEP489_MULTI_PHASE_INIT 0
+  #elif !defined(CYTHON_PEP489_MULTI_PHASE_INIT)
+    #define CYTHON_PEP489_MULTI_PHASE_INIT 1
+  #endif
+  #undef CYTHON_USE_MODULE_STATE
+  #define CYTHON_USE_MODULE_STATE 0
+  #undef CYTHON_USE_TP_FINALIZE
+  #define CYTHON_USE_TP_FINALIZE (PY_VERSION_HEX >= 0x030400a1 && PYPY_VERSION_NUM >= 0x07030C00)
+  #undef CYTHON_USE_DICT_VERSIONS
+  #define CYTHON_USE_DICT_VERSIONS 0
+  #undef CYTHON_USE_EXC_INFO_STACK
+  #define CYTHON_USE_EXC_INFO_STACK 0
+  #ifndef CYTHON_UPDATE_DESCRIPTOR_DOC
+    #define CYTHON_UPDATE_DESCRIPTOR_DOC 0
+  #endif
+  #undef CYTHON_USE_FREELISTS
+  #define CYTHON_USE_FREELISTS 0
+
+#elif defined(CYTHON_LIMITED_API)
+  // EXPERIMENTAL !!
+  #ifdef Py_LIMITED_API
+    #undef __PYX_LIMITED_VERSION_HEX
+    #define __PYX_LIMITED_VERSION_HEX Py_LIMITED_API
+  #endif
+  #define CYTHON_COMPILING_IN_PYPY 0
+  #define CYTHON_COMPILING_IN_CPYTHON 0
+  #define CYTHON_COMPILING_IN_LIMITED_API 1
+  #define CYTHON_COMPILING_IN_GRAAL 0
+  #define CYTHON_COMPILING_IN_NOGIL 0
+
+  // CYTHON_CLINE_IN_TRACEBACK is currently disabled for the Limited API
+  #undef CYTHON_CLINE_IN_TRACEBACK
+  #define CYTHON_CLINE_IN_TRACEBACK 0
+
+  #undef CYTHON_USE_TYPE_SLOTS
+  #define CYTHON_USE_TYPE_SLOTS 0
+  #undef CYTHON_USE_TYPE_SPECS
+  #define CYTHON_USE_TYPE_SPECS 1
+  #undef CYTHON_USE_PYTYPE_LOOKUP
+  #define CYTHON_USE_PYTYPE_LOOKUP 0
+  #undef CYTHON_USE_ASYNC_SLOTS
+  #define CYTHON_USE_ASYNC_SLOTS 0
+  #undef CYTHON_USE_PYLIST_INTERNALS
+  #define CYTHON_USE_PYLIST_INTERNALS 0
+  #undef CYTHON_USE_UNICODE_INTERNALS
+  #define CYTHON_USE_UNICODE_INTERNALS 0
+  #ifndef CYTHON_USE_UNICODE_WRITER
+    #define CYTHON_USE_UNICODE_WRITER 0
+  #endif
+  #undef CYTHON_USE_PYLONG_INTERNALS
+  #define CYTHON_USE_PYLONG_INTERNALS 0
+  #ifndef CYTHON_AVOID_BORROWED_REFS
+    #define CYTHON_AVOID_BORROWED_REFS 0
+  #endif
+  #undef CYTHON_ASSUME_SAFE_MACROS
+  #define CYTHON_ASSUME_SAFE_MACROS 0
+  #undef CYTHON_UNPACK_METHODS
+  #define CYTHON_UNPACK_METHODS 0
+  #undef CYTHON_FAST_THREAD_STATE
+  #define CYTHON_FAST_THREAD_STATE 0
+  #undef CYTHON_FAST_GIL
+  #define CYTHON_FAST_GIL 0
+  #undef CYTHON_METH_FASTCALL
+  #define CYTHON_METH_FASTCALL 0
+  #undef CYTHON_FAST_PYCALL
+  #define CYTHON_FAST_PYCALL 0
+  #ifndef CYTHON_PEP487_INIT_SUBCLASS
+    #define CYTHON_PEP487_INIT_SUBCLASS 1
+  #endif
+  #undef CYTHON_PEP489_MULTI_PHASE_INIT
+  #define CYTHON_PEP489_MULTI_PHASE_INIT 0
+  #undef CYTHON_USE_MODULE_STATE
+  #define CYTHON_USE_MODULE_STATE 1
+  #ifndef CYTHON_USE_TP_FINALIZE
+    // PyObject_CallFinalizerFromDealloc is missing and not easily replaced
+    #define CYTHON_USE_TP_FINALIZE 0
+  #endif
+  #undef CYTHON_USE_DICT_VERSIONS
+  #define CYTHON_USE_DICT_VERSIONS 0
+  #undef CYTHON_USE_EXC_INFO_STACK
+  #define CYTHON_USE_EXC_INFO_STACK 0
+  #ifndef CYTHON_UPDATE_DESCRIPTOR_DOC
+    #define CYTHON_UPDATE_DESCRIPTOR_DOC 0
+  #endif
+  #undef CYTHON_USE_FREELISTS
+  #define CYTHON_USE_FREELISTS 0
+
+#elif defined(Py_GIL_DISABLED) || defined(Py_NOGIL)
+  #define CYTHON_COMPILING_IN_PYPY 0
+  #define CYTHON_COMPILING_IN_CPYTHON 0
+  #define CYTHON_COMPILING_IN_LIMITED_API 0
+  #define CYTHON_COMPILING_IN_GRAAL 0
+  #define CYTHON_COMPILING_IN_NOGIL 1
+
+  #ifndef CYTHON_USE_TYPE_SLOTS
+    #define CYTHON_USE_TYPE_SLOTS 1
+  #endif
+  #ifndef CYTHON_USE_TYPE_SPECS
+    #define CYTHON_USE_TYPE_SPECS 0
+  #endif
+  #undef CYTHON_USE_PYTYPE_LOOKUP
+  #define CYTHON_USE_PYTYPE_LOOKUP 0
+  #ifndef CYTHON_USE_ASYNC_SLOTS
+    #define CYTHON_USE_ASYNC_SLOTS 1
+  #endif
+  #ifndef CYTHON_USE_PYLONG_INTERNALS
+    #define CYTHON_USE_PYLONG_INTERNALS 0
+  #endif
+  #undef CYTHON_USE_PYLIST_INTERNALS
+  #define CYTHON_USE_PYLIST_INTERNALS 0
+  #ifndef CYTHON_USE_UNICODE_INTERNALS
+    #define CYTHON_USE_UNICODE_INTERNALS 1
+  #endif
+  #undef CYTHON_USE_UNICODE_WRITER
+  #define CYTHON_USE_UNICODE_WRITER 0
+  #ifndef CYTHON_AVOID_BORROWED_REFS
+    #define CYTHON_AVOID_BORROWED_REFS 0
+  #endif
+  #ifndef CYTHON_ASSUME_SAFE_MACROS
+    #define CYTHON_ASSUME_SAFE_MACROS 1
+  #endif
+  #ifndef CYTHON_UNPACK_METHODS
+    #define CYTHON_UNPACK_METHODS 1
+  #endif
+  #undef CYTHON_FAST_THREAD_STATE
+  #define CYTHON_FAST_THREAD_STATE 0
+  #undef CYTHON_FAST_GIL
+  #define CYTHON_FAST_GIL 0
+  #ifndef CYTHON_METH_FASTCALL
+    #define CYTHON_METH_FASTCALL 1
+  #endif
+  #undef CYTHON_FAST_PYCALL
+  #define CYTHON_FAST_PYCALL 0
+  #ifndef CYTHON_PEP487_INIT_SUBCLASS
+    #define CYTHON_PEP487_INIT_SUBCLASS 1
+  #endif
+  #ifndef CYTHON_PEP489_MULTI_PHASE_INIT
+    #define CYTHON_PEP489_MULTI_PHASE_INIT 1
+  #endif
+  #ifndef CYTHON_USE_MODULE_STATE
+    #define CYTHON_USE_MODULE_STATE 0
+  #endif
+  #ifndef CYTHON_USE_TP_FINALIZE
+    #define CYTHON_USE_TP_FINALIZE 1
+  #endif
+  #undef CYTHON_USE_DICT_VERSIONS
+  #define CYTHON_USE_DICT_VERSIONS 0
+  #undef CYTHON_USE_EXC_INFO_STACK
+  #define CYTHON_USE_EXC_INFO_STACK 0
+  #ifndef CYTHON_UPDATE_DESCRIPTOR_DOC
+    #define CYTHON_UPDATE_DESCRIPTOR_DOC 1
+  #endif
+  #ifndef CYTHON_USE_FREELISTS
+    // TODO - we could probably enable CYTHON_USE_FREELISTS by default in future since
+    // this is just a variant of cpython now, but we'd need to be very careful to make
+    // them thread safe. Since it will probably work, let the user decide.
+    #define CYTHON_USE_FREELISTS 0
+  #endif
+
+#else
+  #define CYTHON_COMPILING_IN_PYPY 0
+  #define CYTHON_COMPILING_IN_CPYTHON 1
+  #define CYTHON_COMPILING_IN_LIMITED_API 0
+  #define CYTHON_COMPILING_IN_GRAAL 0
+  #define CYTHON_COMPILING_IN_NOGIL 0
+
+  #ifndef CYTHON_USE_TYPE_SLOTS
+    #define CYTHON_USE_TYPE_SLOTS 1
+  #endif
+  #ifndef CYTHON_USE_TYPE_SPECS
+    #define CYTHON_USE_TYPE_SPECS 0
+  #endif
+  #ifndef CYTHON_USE_PYTYPE_LOOKUP
+    #define CYTHON_USE_PYTYPE_LOOKUP 1
+  #endif
+  #if PY_MAJOR_VERSION < 3
+    #undef CYTHON_USE_ASYNC_SLOTS
+    #define CYTHON_USE_ASYNC_SLOTS 0
+  #elif !defined(CYTHON_USE_ASYNC_SLOTS)
+    #define CYTHON_USE_ASYNC_SLOTS 1
+  #endif
+  #ifndef CYTHON_USE_PYLONG_INTERNALS
+    #define CYTHON_USE_PYLONG_INTERNALS 1
+  #endif
+  #ifndef CYTHON_USE_PYLIST_INTERNALS
+    #define CYTHON_USE_PYLIST_INTERNALS 1
+  #endif
+  #ifndef CYTHON_USE_UNICODE_INTERNALS
+    #define CYTHON_USE_UNICODE_INTERNALS 1
+  #endif
+  #if PY_VERSION_HEX < 0x030300F0 || PY_VERSION_HEX >= 0x030B00A2
+    // Python 3.11a2 hid _PyLong_FormatAdvancedWriter and _PyFloat_FormatAdvancedWriter
+    // therefore disable unicode writer until a better alternative appears
+    #undef CYTHON_USE_UNICODE_WRITER
+    #define CYTHON_USE_UNICODE_WRITER 0
+  #elif !defined(CYTHON_USE_UNICODE_WRITER)
+    #define CYTHON_USE_UNICODE_WRITER 1
+  #endif
+  // CYTHON_AVOID_BORROWED_REFS - Avoid borrowed references and always request owned references directly instead.
+  #ifndef CYTHON_AVOID_BORROWED_REFS
+    #define CYTHON_AVOID_BORROWED_REFS 0
+  #endif
+  // CYTHON_ASSUME_SAFE_MACROS - Assume that macro calls do not fail and do not raise exceptions.
+  #ifndef CYTHON_ASSUME_SAFE_MACROS
+    #define CYTHON_ASSUME_SAFE_MACROS 1
+  #endif
+  #ifndef CYTHON_UNPACK_METHODS
+    #define CYTHON_UNPACK_METHODS 1
+  #endif
+  #ifndef CYTHON_FAST_THREAD_STATE
+    #define CYTHON_FAST_THREAD_STATE 1
+  #endif
+  #ifndef CYTHON_FAST_GIL
+    // Py3<3.5.2 does not support _PyThreadState_UncheckedGet().
+    // FIXME: FastGIL can probably be supported also in CPython 3.12 but needs to be adapted.
+    #define CYTHON_FAST_GIL (PY_MAJOR_VERSION < 3 || PY_VERSION_HEX >= 0x03060000 && PY_VERSION_HEX < 0x030C00A6)
+  #endif
+  #ifndef CYTHON_METH_FASTCALL
+    // CPython 3.6 introduced METH_FASTCALL but with slightly different
+    // semantics. It became stable starting from CPython 3.7.
+    #define CYTHON_METH_FASTCALL (PY_VERSION_HEX >= 0x030700A1)
+  #endif
+  #ifndef CYTHON_FAST_PYCALL
+    #define CYTHON_FAST_PYCALL 1
+  #endif
+  #ifndef CYTHON_PEP487_INIT_SUBCLASS
+    #define CYTHON_PEP487_INIT_SUBCLASS 1
+  #endif
+  #if PY_VERSION_HEX < 0x03050000
+    #undef CYTHON_PEP489_MULTI_PHASE_INIT
+    #define CYTHON_PEP489_MULTI_PHASE_INIT 0
+  #elif !defined(CYTHON_PEP489_MULTI_PHASE_INIT)
+    #define CYTHON_PEP489_MULTI_PHASE_INIT 1
+  #endif
+  // CYTHON_USE_MODULE_STATE - Use a module state/globals struct tied to the module object.
+  #ifndef CYTHON_USE_MODULE_STATE
+    // EXPERIMENTAL !!
+    #define CYTHON_USE_MODULE_STATE 0
+  #endif
+  #if PY_VERSION_HEX < 0x030400a1
+    #undef CYTHON_USE_TP_FINALIZE
+    #define CYTHON_USE_TP_FINALIZE 0
+  #elif !defined(CYTHON_USE_TP_FINALIZE)
+    #define CYTHON_USE_TP_FINALIZE 1
+  #endif
+  #if PY_VERSION_HEX < 0x030600B1
+    #undef CYTHON_USE_DICT_VERSIONS
+    #define CYTHON_USE_DICT_VERSIONS 0
+  #elif !defined(CYTHON_USE_DICT_VERSIONS)
+    // Python 3.12a5 deprecated "ma_version_tag"
+    #define CYTHON_USE_DICT_VERSIONS  (PY_VERSION_HEX < 0x030C00A5)
+  #endif
+  #if PY_VERSION_HEX < 0x030700A3
+    #undef CYTHON_USE_EXC_INFO_STACK
+    #define CYTHON_USE_EXC_INFO_STACK 0
+  #elif !defined(CYTHON_USE_EXC_INFO_STACK)
+    #define CYTHON_USE_EXC_INFO_STACK 1
+  #endif
+  #ifndef CYTHON_UPDATE_DESCRIPTOR_DOC
+    #define CYTHON_UPDATE_DESCRIPTOR_DOC 1
+  #endif
+  #ifndef CYTHON_USE_FREELISTS
+    #define CYTHON_USE_FREELISTS 1
+  #endif
+#endif
+
+#if !defined(CYTHON_FAST_PYCCALL)
+#define CYTHON_FAST_PYCCALL  (CYTHON_FAST_PYCALL && PY_VERSION_HEX >= 0x030600B1)
+#endif
+
+#if !defined(CYTHON_VECTORCALL)
+#define CYTHON_VECTORCALL  (CYTHON_FAST_PYCCALL && PY_VERSION_HEX >= 0x030800B1)
+#endif
+
+/* Whether to use METH_FASTCALL with a fake backported implementation of vectorcall */
+#define CYTHON_BACKPORT_VECTORCALL (CYTHON_METH_FASTCALL && PY_VERSION_HEX < 0x030800B1)
+
+#if CYTHON_USE_PYLONG_INTERNALS
+  #if PY_MAJOR_VERSION < 3
+    #include "longintrepr.h"
+  #endif
+  /* These short defines can easily conflict with other code */
+  #undef SHIFT
+  #undef BASE
+  #undef MASK
+  /* Compile-time sanity check that these are indeed equal.  Github issue #2670. */
+  #ifdef SIZEOF_VOID_P
+    enum { __pyx_check_sizeof_voidp = 1 / (int)(SIZEOF_VOID_P == sizeof(void*)) };
+  #endif
+#endif
+
+#ifndef __has_attribute
+  #define __has_attribute(x) 0
+#endif
+
+#ifndef __has_cpp_attribute
+  #define __has_cpp_attribute(x) 0
+#endif
+
+// restrict
+#ifndef CYTHON_RESTRICT
+  #if defined(__GNUC__)
+    #define CYTHON_RESTRICT __restrict__
+  #elif defined(_MSC_VER) && _MSC_VER >= 1400
+    #define CYTHON_RESTRICT __restrict
+  #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+    #define CYTHON_RESTRICT restrict
+  #else
+    #define CYTHON_RESTRICT
+  #endif
+#endif
+
+// unused attribute
+#ifndef CYTHON_UNUSED
+  #if defined(__cplusplus)
+    /* for clang __has_cpp_attribute(maybe_unused) is true even before C++17
+     * but leads to warnings with -pedantic, since it is a C++17 feature */
+    #if ((defined(_MSVC_LANG) && _MSVC_LANG >= 201703L) || __cplusplus >= 201703L)
+      #if __has_cpp_attribute(maybe_unused)
+        #define CYTHON_UNUSED [[maybe_unused]]
+      #endif
+    #endif
+  #endif
+#endif
+#ifndef CYTHON_UNUSED
+# if defined(__GNUC__)
+#   if !(defined(__cplusplus)) || (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+#     define CYTHON_UNUSED __attribute__ ((__unused__))
+#   else
+#     define CYTHON_UNUSED
+#   endif
+# elif defined(__ICC) || (defined(__INTEL_COMPILER) && !defined(_MSC_VER))
+#   define CYTHON_UNUSED __attribute__ ((__unused__))
+# else
+#   define CYTHON_UNUSED
+# endif
+#endif
+
+#ifndef CYTHON_UNUSED_VAR
+#  if defined(__cplusplus)
+     template<class T> void CYTHON_UNUSED_VAR( const T& ) { }
+#  else
+#    define CYTHON_UNUSED_VAR(x) (void)(x)
+#  endif
+#endif
+
+#ifndef CYTHON_MAYBE_UNUSED_VAR
+  #define CYTHON_MAYBE_UNUSED_VAR(x) CYTHON_UNUSED_VAR(x)
+#endif
+
+#ifndef CYTHON_NCP_UNUSED
+# if CYTHON_COMPILING_IN_CPYTHON
+#  define CYTHON_NCP_UNUSED
+# else
+#  define CYTHON_NCP_UNUSED CYTHON_UNUSED
+# endif
+#endif
+
+#ifndef CYTHON_USE_CPP_STD_MOVE
+  // msvc doesn't set __cplusplus to a useful value
+  #if defined(__cplusplus) && ( \
+    __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1600))
+    #define CYTHON_USE_CPP_STD_MOVE 1
+  #else
+    #define CYTHON_USE_CPP_STD_MOVE 0
+  #endif
+#endif
+
+#define __Pyx_void_to_None(void_result) ((void)(void_result), Py_INCREF(Py_None), Py_None)
+
+#ifdef _MSC_VER
+    #ifndef _MSC_STDINT_H_
+        #if _MSC_VER < 1300
+            typedef unsigned char     uint8_t;
+            typedef unsigned short    uint16_t;
+            typedef unsigned int      uint32_t;
+        #else
+            typedef unsigned __int8   uint8_t;
+            typedef unsigned __int16  uint16_t;
+            typedef unsigned __int32  uint32_t;
+        #endif
+    #endif
+    #if _MSC_VER < 1300
+        #ifdef _WIN64
+            typedef unsigned long long  __pyx_uintptr_t;
+        #else
+            typedef unsigned int        __pyx_uintptr_t;
+        #endif
+    #else
+        #ifdef _WIN64
+            typedef unsigned __int64    __pyx_uintptr_t;
+        #else
+            typedef unsigned __int32    __pyx_uintptr_t;
+        #endif
+    #endif
+#else
+    #include <stdint.h>
+    typedef uintptr_t  __pyx_uintptr_t;
+#endif
+
+
+#ifndef CYTHON_FALLTHROUGH
+  #if defined(__cplusplus)
+    /* for clang __has_cpp_attribute(fallthrough) is true even before C++17
+     * but leads to warnings with -pedantic, since it is a C++17 feature */
+    #if ((defined(_MSVC_LANG) && _MSVC_LANG >= 201703L) || __cplusplus >= 201703L)
+      #if __has_cpp_attribute(fallthrough)
+        #define CYTHON_FALLTHROUGH [[fallthrough]]
+      #endif
+    #endif
+
+    #ifndef CYTHON_FALLTHROUGH
+      #if __has_cpp_attribute(clang::fallthrough)
+        #define CYTHON_FALLTHROUGH [[clang::fallthrough]]
+      #elif __has_cpp_attribute(gnu::fallthrough)
+        #define CYTHON_FALLTHROUGH [[gnu::fallthrough]]
+      #endif
+    #endif
+  #endif
+
+  #ifndef CYTHON_FALLTHROUGH
+    #if __has_attribute(fallthrough)
+      #define CYTHON_FALLTHROUGH __attribute__((fallthrough))
+    #else
+      #define CYTHON_FALLTHROUGH
+    #endif
+  #endif
+
+  #if defined(__clang__) && defined(__apple_build_version__)
+    #if __apple_build_version__ < 7000000 /* Xcode < 7.0 */
+      #undef  CYTHON_FALLTHROUGH
+      #define CYTHON_FALLTHROUGH
+    #endif
+  #endif
+#endif
+
+#ifdef __cplusplus
+  template <typename T>
+  struct __PYX_IS_UNSIGNED_IMPL {static const bool value = T(0) < T(-1);};
+  #define __PYX_IS_UNSIGNED(type) (__PYX_IS_UNSIGNED_IMPL<type>::value)
+#else
+  #define __PYX_IS_UNSIGNED(type) (((type)-1) > 0)
+#endif
+
+#if CYTHON_COMPILING_IN_PYPY == 1
+  #define __PYX_NEED_TP_PRINT_SLOT  (PY_VERSION_HEX >= 0x030800b4 && PY_VERSION_HEX < 0x030A0000)
+#else
+  #define __PYX_NEED_TP_PRINT_SLOT  (PY_VERSION_HEX >= 0x030800b4 && PY_VERSION_HEX < 0x03090000)
+#endif
+// reinterpret
+
+// TODO: refactor existing code to use those macros
+#define __PYX_REINTERPRET_FUNCION(func_pointer, other_pointer) ((func_pointer)(void(*)(void))(other_pointer))
+// #define __PYX_REINTERPRET_POINTER(pointer_type, pointer) ((pointer_type)(void *)(pointer))
+// #define __PYX_RUNTIME_REINTERPRET(type, var) (*(type *)(&var))
+
+
+/////////////// CInitCode ///////////////
+
+// inline attribute
+#ifndef CYTHON_INLINE
+  #if defined(__clang__)
+    #define CYTHON_INLINE __inline__ __attribute__ ((__unused__))
+  #elif defined(__GNUC__)
+    #define CYTHON_INLINE __inline__
+  #elif defined(_MSC_VER)
+    #define CYTHON_INLINE __inline
+  #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+    #define CYTHON_INLINE inline
+  #else
+    #define CYTHON_INLINE
+  #endif
+#endif
+
+
+/////////////// CppInitCode ///////////////
+
+#ifndef __cplusplus
+  #error "Cython files generated with the C++ option must be compiled with a C++ compiler."
+#endif
+
+// inline attribute
+#ifndef CYTHON_INLINE
+  #if defined(__clang__)
+    #define CYTHON_INLINE __inline__ __attribute__ ((__unused__))
+  #else
+    #define CYTHON_INLINE inline
+  #endif
+#endif
+
+// Work around clang bug https://stackoverflow.com/questions/21847816/c-invoke-nested-template-class-destructor
+template<typename T>
+void __Pyx_call_destructor(T& x) {
+    x.~T();
+}
+
+// Used for temporary variables of "reference" type.
+template<typename T>
+class __Pyx_FakeReference {
+  public:
+    __Pyx_FakeReference() : ptr(NULL) { }
+    // __Pyx_FakeReference(T& ref) : ptr(&ref) { }
+    // Const version needed as Cython doesn't know about const overloads (e.g. for stl containers).
+    __Pyx_FakeReference(const T& ref) : ptr(const_cast<T*>(&ref)) { }
+    T *operator->() { return ptr; }
+    T *operator&() { return ptr; }
+    operator T&() { return *ptr; }
+    // TODO(robertwb): Delegate all operators (or auto-generate unwrapping code where needed).
+    template<typename U> bool operator ==(const U& other) const { return *ptr == other; }
+    template<typename U> bool operator !=(const U& other) const { return *ptr != other; }
+    template<typename U> bool operator==(const __Pyx_FakeReference<U>& other) const { return *ptr == *other.ptr; }
+    template<typename U> bool operator!=(const __Pyx_FakeReference<U>& other) const { return *ptr != *other.ptr; }
+  private:
+    T *ptr;
+};
+
+
+/////////////// PythonCompatibility ///////////////
+
+#define __PYX_BUILD_PY_SSIZE_T "n"
+#define CYTHON_FORMAT_SSIZE_T "z"
+
+#if PY_MAJOR_VERSION < 3
+  #define __Pyx_BUILTIN_MODULE_NAME "__builtin__"
+  #define __Pyx_DefaultClassType PyClass_Type
+  #define __Pyx_PyCode_New(a, p, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos) \
+          PyCode_New(a+k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
+#else
+  #define __Pyx_BUILTIN_MODULE_NAME "builtins"
+  #define __Pyx_DefaultClassType PyType_Type
+#if CYTHON_COMPILING_IN_LIMITED_API
+    // Note that the limited API doesn't know about PyCodeObject, so the type of this
+    // is PyObject (unlike for the main API)
+    static CYTHON_INLINE PyObject* __Pyx_PyCode_New(int a, int p, int k, int l, int s, int f,
+                                                    PyObject *code, PyObject *c, PyObject* n, PyObject *v,
+                                                    PyObject *fv, PyObject *cell, PyObject* fn,
+                                                    PyObject *name, int fline, PyObject *lnos) {
+        // Backout option for generating a code object.
+        // PyCode_NewEmpty isn't in the limited API. Therefore the two options are
+        //  1. Python call of the code type with a long list of positional args.
+        //  2. Generate a code object by compiling some trivial code, and customize.
+        // We use the second because it's less sensitive to changes in the code type
+        // constructor with version.
+        PyObject *exception_table = NULL;
+        PyObject *types_module=NULL, *code_type=NULL, *result=NULL;
+        #if __PYX_LIMITED_VERSION_HEX < 0x030B0000
+        PyObject *version_info;  /* borrowed */
+        PyObject *py_minor_version = NULL;
+        #endif
+        long minor_version = 0;
+        PyObject *type, *value, *traceback;
+
+        // we must be able to call this while an exception is happening - thus clear then restore the state
+        PyErr_Fetch(&type, &value, &traceback);
+
+        #if __PYX_LIMITED_VERSION_HEX >= 0x030B0000
+        minor_version = 11;
+        // we don't yet need to distinguish between versions > 11
+        // Note that from 3.13, when we do, we can use Py_Version
+        #else
+        if (!(version_info = PySys_GetObject("version_info"))) goto end;
+        if (!(py_minor_version = PySequence_GetItem(version_info, 1))) goto end;
+        minor_version = PyLong_AsLong(py_minor_version);
+        Py_DECREF(py_minor_version);
+        if (minor_version == -1 && PyErr_Occurred()) goto end;
+        #endif
+
+        if (!(types_module = PyImport_ImportModule("types"))) goto end;
+        if (!(code_type = PyObject_GetAttrString(types_module, "CodeType"))) goto end;
+
+        if (minor_version <= 7) {
+            // 3.7:
+            // code(argcount, kwonlyargcount, nlocals, stacksize, flags, codestring,
+            //        constants, names, varnames, filename, name, firstlineno,
+            //        lnotab[, freevars[, cellvars]])
+            (void)p;
+            result = PyObject_CallFunction(code_type, "iiiiiOOOOOOiOO", a, k, l, s, f, code,
+                          c, n, v, fn, name, fline, lnos, fv, cell);
+        } else if (minor_version <= 10) {
+            // 3.8, 3.9, 3.10
+            // code(argcount, posonlyargcount, kwonlyargcount, nlocals, stacksize,
+            //    flags, codestring, constants, names, varnames, filename, name,
+            //    firstlineno, lnotab[, freevars[, cellvars]])
+            // 3.10 switches lnotab for linetable, but is otherwise the same
+            result = PyObject_CallFunction(code_type, "iiiiiiOOOOOOiOO", a,p, k, l, s, f, code,
+                          c, n, v, fn, name, fline, lnos, fv, cell);
+        } else {
+            // 3.11, 3.12
+            // code(argcount, posonlyargcount, kwonlyargcount, nlocals, stacksize,
+            //    flags, codestring, constants, names, varnames, filename, name,
+            //    qualname, firstlineno, linetable, exceptiontable, freevars=(), cellvars=(), /)
+            // We use name and qualname for simplicity
+            if (!(exception_table = PyBytes_FromStringAndSize(NULL, 0))) goto end;
+            result = PyObject_CallFunction(code_type, "iiiiiiOOOOOOOiOO", a,p, k, l, s, f, code,
+                          c, n, v, fn, name, name, fline, lnos, exception_table, fv, cell);
+        }
+
+    end:
+        Py_XDECREF(code_type);
+        Py_XDECREF(exception_table);
+        Py_XDECREF(types_module);
+        if (type) {
+            PyErr_Restore(type, value, traceback);
+        }
+        return result;
+    }
+
+    // Cython uses these constants but they are not available in the limited API.
+    // (it'd be nice if there was a more robust way of looking these up)
+    #ifndef CO_OPTIMIZED
+    #define CO_OPTIMIZED 0x0001
+    #endif
+    #ifndef CO_NEWLOCALS
+    #define CO_NEWLOCALS 0x0002
+    #endif
+    #ifndef CO_VARARGS
+    #define CO_VARARGS 0x0004
+    #endif
+    #ifndef CO_VARKEYWORDS
+    #define CO_VARKEYWORDS 0x0008
+    #endif
+    #ifndef CO_ASYNC_GENERATOR
+    #define CO_ASYNC_GENERATOR 0x0200
+    #endif
+    #ifndef CO_GENERATOR
+    #define CO_GENERATOR 0x0020
+    #endif
+    #ifndef CO_COROUTINE
+    #define CO_COROUTINE 0x0080
+    #endif
+#elif PY_VERSION_HEX >= 0x030B0000
+  static CYTHON_INLINE PyCodeObject* __Pyx_PyCode_New(int a, int p, int k, int l, int s, int f,
+                                                    PyObject *code, PyObject *c, PyObject* n, PyObject *v,
+                                                    PyObject *fv, PyObject *cell, PyObject* fn,
+                                                    PyObject *name, int fline, PyObject *lnos) {
+    // As earlier versions, but
+    //  1. pass an empty bytes string as exception_table
+    //  2. pass name as qualname (TODO this might implementing properly in future)
+    PyCodeObject *result;
+    PyObject *empty_bytes = PyBytes_FromStringAndSize("", 0);  /* we don't have access to __pyx_empty_bytes here */
+    if (!empty_bytes) return NULL;
+    result =
+      #if PY_VERSION_HEX >= 0x030C0000
+        PyUnstable_Code_NewWithPosOnlyArgs
+      #else
+        PyCode_NewWithPosOnlyArgs
+      #endif
+        (a, p, k, l, s, f, code, c, n, v, fv, cell, fn, name, name, fline, lnos, empty_bytes);
+    Py_DECREF(empty_bytes);
+    return result;
+  }
+#elif PY_VERSION_HEX >= 0x030800B2 && !CYTHON_COMPILING_IN_PYPY
+  #define __Pyx_PyCode_New(a, p, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos) \
+          PyCode_NewWithPosOnlyArgs(a, p, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
+#else
+  #define __Pyx_PyCode_New(a, p, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos) \
+          PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
+#endif
+#endif
+
+#if PY_VERSION_HEX >= 0x030900A4 || defined(Py_IS_TYPE)
+  #define __Pyx_IS_TYPE(ob, type) Py_IS_TYPE(ob, type)
+#else
+  #define __Pyx_IS_TYPE(ob, type) (((const PyObject*)ob)->ob_type == (type))
+#endif
+
+#if PY_VERSION_HEX >= 0x030A00B1 || defined(Py_Is)
+  #define __Pyx_Py_Is(x, y)  Py_Is(x, y)
+#else
+  #define __Pyx_Py_Is(x, y) ((x) == (y))
+#endif
+#if PY_VERSION_HEX >= 0x030A00B1 || defined(Py_IsNone)
+  #define __Pyx_Py_IsNone(ob) Py_IsNone(ob)
+#else
+  #define __Pyx_Py_IsNone(ob) __Pyx_Py_Is((ob), Py_None)
+#endif
+#if PY_VERSION_HEX >= 0x030A00B1 || defined(Py_IsTrue)
+  #define __Pyx_Py_IsTrue(ob) Py_IsTrue(ob)
+#else
+  #define __Pyx_Py_IsTrue(ob) __Pyx_Py_Is((ob), Py_True)
+#endif
+#if PY_VERSION_HEX >= 0x030A00B1 || defined(Py_IsFalse)
+  #define __Pyx_Py_IsFalse(ob) Py_IsFalse(ob)
+#else
+  #define __Pyx_Py_IsFalse(ob) __Pyx_Py_Is((ob), Py_False)
+#endif
+#define __Pyx_NoneAsNull(obj)  (__Pyx_Py_IsNone(obj) ? NULL : (obj))
+
+#if PY_VERSION_HEX >= 0x030900F0 && !CYTHON_COMPILING_IN_PYPY
+  #define __Pyx_PyObject_GC_IsFinalized(o) PyObject_GC_IsFinalized(o)
+#else
+  #define __Pyx_PyObject_GC_IsFinalized(o) _PyGC_FINALIZED(o)
+#endif
+
+#ifndef CO_COROUTINE
+  #define CO_COROUTINE 0x80
+#endif
+#ifndef CO_ASYNC_GENERATOR
+  #define CO_ASYNC_GENERATOR 0x200
+#endif
+
+#ifndef Py_TPFLAGS_CHECKTYPES
+  #define Py_TPFLAGS_CHECKTYPES 0
+#endif
+#ifndef Py_TPFLAGS_HAVE_INDEX
+  #define Py_TPFLAGS_HAVE_INDEX 0
+#endif
+#ifndef Py_TPFLAGS_HAVE_NEWBUFFER
+  #define Py_TPFLAGS_HAVE_NEWBUFFER 0
+#endif
+#ifndef Py_TPFLAGS_HAVE_FINALIZE
+  #define Py_TPFLAGS_HAVE_FINALIZE 0
+#endif
+#ifndef Py_TPFLAGS_SEQUENCE
+  #define Py_TPFLAGS_SEQUENCE 0
+#endif
+#ifndef Py_TPFLAGS_MAPPING
+  #define Py_TPFLAGS_MAPPING 0
+#endif
+
+#ifndef METH_STACKLESS
+  // already defined for Stackless Python (all versions) and C-Python >= 3.7
+  // value if defined: Stackless Python < 3.6: 0x80 else 0x100
+  #define METH_STACKLESS 0
+#endif
+#if PY_VERSION_HEX <= 0x030700A3 || !defined(METH_FASTCALL)
+  // new in CPython 3.6, but changed in 3.7 - see
+  // positional-only parameters:
+  //   https://bugs.python.org/issue29464
+  // const args:
+  //   https://bugs.python.org/issue32240
+  #ifndef METH_FASTCALL
+     #define METH_FASTCALL 0x80
+  #endif
+  typedef PyObject *(*__Pyx_PyCFunctionFast) (PyObject *self, PyObject *const *args, Py_ssize_t nargs);
+  // new in CPython 3.7, used to be old signature of _PyCFunctionFast() in 3.6
+  typedef PyObject *(*__Pyx_PyCFunctionFastWithKeywords) (PyObject *self, PyObject *const *args,
+                                                          Py_ssize_t nargs, PyObject *kwnames);
+#else
+  #if PY_VERSION_HEX >= 0x030d00A4
+  #  define __Pyx_PyCFunctionFast PyCFunctionFast
+  #  define __Pyx_PyCFunctionFastWithKeywords PyCFunctionFastWithKeywords
+  #else
+  #  define __Pyx_PyCFunctionFast _PyCFunctionFast
+  #  define __Pyx_PyCFunctionFastWithKeywords _PyCFunctionFastWithKeywords
+  #endif
+#endif
+
+#if CYTHON_METH_FASTCALL
+  #define __Pyx_METH_FASTCALL METH_FASTCALL
+  #define __Pyx_PyCFunction_FastCall __Pyx_PyCFunctionFast
+  #define __Pyx_PyCFunction_FastCallWithKeywords __Pyx_PyCFunctionFastWithKeywords
+#else
+  #define __Pyx_METH_FASTCALL METH_VARARGS
+  #define __Pyx_PyCFunction_FastCall PyCFunction
+  #define __Pyx_PyCFunction_FastCallWithKeywords PyCFunctionWithKeywords
+#endif
+
+#if CYTHON_VECTORCALL
+  #define __pyx_vectorcallfunc vectorcallfunc
+  #define __Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET  PY_VECTORCALL_ARGUMENTS_OFFSET
+  #define __Pyx_PyVectorcall_NARGS(n)  PyVectorcall_NARGS((size_t)(n))
+#elif CYTHON_BACKPORT_VECTORCALL
+  typedef PyObject *(*__pyx_vectorcallfunc)(PyObject *callable, PyObject *const *args,
+                                            size_t nargsf, PyObject *kwnames);
+  #define __Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET  ((size_t)1 << (8 * sizeof(size_t) - 1))
+  #define __Pyx_PyVectorcall_NARGS(n)  ((Py_ssize_t)(((size_t)(n)) & ~__Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET))
+#else
+  #define __Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET  0
+  #define __Pyx_PyVectorcall_NARGS(n)  ((Py_ssize_t)(n))
+#endif
+
+// These PyCFunction related macros get redefined in CythonFunction.c.
+// We need our own copies because the inline functions in CPython have a type-check assert
+// that breaks with a CyFunction in debug mode.
+#if PY_MAJOR_VERSION >= 0x030900B1
+#define __Pyx_PyCFunction_CheckExact(func)  PyCFunction_CheckExact(func)
+#else
+#define __Pyx_PyCFunction_CheckExact(func)  PyCFunction_Check(func)
+#endif
+#define __Pyx_CyOrPyCFunction_Check(func)  PyCFunction_Check(func)
+
+#if CYTHON_COMPILING_IN_CPYTHON
+#define __Pyx_CyOrPyCFunction_GET_FUNCTION(func)  (((PyCFunctionObject*)(func))->m_ml->ml_meth)
+#elif !CYTHON_COMPILING_IN_LIMITED_API
+// It's probably easier for non-CPythons to support PyCFunction_GET_FUNCTION() than the object struct layout.
+#define __Pyx_CyOrPyCFunction_GET_FUNCTION(func)  PyCFunction_GET_FUNCTION(func)
+// Unused in CYTHON_COMPILING_IN_LIMITED_API.
+#endif
+#if CYTHON_COMPILING_IN_CPYTHON
+#define __Pyx_CyOrPyCFunction_GET_FLAGS(func)  (((PyCFunctionObject*)(func))->m_ml->ml_flags)
+static CYTHON_INLINE PyObject* __Pyx_CyOrPyCFunction_GET_SELF(PyObject *func) {
+    return (__Pyx_CyOrPyCFunction_GET_FLAGS(func) & METH_STATIC) ? NULL : ((PyCFunctionObject*)func)->m_self;
+}
+// Only used if CYTHON_COMPILING_IN_CPYTHON.
+#endif
+static CYTHON_INLINE int __Pyx__IsSameCFunction(PyObject *func, void *cfunc) {
+#if CYTHON_COMPILING_IN_LIMITED_API
+    return PyCFunction_Check(func) && PyCFunction_GetFunction(func) == (PyCFunction) cfunc;
+#else
+    return PyCFunction_Check(func) && PyCFunction_GET_FUNCTION(func) == (PyCFunction) cfunc;
+#endif
+}
+#define __Pyx_IsSameCFunction(func, cfunc)   __Pyx__IsSameCFunction(func, cfunc)
+
+// PEP-573: PyCFunction holds reference to defining class (PyCMethodObject)
+#if __PYX_LIMITED_VERSION_HEX < 0x030900B1
+  #define __Pyx_PyType_FromModuleAndSpec(m, s, b)  ((void)m, PyType_FromSpecWithBases(s, b))
+  typedef PyObject *(*__Pyx_PyCMethod)(PyObject *, PyTypeObject *, PyObject *const *, size_t, PyObject *);
+#else
+  #define __Pyx_PyType_FromModuleAndSpec(m, s, b)  PyType_FromModuleAndSpec(m, s, b)
+  #define __Pyx_PyCMethod  PyCMethod
+#endif
+#ifndef METH_METHOD
+  #define METH_METHOD 0x200
+#endif
+
+#if CYTHON_COMPILING_IN_PYPY && !defined(PyObject_Malloc)
+  #define PyObject_Malloc(s)   PyMem_Malloc(s)
+  #define PyObject_Free(p)     PyMem_Free(p)
+  #define PyObject_Realloc(p)  PyMem_Realloc(p)
+#endif
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+  #define __Pyx_PyCode_HasFreeVars(co)  (PyCode_GetNumFree(co) > 0)
+  #define __Pyx_PyFrame_SetLineNumber(frame, lineno)
+#else
+  #define __Pyx_PyCode_HasFreeVars(co)  (PyCode_GetNumFree(co) > 0)
+  #define __Pyx_PyFrame_SetLineNumber(frame, lineno)  (frame)->f_lineno = (lineno)
+#endif
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+  #define __Pyx_PyThreadState_Current PyThreadState_Get()
+#elif !CYTHON_FAST_THREAD_STATE
+  #define __Pyx_PyThreadState_Current PyThreadState_GET()
+#elif PY_VERSION_HEX >= 0x030d00A1
+  //#elif PY_VERSION_HEX >= 0x03050200
+  // Actually added in 3.5.2, but compiling against that does not guarantee that we get imported there.
+  #define __Pyx_PyThreadState_Current PyThreadState_GetUnchecked()
+#elif PY_VERSION_HEX >= 0x03060000
+  //#elif PY_VERSION_HEX >= 0x03050200
+  // Actually added in 3.5.2, but compiling against that does not guarantee that we get imported there.
+  #define __Pyx_PyThreadState_Current _PyThreadState_UncheckedGet()
+#elif PY_VERSION_HEX >= 0x03000000
+  #define __Pyx_PyThreadState_Current PyThreadState_GET()
+#else
+  #define __Pyx_PyThreadState_Current _PyThreadState_Current
+#endif
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+static CYTHON_INLINE void *__Pyx_PyModule_GetState(PyObject *op)
+{
+    void *result;
+
+    result = PyModule_GetState(op);
+    if (!result)
+        Py_FatalError("Couldn't find the module state");
+    return result;
+}
+#endif
+
+#define __Pyx_PyObject_GetSlot(obj, name, func_ctype)  __Pyx_PyType_GetSlot(Py_TYPE(obj), name, func_ctype)
+#if CYTHON_COMPILING_IN_LIMITED_API
+  #define __Pyx_PyType_GetSlot(type, name, func_ctype)  ((func_ctype) PyType_GetSlot((type), Py_##name))
+#else
+  #define __Pyx_PyType_GetSlot(type, name, func_ctype)  ((type)->name)
+#endif
+
+// TSS (Thread Specific Storage) API
+#if PY_VERSION_HEX < 0x030700A2 && !defined(PyThread_tss_create) && !defined(Py_tss_NEEDS_INIT)
+#include "pythread.h"
+#define Py_tss_NEEDS_INIT 0
+typedef int Py_tss_t;
+static CYTHON_INLINE int PyThread_tss_create(Py_tss_t *key) {
+  *key = PyThread_create_key();
+  return 0; /* PyThread_create_key reports success always */
+}
+static CYTHON_INLINE Py_tss_t * PyThread_tss_alloc(void) {
+  Py_tss_t *key = (Py_tss_t *)PyObject_Malloc(sizeof(Py_tss_t));
+  *key = Py_tss_NEEDS_INIT;
+  return key;
+}
+static CYTHON_INLINE void PyThread_tss_free(Py_tss_t *key) {
+  PyObject_Free(key);
+}
+static CYTHON_INLINE int PyThread_tss_is_created(Py_tss_t *key) {
+  return *key != Py_tss_NEEDS_INIT;
+}
+static CYTHON_INLINE void PyThread_tss_delete(Py_tss_t *key) {
+  PyThread_delete_key(*key);
+  *key = Py_tss_NEEDS_INIT;
+}
+static CYTHON_INLINE int PyThread_tss_set(Py_tss_t *key, void *value) {
+  return PyThread_set_key_value(*key, value);
+}
+static CYTHON_INLINE void * PyThread_tss_get(Py_tss_t *key) {
+  return PyThread_get_key_value(*key);
+}
+// PyThread_delete_key_value(key) is equivalent to PyThread_set_key_value(key, NULL)
+// PyThread_ReInitTLS() is a no-op
+#endif /* TSS (Thread Specific Storage) API */
+
+
+#if PY_MAJOR_VERSION < 3
+    #if CYTHON_COMPILING_IN_PYPY
+        #if PYPY_VERSION_NUM < 0x07030600
+            #if defined(__cplusplus) && __cplusplus >= 201402L
+                [[deprecated("`with nogil:` inside a nogil function will not release the GIL in PyPy2 < 7.3.6")]]
+            #elif defined(__GNUC__) || defined(__clang__)
+                __attribute__ ((__deprecated__("`with nogil:` inside a nogil function will not release the GIL in PyPy2 < 7.3.6")))
+            #elif defined(_MSC_VER)
+                __declspec(deprecated("`with nogil:` inside a nogil function will not release the GIL in PyPy2 < 7.3.6"))
+            #endif
+            static CYTHON_INLINE int PyGILState_Check(void) {
+                // PyGILState_Check is used to decide whether to release the GIL when we don't
+                // know that we have it. For PyPy2 it isn't possible to check.
+                // Therefore assume that we don't have the GIL (which causes us not to release it,
+                // but is "safe")
+                return 0;
+            }
+        #else  // PYPY_VERSION_NUM < 0x07030600
+            // PyPy2 >= 7.3.6 has PyGILState_Check
+        #endif  // PYPY_VERSION_NUM < 0x07030600
+    #else
+        // https://stackoverflow.com/a/25666624
+        static CYTHON_INLINE int PyGILState_Check(void) {
+            PyThreadState * tstate = _PyThreadState_Current;
+            return tstate && (tstate == PyGILState_GetThisThreadState());
+        }
+    #endif
+#endif
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x030d0000 || defined(_PyDict_NewPresized)
+#define __Pyx_PyDict_NewPresized(n)  ((n <= 8) ? PyDict_New() : _PyDict_NewPresized(n))
+#else
+#define __Pyx_PyDict_NewPresized(n)  PyDict_New()
+#endif
+
+#if PY_MAJOR_VERSION >= 3 || CYTHON_FUTURE_DIVISION
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_TrueDivide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceTrueDivide(x,y)
+#else
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_Divide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceDivide(x,y)
+#endif
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX > 0x030600B4 && PY_VERSION_HEX < 0x030d0000 && CYTHON_USE_UNICODE_INTERNALS
+// _PyDict_GetItem_KnownHash() existed from CPython 3.5 to 3.12, but it was
+// dropping exceptions in 3.5. Since 3.6, exceptions are kept.
+#define __Pyx_PyDict_GetItemStrWithError(dict, name)  _PyDict_GetItem_KnownHash(dict, name, ((PyASCIIObject *) name)->hash)
+static CYTHON_INLINE PyObject * __Pyx_PyDict_GetItemStr(PyObject *dict, PyObject *name) {
+    PyObject *res = __Pyx_PyDict_GetItemStrWithError(dict, name);
+    if (res == NULL) PyErr_Clear();
+    return res;
+}
+#elif PY_MAJOR_VERSION >= 3 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07020000)
+#define __Pyx_PyDict_GetItemStrWithError  PyDict_GetItemWithError
+#define __Pyx_PyDict_GetItemStr           PyDict_GetItem
+#else
+static CYTHON_INLINE PyObject * __Pyx_PyDict_GetItemStrWithError(PyObject *dict, PyObject *name) {
+    // This is tricky - we should return a borrowed reference but not swallow non-KeyError exceptions. 8-|
+    // But: this function is only used in Py2 and older PyPys,
+    // and currently only for argument parsing and other non-correctness-critical lookups
+    // and we know that 'name' is an interned 'str' with pre-calculated hash value (only comparisons can fail),
+    // thus, performance matters more than correctness here, especially in the "not found" case.
+#if CYTHON_COMPILING_IN_PYPY
+    // So we ignore any exceptions in old PyPys ...
+    return PyDict_GetItem(dict, name);
+#else
+    // and hack together a stripped-down and modified PyDict_GetItem() in CPython 2.
+    PyDictEntry *ep;
+    PyDictObject *mp = (PyDictObject*) dict;
+    long hash = ((PyStringObject *) name)->ob_shash;
+    assert(hash != -1); /* hash values of interned strings are always initialised */
+    ep = (mp->ma_lookup)(mp, name, hash);
+    if (ep == NULL) {
+        // error occurred
+        return NULL;
+    }
+    // found or not found
+    return ep->me_value;
+#endif
+}
+#define __Pyx_PyDict_GetItemStr           PyDict_GetItem
+#endif
+
+/* Type slots */
+
+#if CYTHON_USE_TYPE_SLOTS
+  #define __Pyx_PyType_GetFlags(tp)   (((PyTypeObject *)tp)->tp_flags)
+  #define __Pyx_PyType_HasFeature(type, feature)  ((__Pyx_PyType_GetFlags(type) & (feature)) != 0)
+  #define __Pyx_PyObject_GetIterNextFunc(obj)  (Py_TYPE(obj)->tp_iternext)
+#else
+  #define __Pyx_PyType_GetFlags(tp)   (PyType_GetFlags((PyTypeObject *)tp))
+  #define __Pyx_PyType_HasFeature(type, feature)  PyType_HasFeature(type, feature)
+  #define __Pyx_PyObject_GetIterNextFunc(obj)  PyIter_Next
+#endif
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+  // Using PyObject_GenericSetAttr to bypass types immutability protection feels
+  // a little hacky, but it does work in the limited API .
+  // (It doesn't work on PyPy but that probably isn't a bug.)
+  #define __Pyx_SetItemOnTypeDict(tp, k, v) PyObject_GenericSetAttr((PyObject*)tp, k, v)
+#else
+  #define __Pyx_SetItemOnTypeDict(tp, k, v) PyDict_SetItem(tp->tp_dict, k, v)
+#endif
+
+#if CYTHON_USE_TYPE_SPECS && PY_VERSION_HEX >= 0x03080000
+// In Py3.8+, instances of heap types need to decref their type on deallocation.
+// https://bugs.python.org/issue35810
+#define __Pyx_PyHeapTypeObject_GC_Del(obj)  { \
+    PyTypeObject *type = Py_TYPE((PyObject*)obj); \
+    assert(__Pyx_PyType_HasFeature(type, Py_TPFLAGS_HEAPTYPE)); \
+    PyObject_GC_Del(obj); \
+    Py_DECREF(type); \
+}
+#else
+#define __Pyx_PyHeapTypeObject_GC_Del(obj)  PyObject_GC_Del(obj)
+#endif
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+  #define CYTHON_PEP393_ENABLED 1
+  #define __Pyx_PyUnicode_READY(op)       (0)
+  #define __Pyx_PyUnicode_GET_LENGTH(u)   PyUnicode_GetLength(u)
+  #define __Pyx_PyUnicode_READ_CHAR(u, i) PyUnicode_ReadChar(u, i)
+  #define __Pyx_PyUnicode_MAX_CHAR_VALUE(u)   ((void)u, 1114111U)
+  #define __Pyx_PyUnicode_KIND(u)         ((void)u, (0))
+  // __Pyx_PyUnicode_DATA() and __Pyx_PyUnicode_READ() must go together, e.g. for iteration.
+  #define __Pyx_PyUnicode_DATA(u)         ((void*)u)
+  #define __Pyx_PyUnicode_READ(k, d, i)   ((void)k, PyUnicode_ReadChar((PyObject*)(d), i))
+  //#define __Pyx_PyUnicode_WRITE(k, d, i, ch)  /* not available */
+  #define __Pyx_PyUnicode_IS_TRUE(u)      (0 != PyUnicode_GetLength(u))
+#elif PY_VERSION_HEX > 0x03030000 && defined(PyUnicode_KIND)
+  /* new Py3.3 unicode type (PEP 393) */
+  #define CYTHON_PEP393_ENABLED 1
+
+  #if PY_VERSION_HEX >= 0x030C0000
+    // Py3.12 / PEP-623 removed wstr type unicode strings and all of the PyUnicode_READY() machinery.
+    #define __Pyx_PyUnicode_READY(op)       (0)
+  #else
+    #define __Pyx_PyUnicode_READY(op)       (likely(PyUnicode_IS_READY(op)) ? \
+                                                0 : _PyUnicode_Ready((PyObject *)(op)))
+  #endif
+
+  #define __Pyx_PyUnicode_GET_LENGTH(u)   PyUnicode_GET_LENGTH(u)
+  #define __Pyx_PyUnicode_READ_CHAR(u, i) PyUnicode_READ_CHAR(u, i)
+  #define __Pyx_PyUnicode_MAX_CHAR_VALUE(u)   PyUnicode_MAX_CHAR_VALUE(u)
+  #define __Pyx_PyUnicode_KIND(u)         ((int)PyUnicode_KIND(u))
+  #define __Pyx_PyUnicode_DATA(u)         PyUnicode_DATA(u)
+  #define __Pyx_PyUnicode_READ(k, d, i)   PyUnicode_READ(k, d, i)
+  #define __Pyx_PyUnicode_WRITE(k, d, i, ch)  PyUnicode_WRITE(k, d, i, (Py_UCS4) ch)
+  #if PY_VERSION_HEX >= 0x030C0000
+    #define __Pyx_PyUnicode_IS_TRUE(u)      (0 != PyUnicode_GET_LENGTH(u))
+  #else
+    #if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x03090000
+    // Avoid calling deprecated C-API functions in Py3.9+ that PEP-623 schedules for removal in Py3.12.
+    // https://www.python.org/dev/peps/pep-0623/
+    #define __Pyx_PyUnicode_IS_TRUE(u)      (0 != (likely(PyUnicode_IS_READY(u)) ? PyUnicode_GET_LENGTH(u) : ((PyCompactUnicodeObject *)(u))->wstr_length))
+    #else
+    #define __Pyx_PyUnicode_IS_TRUE(u)      (0 != (likely(PyUnicode_IS_READY(u)) ? PyUnicode_GET_LENGTH(u) : PyUnicode_GET_SIZE(u)))
+    #endif
+  #endif
+#else
+  #define CYTHON_PEP393_ENABLED 0
+  #define PyUnicode_1BYTE_KIND  1
+  #define PyUnicode_2BYTE_KIND  2
+  #define PyUnicode_4BYTE_KIND  4
+  #define __Pyx_PyUnicode_READY(op)       (0)
+  #define __Pyx_PyUnicode_GET_LENGTH(u)   PyUnicode_GET_SIZE(u)
+  #define __Pyx_PyUnicode_READ_CHAR(u, i) ((Py_UCS4)(PyUnicode_AS_UNICODE(u)[i]))
+  #define __Pyx_PyUnicode_MAX_CHAR_VALUE(u)   ((sizeof(Py_UNICODE) == 2) ? 65535U : 1114111U)
+  #define __Pyx_PyUnicode_KIND(u)         ((int)sizeof(Py_UNICODE))
+  #define __Pyx_PyUnicode_DATA(u)         ((void*)PyUnicode_AS_UNICODE(u))
+  // (void)(k) => avoid unused variable warning due to macro:
+  #define __Pyx_PyUnicode_READ(k, d, i)   ((void)(k), (Py_UCS4)(((Py_UNICODE*)d)[i]))
+  #define __Pyx_PyUnicode_WRITE(k, d, i, ch)  (((void)(k)), ((Py_UNICODE*)d)[i] = (Py_UNICODE) ch)
+  #define __Pyx_PyUnicode_IS_TRUE(u)      (0 != PyUnicode_GET_SIZE(u))
+#endif
+
+#if CYTHON_COMPILING_IN_PYPY
+  #define __Pyx_PyUnicode_Concat(a, b)      PyNumber_Add(a, b)
+  #define __Pyx_PyUnicode_ConcatSafe(a, b)  PyNumber_Add(a, b)
+#else
+  #define __Pyx_PyUnicode_Concat(a, b)      PyUnicode_Concat(a, b)
+  #define __Pyx_PyUnicode_ConcatSafe(a, b)  ((unlikely((a) == Py_None) || unlikely((b) == Py_None)) ? \
+      PyNumber_Add(a, b) : __Pyx_PyUnicode_Concat(a, b))
+#endif
+
+#if CYTHON_COMPILING_IN_PYPY
+  #if !defined(PyUnicode_DecodeUnicodeEscape)
+    #define PyUnicode_DecodeUnicodeEscape(s, size, errors)  PyUnicode_Decode(s, size, "unicode_escape", errors)
+  #endif
+  #if !defined(PyUnicode_Contains) || (PY_MAJOR_VERSION == 2 && PYPY_VERSION_NUM < 0x07030500)
+    #undef PyUnicode_Contains
+    #define PyUnicode_Contains(u, s)  PySequence_Contains(u, s)
+  #endif
+  #if !defined(PyByteArray_Check)
+    #define PyByteArray_Check(obj)  PyObject_TypeCheck(obj, &PyByteArray_Type)
+  #endif
+  #if !defined(PyObject_Format)
+    #define PyObject_Format(obj, fmt)  PyObject_CallMethod(obj, "__format__", "O", fmt)
+  #endif
+#endif
+
+// ("..." % x)  must call PyNumber_Remainder() if x is a string subclass that implements "__rmod__()".
+#define __Pyx_PyString_FormatSafe(a, b)   ((unlikely((a) == Py_None || (PyString_Check(b) && !PyString_CheckExact(b)))) ? PyNumber_Remainder(a, b) : __Pyx_PyString_Format(a, b))
+#define __Pyx_PyUnicode_FormatSafe(a, b)  ((unlikely((a) == Py_None || (PyUnicode_Check(b) && !PyUnicode_CheckExact(b)))) ? PyNumber_Remainder(a, b) : PyUnicode_Format(a, b))
+
+#if PY_MAJOR_VERSION >= 3
+  #define __Pyx_PyString_Format(a, b)  PyUnicode_Format(a, b)
+#else
+  #define __Pyx_PyString_Format(a, b)  PyString_Format(a, b)
+#endif
+
+#if PY_MAJOR_VERSION < 3 && !defined(PyObject_ASCII)
+  #define PyObject_ASCII(o)            PyObject_Repr(o)
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define PyBaseString_Type            PyUnicode_Type
+  #define PyStringObject               PyUnicodeObject
+  #define PyString_Type                PyUnicode_Type
+  #define PyString_Check               PyUnicode_Check
+  #define PyString_CheckExact          PyUnicode_CheckExact
+  // PyPy3 used to define "PyObject_Unicode"
+#ifndef PyObject_Unicode
+  #define PyObject_Unicode             PyObject_Str
+#endif
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define __Pyx_PyBaseString_Check(obj) PyUnicode_Check(obj)
+  #define __Pyx_PyBaseString_CheckExact(obj) PyUnicode_CheckExact(obj)
+#else
+  #define __Pyx_PyBaseString_Check(obj) (PyString_Check(obj) || PyUnicode_Check(obj))
+  #define __Pyx_PyBaseString_CheckExact(obj) (PyString_CheckExact(obj) || PyUnicode_CheckExact(obj))
+#endif
+
+#if CYTHON_COMPILING_IN_CPYTHON
+  #define __Pyx_PySequence_ListKeepNew(obj) \
+    (likely(PyList_CheckExact(obj) && Py_REFCNT(obj) == 1) ? __Pyx_NewRef(obj) : PySequence_List(obj))
+#else
+  #define __Pyx_PySequence_ListKeepNew(obj)  PySequence_List(obj)
+#endif
+
+#ifndef PySet_CheckExact
+  #define PySet_CheckExact(obj)        __Pyx_IS_TYPE(obj, &PySet_Type)
+#endif
+
+#if PY_VERSION_HEX >= 0x030900A4
+  #define __Pyx_SET_REFCNT(obj, refcnt) Py_SET_REFCNT(obj, refcnt)
+  #define __Pyx_SET_SIZE(obj, size) Py_SET_SIZE(obj, size)
+#else
+  #define __Pyx_SET_REFCNT(obj, refcnt) Py_REFCNT(obj) = (refcnt)
+  #define __Pyx_SET_SIZE(obj, size) Py_SIZE(obj) = (size)
+#endif
+
+#if CYTHON_ASSUME_SAFE_MACROS
+  #define __Pyx_PySequence_ITEM(o, i) PySequence_ITEM(o, i)
+  #define __Pyx_PySequence_SIZE(seq)  Py_SIZE(seq)
+  #define __Pyx_PyTuple_SET_ITEM(o, i, v) (PyTuple_SET_ITEM(o, i, v), (0))
+  #define __Pyx_PyList_SET_ITEM(o, i, v) (PyList_SET_ITEM(o, i, v), (0))
+  #define __Pyx_PyTuple_GET_SIZE(o) PyTuple_GET_SIZE(o)
+  #define __Pyx_PyList_GET_SIZE(o) PyList_GET_SIZE(o)
+  #define __Pyx_PySet_GET_SIZE(o) PySet_GET_SIZE(o)
+  #define __Pyx_PyBytes_GET_SIZE(o) PyBytes_GET_SIZE(o)
+  #define __Pyx_PyByteArray_GET_SIZE(o) PyByteArray_GET_SIZE(o)
+#else
+  #define __Pyx_PySequence_ITEM(o, i) PySequence_GetItem(o, i)
+  // NOTE: might fail with exception => check for -1
+  #define __Pyx_PySequence_SIZE(seq)  PySequence_Size(seq)
+  // Note that this doesn't leak a reference to whatever's at o[i]
+  #define __Pyx_PyTuple_SET_ITEM(o, i, v) PyTuple_SetItem(o, i, v)
+  #define __Pyx_PyList_SET_ITEM(o, i, v) PyList_SetItem(o, i, v)
+  #define __Pyx_PyTuple_GET_SIZE(o) PyTuple_Size(o)
+  #define __Pyx_PyList_GET_SIZE(o) PyList_Size(o)
+  #define __Pyx_PySet_GET_SIZE(o) PySet_Size(o)
+  #define __Pyx_PyBytes_GET_SIZE(o) PyBytes_Size(o)
+  #define __Pyx_PyByteArray_GET_SIZE(o) PyByteArray_Size(o)
+#endif
+
+#if __PYX_LIMITED_VERSION_HEX >= 0x030d00A1
+  #define __Pyx_PyImport_AddModuleRef(name) PyImport_AddModuleRef(name)
+#else
+  static CYTHON_INLINE PyObject *__Pyx_PyImport_AddModuleRef(const char *name) {
+      PyObject *module = PyImport_AddModule(name);
+      Py_XINCREF(module);
+      return module;
+  }
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define PyIntObject                  PyLongObject
+  #define PyInt_Type                   PyLong_Type
+  #define PyInt_Check(op)              PyLong_Check(op)
+  #define PyInt_CheckExact(op)         PyLong_CheckExact(op)
+  #define __Pyx_Py3Int_Check(op)       PyLong_Check(op)
+  #define __Pyx_Py3Int_CheckExact(op)  PyLong_CheckExact(op)
+  #define PyInt_FromString             PyLong_FromString
+  #define PyInt_FromUnicode            PyLong_FromUnicode
+  #define PyInt_FromLong               PyLong_FromLong
+  #define PyInt_FromSize_t             PyLong_FromSize_t
+  #define PyInt_FromSsize_t            PyLong_FromSsize_t
+  #define PyInt_AsLong                 PyLong_AsLong
+  #define PyInt_AS_LONG                PyLong_AS_LONG
+  #define PyInt_AsSsize_t              PyLong_AsSsize_t
+  #define PyInt_AsUnsignedLongMask     PyLong_AsUnsignedLongMask
+  #define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
+  #define PyNumber_Int                 PyNumber_Long
+#else
+  #define __Pyx_Py3Int_Check(op)       (PyLong_Check(op) || PyInt_Check(op))
+  #define __Pyx_Py3Int_CheckExact(op)  (PyLong_CheckExact(op) || PyInt_CheckExact(op))
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define PyBoolObject                 PyLongObject
+#endif
+
+#if PY_MAJOR_VERSION >= 3 && CYTHON_COMPILING_IN_PYPY
+  #ifndef PyUnicode_InternFromString
+    #define PyUnicode_InternFromString(s) PyUnicode_FromString(s)
+  #endif
+#endif
+
+#if PY_VERSION_HEX < 0x030200A4
+  typedef long Py_hash_t;
+  #define __Pyx_PyInt_FromHash_t PyInt_FromLong
+  #define __Pyx_PyInt_AsHash_t   __Pyx_PyIndex_AsHash_t
+#else
+  #define __Pyx_PyInt_FromHash_t PyInt_FromSsize_t
+  #define __Pyx_PyInt_AsHash_t   __Pyx_PyIndex_AsSsize_t
+#endif
+
+// backport of PyAsyncMethods from Py3.5 to older Py3.x versions
+// (mis-)using the "tp_reserved" type slot which is re-activated as "tp_as_async" in Py3.5
+#if CYTHON_USE_ASYNC_SLOTS
+  #if PY_VERSION_HEX >= 0x030500B1
+    #define __Pyx_PyAsyncMethodsStruct PyAsyncMethods
+    #define __Pyx_PyType_AsAsync(obj) (Py_TYPE(obj)->tp_as_async)
+  #else
+    #define __Pyx_PyType_AsAsync(obj) ((__Pyx_PyAsyncMethodsStruct*) (Py_TYPE(obj)->tp_reserved))
+  #endif
+#else
+  #define __Pyx_PyType_AsAsync(obj) NULL
+#endif
+#ifndef __Pyx_PyAsyncMethodsStruct
+    typedef struct {
+        unaryfunc am_await;
+        unaryfunc am_aiter;
+        unaryfunc am_anext;
+    } __Pyx_PyAsyncMethodsStruct;
+#endif
+
+
+/////////////// IncludeStructmemberH.proto ///////////////
+
+#include <structmember.h>
+
+
+/////////////// SmallCodeConfig.proto ///////////////
+
+#ifndef CYTHON_SMALL_CODE
+#if defined(__clang__)
+    #define CYTHON_SMALL_CODE
+#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
+    #define CYTHON_SMALL_CODE __attribute__((cold))
+#else
+    #define CYTHON_SMALL_CODE
+#endif
+#endif
+
+
+/////////////// PyModInitFuncType.proto ///////////////
+
+#ifndef CYTHON_NO_PYINIT_EXPORT
+#define __Pyx_PyMODINIT_FUNC PyMODINIT_FUNC
+
+#elif PY_MAJOR_VERSION < 3
+// Py2: define this to void manually because PyMODINIT_FUNC adds __declspec(dllexport) to it's definition.
+#ifdef __cplusplus
+#define __Pyx_PyMODINIT_FUNC extern "C" void
+#else
+#define __Pyx_PyMODINIT_FUNC void
+#endif
+
+#else
+// Py3+: define this to PyObject * manually because PyMODINIT_FUNC adds __declspec(dllexport) to it's definition.
+#ifdef __cplusplus
+#define __Pyx_PyMODINIT_FUNC extern "C" PyObject *
+#else
+#define __Pyx_PyMODINIT_FUNC PyObject *
+#endif
+#endif
+
+
+/////////////// FastTypeChecks.proto ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON
+#define __Pyx_TypeCheck(obj, type) __Pyx_IsSubtype(Py_TYPE(obj), (PyTypeObject *)type)
+#define __Pyx_TypeCheck2(obj, type1, type2) __Pyx_IsAnySubtype2(Py_TYPE(obj), (PyTypeObject *)type1, (PyTypeObject *)type2)
+static CYTHON_INLINE int __Pyx_IsSubtype(PyTypeObject *a, PyTypeObject *b);/*proto*/
+static CYTHON_INLINE int __Pyx_IsAnySubtype2(PyTypeObject *cls, PyTypeObject *a, PyTypeObject *b);/*proto*/
+static CYTHON_INLINE int __Pyx_PyErr_GivenExceptionMatches(PyObject *err, PyObject *type);/*proto*/
+static CYTHON_INLINE int __Pyx_PyErr_GivenExceptionMatches2(PyObject *err, PyObject *type1, PyObject *type2);/*proto*/
+#else
+#define __Pyx_TypeCheck(obj, type) PyObject_TypeCheck(obj, (PyTypeObject *)type)
+#define __Pyx_TypeCheck2(obj, type1, type2) (PyObject_TypeCheck(obj, (PyTypeObject *)type1) || PyObject_TypeCheck(obj, (PyTypeObject *)type2))
+#define __Pyx_PyErr_GivenExceptionMatches(err, type) PyErr_GivenExceptionMatches(err, type)
+#define __Pyx_PyErr_GivenExceptionMatches2(err, type1, type2) (PyErr_GivenExceptionMatches(err, type1) || PyErr_GivenExceptionMatches(err, type2))
+#endif
+#define __Pyx_PyErr_ExceptionMatches2(err1, err2)  __Pyx_PyErr_GivenExceptionMatches2(__Pyx_PyErr_CurrentExceptionType(), err1, err2)
+
+#define __Pyx_PyException_Check(obj) __Pyx_TypeCheck(obj, PyExc_Exception)
+
+/////////////// FastTypeChecks ///////////////
+//@requires: Exceptions.c::PyThreadStateGet
+//@requires: Exceptions.c::PyErrFetchRestore
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static int __Pyx_InBases(PyTypeObject *a, PyTypeObject *b) {
+    while (a) {
+        a = __Pyx_PyType_GetSlot(a, tp_base, PyTypeObject*);
+        if (a == b)
+            return 1;
+    }
+    return b == &PyBaseObject_Type;
+}
+
+static CYTHON_INLINE int __Pyx_IsSubtype(PyTypeObject *a, PyTypeObject *b) {
+    PyObject *mro;
+    if (a == b) return 1;
+    mro = a->tp_mro;
+    if (likely(mro)) {
+        Py_ssize_t i, n;
+        n = PyTuple_GET_SIZE(mro);
+        for (i = 0; i < n; i++) {
+            if (PyTuple_GET_ITEM(mro, i) == (PyObject *)b)
+                return 1;
+        }
+        return 0;
+    }
+    // should only get here for incompletely initialised types, i.e. never under normal usage patterns
+    return __Pyx_InBases(a, b);
+}
+
+static CYTHON_INLINE int __Pyx_IsAnySubtype2(PyTypeObject *cls, PyTypeObject *a, PyTypeObject *b) {
+    PyObject *mro;
+    if (cls == a || cls == b) return 1;
+    mro = cls->tp_mro;
+    if (likely(mro)) {
+        Py_ssize_t i, n;
+        n = PyTuple_GET_SIZE(mro);
+        for (i = 0; i < n; i++) {
+            PyObject *base = PyTuple_GET_ITEM(mro, i);
+            if (base == (PyObject *)a || base == (PyObject *)b)
+                return 1;
+        }
+        return 0;
+    }
+    // should only get here for incompletely initialised types, i.e. never under normal usage patterns
+    return __Pyx_InBases(cls, a) || __Pyx_InBases(cls, b);
+}
+
+
+#if PY_MAJOR_VERSION == 2
+static int __Pyx_inner_PyErr_GivenExceptionMatches2(PyObject *err, PyObject* exc_type1, PyObject* exc_type2) {
+    // PyObject_IsSubclass() can recurse and therefore is not safe
+    PyObject *exception, *value, *tb;
+    int res;
+    __Pyx_PyThreadState_declare
+    __Pyx_PyThreadState_assign
+    __Pyx_ErrFetch(&exception, &value, &tb);
+
+    res = exc_type1 ? PyObject_IsSubclass(err, exc_type1) : 0;
+    // This function must not fail, so print the error here (which also clears it)
+    if (unlikely(res == -1)) {
+        PyErr_WriteUnraisable(err);
+        res = 0;
+    }
+    if (!res) {
+        res = PyObject_IsSubclass(err, exc_type2);
+        // This function must not fail, so print the error here (which also clears it)
+        if (unlikely(res == -1)) {
+            PyErr_WriteUnraisable(err);
+            res = 0;
+        }
+    }
+
+    __Pyx_ErrRestore(exception, value, tb);
+    return res;
+}
+#else
+static CYTHON_INLINE int __Pyx_inner_PyErr_GivenExceptionMatches2(PyObject *err, PyObject* exc_type1, PyObject *exc_type2) {
+    if (exc_type1) {
+        return __Pyx_IsAnySubtype2((PyTypeObject*)err, (PyTypeObject*)exc_type1, (PyTypeObject*)exc_type2);
+    } else {
+        return __Pyx_IsSubtype((PyTypeObject*)err, (PyTypeObject*)exc_type2);
+    }
+}
+#endif
+
+// so far, we only call PyErr_GivenExceptionMatches() with an exception type (not instance) as first argument
+// => optimise for that case
+
+static int __Pyx_PyErr_GivenExceptionMatchesTuple(PyObject *exc_type, PyObject *tuple) {
+    Py_ssize_t i, n;
+    assert(PyExceptionClass_Check(exc_type));
+    n = PyTuple_GET_SIZE(tuple);
+#if PY_MAJOR_VERSION >= 3
+    // the tighter subtype checking in Py3 allows faster out-of-order comparison
+    for (i=0; i<n; i++) {
+        if (exc_type == PyTuple_GET_ITEM(tuple, i)) return 1;
+    }
+#endif
+    for (i=0; i<n; i++) {
+        PyObject *t = PyTuple_GET_ITEM(tuple, i);
+        #if PY_MAJOR_VERSION < 3
+        if (likely(exc_type == t)) return 1;
+        #endif
+        if (likely(PyExceptionClass_Check(t))) {
+            if (__Pyx_inner_PyErr_GivenExceptionMatches2(exc_type, NULL, t)) return 1;
+        } else {
+            // FIXME: Py3: PyErr_SetString(PyExc_TypeError, "catching classes that do not inherit from BaseException is not allowed");
+        }
+    }
+    return 0;
+}
+
+static CYTHON_INLINE int __Pyx_PyErr_GivenExceptionMatches(PyObject *err, PyObject* exc_type) {
+    if (likely(err == exc_type)) return 1;
+    if (likely(PyExceptionClass_Check(err))) {
+        if (likely(PyExceptionClass_Check(exc_type))) {
+            return __Pyx_inner_PyErr_GivenExceptionMatches2(err, NULL, exc_type);
+        } else if (likely(PyTuple_Check(exc_type))) {
+            return __Pyx_PyErr_GivenExceptionMatchesTuple(err, exc_type);
+        } else {
+            // FIXME: Py3: PyErr_SetString(PyExc_TypeError, "catching classes that do not inherit from BaseException is not allowed");
+        }
+    }
+    return PyErr_GivenExceptionMatches(err, exc_type);
+}
+
+static CYTHON_INLINE int __Pyx_PyErr_GivenExceptionMatches2(PyObject *err, PyObject *exc_type1, PyObject *exc_type2) {
+    // Only used internally with known exception types => pure safety check assertions.
+    assert(PyExceptionClass_Check(exc_type1));
+    assert(PyExceptionClass_Check(exc_type2));
+    if (likely(err == exc_type1 || err == exc_type2)) return 1;
+    if (likely(PyExceptionClass_Check(err))) {
+        return __Pyx_inner_PyErr_GivenExceptionMatches2(err, exc_type1, exc_type2);
+    }
+    return (PyErr_GivenExceptionMatches(err, exc_type1) || PyErr_GivenExceptionMatches(err, exc_type2));
+}
+
+#endif
+
+
+/////////////// MathInitCode ///////////////
+
+#if defined(_WIN32) || defined(WIN32) || defined(MS_WINDOWS)
+  #if !defined(_USE_MATH_DEFINES)
+    #define _USE_MATH_DEFINES
+  #endif
+#endif
+#include <math.h>
+
+#ifdef NAN
+#define __PYX_NAN() ((float) NAN)
+#else
+static CYTHON_INLINE float __PYX_NAN() {
+  // Initialize NaN.  The sign is irrelevant, an exponent with all bits 1 and
+  // a nonzero mantissa means NaN.  If the first bit in the mantissa is 1, it is
+  // a quiet NaN.
+  float value;
+  memset(&value, 0xFF, sizeof(value));
+  return value;
+}
+#endif
+
+#if defined(__CYGWIN__) && defined(_LDBL_EQ_DBL)
+#define __Pyx_truncl trunc
+#else
+#define __Pyx_truncl truncl
+#endif
+
+
+/////////////// UtilityFunctionPredeclarations.proto ///////////////
+
+typedef struct {PyObject **p; const char *s; const Py_ssize_t n; const char* encoding;
+                const char is_unicode; const char is_str; const char intern; } __Pyx_StringTabEntry; /*proto*/
+
+/////////////// ForceInitThreads.proto ///////////////
+//@proto_block: utility_code_proto_before_types
+
+#ifndef __PYX_FORCE_INIT_THREADS
+  #define __PYX_FORCE_INIT_THREADS 0
+#endif
+
+/////////////// InitThreads.init ///////////////
+
+#if defined(WITH_THREAD) && PY_VERSION_HEX < 0x030700F0
+PyEval_InitThreads();
+#endif
+
+
+/////////////// ModuleCreationPEP489 ///////////////
+//@substitute: naming
+
+//#if CYTHON_PEP489_MULTI_PHASE_INIT
+static CYTHON_SMALL_CODE int __Pyx_check_single_interpreter(void) {
+    #if PY_VERSION_HEX >= 0x030700A1
+    static PY_INT64_T main_interpreter_id = -1;
+    PY_INT64_T current_id = PyInterpreterState_GetID(PyThreadState_Get()->interp);
+    if (main_interpreter_id == -1) {
+        main_interpreter_id = current_id;
+        return (unlikely(current_id == -1)) ? -1 : 0;
+    } else if (unlikely(main_interpreter_id != current_id))
+
+    #else
+    static PyInterpreterState *main_interpreter = NULL;
+    PyInterpreterState *current_interpreter = PyThreadState_Get()->interp;
+    if (!main_interpreter) {
+        main_interpreter = current_interpreter;
+    } else if (unlikely(main_interpreter != current_interpreter))
+    #endif
+
+    {
+        PyErr_SetString(
+            PyExc_ImportError,
+            "Interpreter change detected - this module can only be loaded into one interpreter per process.");
+        return -1;
+    }
+    return 0;
+}
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+static CYTHON_SMALL_CODE int __Pyx_copy_spec_to_module(PyObject *spec, PyObject *module, const char* from_name, const char* to_name, int allow_none)
+#else
+static CYTHON_SMALL_CODE int __Pyx_copy_spec_to_module(PyObject *spec, PyObject *moddict, const char* from_name, const char* to_name, int allow_none)
+#endif
+{
+    PyObject *value = PyObject_GetAttrString(spec, from_name);
+    int result = 0;
+    if (likely(value)) {
+        if (allow_none || value != Py_None) {
+#if CYTHON_COMPILING_IN_LIMITED_API
+            result = PyModule_AddObject(module, to_name, value);
+#else
+            result = PyDict_SetItemString(moddict, to_name, value);
+#endif
+        }
+        Py_DECREF(value);
+    } else if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
+        PyErr_Clear();
+    } else {
+        result = -1;
+    }
+    return result;
+}
+
+static CYTHON_SMALL_CODE PyObject* ${pymodule_create_func_cname}(PyObject *spec, PyModuleDef *def) {
+    PyObject *module = NULL, *moddict, *modname;
+    CYTHON_UNUSED_VAR(def);
+
+    // For now, we only have exactly one module instance.
+    if (__Pyx_check_single_interpreter())
+        return NULL;
+    if (${module_cname})
+        return __Pyx_NewRef(${module_cname});
+
+    modname = PyObject_GetAttrString(spec, "name");
+    if (unlikely(!modname)) goto bad;
+
+    module = PyModule_NewObject(modname);
+    Py_DECREF(modname);
+    if (unlikely(!module)) goto bad;
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+    moddict = module;
+#else
+    moddict = PyModule_GetDict(module);
+    if (unlikely(!moddict)) goto bad;
+    // moddict is a borrowed reference
+#endif
+
+    if (unlikely(__Pyx_copy_spec_to_module(spec, moddict, "loader", "__loader__", 1) < 0)) goto bad;
+    if (unlikely(__Pyx_copy_spec_to_module(spec, moddict, "origin", "__file__", 1) < 0)) goto bad;
+    if (unlikely(__Pyx_copy_spec_to_module(spec, moddict, "parent", "__package__", 1) < 0)) goto bad;
+    if (unlikely(__Pyx_copy_spec_to_module(spec, moddict, "submodule_search_locations", "__path__", 0) < 0)) goto bad;
+
+    return module;
+bad:
+    Py_XDECREF(module);
+    return NULL;
+}
+//#endif
+
+
+/////////////// CodeObjectCache.proto ///////////////
+
+#if !CYTHON_COMPILING_IN_LIMITED_API
+typedef struct {
+    PyCodeObject* code_object;
+    int code_line;
+} __Pyx_CodeObjectCacheEntry;
+
+struct __Pyx_CodeObjectCache {
+    int count;
+    int max_count;
+    __Pyx_CodeObjectCacheEntry* entries;
+};
+
+static struct __Pyx_CodeObjectCache __pyx_code_cache = {0,0,NULL};
+
+static int __pyx_bisect_code_objects(__Pyx_CodeObjectCacheEntry* entries, int count, int code_line);
+static PyCodeObject *__pyx_find_code_object(int code_line);
+static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object);
+#endif
+
+/////////////// CodeObjectCache ///////////////
+// Note that errors are simply ignored in the code below.
+// This is just a cache, if a lookup or insertion fails - so what?
+
+#if !CYTHON_COMPILING_IN_LIMITED_API
+static int __pyx_bisect_code_objects(__Pyx_CodeObjectCacheEntry* entries, int count, int code_line) {
+    int start = 0, mid = 0, end = count - 1;
+    if (end >= 0 && code_line > entries[end].code_line) {
+        return count;
+    }
+    while (start < end) {
+        mid = start + (end - start) / 2;
+        if (code_line < entries[mid].code_line) {
+            end = mid;
+        } else if (code_line > entries[mid].code_line) {
+             start = mid + 1;
+        } else {
+            return mid;
+        }
+    }
+    if (code_line <= entries[mid].code_line) {
+        return mid;
+    } else {
+        return mid + 1;
+    }
+}
+
+static PyCodeObject *__pyx_find_code_object(int code_line) {
+    PyCodeObject* code_object;
+    int pos;
+    if (unlikely(!code_line) || unlikely(!__pyx_code_cache.entries)) {
+        return NULL;
+    }
+    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
+    if (unlikely(pos >= __pyx_code_cache.count) || unlikely(__pyx_code_cache.entries[pos].code_line != code_line)) {
+        return NULL;
+    }
+    code_object = __pyx_code_cache.entries[pos].code_object;
+    Py_INCREF(code_object);
+    return code_object;
+}
+
+static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object) {
+    int pos, i;
+    __Pyx_CodeObjectCacheEntry* entries = __pyx_code_cache.entries;
+    if (unlikely(!code_line)) {
+        return;
+    }
+    if (unlikely(!entries)) {
+        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Malloc(64*sizeof(__Pyx_CodeObjectCacheEntry));
+        if (likely(entries)) {
+            __pyx_code_cache.entries = entries;
+            __pyx_code_cache.max_count = 64;
+            __pyx_code_cache.count = 1;
+            entries[0].code_line = code_line;
+            entries[0].code_object = code_object;
+            Py_INCREF(code_object);
+        }
+        return;
+    }
+    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
+    if ((pos < __pyx_code_cache.count) && unlikely(__pyx_code_cache.entries[pos].code_line == code_line)) {
+        PyCodeObject* tmp = entries[pos].code_object;
+        entries[pos].code_object = code_object;
+        Py_DECREF(tmp);
+        return;
+    }
+    if (__pyx_code_cache.count == __pyx_code_cache.max_count) {
+        int new_max = __pyx_code_cache.max_count + 64;
+        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Realloc(
+            __pyx_code_cache.entries, ((size_t)new_max) * sizeof(__Pyx_CodeObjectCacheEntry));
+        if (unlikely(!entries)) {
+            return;
+        }
+        __pyx_code_cache.entries = entries;
+        __pyx_code_cache.max_count = new_max;
+    }
+    for (i=__pyx_code_cache.count; i>pos; i--) {
+        entries[i] = entries[i-1];
+    }
+    entries[pos].code_line = code_line;
+    entries[pos].code_object = code_object;
+    __pyx_code_cache.count++;
+    Py_INCREF(code_object);
+}
+#endif
+
+/////////////// CodeObjectCache.cleanup ///////////////
+
+  #if !CYTHON_COMPILING_IN_LIMITED_API
+  if (__pyx_code_cache.entries) {
+      __Pyx_CodeObjectCacheEntry* entries = __pyx_code_cache.entries;
+      int i, count = __pyx_code_cache.count;
+      __pyx_code_cache.count = 0;
+      __pyx_code_cache.max_count = 0;
+      __pyx_code_cache.entries = NULL;
+      for (i=0; i<count; i++) {
+          Py_DECREF(entries[i].code_object);
+      }
+      PyMem_Free(entries);
+  }
+  #endif
+
+/////////////// CheckBinaryVersion.proto ///////////////
+
+static unsigned long __Pyx_get_runtime_version(void);
+static int __Pyx_check_binary_version(unsigned long ct_version, unsigned long rt_version, int allow_newer);
+
+/////////////// CheckBinaryVersion ///////////////
+
+static unsigned long __Pyx_get_runtime_version(void) {
+    // We will probably never need the alpha/beta status, so avoid the complexity to parse it.
+#if __PYX_LIMITED_VERSION_HEX >= 0x030B00A4
+    return Py_Version & ~0xFFUL;
+#else
+    const char* rt_version = Py_GetVersion();
+    unsigned long version = 0;
+    unsigned long factor = 0x01000000UL;
+    unsigned int digit = 0;
+    int i = 0;
+    while (factor) {
+        while ('0' <= rt_version[i] && rt_version[i] <= '9') {
+            digit = digit * 10 + (unsigned int) (rt_version[i] - '0');
+            ++i;
+        }
+        version += factor * digit;
+        if (rt_version[i] != '.')
+            break;
+        digit = 0;
+        factor >>= 8;
+        ++i;
+    }
+    return version;
+#endif
+}
+
+static int __Pyx_check_binary_version(unsigned long ct_version, unsigned long rt_version, int allow_newer) {
+    // runtime version is: -1 => older, 0 => equal, 1 => newer
+    const unsigned long MAJOR_MINOR = 0xFFFF0000UL;
+    if ((rt_version & MAJOR_MINOR) == (ct_version & MAJOR_MINOR))
+        return 0;
+    if (likely(allow_newer && (rt_version & MAJOR_MINOR) > (ct_version & MAJOR_MINOR)))
+        return 1;
+
+    {
+        char message[200];
+        PyOS_snprintf(message, sizeof(message),
+                      "compile time Python version %d.%d "
+                      "of module '%.100s' "
+                      "%s "
+                      "runtime version %d.%d",
+                       (int) (ct_version >> 24), (int) ((ct_version >> 16) & 0xFF),
+                       __Pyx_MODULE_NAME,
+                       (allow_newer) ? "was newer than" : "does not match",
+                       (int) (rt_version >> 24), (int) ((rt_version >> 16) & 0xFF)
+       );
+        // returns 0 or -1
+        return PyErr_WarnEx(NULL, message, 1);
+    }
+}
+
+/////////////// IsLittleEndian.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_Is_Little_Endian(void);
+
+/////////////// IsLittleEndian ///////////////
+
+static CYTHON_INLINE int __Pyx_Is_Little_Endian(void)
+{
+  union {
+    uint32_t u32;
+    uint8_t u8[4];
+  } S;
+  S.u32 = 0x01020304;
+  return S.u8[0] == 4;
+}
+
+/////////////// Refnanny.proto ///////////////
+
+#ifndef CYTHON_REFNANNY
+  #define CYTHON_REFNANNY 0
+#endif
+
+#if CYTHON_REFNANNY
+  typedef struct {
+    void (*INCREF)(void*, PyObject*, Py_ssize_t);
+    void (*DECREF)(void*, PyObject*, Py_ssize_t);
+    void (*GOTREF)(void*, PyObject*, Py_ssize_t);
+    void (*GIVEREF)(void*, PyObject*, Py_ssize_t);
+    void* (*SetupContext)(const char*, Py_ssize_t, const char*);
+    void (*FinishContext)(void**);
+  } __Pyx_RefNannyAPIStruct;
+  static __Pyx_RefNannyAPIStruct *__Pyx_RefNanny = NULL;
+  static __Pyx_RefNannyAPIStruct *__Pyx_RefNannyImportAPI(const char *modname); /*proto*/
+  #define __Pyx_RefNannyDeclarations void *__pyx_refnanny = NULL;
+#ifdef WITH_THREAD
+  #define __Pyx_RefNannySetupContext(name, acquire_gil) \
+          if (acquire_gil) { \
+              PyGILState_STATE __pyx_gilstate_save = PyGILState_Ensure(); \
+              __pyx_refnanny = __Pyx_RefNanny->SetupContext((name), (__LINE__), (__FILE__)); \
+              PyGILState_Release(__pyx_gilstate_save); \
+          } else { \
+              __pyx_refnanny = __Pyx_RefNanny->SetupContext((name), (__LINE__), (__FILE__)); \
+          }
+  #define __Pyx_RefNannyFinishContextNogil() { \
+              PyGILState_STATE __pyx_gilstate_save = PyGILState_Ensure(); \
+              __Pyx_RefNannyFinishContext(); \
+              PyGILState_Release(__pyx_gilstate_save); \
+          }
+#else
+  #define __Pyx_RefNannySetupContext(name, acquire_gil) \
+          __pyx_refnanny = __Pyx_RefNanny->SetupContext((name), (__LINE__), (__FILE__))
+  #define __Pyx_RefNannyFinishContextNogil() __Pyx_RefNannyFinishContext()
+#endif
+  #define __Pyx_RefNannyFinishContextNogil() { \
+              PyGILState_STATE __pyx_gilstate_save = PyGILState_Ensure(); \
+              __Pyx_RefNannyFinishContext(); \
+              PyGILState_Release(__pyx_gilstate_save); \
+          }
+  #define __Pyx_RefNannyFinishContext() \
+          __Pyx_RefNanny->FinishContext(&__pyx_refnanny)
+  #define __Pyx_INCREF(r)  __Pyx_RefNanny->INCREF(__pyx_refnanny, (PyObject *)(r), (__LINE__))
+  #define __Pyx_DECREF(r)  __Pyx_RefNanny->DECREF(__pyx_refnanny, (PyObject *)(r), (__LINE__))
+  #define __Pyx_GOTREF(r)  __Pyx_RefNanny->GOTREF(__pyx_refnanny, (PyObject *)(r), (__LINE__))
+  #define __Pyx_GIVEREF(r) __Pyx_RefNanny->GIVEREF(__pyx_refnanny, (PyObject *)(r), (__LINE__))
+  #define __Pyx_XINCREF(r)  do { if((r) == NULL); else {__Pyx_INCREF(r); }} while(0)
+  #define __Pyx_XDECREF(r)  do { if((r) == NULL); else {__Pyx_DECREF(r); }} while(0)
+  #define __Pyx_XGOTREF(r)  do { if((r) == NULL); else {__Pyx_GOTREF(r); }} while(0)
+  #define __Pyx_XGIVEREF(r) do { if((r) == NULL); else {__Pyx_GIVEREF(r);}} while(0)
+#else
+  #define __Pyx_RefNannyDeclarations
+  #define __Pyx_RefNannySetupContext(name, acquire_gil)
+  #define __Pyx_RefNannyFinishContextNogil()
+  #define __Pyx_RefNannyFinishContext()
+  #define __Pyx_INCREF(r) Py_INCREF(r)
+  #define __Pyx_DECREF(r) Py_DECREF(r)
+  #define __Pyx_GOTREF(r)
+  #define __Pyx_GIVEREF(r)
+  #define __Pyx_XINCREF(r) Py_XINCREF(r)
+  #define __Pyx_XDECREF(r) Py_XDECREF(r)
+  #define __Pyx_XGOTREF(r)
+  #define __Pyx_XGIVEREF(r)
+#endif /* CYTHON_REFNANNY */
+
+#define __Pyx_Py_XDECREF_SET(r, v) do {                         \
+        PyObject *tmp = (PyObject *) r;                         \
+        r = v; Py_XDECREF(tmp);                                 \
+    } while (0)
+#define __Pyx_XDECREF_SET(r, v) do {                            \
+        PyObject *tmp = (PyObject *) r;                         \
+        r = v; __Pyx_XDECREF(tmp);                              \
+    } while (0)
+#define __Pyx_DECREF_SET(r, v) do {                             \
+        PyObject *tmp = (PyObject *) r;                         \
+        r = v; __Pyx_DECREF(tmp);                               \
+    } while (0)
+
+#define __Pyx_CLEAR(r)    do { PyObject* tmp = ((PyObject*)(r)); r = NULL; __Pyx_DECREF(tmp);} while(0)
+#define __Pyx_XCLEAR(r)   do { if((r) != NULL) {PyObject* tmp = ((PyObject*)(r)); r = NULL; __Pyx_DECREF(tmp);}} while(0)
+
+/////////////// Refnanny ///////////////
+
+#if CYTHON_REFNANNY
+static __Pyx_RefNannyAPIStruct *__Pyx_RefNannyImportAPI(const char *modname) {
+    PyObject *m = NULL, *p = NULL;
+    void *r = NULL;
+    m = PyImport_ImportModule(modname);
+    if (!m) goto end;
+    p = PyObject_GetAttrString(m, "RefNannyAPI");
+    if (!p) goto end;
+    r = PyLong_AsVoidPtr(p);
+end:
+    Py_XDECREF(p);
+    Py_XDECREF(m);
+    return (__Pyx_RefNannyAPIStruct *)r;
+}
+#endif /* CYTHON_REFNANNY */
+
+
+/////////////// ImportRefnannyAPI ///////////////
+
+#if CYTHON_REFNANNY
+__Pyx_RefNanny = __Pyx_RefNannyImportAPI("refnanny");
+if (!__Pyx_RefNanny) {
+  PyErr_Clear();
+  __Pyx_RefNanny = __Pyx_RefNannyImportAPI("Cython.Runtime.refnanny");
+  if (!__Pyx_RefNanny)
+      Py_FatalError("failed to import 'refnanny' module");
+}
+#endif
+
+
+/////////////// RegisterModuleCleanup.proto ///////////////
+//@substitute: naming
+
+static void ${cleanup_cname}(PyObject *self); /*proto*/
+
+#if PY_MAJOR_VERSION < 3 || CYTHON_COMPILING_IN_PYPY
+static int __Pyx_RegisterCleanup(void); /*proto*/
+#else
+#define __Pyx_RegisterCleanup() (0)
+#endif
+
+/////////////// RegisterModuleCleanup ///////////////
+//@substitute: naming
+
+#if PY_MAJOR_VERSION < 3 || CYTHON_COMPILING_IN_PYPY
+static PyObject* ${cleanup_cname}_atexit(PyObject *module, PyObject *unused) {
+    CYTHON_UNUSED_VAR(unused);
+    ${cleanup_cname}(module);
+    Py_INCREF(Py_None); return Py_None;
+}
+
+static int __Pyx_RegisterCleanup(void) {
+    // Don't use Py_AtExit because that has a 32-call limit and is called
+    // after python finalization.
+    // Also, we try to prepend the cleanup function to "atexit._exithandlers"
+    // in Py2 because CPython runs them last-to-first. Being run last allows
+    // user exit code to run before us that may depend on the globals
+    // and cached objects that we are about to clean up.
+
+    static PyMethodDef cleanup_def = {
+        "__cleanup", (PyCFunction)${cleanup_cname}_atexit, METH_NOARGS, 0};
+
+    PyObject *cleanup_func = 0;
+    PyObject *atexit = 0;
+    PyObject *reg = 0;
+    PyObject *args = 0;
+    PyObject *res = 0;
+    int ret = -1;
+
+    cleanup_func = PyCFunction_New(&cleanup_def, 0);
+    if (!cleanup_func)
+        goto bad;
+
+    atexit = PyImport_ImportModule("atexit");
+    if (!atexit)
+        goto bad;
+    reg = PyObject_GetAttrString(atexit, "_exithandlers");
+    if (reg && PyList_Check(reg)) {
+        PyObject *a, *kw;
+        a = PyTuple_New(0);
+        kw = PyDict_New();
+        if (!a || !kw) {
+            Py_XDECREF(a);
+            Py_XDECREF(kw);
+            goto bad;
+        }
+        args = PyTuple_Pack(3, cleanup_func, a, kw);
+        Py_DECREF(a);
+        Py_DECREF(kw);
+        if (!args)
+            goto bad;
+        ret = PyList_Insert(reg, 0, args);
+    } else {
+        if (!reg)
+            PyErr_Clear();
+        Py_XDECREF(reg);
+        reg = PyObject_GetAttrString(atexit, "register");
+        if (!reg)
+            goto bad;
+        args = PyTuple_Pack(1, cleanup_func);
+        if (!args)
+            goto bad;
+        res = PyObject_CallObject(reg, args);
+        if (!res)
+            goto bad;
+        ret = 0;
+    }
+bad:
+    Py_XDECREF(cleanup_func);
+    Py_XDECREF(atexit);
+    Py_XDECREF(reg);
+    Py_XDECREF(args);
+    Py_XDECREF(res);
+    return ret;
+}
+#endif
+
+/////////////// FastGil.init ///////////////
+#ifdef WITH_THREAD
+__Pyx_FastGilFuncInit();
+#endif
+
+/////////////// NoFastGil.proto ///////////////
+//@proto_block: utility_code_proto_before_types
+
+#define __Pyx_PyGILState_Ensure PyGILState_Ensure
+#define __Pyx_PyGILState_Release PyGILState_Release
+#define __Pyx_FastGIL_Remember()
+#define __Pyx_FastGIL_Forget()
+#define __Pyx_FastGilFuncInit()
+
+/////////////// FastGil.proto ///////////////
+//@proto_block: utility_code_proto_before_types
+
+#if CYTHON_FAST_GIL
+
+struct __Pyx_FastGilVtab {
+  PyGILState_STATE (*Fast_PyGILState_Ensure)(void);
+  void (*Fast_PyGILState_Release)(PyGILState_STATE oldstate);
+  void (*FastGIL_Remember)(void);
+  void (*FastGIL_Forget)(void);
+};
+
+static void __Pyx_FastGIL_Noop(void) {}
+static struct __Pyx_FastGilVtab __Pyx_FastGilFuncs = {
+  PyGILState_Ensure,
+  PyGILState_Release,
+  __Pyx_FastGIL_Noop,
+  __Pyx_FastGIL_Noop
+};
+
+static void __Pyx_FastGilFuncInit(void);
+
+#define __Pyx_PyGILState_Ensure __Pyx_FastGilFuncs.Fast_PyGILState_Ensure
+#define __Pyx_PyGILState_Release __Pyx_FastGilFuncs.Fast_PyGILState_Release
+#define __Pyx_FastGIL_Remember __Pyx_FastGilFuncs.FastGIL_Remember
+#define __Pyx_FastGIL_Forget __Pyx_FastGilFuncs.FastGIL_Forget
+
+#ifdef WITH_THREAD
+  #ifndef CYTHON_THREAD_LOCAL
+    #if defined(__cplusplus) && __cplusplus >= 201103L
+      #define CYTHON_THREAD_LOCAL thread_local
+    #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112
+      #define CYTHON_THREAD_LOCAL _Thread_local
+    #elif defined(__GNUC__)
+      #define CYTHON_THREAD_LOCAL __thread
+    #elif defined(_MSC_VER)
+      #define CYTHON_THREAD_LOCAL __declspec(thread)
+    #endif
+  #endif
+#endif
+
+#else
+#define __Pyx_PyGILState_Ensure PyGILState_Ensure
+#define __Pyx_PyGILState_Release PyGILState_Release
+#define __Pyx_FastGIL_Remember()
+#define __Pyx_FastGIL_Forget()
+#define __Pyx_FastGilFuncInit()
+#endif
+
+/////////////// FastGil ///////////////
+// The implementations of PyGILState_Ensure/Release calls PyThread_get_key_value
+// several times which is turns out to be quite slow (slower in fact than
+// acquiring the GIL itself).  Simply storing it in a thread local for the
+// common case is much faster.
+// To make optimal use of this thread local, we attempt to share it between
+// modules.
+
+#if CYTHON_FAST_GIL
+
+#define __Pyx_FastGIL_ABI_module __PYX_ABI_MODULE_NAME
+#define __Pyx_FastGIL_PyCapsuleName "FastGilFuncs"
+#define __Pyx_FastGIL_PyCapsule \
+    __Pyx_FastGIL_ABI_module "." __Pyx_FastGIL_PyCapsuleName
+
+#ifdef CYTHON_THREAD_LOCAL
+
+#include "pythread.h"
+#include "pystate.h"
+
+static CYTHON_THREAD_LOCAL PyThreadState *__Pyx_FastGil_tcur = NULL;
+static CYTHON_THREAD_LOCAL int __Pyx_FastGil_tcur_depth = 0;
+static int __Pyx_FastGil_autoTLSkey = -1;
+
+static CYTHON_INLINE void __Pyx_FastGIL_Remember0(void) {
+  ++__Pyx_FastGil_tcur_depth;
+}
+
+static CYTHON_INLINE void __Pyx_FastGIL_Forget0(void) {
+  if (--__Pyx_FastGil_tcur_depth == 0) {
+    __Pyx_FastGil_tcur = NULL;
+  }
+}
+
+static CYTHON_INLINE PyThreadState *__Pyx_FastGil_get_tcur(void) {
+  PyThreadState *tcur = __Pyx_FastGil_tcur;
+  if (tcur == NULL) {
+    tcur = __Pyx_FastGil_tcur = (PyThreadState*)PyThread_get_key_value(__Pyx_FastGil_autoTLSkey);
+  }
+  return tcur;
+}
+
+static PyGILState_STATE __Pyx_FastGil_PyGILState_Ensure(void) {
+  int current;
+  PyThreadState *tcur;
+  __Pyx_FastGIL_Remember0();
+  tcur = __Pyx_FastGil_get_tcur();
+  if (tcur == NULL) {
+    // Uninitialized, need to initialize now.
+    return PyGILState_Ensure();
+  }
+  current = tcur == __Pyx_PyThreadState_Current;
+  if (current == 0) {
+    PyEval_RestoreThread(tcur);
+  }
+  ++tcur->gilstate_counter;
+  return current ? PyGILState_LOCKED : PyGILState_UNLOCKED;
+}
+
+static void __Pyx_FastGil_PyGILState_Release(PyGILState_STATE oldstate) {
+  PyThreadState *tcur = __Pyx_FastGil_get_tcur();
+  __Pyx_FastGIL_Forget0();
+  if (tcur->gilstate_counter == 1) {
+    // This is the last lock, do all the cleanup as well.
+    PyGILState_Release(oldstate);
+  } else {
+    --tcur->gilstate_counter;
+    if (oldstate == PyGILState_UNLOCKED) {
+      PyEval_SaveThread();
+    }
+  }
+}
+
+static void __Pyx_FastGilFuncInit0(void) {
+  /* Try to detect autoTLSkey. */
+  int key;
+  void* this_thread_state = (void*) PyGILState_GetThisThreadState();
+  for (key = 0; key < 100; key++) {
+    if (PyThread_get_key_value(key) == this_thread_state) {
+      __Pyx_FastGil_autoTLSkey = key;
+      break;
+    }
+  }
+  if (__Pyx_FastGil_autoTLSkey != -1) {
+    PyObject* capsule = NULL;
+    PyObject* abi_module = NULL;
+    __Pyx_PyGILState_Ensure = __Pyx_FastGil_PyGILState_Ensure;
+    __Pyx_PyGILState_Release = __Pyx_FastGil_PyGILState_Release;
+    __Pyx_FastGIL_Remember = __Pyx_FastGIL_Remember0;
+    __Pyx_FastGIL_Forget = __Pyx_FastGIL_Forget0;
+    capsule = PyCapsule_New(&__Pyx_FastGilFuncs, __Pyx_FastGIL_PyCapsule, NULL);
+    if (capsule) {
+        abi_module = __Pyx_PyImport_AddModuleRef(__Pyx_FastGIL_ABI_module);
+        if (abi_module) {
+          PyObject_SetAttrString(abi_module, __Pyx_FastGIL_PyCapsuleName, capsule);
+          Py_DECREF(abi_module);
+        }
+    }
+    Py_XDECREF(capsule);
+  }
+}
+
+#else
+
+static void __Pyx_FastGilFuncInit0(void) {
+}
+
+#endif
+
+static void __Pyx_FastGilFuncInit(void) {
+  struct __Pyx_FastGilVtab* shared = (struct __Pyx_FastGilVtab*)PyCapsule_Import(__Pyx_FastGIL_PyCapsule, 1);
+  if (shared) {
+    __Pyx_FastGilFuncs = *shared;
+  } else {
+   PyErr_Clear();
+    __Pyx_FastGilFuncInit0();
+  }
+}
+
+#endif
+
+///////////////////// UtilityCodePragmas /////////////////////////
+
+#ifdef _MSC_VER
+#pragma warning( push )
+/* Warning 4127: conditional expression is constant
+ * Cython uses constant conditional expressions to allow in inline functions to be optimized at
+ * compile-time, so this warning is not useful
+ */
+#pragma warning( disable : 4127 )
+#endif
+
+///////////////////// UtilityCodePragmasEnd //////////////////////
+
+#ifdef _MSC_VER
+#pragma warning( pop )  /* undo whatever Cython has done to warnings */
+#endif
diff --git a/contrib/tools/cython_py2/Cython/Utility/NumpyImportArray.c b/contrib/tools/cython_py2/Cython/Utility/NumpyImportArray.c
new file mode 100644
index 00000000000..37f74da794e
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/NumpyImportArray.c
@@ -0,0 +1,46 @@
+///////////////////////// NumpyImportArray.init ////////////////////
+
+// comment below is deliberately kept in the generated C file to
+// help users debug where this came from:
+/*
+ * Cython has automatically inserted a call to _import_array since
+ * you didn't include one when you cimported numpy. To disable this
+ * add the line
+ *   <void>numpy._import_array
+ */
+#ifdef NPY_FEATURE_VERSION /* This is a public define that makes us reasonably confident it's "real" Numpy */
+// NO_IMPORT_ARRAY is Numpy's mechanism for indicating that import_array is handled elsewhere
+#ifndef NO_IMPORT_ARRAY /* https://numpy.org/doc/stable/reference/c-api/array.html#c.NO_IMPORT_ARRAY  */
+if (unlikely(_import_array() == -1)) {
+    PyErr_SetString(PyExc_ImportError, "numpy.core.multiarray failed to import "
+    "(auto-generated because you didn't call 'numpy.import_array()' after cimporting numpy; "
+    "use '<void>numpy._import_array' to disable if you are certain you don't need it).");
+}
+#endif
+#endif
+
+///////////////////////// NumpyImportUFunc.init ////////////////////
+
+// Unlike import_array, this is generated by the @cython.ufunc decorator
+// so we're confident the right headers are present and don't need to override them
+
+{
+    // NO_IMPORT_UFUNC is Numpy's mechanism for indicating that import_umath is handled elsewhere
+#ifndef NO_IMPORT_UFUNC /* https://numpy.org/doc/stable/reference/c-api/ufunc.html#c.NO_IMPORT_UFUNC */
+    if (unlikely(_import_umath() == -1)) {
+        PyErr_SetString(PyExc_ImportError, "numpy.core.umath failed to import "
+        "(auto-generated by @cython.ufunc).");
+    }
+#else
+    if ((0)) {}
+#endif
+    // NO_IMPORT_ARRAY is Numpy's mechanism for indicating that import_array is handled elsewhere
+#ifndef NO_IMPORT_ARRAY /* https://numpy.org/doc/stable/reference/c-api/array.html#c.NO_IMPORT_ARRAY  */
+    else if (unlikely(_import_array() == -1)) {
+        PyErr_SetString(PyExc_ImportError, "numpy.core.multiarray failed to import "
+        "(auto-generated by @cython.ufunc).");
+    }
+#endif
+}
+
+
diff --git a/contrib/tools/cython_py2/Cython/Utility/ObjectHandling.c b/contrib/tools/cython_py2/Cython/Utility/ObjectHandling.c
new file mode 100644
index 00000000000..8147a907457
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/ObjectHandling.c
@@ -0,0 +1,3266 @@
+/*
+ * General object operations and protocol implementations,
+ * including their specialisations for certain builtins.
+ *
+ * Optional optimisations for builtins are in Optimize.c.
+ *
+ * Required replacements of builtins are in Builtins.c.
+ */
+
+/////////////// RaiseNoneIterError.proto ///////////////
+
+static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void);
+
+/////////////// RaiseNoneIterError ///////////////
+
+static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void) {
+    PyErr_SetString(PyExc_TypeError, "'NoneType' object is not iterable");
+}
+
+/////////////// RaiseTooManyValuesToUnpack.proto ///////////////
+
+static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected);
+
+/////////////// RaiseTooManyValuesToUnpack ///////////////
+
+static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected) {
+    PyErr_Format(PyExc_ValueError,
+                 "too many values to unpack (expected %" CYTHON_FORMAT_SSIZE_T "d)", expected);
+}
+
+/////////////// RaiseNeedMoreValuesToUnpack.proto ///////////////
+
+static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index);
+
+/////////////// RaiseNeedMoreValuesToUnpack ///////////////
+
+static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index) {
+    PyErr_Format(PyExc_ValueError,
+                 "need more than %" CYTHON_FORMAT_SSIZE_T "d value%.1s to unpack",
+                 index, (index == 1) ? "" : "s");
+}
+
+/////////////// UnpackTupleError.proto ///////////////
+
+static void __Pyx_UnpackTupleError(PyObject *, Py_ssize_t index); /*proto*/
+
+/////////////// UnpackTupleError ///////////////
+//@requires: RaiseNoneIterError
+//@requires: RaiseNeedMoreValuesToUnpack
+//@requires: RaiseTooManyValuesToUnpack
+
+static void __Pyx_UnpackTupleError(PyObject *t, Py_ssize_t index) {
+    if (t == Py_None) {
+      __Pyx_RaiseNoneNotIterableError();
+    } else if (PyTuple_GET_SIZE(t) < index) {
+      __Pyx_RaiseNeedMoreValuesError(PyTuple_GET_SIZE(t));
+    } else {
+      __Pyx_RaiseTooManyValuesError(index);
+    }
+}
+
+/////////////// UnpackItemEndCheck.proto ///////////////
+
+static int __Pyx_IternextUnpackEndCheck(PyObject *retval, Py_ssize_t expected); /*proto*/
+
+/////////////// UnpackItemEndCheck ///////////////
+//@requires: RaiseTooManyValuesToUnpack
+//@requires: IterFinish
+
+static int __Pyx_IternextUnpackEndCheck(PyObject *retval, Py_ssize_t expected) {
+    if (unlikely(retval)) {
+        Py_DECREF(retval);
+        __Pyx_RaiseTooManyValuesError(expected);
+        return -1;
+    }
+
+    return __Pyx_IterFinish();
+}
+
+/////////////// UnpackTuple2.proto ///////////////
+
+#define __Pyx_unpack_tuple2(tuple, value1, value2, is_tuple, has_known_size, decref_tuple) \
+    (likely(is_tuple || PyTuple_Check(tuple)) ? \
+        (likely(has_known_size || PyTuple_GET_SIZE(tuple) == 2) ? \
+            __Pyx_unpack_tuple2_exact(tuple, value1, value2, decref_tuple) : \
+            (__Pyx_UnpackTupleError(tuple, 2), -1)) : \
+        __Pyx_unpack_tuple2_generic(tuple, value1, value2, has_known_size, decref_tuple))
+
+static CYTHON_INLINE int __Pyx_unpack_tuple2_exact(
+    PyObject* tuple, PyObject** value1, PyObject** value2, int decref_tuple);
+static int __Pyx_unpack_tuple2_generic(
+    PyObject* tuple, PyObject** value1, PyObject** value2, int has_known_size, int decref_tuple);
+
+/////////////// UnpackTuple2 ///////////////
+//@requires: UnpackItemEndCheck
+//@requires: UnpackTupleError
+//@requires: RaiseNeedMoreValuesToUnpack
+
+static CYTHON_INLINE int __Pyx_unpack_tuple2_exact(
+        PyObject* tuple, PyObject** pvalue1, PyObject** pvalue2, int decref_tuple) {
+    PyObject *value1 = NULL, *value2 = NULL;
+#if CYTHON_COMPILING_IN_PYPY
+    value1 = PySequence_ITEM(tuple, 0);  if (unlikely(!value1)) goto bad;
+    value2 = PySequence_ITEM(tuple, 1);  if (unlikely(!value2)) goto bad;
+#else
+    value1 = PyTuple_GET_ITEM(tuple, 0);  Py_INCREF(value1);
+    value2 = PyTuple_GET_ITEM(tuple, 1);  Py_INCREF(value2);
+#endif
+    if (decref_tuple) {
+        Py_DECREF(tuple);
+    }
+
+    *pvalue1 = value1;
+    *pvalue2 = value2;
+    return 0;
+#if CYTHON_COMPILING_IN_PYPY
+bad:
+    Py_XDECREF(value1);
+    Py_XDECREF(value2);
+    if (decref_tuple) { Py_XDECREF(tuple); }
+    return -1;
+#endif
+}
+
+static int __Pyx_unpack_tuple2_generic(PyObject* tuple, PyObject** pvalue1, PyObject** pvalue2,
+                                       int has_known_size, int decref_tuple) {
+    Py_ssize_t index;
+    PyObject *value1 = NULL, *value2 = NULL, *iter = NULL;
+    iternextfunc iternext;
+
+    iter = PyObject_GetIter(tuple);
+    if (unlikely(!iter)) goto bad;
+    if (decref_tuple) { Py_DECREF(tuple); tuple = NULL; }
+
+    iternext = __Pyx_PyObject_GetIterNextFunc(iter);
+    value1 = iternext(iter); if (unlikely(!value1)) { index = 0; goto unpacking_failed; }
+    value2 = iternext(iter); if (unlikely(!value2)) { index = 1; goto unpacking_failed; }
+    if (!has_known_size && unlikely(__Pyx_IternextUnpackEndCheck(iternext(iter), 2))) goto bad;
+
+    Py_DECREF(iter);
+    *pvalue1 = value1;
+    *pvalue2 = value2;
+    return 0;
+
+unpacking_failed:
+    if (!has_known_size && __Pyx_IterFinish() == 0)
+        __Pyx_RaiseNeedMoreValuesError(index);
+bad:
+    Py_XDECREF(iter);
+    Py_XDECREF(value1);
+    Py_XDECREF(value2);
+    if (decref_tuple) { Py_XDECREF(tuple); }
+    return -1;
+}
+
+
+/////////////// IterNext.proto ///////////////
+
+#define __Pyx_PyIter_Next(obj) __Pyx_PyIter_Next2(obj, NULL)
+static CYTHON_INLINE PyObject *__Pyx_PyIter_Next2(PyObject *, PyObject *); /*proto*/
+
+/////////////// IterNext ///////////////
+//@requires: Exceptions.c::PyThreadStateGet
+//@requires: Exceptions.c::PyErrFetchRestore
+
+static PyObject *__Pyx_PyIter_Next2Default(PyObject* defval) {
+    PyObject* exc_type;
+    __Pyx_PyThreadState_declare
+    __Pyx_PyThreadState_assign
+    exc_type = __Pyx_PyErr_CurrentExceptionType();
+    if (unlikely(exc_type)) {
+        if (!defval || unlikely(!__Pyx_PyErr_GivenExceptionMatches(exc_type, PyExc_StopIteration)))
+            return NULL;
+        __Pyx_PyErr_Clear();
+        Py_INCREF(defval);
+        return defval;
+    }
+    if (defval) {
+        Py_INCREF(defval);
+        return defval;
+    }
+    __Pyx_PyErr_SetNone(PyExc_StopIteration);
+    return NULL;
+}
+
+static void __Pyx_PyIter_Next_ErrorNoIterator(PyObject *iterator) {
+    __Pyx_TypeName iterator_type_name = __Pyx_PyType_GetName(Py_TYPE(iterator));
+    PyErr_Format(PyExc_TypeError,
+        __Pyx_FMT_TYPENAME " object is not an iterator", iterator_type_name);
+    __Pyx_DECREF_TypeName(iterator_type_name);
+}
+
+// originally copied from Py3's builtin_next()
+static CYTHON_INLINE PyObject *__Pyx_PyIter_Next2(PyObject* iterator, PyObject* defval) {
+    PyObject* next;
+    // We always do a quick slot check because calling PyIter_Check() is so wasteful.
+    iternextfunc iternext = Py_TYPE(iterator)->tp_iternext;
+    if (likely(iternext)) {
+#if CYTHON_USE_TYPE_SLOTS || CYTHON_COMPILING_IN_PYPY
+        next = iternext(iterator);
+        if (likely(next))
+            return next;
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x030d0000
+        if (unlikely(iternext == &_PyObject_NextNotImplemented))
+            return NULL;
+#endif
+#else
+        // Since the slot was set, assume that PyIter_Next() will likely succeed, and properly fail otherwise.
+        // Note: PyIter_Next() crashes in CPython if "tp_iternext" is NULL.
+        next = PyIter_Next(iterator);
+        if (likely(next))
+            return next;
+#endif
+    } else if (CYTHON_USE_TYPE_SLOTS || unlikely(!PyIter_Check(iterator))) {
+        // If CYTHON_USE_TYPE_SLOTS, then the slot was not set and we don't have an iterable.
+        // Otherwise, don't trust "tp_iternext" and rely on PyIter_Check().
+        __Pyx_PyIter_Next_ErrorNoIterator(iterator);
+        return NULL;
+    }
+#if !CYTHON_USE_TYPE_SLOTS
+    else {
+        // We have an iterator with an empty "tp_iternext", but didn't call next() on it yet.
+        next = PyIter_Next(iterator);
+        if (likely(next))
+            return next;
+    }
+#endif
+    return __Pyx_PyIter_Next2Default(defval);
+}
+
+/////////////// IterFinish.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_IterFinish(void); /*proto*/
+
+/////////////// IterFinish ///////////////
+//@requires: Exceptions.c::PyThreadStateGet
+//@requires: Exceptions.c::PyErrFetchRestore
+
+// When PyIter_Next(iter) has returned NULL in order to signal termination,
+// this function does the right cleanup and returns 0 on success.  If it
+// detects an error that occurred in the iterator, it returns -1.
+
+static CYTHON_INLINE int __Pyx_IterFinish(void) {
+    PyObject* exc_type;
+    __Pyx_PyThreadState_declare
+    __Pyx_PyThreadState_assign
+    exc_type = __Pyx_PyErr_CurrentExceptionType();
+    if (unlikely(exc_type)) {
+        if (unlikely(!__Pyx_PyErr_GivenExceptionMatches(exc_type, PyExc_StopIteration)))
+            return -1;
+        __Pyx_PyErr_Clear();
+        return 0;
+    }
+    return 0;
+}
+
+
+/////////////// ObjectGetItem.proto ///////////////
+
+#if CYTHON_USE_TYPE_SLOTS
+static CYTHON_INLINE PyObject *__Pyx_PyObject_GetItem(PyObject *obj, PyObject *key);/*proto*/
+#else
+#define __Pyx_PyObject_GetItem(obj, key)  PyObject_GetItem(obj, key)
+#endif
+
+/////////////// ObjectGetItem ///////////////
+// //@requires: GetItemInt - added in IndexNode as it uses templating.
+//@requires: PyObjectGetAttrStrNoError
+//@requires: PyObjectCallOneArg
+
+#if CYTHON_USE_TYPE_SLOTS
+static PyObject *__Pyx_PyObject_GetIndex(PyObject *obj, PyObject *index) {
+    // Get element from sequence object `obj` at index `index`.
+    PyObject *runerr = NULL;
+    Py_ssize_t key_value;
+    key_value = __Pyx_PyIndex_AsSsize_t(index);
+    if (likely(key_value != -1 || !(runerr = PyErr_Occurred()))) {
+        return __Pyx_GetItemInt_Fast(obj, key_value, 0, 1, 1);
+    }
+
+    // Error handling code -- only manage OverflowError differently.
+    if (PyErr_GivenExceptionMatches(runerr, PyExc_OverflowError)) {
+        __Pyx_TypeName index_type_name = __Pyx_PyType_GetName(Py_TYPE(index));
+        PyErr_Clear();
+        PyErr_Format(PyExc_IndexError,
+            "cannot fit '" __Pyx_FMT_TYPENAME "' into an index-sized integer", index_type_name);
+        __Pyx_DECREF_TypeName(index_type_name);
+    }
+    return NULL;
+}
+
+static PyObject *__Pyx_PyObject_GetItem_Slow(PyObject *obj, PyObject *key) {
+    __Pyx_TypeName obj_type_name;
+    // Handles less common slow-path checks for GetItem
+    if (likely(PyType_Check(obj))) {
+        PyObject *meth = __Pyx_PyObject_GetAttrStrNoError(obj, PYIDENT("__class_getitem__"));
+        if (!meth) {
+            PyErr_Clear();
+        } else {
+            PyObject *result = __Pyx_PyObject_CallOneArg(meth, key);
+            Py_DECREF(meth);
+            return result;
+        }
+    }
+
+    obj_type_name = __Pyx_PyType_GetName(Py_TYPE(obj));
+    PyErr_Format(PyExc_TypeError,
+        "'" __Pyx_FMT_TYPENAME "' object is not subscriptable", obj_type_name);
+    __Pyx_DECREF_TypeName(obj_type_name);
+    return NULL;
+}
+
+static PyObject *__Pyx_PyObject_GetItem(PyObject *obj, PyObject *key) {
+    PyTypeObject *tp = Py_TYPE(obj);
+    PyMappingMethods *mm = tp->tp_as_mapping;
+    PySequenceMethods *sm = tp->tp_as_sequence;
+
+    if (likely(mm && mm->mp_subscript)) {
+        return mm->mp_subscript(obj, key);
+    }
+    if (likely(sm && sm->sq_item)) {
+        return __Pyx_PyObject_GetIndex(obj, key);
+    }
+    return __Pyx_PyObject_GetItem_Slow(obj, key);
+}
+#endif
+
+
+/////////////// DictGetItem.proto ///////////////
+
+#if PY_MAJOR_VERSION >= 3 && !CYTHON_COMPILING_IN_PYPY
+static PyObject *__Pyx_PyDict_GetItem(PyObject *d, PyObject* key);/*proto*/
+
+#define __Pyx_PyObject_Dict_GetItem(obj, name) \
+    (likely(PyDict_CheckExact(obj)) ? \
+     __Pyx_PyDict_GetItem(obj, name) : PyObject_GetItem(obj, name))
+
+#else
+#define __Pyx_PyDict_GetItem(d, key) PyObject_GetItem(d, key)
+#define __Pyx_PyObject_Dict_GetItem(obj, name)  PyObject_GetItem(obj, name)
+#endif
+
+/////////////// DictGetItem ///////////////
+
+#if PY_MAJOR_VERSION >= 3 && !CYTHON_COMPILING_IN_PYPY
+static PyObject *__Pyx_PyDict_GetItem(PyObject *d, PyObject* key) {
+    PyObject *value;
+    value = PyDict_GetItemWithError(d, key);
+    if (unlikely(!value)) {
+        if (!PyErr_Occurred()) {
+            if (unlikely(PyTuple_Check(key))) {
+                // CPython interprets tuples as separate arguments => must wrap them in another tuple.
+                PyObject* args = PyTuple_Pack(1, key);
+                if (likely(args)) {
+                    PyErr_SetObject(PyExc_KeyError, args);
+                    Py_DECREF(args);
+                }
+            } else {
+                // Avoid tuple packing if possible.
+                PyErr_SetObject(PyExc_KeyError, key);
+            }
+        }
+        return NULL;
+    }
+    Py_INCREF(value);
+    return value;
+}
+#endif
+
+/////////////// GetItemInt.proto ///////////////
+//@substitute: tempita
+
+#define __Pyx_GetItemInt(o, i, type, is_signed, to_py_func, is_list, wraparound, boundscheck) \
+    (__Pyx_fits_Py_ssize_t(i, type, is_signed) ? \
+    __Pyx_GetItemInt_Fast(o, (Py_ssize_t)i, is_list, wraparound, boundscheck) : \
+    (is_list ? (PyErr_SetString(PyExc_IndexError, "list index out of range"), (PyObject*)NULL) : \
+               __Pyx_GetItemInt_Generic(o, to_py_func(i))))
+
+{{for type in ['List', 'Tuple']}}
+#define __Pyx_GetItemInt_{{type}}(o, i, type, is_signed, to_py_func, is_list, wraparound, boundscheck) \
+    (__Pyx_fits_Py_ssize_t(i, type, is_signed) ? \
+    __Pyx_GetItemInt_{{type}}_Fast(o, (Py_ssize_t)i, wraparound, boundscheck) : \
+    (PyErr_SetString(PyExc_IndexError, "{{ type.lower() }} index out of range"), (PyObject*)NULL))
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_{{type}}_Fast(PyObject *o, Py_ssize_t i,
+                                                              int wraparound, int boundscheck);
+{{endfor}}
+
+static PyObject *__Pyx_GetItemInt_Generic(PyObject *o, PyObject* j);
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Fast(PyObject *o, Py_ssize_t i,
+                                                     int is_list, int wraparound, int boundscheck);
+
+/////////////// GetItemInt ///////////////
+//@substitute: tempita
+
+static PyObject *__Pyx_GetItemInt_Generic(PyObject *o, PyObject* j) {
+    PyObject *r;
+    if (unlikely(!j)) return NULL;
+    r = PyObject_GetItem(o, j);
+    Py_DECREF(j);
+    return r;
+}
+
+{{for type in ['List', 'Tuple']}}
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_{{type}}_Fast(PyObject *o, Py_ssize_t i,
+                                                              CYTHON_NCP_UNUSED int wraparound,
+                                                              CYTHON_NCP_UNUSED int boundscheck) {
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+    Py_ssize_t wrapped_i = i;
+    if (wraparound & unlikely(i < 0)) {
+        wrapped_i += Py{{type}}_GET_SIZE(o);
+    }
+    if ((!boundscheck) || likely(__Pyx_is_valid_index(wrapped_i, Py{{type}}_GET_SIZE(o)))) {
+        PyObject *r = Py{{type}}_GET_ITEM(o, wrapped_i);
+        Py_INCREF(r);
+        return r;
+    }
+    return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
+#else
+    return PySequence_GetItem(o, i);
+#endif
+}
+{{endfor}}
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Fast(PyObject *o, Py_ssize_t i, int is_list,
+                                                     CYTHON_NCP_UNUSED int wraparound,
+                                                     CYTHON_NCP_UNUSED int boundscheck) {
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS && CYTHON_USE_TYPE_SLOTS
+    if (is_list || PyList_CheckExact(o)) {
+        Py_ssize_t n = ((!wraparound) | likely(i >= 0)) ? i : i + PyList_GET_SIZE(o);
+        if ((!boundscheck) || (likely(__Pyx_is_valid_index(n, PyList_GET_SIZE(o))))) {
+            PyObject *r = PyList_GET_ITEM(o, n);
+            Py_INCREF(r);
+            return r;
+        }
+    }
+    else if (PyTuple_CheckExact(o)) {
+        Py_ssize_t n = ((!wraparound) | likely(i >= 0)) ? i : i + PyTuple_GET_SIZE(o);
+        if ((!boundscheck) || likely(__Pyx_is_valid_index(n, PyTuple_GET_SIZE(o)))) {
+            PyObject *r = PyTuple_GET_ITEM(o, n);
+            Py_INCREF(r);
+            return r;
+        }
+    } else {
+        // inlined PySequence_GetItem() + special cased length overflow
+        PyMappingMethods *mm = Py_TYPE(o)->tp_as_mapping;
+        PySequenceMethods *sm = Py_TYPE(o)->tp_as_sequence;
+        if (mm && mm->mp_subscript) {
+            PyObject *r, *key = PyInt_FromSsize_t(i);
+            if (unlikely(!key)) return NULL;
+            r = mm->mp_subscript(o, key);
+            Py_DECREF(key);
+            return r;
+        }
+        if (likely(sm && sm->sq_item)) {
+            if (wraparound && unlikely(i < 0) && likely(sm->sq_length)) {
+                Py_ssize_t l = sm->sq_length(o);
+                if (likely(l >= 0)) {
+                    i += l;
+                } else {
+                    // if length > max(Py_ssize_t), maybe the object can wrap around itself?
+                    if (!PyErr_ExceptionMatches(PyExc_OverflowError))
+                        return NULL;
+                    PyErr_Clear();
+                }
+            }
+            return sm->sq_item(o, i);
+        }
+    }
+#else
+    // PySequence_GetItem behaves differently to PyObject_GetItem for i<0
+    // and possibly some other cases so can't generally be substituted
+    if (is_list || !PyMapping_Check(o)) {
+        return PySequence_GetItem(o, i);
+    }
+#endif
+    return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
+}
+
+/////////////// SetItemInt.proto ///////////////
+
+#define __Pyx_SetItemInt(o, i, v, type, is_signed, to_py_func, is_list, wraparound, boundscheck) \
+    (__Pyx_fits_Py_ssize_t(i, type, is_signed) ? \
+    __Pyx_SetItemInt_Fast(o, (Py_ssize_t)i, v, is_list, wraparound, boundscheck) : \
+    (is_list ? (PyErr_SetString(PyExc_IndexError, "list assignment index out of range"), -1) : \
+               __Pyx_SetItemInt_Generic(o, to_py_func(i), v)))
+
+static int __Pyx_SetItemInt_Generic(PyObject *o, PyObject *j, PyObject *v);
+static CYTHON_INLINE int __Pyx_SetItemInt_Fast(PyObject *o, Py_ssize_t i, PyObject *v,
+                                               int is_list, int wraparound, int boundscheck);
+
+/////////////// SetItemInt ///////////////
+
+static int __Pyx_SetItemInt_Generic(PyObject *o, PyObject *j, PyObject *v) {
+    int r;
+    if (unlikely(!j)) return -1;
+    r = PyObject_SetItem(o, j, v);
+    Py_DECREF(j);
+    return r;
+}
+
+static CYTHON_INLINE int __Pyx_SetItemInt_Fast(PyObject *o, Py_ssize_t i, PyObject *v, int is_list,
+                                               CYTHON_NCP_UNUSED int wraparound, CYTHON_NCP_UNUSED int boundscheck) {
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS && CYTHON_USE_TYPE_SLOTS
+    if (is_list || PyList_CheckExact(o)) {
+        Py_ssize_t n = (!wraparound) ? i : ((likely(i >= 0)) ? i : i + PyList_GET_SIZE(o));
+        if ((!boundscheck) || likely(__Pyx_is_valid_index(n, PyList_GET_SIZE(o)))) {
+            PyObject* old = PyList_GET_ITEM(o, n);
+            Py_INCREF(v);
+            PyList_SET_ITEM(o, n, v);
+            Py_DECREF(old);
+            return 1;
+        }
+    } else {
+        // inlined PySequence_SetItem() + special cased length overflow
+        PyMappingMethods *mm = Py_TYPE(o)->tp_as_mapping;
+        PySequenceMethods *sm = Py_TYPE(o)->tp_as_sequence;
+        if (mm && mm->mp_ass_subscript) {
+            int r;
+            PyObject *key = PyInt_FromSsize_t(i);
+            if (unlikely(!key)) return -1;
+            r = mm->mp_ass_subscript(o, key, v);
+            Py_DECREF(key);
+            return r;
+        }
+        if (likely(sm && sm->sq_ass_item)) {
+            if (wraparound && unlikely(i < 0) && likely(sm->sq_length)) {
+                Py_ssize_t l = sm->sq_length(o);
+                if (likely(l >= 0)) {
+                    i += l;
+                } else {
+                    // if length > max(Py_ssize_t), maybe the object can wrap around itself?
+                    if (!PyErr_ExceptionMatches(PyExc_OverflowError))
+                        return -1;
+                    PyErr_Clear();
+                }
+            }
+            return sm->sq_ass_item(o, i, v);
+        }
+    }
+#else
+    // PySequence_SetItem behaves differently to PyObject_SetItem for i<0
+    // and possibly some other cases so can't generally be substituted
+    if (is_list || !PyMapping_Check(o))
+    {
+        return PySequence_SetItem(o, i, v);
+    }
+#endif
+    return __Pyx_SetItemInt_Generic(o, PyInt_FromSsize_t(i), v);
+}
+
+
+/////////////// DelItemInt.proto ///////////////
+
+#define __Pyx_DelItemInt(o, i, type, is_signed, to_py_func, is_list, wraparound, boundscheck) \
+    (__Pyx_fits_Py_ssize_t(i, type, is_signed) ? \
+    __Pyx_DelItemInt_Fast(o, (Py_ssize_t)i, is_list, wraparound) : \
+    (is_list ? (PyErr_SetString(PyExc_IndexError, "list assignment index out of range"), -1) : \
+               __Pyx_DelItem_Generic(o, to_py_func(i))))
+
+static int __Pyx_DelItem_Generic(PyObject *o, PyObject *j);
+static CYTHON_INLINE int __Pyx_DelItemInt_Fast(PyObject *o, Py_ssize_t i,
+                                               int is_list, int wraparound);
+
+/////////////// DelItemInt ///////////////
+
+static int __Pyx_DelItem_Generic(PyObject *o, PyObject *j) {
+    int r;
+    if (unlikely(!j)) return -1;
+    r = PyObject_DelItem(o, j);
+    Py_DECREF(j);
+    return r;
+}
+
+static CYTHON_INLINE int __Pyx_DelItemInt_Fast(PyObject *o, Py_ssize_t i,
+                                               int is_list, CYTHON_NCP_UNUSED int wraparound) {
+#if !CYTHON_USE_TYPE_SLOTS
+    // PySequence_DelItem behaves differently to PyObject_DelItem for i<0
+    // and possibly some other cases so can't generally be substituted
+    if (is_list || !PyMapping_Check(o)) {
+        return PySequence_DelItem(o, i);
+    }
+#else
+    // inlined PySequence_DelItem() + special cased length overflow
+    PyMappingMethods *mm = Py_TYPE(o)->tp_as_mapping;
+    PySequenceMethods *sm = Py_TYPE(o)->tp_as_sequence;
+    if ((!is_list) && mm && mm->mp_ass_subscript) {
+        PyObject *key = PyInt_FromSsize_t(i);
+        return likely(key) ? mm->mp_ass_subscript(o, key, (PyObject *)NULL) : -1;
+    }
+    if (likely(sm && sm->sq_ass_item)) {
+        if (wraparound && unlikely(i < 0) && likely(sm->sq_length)) {
+            Py_ssize_t l = sm->sq_length(o);
+            if (likely(l >= 0)) {
+                i += l;
+            } else {
+                // if length > max(Py_ssize_t), maybe the object can wrap around itself?
+                if (!PyErr_ExceptionMatches(PyExc_OverflowError))
+                    return -1;
+                PyErr_Clear();
+            }
+        }
+        return sm->sq_ass_item(o, i, (PyObject *)NULL);
+    }
+#endif
+    return __Pyx_DelItem_Generic(o, PyInt_FromSsize_t(i));
+}
+
+
+/////////////// SliceObject.proto ///////////////
+
+// we pass pointer addresses to show the C compiler what is NULL and what isn't
+{{if access == 'Get'}}
+static CYTHON_INLINE PyObject* __Pyx_PyObject_GetSlice(
+        PyObject* obj, Py_ssize_t cstart, Py_ssize_t cstop,
+        PyObject** py_start, PyObject** py_stop, PyObject** py_slice,
+        int has_cstart, int has_cstop, int wraparound);
+{{else}}
+#define __Pyx_PyObject_DelSlice(obj, cstart, cstop, py_start, py_stop, py_slice, has_cstart, has_cstop, wraparound) \
+    __Pyx_PyObject_SetSlice(obj, (PyObject*)NULL, cstart, cstop, py_start, py_stop, py_slice, has_cstart, has_cstop, wraparound)
+
+// we pass pointer addresses to show the C compiler what is NULL and what isn't
+static CYTHON_INLINE int __Pyx_PyObject_SetSlice(
+        PyObject* obj, PyObject* value, Py_ssize_t cstart, Py_ssize_t cstop,
+        PyObject** py_start, PyObject** py_stop, PyObject** py_slice,
+        int has_cstart, int has_cstop, int wraparound);
+{{endif}}
+
+/////////////// SliceObject ///////////////
+
+{{if access == 'Get'}}
+static CYTHON_INLINE PyObject* __Pyx_PyObject_GetSlice(PyObject* obj,
+{{else}}
+static CYTHON_INLINE int __Pyx_PyObject_SetSlice(PyObject* obj, PyObject* value,
+{{endif}}
+        Py_ssize_t cstart, Py_ssize_t cstop,
+        PyObject** _py_start, PyObject** _py_stop, PyObject** _py_slice,
+        int has_cstart, int has_cstop, int wraparound) {
+    __Pyx_TypeName obj_type_name;
+#if CYTHON_USE_TYPE_SLOTS
+    PyMappingMethods* mp;
+#if PY_MAJOR_VERSION < 3
+    PySequenceMethods* ms = Py_TYPE(obj)->tp_as_sequence;
+    if (likely(ms && ms->sq_{{if access == 'Set'}}ass_{{endif}}slice)) {
+        if (!has_cstart) {
+            if (_py_start && (*_py_start != Py_None)) {
+                cstart = __Pyx_PyIndex_AsSsize_t(*_py_start);
+                if ((cstart == (Py_ssize_t)-1) && PyErr_Occurred()) goto bad;
+            } else
+                cstart = 0;
+        }
+        if (!has_cstop) {
+            if (_py_stop && (*_py_stop != Py_None)) {
+                cstop = __Pyx_PyIndex_AsSsize_t(*_py_stop);
+                if ((cstop == (Py_ssize_t)-1) && PyErr_Occurred()) goto bad;
+            } else
+                cstop = PY_SSIZE_T_MAX;
+        }
+        if (wraparound && unlikely((cstart < 0) | (cstop < 0)) && likely(ms->sq_length)) {
+            Py_ssize_t l = ms->sq_length(obj);
+            if (likely(l >= 0)) {
+                if (cstop < 0) {
+                    cstop += l;
+                    if (cstop < 0) cstop = 0;
+                }
+                if (cstart < 0) {
+                    cstart += l;
+                    if (cstart < 0) cstart = 0;
+                }
+            } else {
+                // if length > max(Py_ssize_t), maybe the object can wrap around itself?
+                if (!PyErr_ExceptionMatches(PyExc_OverflowError))
+                    goto bad;
+                PyErr_Clear();
+            }
+        }
+{{if access == 'Get'}}
+        return ms->sq_slice(obj, cstart, cstop);
+{{else}}
+        return ms->sq_ass_slice(obj, cstart, cstop, value);
+{{endif}}
+    }
+#else
+    CYTHON_UNUSED_VAR(wraparound);
+#endif
+
+    mp = Py_TYPE(obj)->tp_as_mapping;
+{{if access == 'Get'}}
+    if (likely(mp && mp->mp_subscript))
+{{else}}
+    if (likely(mp && mp->mp_ass_subscript))
+{{endif}}
+#else
+    CYTHON_UNUSED_VAR(wraparound);
+#endif
+    {
+        {{if access == 'Get'}}PyObject*{{else}}int{{endif}} result;
+        PyObject *py_slice, *py_start, *py_stop;
+        if (_py_slice) {
+            py_slice = *_py_slice;
+        } else {
+            PyObject* owned_start = NULL;
+            PyObject* owned_stop = NULL;
+            if (_py_start) {
+                py_start = *_py_start;
+            } else {
+                if (has_cstart) {
+                    owned_start = py_start = PyInt_FromSsize_t(cstart);
+                    if (unlikely(!py_start)) goto bad;
+                } else
+                    py_start = Py_None;
+            }
+            if (_py_stop) {
+                py_stop = *_py_stop;
+            } else {
+                if (has_cstop) {
+                    owned_stop = py_stop = PyInt_FromSsize_t(cstop);
+                    if (unlikely(!py_stop)) {
+                        Py_XDECREF(owned_start);
+                        goto bad;
+                    }
+                } else
+                    py_stop = Py_None;
+            }
+            py_slice = PySlice_New(py_start, py_stop, Py_None);
+            Py_XDECREF(owned_start);
+            Py_XDECREF(owned_stop);
+            if (unlikely(!py_slice)) goto bad;
+        }
+#if CYTHON_USE_TYPE_SLOTS
+{{if access == 'Get'}}
+        result = mp->mp_subscript(obj, py_slice);
+#else
+        result = PyObject_GetItem(obj, py_slice);
+{{else}}
+        result = mp->mp_ass_subscript(obj, py_slice, value);
+#else
+        result = value ? PyObject_SetItem(obj, py_slice, value) : PyObject_DelItem(obj, py_slice);
+{{endif}}
+#endif
+        if (!_py_slice) {
+            Py_DECREF(py_slice);
+        }
+        return result;
+    }
+    obj_type_name = __Pyx_PyType_GetName(Py_TYPE(obj));
+    PyErr_Format(PyExc_TypeError,
+{{if access == 'Get'}}
+        "'" __Pyx_FMT_TYPENAME "' object is unsliceable", obj_type_name);
+{{else}}
+        "'" __Pyx_FMT_TYPENAME "' object does not support slice %.10s",
+        obj_type_name, value ? "assignment" : "deletion");
+{{endif}}
+    __Pyx_DECREF_TypeName(obj_type_name);
+
+bad:
+    return {{if access == 'Get'}}NULL{{else}}-1{{endif}};
+}
+
+
+/////////////// TupleAndListFromArray.proto ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE PyObject* __Pyx_PyList_FromArray(PyObject *const *src, Py_ssize_t n);
+static CYTHON_INLINE PyObject* __Pyx_PyTuple_FromArray(PyObject *const *src, Py_ssize_t n);
+#endif
+
+/////////////// TupleAndListFromArray ///////////////
+//@substitute: naming
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE void __Pyx_copy_object_array(PyObject *const *CYTHON_RESTRICT src, PyObject** CYTHON_RESTRICT dest, Py_ssize_t length) {
+    PyObject *v;
+    Py_ssize_t i;
+    for (i = 0; i < length; i++) {
+        v = dest[i] = src[i];
+        Py_INCREF(v);
+    }
+}
+
+static CYTHON_INLINE PyObject *
+__Pyx_PyTuple_FromArray(PyObject *const *src, Py_ssize_t n)
+{
+    PyObject *res;
+    if (n <= 0) {
+        Py_INCREF($empty_tuple);
+        return $empty_tuple;
+    }
+    res = PyTuple_New(n);
+    if (unlikely(res == NULL)) return NULL;
+    __Pyx_copy_object_array(src, ((PyTupleObject*)res)->ob_item, n);
+    return res;
+}
+
+static CYTHON_INLINE PyObject *
+__Pyx_PyList_FromArray(PyObject *const *src, Py_ssize_t n)
+{
+    PyObject *res;
+    if (n <= 0) {
+        return PyList_New(0);
+    }
+    res = PyList_New(n);
+    if (unlikely(res == NULL)) return NULL;
+    __Pyx_copy_object_array(src, ((PyListObject*)res)->ob_item, n);
+    return res;
+}
+#endif
+
+
+/////////////// SliceTupleAndList.proto ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE PyObject* __Pyx_PyList_GetSlice(PyObject* src, Py_ssize_t start, Py_ssize_t stop);
+static CYTHON_INLINE PyObject* __Pyx_PyTuple_GetSlice(PyObject* src, Py_ssize_t start, Py_ssize_t stop);
+#else
+#define __Pyx_PyList_GetSlice(seq, start, stop)   PySequence_GetSlice(seq, start, stop)
+#define __Pyx_PyTuple_GetSlice(seq, start, stop)  PySequence_GetSlice(seq, start, stop)
+#endif
+
+/////////////// SliceTupleAndList ///////////////
+//@requires: TupleAndListFromArray
+//@substitute: tempita
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE void __Pyx_crop_slice(Py_ssize_t* _start, Py_ssize_t* _stop, Py_ssize_t* _length) {
+    Py_ssize_t start = *_start, stop = *_stop, length = *_length;
+    if (start < 0) {
+        start += length;
+        if (start < 0)
+            start = 0;
+    }
+
+    if (stop < 0)
+        stop += length;
+    else if (stop > length)
+        stop = length;
+
+    *_length = stop - start;
+    *_start = start;
+    *_stop = stop;
+}
+
+{{for type in ['List', 'Tuple']}}
+static CYTHON_INLINE PyObject* __Pyx_Py{{type}}_GetSlice(
+            PyObject* src, Py_ssize_t start, Py_ssize_t stop) {
+    Py_ssize_t length = Py{{type}}_GET_SIZE(src);
+    __Pyx_crop_slice(&start, &stop, &length);
+{{if type=='List'}}
+    if (length <= 0) {
+        // Avoid undefined behaviour when accessing `ob_item` of an empty list.
+        return PyList_New(0);
+    }
+{{endif}}
+    return __Pyx_Py{{type}}_FromArray(((Py{{type}}Object*)src)->ob_item + start, length);
+}
+{{endfor}}
+#endif
+
+
+/////////////// CalculateMetaclass.proto ///////////////
+
+static PyObject *__Pyx_CalculateMetaclass(PyTypeObject *metaclass, PyObject *bases);
+
+/////////////// CalculateMetaclass ///////////////
+
+static PyObject *__Pyx_CalculateMetaclass(PyTypeObject *metaclass, PyObject *bases) {
+    Py_ssize_t i, nbases;
+#if CYTHON_ASSUME_SAFE_MACROS
+    nbases = PyTuple_GET_SIZE(bases);
+#else
+    nbases = PyTuple_Size(bases);
+    if (nbases < 0) return NULL;
+#endif
+    for (i=0; i < nbases; i++) {
+        PyTypeObject *tmptype;
+#if CYTHON_ASSUME_SAFE_MACROS
+        PyObject *tmp = PyTuple_GET_ITEM(bases, i);
+#else
+        PyObject *tmp = PyTuple_GetItem(bases, i);
+        if (!tmp) return NULL;
+#endif
+        tmptype = Py_TYPE(tmp);
+#if PY_MAJOR_VERSION < 3
+        if (tmptype == &PyClass_Type)
+            continue;
+#endif
+        if (!metaclass) {
+            metaclass = tmptype;
+            continue;
+        }
+        if (PyType_IsSubtype(metaclass, tmptype))
+            continue;
+        if (PyType_IsSubtype(tmptype, metaclass)) {
+            metaclass = tmptype;
+            continue;
+        }
+        // else:
+        PyErr_SetString(PyExc_TypeError,
+                        "metaclass conflict: "
+                        "the metaclass of a derived class "
+                        "must be a (non-strict) subclass "
+                        "of the metaclasses of all its bases");
+        return NULL;
+    }
+    if (!metaclass) {
+#if PY_MAJOR_VERSION < 3
+        metaclass = &PyClass_Type;
+#else
+        metaclass = &PyType_Type;
+#endif
+    }
+    // make owned reference
+    Py_INCREF((PyObject*) metaclass);
+    return (PyObject*) metaclass;
+}
+
+
+/////////////// FindInheritedMetaclass.proto ///////////////
+
+static PyObject *__Pyx_FindInheritedMetaclass(PyObject *bases); /*proto*/
+
+/////////////// FindInheritedMetaclass ///////////////
+//@requires: PyObjectGetAttrStr
+//@requires: CalculateMetaclass
+
+static PyObject *__Pyx_FindInheritedMetaclass(PyObject *bases) {
+    PyObject *metaclass;
+    if (PyTuple_Check(bases) && PyTuple_GET_SIZE(bases) > 0) {
+        PyTypeObject *metatype;
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+        PyObject *base = PyTuple_GET_ITEM(bases, 0);
+#else
+        PyObject *base = PySequence_ITEM(bases, 0);
+#endif
+#if PY_MAJOR_VERSION < 3
+        PyObject* basetype = __Pyx_PyObject_GetAttrStr(base, PYIDENT("__class__"));
+        if (basetype) {
+            metatype = (PyType_Check(basetype)) ? ((PyTypeObject*) basetype) : NULL;
+        } else {
+            PyErr_Clear();
+            metatype = Py_TYPE(base);
+            basetype = (PyObject*) metatype;
+            Py_INCREF(basetype);
+        }
+#else
+        metatype = Py_TYPE(base);
+#endif
+        metaclass = __Pyx_CalculateMetaclass(metatype, bases);
+#if !(CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS)
+        Py_DECREF(base);
+#endif
+#if PY_MAJOR_VERSION < 3
+        Py_DECREF(basetype);
+#endif
+    } else {
+        // no bases => use default metaclass
+#if PY_MAJOR_VERSION < 3
+        metaclass = (PyObject *) &PyClass_Type;
+#else
+        metaclass = (PyObject *) &PyType_Type;
+#endif
+        Py_INCREF(metaclass);
+    }
+    return metaclass;
+}
+
+/////////////// Py3MetaclassGet.proto ///////////////
+
+static PyObject *__Pyx_Py3MetaclassGet(PyObject *bases, PyObject *mkw); /*proto*/
+
+/////////////// Py3MetaclassGet ///////////////
+//@requires: FindInheritedMetaclass
+//@requires: CalculateMetaclass
+
+static PyObject *__Pyx_Py3MetaclassGet(PyObject *bases, PyObject *mkw) {
+    PyObject *metaclass = mkw ? __Pyx_PyDict_GetItemStr(mkw, PYIDENT("metaclass")) : NULL;
+    if (metaclass) {
+        Py_INCREF(metaclass);
+        if (PyDict_DelItem(mkw, PYIDENT("metaclass")) < 0) {
+            Py_DECREF(metaclass);
+            return NULL;
+        }
+        if (PyType_Check(metaclass)) {
+            PyObject* orig = metaclass;
+            metaclass = __Pyx_CalculateMetaclass((PyTypeObject*) metaclass, bases);
+            Py_DECREF(orig);
+        }
+        return metaclass;
+    }
+    return __Pyx_FindInheritedMetaclass(bases);
+}
+
+/////////////// CreateClass.proto ///////////////
+
+static PyObject *__Pyx_CreateClass(PyObject *bases, PyObject *dict, PyObject *name,
+                                   PyObject *qualname, PyObject *modname); /*proto*/
+
+/////////////// CreateClass ///////////////
+//@requires: FindInheritedMetaclass
+//@requires: CalculateMetaclass
+
+static PyObject *__Pyx_CreateClass(PyObject *bases, PyObject *dict, PyObject *name,
+                                   PyObject *qualname, PyObject *modname) {
+    PyObject *result;
+    PyObject *metaclass;
+
+    if (unlikely(PyDict_SetItem(dict, PYIDENT("__module__"), modname) < 0))
+        return NULL;
+#if PY_VERSION_HEX >= 0x03030000
+    if (unlikely(PyDict_SetItem(dict, PYIDENT("__qualname__"), qualname) < 0))
+        return NULL;
+#else
+    CYTHON_MAYBE_UNUSED_VAR(qualname);
+#endif
+
+    /* Python2 __metaclass__ */
+    metaclass = __Pyx_PyDict_GetItemStr(dict, PYIDENT("__metaclass__"));
+    if (metaclass) {
+        Py_INCREF(metaclass);
+        if (PyType_Check(metaclass)) {
+            PyObject* orig = metaclass;
+            metaclass = __Pyx_CalculateMetaclass((PyTypeObject*) metaclass, bases);
+            Py_DECREF(orig);
+        }
+    } else {
+        metaclass = __Pyx_FindInheritedMetaclass(bases);
+    }
+    if (unlikely(!metaclass))
+        return NULL;
+    result = PyObject_CallFunctionObjArgs(metaclass, name, bases, dict, NULL);
+    Py_DECREF(metaclass);
+    return result;
+}
+
+/////////////// Py3UpdateBases.proto ///////////////
+
+static PyObject* __Pyx_PEP560_update_bases(PyObject *bases); /* proto */
+
+/////////////// Py3UpdateBases /////////////////////
+//@requires: PyObjectCallOneArg
+//@requires: PyObjectGetAttrStrNoError
+
+/* Shamelessly adapted from cpython/bltinmodule.c update_bases */
+static PyObject*
+__Pyx_PEP560_update_bases(PyObject *bases)
+{
+    Py_ssize_t i, j, size_bases;
+    PyObject *base, *meth, *new_base, *result, *new_bases = NULL;
+    /*assert(PyTuple_Check(bases));*/
+
+    size_bases = PyTuple_GET_SIZE(bases);
+    for (i = 0; i < size_bases; i++) {
+        // original code in CPython: base  = args[i];
+        base  = PyTuple_GET_ITEM(bases, i);
+        if (PyType_Check(base)) {
+            if (new_bases) {
+                // If we already have made a replacement, then we append every normal base,
+                // otherwise just skip it.
+                if (PyList_Append(new_bases, base) < 0) {
+                    goto error;
+                }
+            }
+            continue;
+        }
+        // original code in CPython:
+        // if (_PyObject_LookupAttrId(base, &PyId___mro_entries__, &meth) < 0) {
+        meth = __Pyx_PyObject_GetAttrStrNoError(base, PYIDENT("__mro_entries__"));
+        if (!meth && PyErr_Occurred()) {
+            goto error;
+        }
+        if (!meth) {
+            if (new_bases) {
+                if (PyList_Append(new_bases, base) < 0) {
+                    goto error;
+                }
+            }
+            continue;
+        }
+        new_base = __Pyx_PyObject_CallOneArg(meth, bases);
+        Py_DECREF(meth);
+        if (!new_base) {
+            goto error;
+        }
+        if (!PyTuple_Check(new_base)) {
+            PyErr_SetString(PyExc_TypeError,
+                            "__mro_entries__ must return a tuple");
+            Py_DECREF(new_base);
+            goto error;
+        }
+        if (!new_bases) {
+            // If this is a first successful replacement, create new_bases list and
+            // copy previously encountered bases.
+            if (!(new_bases = PyList_New(i))) {
+                goto error;
+            }
+            for (j = 0; j < i; j++) {
+                // original code in CPython: base = args[j];
+                base = PyTuple_GET_ITEM(bases, j);
+                PyList_SET_ITEM(new_bases, j, base);
+                Py_INCREF(base);
+            }
+        }
+        j = PyList_GET_SIZE(new_bases);
+        if (PyList_SetSlice(new_bases, j, j, new_base) < 0) {
+            goto error;
+        }
+        Py_DECREF(new_base);
+    }
+    if (!new_bases) {
+        // unlike the CPython implementation, always return a new reference
+        Py_INCREF(bases);
+        return bases;
+    }
+    result = PyList_AsTuple(new_bases);
+    Py_DECREF(new_bases);
+    return result;
+
+error:
+    Py_XDECREF(new_bases);
+    return NULL;
+}
+
+/////////////// Py3ClassCreate.proto ///////////////
+
+static PyObject *__Pyx_Py3MetaclassPrepare(PyObject *metaclass, PyObject *bases, PyObject *name, PyObject *qualname,
+                                           PyObject *mkw, PyObject *modname, PyObject *doc); /*proto*/
+static PyObject *__Pyx_Py3ClassCreate(PyObject *metaclass, PyObject *name, PyObject *bases, PyObject *dict,
+                                      PyObject *mkw, int calculate_metaclass, int allow_py2_metaclass); /*proto*/
+
+/////////////// Py3ClassCreate ///////////////
+//@substitute: naming
+//@requires: PyObjectGetAttrStrNoError
+//@requires: CalculateMetaclass
+//@requires: PyObjectFastCall
+//@requires: PyObjectCall2Args
+//@requires: PyObjectLookupSpecial
+// only in fallback code:
+//@requires: GetBuiltinName
+
+static PyObject *__Pyx_Py3MetaclassPrepare(PyObject *metaclass, PyObject *bases, PyObject *name,
+                                           PyObject *qualname, PyObject *mkw, PyObject *modname, PyObject *doc) {
+    PyObject *ns;
+    if (metaclass) {
+        PyObject *prep = __Pyx_PyObject_GetAttrStrNoError(metaclass, PYIDENT("__prepare__"));
+        if (prep) {
+            PyObject *pargs[3] = {NULL, name, bases};
+            ns = __Pyx_PyObject_FastCallDict(prep, pargs+1, 2 | __Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET, mkw);
+            Py_DECREF(prep);
+        } else {
+            if (unlikely(PyErr_Occurred()))
+                return NULL;
+            ns = PyDict_New();
+        }
+    } else {
+        ns = PyDict_New();
+    }
+
+    if (unlikely(!ns))
+        return NULL;
+
+    /* Required here to emulate assignment order */
+    if (unlikely(PyObject_SetItem(ns, PYIDENT("__module__"), modname) < 0)) goto bad;
+#if PY_VERSION_HEX >= 0x03030000
+    if (unlikely(PyObject_SetItem(ns, PYIDENT("__qualname__"), qualname) < 0)) goto bad;
+#else
+    CYTHON_MAYBE_UNUSED_VAR(qualname);
+#endif
+    if (unlikely(doc && PyObject_SetItem(ns, PYIDENT("__doc__"), doc) < 0)) goto bad;
+    return ns;
+bad:
+    Py_DECREF(ns);
+    return NULL;
+}
+
+#if PY_VERSION_HEX < 0x030600A4 && CYTHON_PEP487_INIT_SUBCLASS
+// https://www.python.org/dev/peps/pep-0487/
+static int __Pyx_SetNamesPEP487(PyObject *type_obj) {
+    PyTypeObject *type = (PyTypeObject*) type_obj;
+    PyObject *names_to_set, *key, *value, *set_name, *tmp;
+    Py_ssize_t i = 0;
+
+#if CYTHON_USE_TYPE_SLOTS
+    names_to_set = PyDict_Copy(type->tp_dict);
+#else
+    {
+        PyObject *d = PyObject_GetAttr(type_obj, PYIDENT("__dict__"));
+        names_to_set = NULL;
+        if (likely(d)) {
+            // d may not be a dict, e.g. PyDictProxy in PyPy2.
+            PyObject *names_to_set = PyDict_New();
+            int ret = likely(names_to_set) ? PyDict_Update(names_to_set, d) : -1;
+            Py_DECREF(d);
+            if (unlikely(ret < 0))
+                Py_CLEAR(names_to_set);
+        }
+    }
+#endif
+    if (unlikely(names_to_set == NULL))
+        goto bad;
+
+    while (PyDict_Next(names_to_set, &i, &key, &value)) {
+        set_name = __Pyx_PyObject_LookupSpecialNoError(value, PYIDENT("__set_name__"));
+        if (unlikely(set_name != NULL)) {
+            tmp = __Pyx_PyObject_Call2Args(set_name, type_obj, key);
+            Py_DECREF(set_name);
+            if (unlikely(tmp == NULL)) {
+                __Pyx_TypeName value_type_name =
+                    __Pyx_PyType_GetName(Py_TYPE(value));
+                __Pyx_TypeName type_name = __Pyx_PyType_GetName(type);
+                PyErr_Format(PyExc_RuntimeError,
+#if PY_MAJOR_VERSION >= 3
+                    "Error calling __set_name__ on '" __Pyx_FMT_TYPENAME "' instance %R " "in '" __Pyx_FMT_TYPENAME "'",
+                    value_type_name, key, type_name);
+#else
+                    "Error calling __set_name__ on '" __Pyx_FMT_TYPENAME "' instance %.100s in '" __Pyx_FMT_TYPENAME "'",
+                    value_type_name,
+                    PyString_Check(key) ? PyString_AS_STRING(key) : "?",
+                    type_name);
+#endif
+                goto bad;
+            } else {
+                Py_DECREF(tmp);
+            }
+        }
+        else if (unlikely(PyErr_Occurred())) {
+            goto bad;
+        }
+    }
+
+    Py_DECREF(names_to_set);
+    return 0;
+bad:
+    Py_XDECREF(names_to_set);
+    return -1;
+}
+
+static PyObject *__Pyx_InitSubclassPEP487(PyObject *type_obj, PyObject *mkw) {
+#if CYTHON_USE_TYPE_SLOTS && CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+// Stripped-down version of "super(type_obj, type_obj).__init_subclass__(**mkw)" in CPython 3.8.
+    PyTypeObject *type = (PyTypeObject*) type_obj;
+    PyObject *mro = type->tp_mro;
+    Py_ssize_t i, nbases;
+    if (unlikely(!mro)) goto done;
+
+    // avoid "unused" warning
+    (void) &__Pyx_GetBuiltinName;
+
+    Py_INCREF(mro);
+    nbases = PyTuple_GET_SIZE(mro);
+
+    // Skip over the type itself and 'object'.
+    assert(PyTuple_GET_ITEM(mro, 0) == type_obj);
+    for (i = 1; i < nbases-1; i++) {
+        PyObject *base, *dict, *meth;
+        base = PyTuple_GET_ITEM(mro, i);
+        dict = ((PyTypeObject *)base)->tp_dict;
+        meth = __Pyx_PyDict_GetItemStrWithError(dict, PYIDENT("__init_subclass__"));
+        if (unlikely(meth)) {
+            descrgetfunc f = Py_TYPE(meth)->tp_descr_get;
+            PyObject *res;
+            Py_INCREF(meth);
+            if (likely(f)) {
+                res = f(meth, NULL, type_obj);
+                Py_DECREF(meth);
+                if (unlikely(!res)) goto bad;
+                meth = res;
+            }
+            res = __Pyx_PyObject_FastCallDict(meth, NULL, 0, mkw);
+            Py_DECREF(meth);
+            if (unlikely(!res)) goto bad;
+            Py_DECREF(res);
+            goto done;
+        } else if (unlikely(PyErr_Occurred())) {
+            goto bad;
+        }
+    }
+
+done:
+    Py_XDECREF(mro);
+    return type_obj;
+
+bad:
+    Py_XDECREF(mro);
+    Py_DECREF(type_obj);
+    return NULL;
+
+// CYTHON_USE_TYPE_SLOTS && CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+#else
+// Generic fallback: "super(type_obj, type_obj).__init_subclass__(**mkw)", as used in CPython 3.8.
+    PyObject *super_type, *super, *func, *res;
+
+#if CYTHON_COMPILING_IN_PYPY && !defined(PySuper_Type)
+    super_type = __Pyx_GetBuiltinName(PYIDENT("super"));
+#else
+    super_type = (PyObject*) &PySuper_Type;
+    // avoid "unused" warning
+    (void) &__Pyx_GetBuiltinName;
+#endif
+    super = likely(super_type) ? __Pyx_PyObject_Call2Args(super_type, type_obj, type_obj) : NULL;
+#if CYTHON_COMPILING_IN_PYPY && !defined(PySuper_Type)
+    Py_XDECREF(super_type);
+#endif
+    if (unlikely(!super)) {
+        Py_CLEAR(type_obj);
+        goto done;
+    }
+    func = __Pyx_PyObject_GetAttrStrNoError(super, PYIDENT("__init_subclass__"));
+    Py_DECREF(super);
+    if (likely(!func)) {
+        if (unlikely(PyErr_Occurred()))
+            Py_CLEAR(type_obj);
+        goto done;
+    }
+    res = __Pyx_PyObject_FastCallDict(func, NULL, 0, mkw);
+    Py_DECREF(func);
+    if (unlikely(!res))
+        Py_CLEAR(type_obj);
+    Py_XDECREF(res);
+done:
+    return type_obj;
+#endif
+}
+
+// PY_VERSION_HEX < 0x030600A4 && CYTHON_PEP487_INIT_SUBCLASS
+#endif
+
+static PyObject *__Pyx_Py3ClassCreate(PyObject *metaclass, PyObject *name, PyObject *bases,
+                                      PyObject *dict, PyObject *mkw,
+                                      int calculate_metaclass, int allow_py2_metaclass) {
+    PyObject *result;
+    PyObject *owned_metaclass = NULL;
+    PyObject *margs[4] = {NULL, name, bases, dict};
+    if (allow_py2_metaclass) {
+        /* honour Python2 __metaclass__ for backward compatibility */
+        owned_metaclass = PyObject_GetItem(dict, PYIDENT("__metaclass__"));
+        if (owned_metaclass) {
+            metaclass = owned_metaclass;
+        } else if (likely(PyErr_ExceptionMatches(PyExc_KeyError))) {
+            PyErr_Clear();
+        } else {
+            return NULL;
+        }
+    }
+    if (calculate_metaclass && (!metaclass || PyType_Check(metaclass))) {
+        metaclass = __Pyx_CalculateMetaclass((PyTypeObject*) metaclass, bases);
+        Py_XDECREF(owned_metaclass);
+        if (unlikely(!metaclass))
+            return NULL;
+        owned_metaclass = metaclass;
+    }
+    result = __Pyx_PyObject_FastCallDict(metaclass, margs+1, 3 | __Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET,
+#if PY_VERSION_HEX < 0x030600A4
+        // Before PEP-487, type(a,b,c) did not accept any keyword arguments, so guard at least against that case.
+        (metaclass == (PyObject*)&PyType_Type) ? NULL : mkw
+#else
+        mkw
+#endif
+    );
+    Py_XDECREF(owned_metaclass);
+
+#if PY_VERSION_HEX < 0x030600A4 && CYTHON_PEP487_INIT_SUBCLASS
+    if (likely(result) && likely(PyType_Check(result))) {
+        if (unlikely(__Pyx_SetNamesPEP487(result) < 0)) {
+            Py_CLEAR(result);
+        } else {
+            result = __Pyx_InitSubclassPEP487(result, mkw);
+        }
+    }
+#else
+    // avoid "unused" warning
+    (void) &__Pyx_GetBuiltinName;
+#endif
+    return result;
+}
+
+/////////////// ExtTypeTest.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type); /*proto*/
+
+/////////////// ExtTypeTest ///////////////
+
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
+    __Pyx_TypeName obj_type_name;
+    __Pyx_TypeName type_name;
+    if (unlikely(!type)) {
+        PyErr_SetString(PyExc_SystemError, "Missing type object");
+        return 0;
+    }
+    if (likely(__Pyx_TypeCheck(obj, type)))
+        return 1;
+    obj_type_name = __Pyx_PyType_GetName(Py_TYPE(obj));
+    type_name = __Pyx_PyType_GetName(type);
+    PyErr_Format(PyExc_TypeError,
+                 "Cannot convert " __Pyx_FMT_TYPENAME " to " __Pyx_FMT_TYPENAME,
+                 obj_type_name, type_name);
+    __Pyx_DECREF_TypeName(obj_type_name);
+    __Pyx_DECREF_TypeName(type_name);
+    return 0;
+}
+
+/////////////// CallableCheck.proto ///////////////
+
+#if CYTHON_USE_TYPE_SLOTS && PY_MAJOR_VERSION >= 3
+#define __Pyx_PyCallable_Check(obj)   (Py_TYPE(obj)->tp_call != NULL)
+#else
+#define __Pyx_PyCallable_Check(obj)   PyCallable_Check(obj)
+#endif
+
+/////////////// PyDictContains.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_PyDict_ContainsTF(PyObject* item, PyObject* dict, int eq) {
+    int result = PyDict_Contains(dict, item);
+    return unlikely(result < 0) ? result : (result == (eq == Py_EQ));
+}
+
+/////////////// PySetContains.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_PySet_ContainsTF(PyObject* key, PyObject* set, int eq); /* proto */
+
+/////////////// PySetContains ///////////////
+//@requires: Builtins.c::pyfrozenset_new
+
+static int __Pyx_PySet_ContainsUnhashable(PyObject *set, PyObject *key) {
+    int result = -1;
+    if (PySet_Check(key) && PyErr_ExceptionMatches(PyExc_TypeError)) {
+        /* Convert key to frozenset */
+        PyObject *tmpkey;
+        PyErr_Clear();
+        tmpkey = __Pyx_PyFrozenSet_New(key);
+        if (tmpkey != NULL) {
+            result = PySet_Contains(set, tmpkey);
+            Py_DECREF(tmpkey);
+        }
+    }
+    return result;
+}
+
+static CYTHON_INLINE int __Pyx_PySet_ContainsTF(PyObject* key, PyObject* set, int eq) {
+    int result = PySet_Contains(set, key);
+
+    if (unlikely(result < 0)) {
+        result = __Pyx_PySet_ContainsUnhashable(set, key);
+    }
+    return unlikely(result < 0) ? result : (result == (eq == Py_EQ));
+}
+
+/////////////// PySequenceContains.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_PySequence_ContainsTF(PyObject* item, PyObject* seq, int eq) {
+    int result = PySequence_Contains(seq, item);
+    return unlikely(result < 0) ? result : (result == (eq == Py_EQ));
+}
+
+/////////////// PyBoolOrNullFromLong.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyBoolOrNull_FromLong(long b) {
+    return unlikely(b < 0) ? NULL : __Pyx_PyBool_FromLong(b);
+}
+
+/////////////// GetBuiltinName.proto ///////////////
+
+static PyObject *__Pyx_GetBuiltinName(PyObject *name); /*proto*/
+
+/////////////// GetBuiltinName ///////////////
+//@requires: PyObjectGetAttrStrNoError
+//@substitute: naming
+
+static PyObject *__Pyx_GetBuiltinName(PyObject *name) {
+    PyObject* result = __Pyx_PyObject_GetAttrStrNoError($builtins_cname, name);
+    if (unlikely(!result) && !PyErr_Occurred()) {
+        PyErr_Format(PyExc_NameError,
+#if PY_MAJOR_VERSION >= 3
+            "name '%U' is not defined", name);
+#else
+            "name '%.200s' is not defined", PyString_AS_STRING(name));
+#endif
+    }
+    return result;
+}
+
+/////////////// GetNameInClass.proto ///////////////
+
+#define __Pyx_GetNameInClass(var, nmspace, name)  (var) = __Pyx__GetNameInClass(nmspace, name)
+static PyObject *__Pyx__GetNameInClass(PyObject *nmspace, PyObject *name); /*proto*/
+
+/////////////// GetNameInClass ///////////////
+//@requires: GetModuleGlobalName
+
+static PyObject *__Pyx__GetNameInClass(PyObject *nmspace, PyObject *name) {
+    PyObject *result;
+    PyObject *dict;
+    assert(PyType_Check(nmspace));
+#if CYTHON_USE_TYPE_SLOTS
+    dict = ((PyTypeObject*)nmspace)->tp_dict;
+    Py_XINCREF(dict);
+#else
+    dict = PyObject_GetAttr(nmspace, PYIDENT("__dict__"));
+#endif
+    if (likely(dict)) {
+        result = PyObject_GetItem(dict, name);
+        Py_DECREF(dict);
+        if (result) {
+            return result;
+        }
+    }
+    PyErr_Clear();
+    __Pyx_GetModuleGlobalNameUncached(result, name);
+    return result;
+}
+
+
+/////////////// SetNameInClass.proto ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030500A1 && PY_VERSION_HEX < 0x030d0000
+// Identifier names are always interned and have a pre-calculated hash value.
+#define __Pyx_SetNameInClass(ns, name, value) \
+    (likely(PyDict_CheckExact(ns)) ? _PyDict_SetItem_KnownHash(ns, name, value, ((PyASCIIObject *) name)->hash) : PyObject_SetItem(ns, name, value))
+#elif CYTHON_COMPILING_IN_CPYTHON
+#define __Pyx_SetNameInClass(ns, name, value) \
+    (likely(PyDict_CheckExact(ns)) ? PyDict_SetItem(ns, name, value) : PyObject_SetItem(ns, name, value))
+#else
+#define __Pyx_SetNameInClass(ns, name, value)  PyObject_SetItem(ns, name, value)
+#endif
+
+/////////////// SetNewInClass.proto ///////////////
+
+static int __Pyx_SetNewInClass(PyObject *ns, PyObject *name, PyObject *value);
+
+/////////////// SetNewInClass ///////////////
+//@requires: SetNameInClass
+
+// Special-case setting __new__: if it's a Cython function, wrap it in a
+// staticmethod. This is similar to what Python does for a Python function
+// called __new__.
+static int __Pyx_SetNewInClass(PyObject *ns, PyObject *name, PyObject *value) {
+#ifdef __Pyx_CyFunction_USED
+    int ret;
+    if (__Pyx_CyFunction_Check(value)) {
+        PyObject *staticnew = PyStaticMethod_New(value);
+        if (unlikely(!staticnew)) return -1;
+        ret = __Pyx_SetNameInClass(ns, name, staticnew);
+        Py_DECREF(staticnew);
+        return ret;
+    }
+#endif
+    return __Pyx_SetNameInClass(ns, name, value);
+}
+
+
+/////////////// GetModuleGlobalName.proto ///////////////
+//@requires: PyDictVersioning
+//@substitute: naming
+
+#if CYTHON_USE_DICT_VERSIONS
+#define __Pyx_GetModuleGlobalName(var, name)  do { \
+    static PY_UINT64_T __pyx_dict_version = 0; \
+    static PyObject *__pyx_dict_cached_value = NULL; \
+    (var) = (likely(__pyx_dict_version == __PYX_GET_DICT_VERSION($moddict_cname))) ? \
+        (likely(__pyx_dict_cached_value) ? __Pyx_NewRef(__pyx_dict_cached_value) : __Pyx_GetBuiltinName(name)) : \
+        __Pyx__GetModuleGlobalName(name, &__pyx_dict_version, &__pyx_dict_cached_value); \
+} while(0)
+#define __Pyx_GetModuleGlobalNameUncached(var, name)  do { \
+    PY_UINT64_T __pyx_dict_version; \
+    PyObject *__pyx_dict_cached_value; \
+    (var) = __Pyx__GetModuleGlobalName(name, &__pyx_dict_version, &__pyx_dict_cached_value); \
+} while(0)
+static PyObject *__Pyx__GetModuleGlobalName(PyObject *name, PY_UINT64_T *dict_version, PyObject **dict_cached_value); /*proto*/
+#else
+#define __Pyx_GetModuleGlobalName(var, name)  (var) = __Pyx__GetModuleGlobalName(name)
+#define __Pyx_GetModuleGlobalNameUncached(var, name)  (var) = __Pyx__GetModuleGlobalName(name)
+static CYTHON_INLINE PyObject *__Pyx__GetModuleGlobalName(PyObject *name); /*proto*/
+#endif
+
+
+/////////////// GetModuleGlobalName ///////////////
+//@requires: GetBuiltinName
+//@substitute: naming
+
+#if CYTHON_USE_DICT_VERSIONS
+static PyObject *__Pyx__GetModuleGlobalName(PyObject *name, PY_UINT64_T *dict_version, PyObject **dict_cached_value)
+#else
+static CYTHON_INLINE PyObject *__Pyx__GetModuleGlobalName(PyObject *name)
+#endif
+{
+    PyObject *result;
+// FIXME: clean up the macro guard order here: limited API first, then borrowed refs, then cpython
+#if !CYTHON_AVOID_BORROWED_REFS
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030500A1 && PY_VERSION_HEX < 0x030d0000
+    // Identifier names are always interned and have a pre-calculated hash value.
+    result = _PyDict_GetItem_KnownHash($moddict_cname, name, ((PyASCIIObject *) name)->hash);
+    __PYX_UPDATE_DICT_CACHE($moddict_cname, result, *dict_cached_value, *dict_version)
+    if (likely(result)) {
+        return __Pyx_NewRef(result);
+    } else if (unlikely(PyErr_Occurred())) {
+        return NULL;
+    }
+#elif CYTHON_COMPILING_IN_LIMITED_API
+    if (unlikely(!$module_cname)) {
+        return NULL;
+    }
+    result = PyObject_GetAttr($module_cname, name);
+    if (likely(result)) {
+        return result;
+    }
+#else
+    result = PyDict_GetItem($moddict_cname, name);
+    __PYX_UPDATE_DICT_CACHE($moddict_cname, result, *dict_cached_value, *dict_version)
+    if (likely(result)) {
+        return __Pyx_NewRef(result);
+    }
+#endif
+#else
+    result = PyObject_GetItem($moddict_cname, name);
+    __PYX_UPDATE_DICT_CACHE($moddict_cname, result, *dict_cached_value, *dict_version)
+    if (likely(result)) {
+        return __Pyx_NewRef(result);
+    }
+    PyErr_Clear();
+#endif
+    return __Pyx_GetBuiltinName(name);
+}
+
+//////////////////// GetAttr.proto ////////////////////
+
+static CYTHON_INLINE PyObject *__Pyx_GetAttr(PyObject *, PyObject *); /*proto*/
+
+//////////////////// GetAttr ////////////////////
+//@requires: PyObjectGetAttrStr
+
+static CYTHON_INLINE PyObject *__Pyx_GetAttr(PyObject *o, PyObject *n) {
+#if CYTHON_USE_TYPE_SLOTS
+#if PY_MAJOR_VERSION >= 3
+    if (likely(PyUnicode_Check(n)))
+#else
+    if (likely(PyString_Check(n)))
+#endif
+        return __Pyx_PyObject_GetAttrStr(o, n);
+#endif
+    return PyObject_GetAttr(o, n);
+}
+
+
+/////////////// PyObjectLookupSpecial.proto ///////////////
+
+#if CYTHON_USE_PYTYPE_LOOKUP && CYTHON_USE_TYPE_SLOTS
+#define __Pyx_PyObject_LookupSpecialNoError(obj, attr_name)  __Pyx__PyObject_LookupSpecial(obj, attr_name, 0)
+#define __Pyx_PyObject_LookupSpecial(obj, attr_name)  __Pyx__PyObject_LookupSpecial(obj, attr_name, 1)
+
+static CYTHON_INLINE PyObject* __Pyx__PyObject_LookupSpecial(PyObject* obj, PyObject* attr_name, int with_error); /*proto*/
+
+#else
+#define __Pyx_PyObject_LookupSpecialNoError(o,n) __Pyx_PyObject_GetAttrStrNoError(o,n)
+#define __Pyx_PyObject_LookupSpecial(o,n) __Pyx_PyObject_GetAttrStr(o,n)
+#endif
+
+/////////////// PyObjectLookupSpecial ///////////////
+//@requires: PyObjectGetAttrStr
+//@requires: PyObjectGetAttrStrNoError
+
+#if CYTHON_USE_PYTYPE_LOOKUP && CYTHON_USE_TYPE_SLOTS
+static CYTHON_INLINE PyObject* __Pyx__PyObject_LookupSpecial(PyObject* obj, PyObject* attr_name, int with_error) {
+    PyObject *res;
+    PyTypeObject *tp = Py_TYPE(obj);
+#if PY_MAJOR_VERSION < 3
+    if (unlikely(PyInstance_Check(obj)))
+        return with_error ? __Pyx_PyObject_GetAttrStr(obj, attr_name) : __Pyx_PyObject_GetAttrStrNoError(obj, attr_name);
+#endif
+    // adapted from CPython's special_lookup() in ceval.c
+    res = _PyType_Lookup(tp, attr_name);
+    if (likely(res)) {
+        descrgetfunc f = Py_TYPE(res)->tp_descr_get;
+        if (!f) {
+            Py_INCREF(res);
+        } else {
+            res = f(res, obj, (PyObject *)tp);
+        }
+    } else if (with_error) {
+        PyErr_SetObject(PyExc_AttributeError, attr_name);
+    }
+    return res;
+}
+#endif
+
+
+/////////////// PyObject_GenericGetAttrNoDict.proto ///////////////
+
+// Setting "tp_getattro" to anything but "PyObject_GenericGetAttr" disables fast method calls in Py3.7.
+#if CYTHON_USE_TYPE_SLOTS && CYTHON_USE_PYTYPE_LOOKUP && PY_VERSION_HEX < 0x03070000
+static CYTHON_INLINE PyObject* __Pyx_PyObject_GenericGetAttrNoDict(PyObject* obj, PyObject* attr_name);
+#else
+// No-args macro to allow function pointer assignment.
+#define __Pyx_PyObject_GenericGetAttrNoDict PyObject_GenericGetAttr
+#endif
+
+/////////////// PyObject_GenericGetAttrNoDict ///////////////
+
+#if CYTHON_USE_TYPE_SLOTS && CYTHON_USE_PYTYPE_LOOKUP && PY_VERSION_HEX < 0x03070000
+
+static PyObject *__Pyx_RaiseGenericGetAttributeError(PyTypeObject *tp, PyObject *attr_name) {
+    __Pyx_TypeName type_name = __Pyx_PyType_GetName(tp);
+    PyErr_Format(PyExc_AttributeError,
+#if PY_MAJOR_VERSION >= 3
+                 "'" __Pyx_FMT_TYPENAME "' object has no attribute '%U'",
+                 type_name, attr_name);
+#else
+                 "'" __Pyx_FMT_TYPENAME "' object has no attribute '%.400s'",
+                 type_name, PyString_AS_STRING(attr_name));
+#endif
+    __Pyx_DECREF_TypeName(type_name);
+    return NULL;
+}
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_GenericGetAttrNoDict(PyObject* obj, PyObject* attr_name) {
+    // Copied and adapted from _PyObject_GenericGetAttrWithDict() in CPython 3.6/3.7.
+    // To be used in the "tp_getattro" slot of extension types that have no instance dict and cannot be subclassed.
+    PyObject *descr;
+    PyTypeObject *tp = Py_TYPE(obj);
+
+    if (unlikely(!PyString_Check(attr_name))) {
+        return PyObject_GenericGetAttr(obj, attr_name);
+    }
+
+    assert(!tp->tp_dictoffset);
+    descr = _PyType_Lookup(tp, attr_name);
+    if (unlikely(!descr)) {
+        return __Pyx_RaiseGenericGetAttributeError(tp, attr_name);
+    }
+
+    Py_INCREF(descr);
+
+    #if PY_MAJOR_VERSION < 3
+    if (likely(PyType_HasFeature(Py_TYPE(descr), Py_TPFLAGS_HAVE_CLASS)))
+    #endif
+    {
+        descrgetfunc f = Py_TYPE(descr)->tp_descr_get;
+        // Optimise for the non-descriptor case because it is faster.
+        if (unlikely(f)) {
+            PyObject *res = f(descr, obj, (PyObject *)tp);
+            Py_DECREF(descr);
+            return res;
+        }
+    }
+    return descr;
+}
+#endif
+
+
+/////////////// PyObject_GenericGetAttr.proto ///////////////
+
+// Setting "tp_getattro" to anything but "PyObject_GenericGetAttr" disables fast method calls in Py3.7.
+#if CYTHON_USE_TYPE_SLOTS && CYTHON_USE_PYTYPE_LOOKUP && PY_VERSION_HEX < 0x03070000
+static PyObject* __Pyx_PyObject_GenericGetAttr(PyObject* obj, PyObject* attr_name);
+#else
+// No-args macro to allow function pointer assignment.
+#define __Pyx_PyObject_GenericGetAttr PyObject_GenericGetAttr
+#endif
+
+/////////////// PyObject_GenericGetAttr ///////////////
+//@requires: PyObject_GenericGetAttrNoDict
+
+#if CYTHON_USE_TYPE_SLOTS && CYTHON_USE_PYTYPE_LOOKUP && PY_VERSION_HEX < 0x03070000
+static PyObject* __Pyx_PyObject_GenericGetAttr(PyObject* obj, PyObject* attr_name) {
+    if (unlikely(Py_TYPE(obj)->tp_dictoffset)) {
+        return PyObject_GenericGetAttr(obj, attr_name);
+    }
+    return __Pyx_PyObject_GenericGetAttrNoDict(obj, attr_name);
+}
+#endif
+
+
+/////////////// PyObjectGetAttrStrNoError.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_GetAttrStrNoError(PyObject* obj, PyObject* attr_name);/*proto*/
+
+/////////////// PyObjectGetAttrStrNoError ///////////////
+//@requires: PyObjectGetAttrStr
+//@requires: Exceptions.c::PyThreadStateGet
+//@requires: Exceptions.c::PyErrFetchRestore
+//@requires: Exceptions.c::PyErrExceptionMatches
+
+#if __PYX_LIMITED_VERSION_HEX < 0x030d00A1
+static void __Pyx_PyObject_GetAttrStr_ClearAttributeError(void) {
+    __Pyx_PyThreadState_declare
+    __Pyx_PyThreadState_assign
+    if (likely(__Pyx_PyErr_ExceptionMatches(PyExc_AttributeError)))
+        __Pyx_PyErr_Clear();
+}
+#endif
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_GetAttrStrNoError(PyObject* obj, PyObject* attr_name) {
+    PyObject *result;
+#if __PYX_LIMITED_VERSION_HEX >= 0x030d00A1
+    (void) PyObject_GetOptionalAttr(obj, attr_name, &result);
+    return result;
+#else
+#if CYTHON_COMPILING_IN_CPYTHON && CYTHON_USE_TYPE_SLOTS && PY_VERSION_HEX >= 0x030700B1
+    // _PyObject_GenericGetAttrWithDict() in CPython 3.7+ can avoid raising the AttributeError.
+    // See https://bugs.python.org/issue32544
+    PyTypeObject* tp = Py_TYPE(obj);
+    if (likely(tp->tp_getattro == PyObject_GenericGetAttr)) {
+        return _PyObject_GenericGetAttrWithDict(obj, attr_name, NULL, 1);
+    }
+#endif
+    result = __Pyx_PyObject_GetAttrStr(obj, attr_name);
+    if (unlikely(!result)) {
+        __Pyx_PyObject_GetAttrStr_ClearAttributeError();
+    }
+    return result;
+#endif
+}
+
+
+/////////////// PyObjectGetAttrStr.proto ///////////////
+
+#if CYTHON_USE_TYPE_SLOTS
+static CYTHON_INLINE PyObject* __Pyx_PyObject_GetAttrStr(PyObject* obj, PyObject* attr_name);/*proto*/
+#else
+#define __Pyx_PyObject_GetAttrStr(o,n) PyObject_GetAttr(o,n)
+#endif
+
+/////////////// PyObjectGetAttrStr ///////////////
+
+#if CYTHON_USE_TYPE_SLOTS
+static CYTHON_INLINE PyObject* __Pyx_PyObject_GetAttrStr(PyObject* obj, PyObject* attr_name) {
+    PyTypeObject* tp = Py_TYPE(obj);
+    if (likely(tp->tp_getattro))
+        return tp->tp_getattro(obj, attr_name);
+#if PY_MAJOR_VERSION < 3
+    if (likely(tp->tp_getattr))
+        return tp->tp_getattr(obj, PyString_AS_STRING(attr_name));
+#endif
+    return PyObject_GetAttr(obj, attr_name);
+}
+#endif
+
+
+/////////////// PyObjectSetAttrStr.proto ///////////////
+
+#if CYTHON_USE_TYPE_SLOTS
+#define __Pyx_PyObject_DelAttrStr(o,n) __Pyx_PyObject_SetAttrStr(o, n, NULL)
+static CYTHON_INLINE int __Pyx_PyObject_SetAttrStr(PyObject* obj, PyObject* attr_name, PyObject* value);/*proto*/
+#else
+#define __Pyx_PyObject_DelAttrStr(o,n)   PyObject_DelAttr(o,n)
+#define __Pyx_PyObject_SetAttrStr(o,n,v) PyObject_SetAttr(o,n,v)
+#endif
+
+/////////////// PyObjectSetAttrStr ///////////////
+
+#if CYTHON_USE_TYPE_SLOTS
+static CYTHON_INLINE int __Pyx_PyObject_SetAttrStr(PyObject* obj, PyObject* attr_name, PyObject* value) {
+    PyTypeObject* tp = Py_TYPE(obj);
+    if (likely(tp->tp_setattro))
+        return tp->tp_setattro(obj, attr_name, value);
+#if PY_MAJOR_VERSION < 3
+    if (likely(tp->tp_setattr))
+        return tp->tp_setattr(obj, PyString_AS_STRING(attr_name), value);
+#endif
+    return PyObject_SetAttr(obj, attr_name, value);
+}
+#endif
+
+
+/////////////// PyObjectGetMethod.proto ///////////////
+
+static int __Pyx_PyObject_GetMethod(PyObject *obj, PyObject *name, PyObject **method);/*proto*/
+
+/////////////// PyObjectGetMethod ///////////////
+//@requires: PyObjectGetAttrStr
+
+static int __Pyx_PyObject_GetMethod(PyObject *obj, PyObject *name, PyObject **method) {
+    PyObject *attr;
+#if CYTHON_UNPACK_METHODS && CYTHON_COMPILING_IN_CPYTHON && CYTHON_USE_PYTYPE_LOOKUP
+    __Pyx_TypeName type_name;
+    // Copied from _PyObject_GetMethod() in CPython 3.7
+    PyTypeObject *tp = Py_TYPE(obj);
+    PyObject *descr;
+    descrgetfunc f = NULL;
+    PyObject **dictptr, *dict;
+    int meth_found = 0;
+
+    assert (*method == NULL);
+
+    if (unlikely(tp->tp_getattro != PyObject_GenericGetAttr)) {
+        attr = __Pyx_PyObject_GetAttrStr(obj, name);
+        goto try_unpack;
+    }
+    if (unlikely(tp->tp_dict == NULL) && unlikely(PyType_Ready(tp) < 0)) {
+        return 0;
+    }
+
+    descr = _PyType_Lookup(tp, name);
+    if (likely(descr != NULL)) {
+        Py_INCREF(descr);
+#if defined(Py_TPFLAGS_METHOD_DESCRIPTOR) && Py_TPFLAGS_METHOD_DESCRIPTOR
+        if (__Pyx_PyType_HasFeature(Py_TYPE(descr), Py_TPFLAGS_METHOD_DESCRIPTOR))
+#elif PY_MAJOR_VERSION >= 3
+        // Repeating the condition below accommodates for MSVC's inability to test macros inside of macro expansions.
+        #ifdef __Pyx_CyFunction_USED
+        if (likely(PyFunction_Check(descr) || __Pyx_IS_TYPE(descr, &PyMethodDescr_Type) || __Pyx_CyFunction_Check(descr)))
+        #else
+        if (likely(PyFunction_Check(descr) || __Pyx_IS_TYPE(descr, &PyMethodDescr_Type)))
+        #endif
+#else
+        // "PyMethodDescr_Type" is not part of the C-API in Py2.
+        #ifdef __Pyx_CyFunction_USED
+        if (likely(PyFunction_Check(descr) || __Pyx_CyFunction_Check(descr)))
+        #else
+        if (likely(PyFunction_Check(descr)))
+        #endif
+#endif
+        {
+            meth_found = 1;
+        } else {
+            f = Py_TYPE(descr)->tp_descr_get;
+            if (f != NULL && PyDescr_IsData(descr)) {
+                attr = f(descr, obj, (PyObject *)Py_TYPE(obj));
+                Py_DECREF(descr);
+                goto try_unpack;
+            }
+        }
+    }
+
+    dictptr = _PyObject_GetDictPtr(obj);
+    if (dictptr != NULL && (dict = *dictptr) != NULL) {
+        Py_INCREF(dict);
+        attr = __Pyx_PyDict_GetItemStr(dict, name);
+        if (attr != NULL) {
+            Py_INCREF(attr);
+            Py_DECREF(dict);
+            Py_XDECREF(descr);
+            goto try_unpack;
+        }
+        Py_DECREF(dict);
+    }
+
+    if (meth_found) {
+        *method = descr;
+        return 1;
+    }
+
+    if (f != NULL) {
+        attr = f(descr, obj, (PyObject *)Py_TYPE(obj));
+        Py_DECREF(descr);
+        goto try_unpack;
+    }
+
+    if (likely(descr != NULL)) {
+        *method = descr;
+        return 0;
+    }
+
+    type_name = __Pyx_PyType_GetName(tp);
+    PyErr_Format(PyExc_AttributeError,
+#if PY_MAJOR_VERSION >= 3
+                 "'" __Pyx_FMT_TYPENAME "' object has no attribute '%U'",
+                 type_name, name);
+#else
+                 "'" __Pyx_FMT_TYPENAME "' object has no attribute '%.400s'",
+                 type_name, PyString_AS_STRING(name));
+#endif
+    __Pyx_DECREF_TypeName(type_name);
+    return 0;
+
+// Generic fallback implementation using normal attribute lookup.
+#else
+    attr = __Pyx_PyObject_GetAttrStr(obj, name);
+    goto try_unpack;
+#endif
+
+try_unpack:
+#if CYTHON_UNPACK_METHODS
+    // Even if we failed to avoid creating a bound method object, it's still worth unpacking it now, if possible.
+    if (likely(attr) && PyMethod_Check(attr) && likely(PyMethod_GET_SELF(attr) == obj)) {
+        PyObject *function = PyMethod_GET_FUNCTION(attr);
+        Py_INCREF(function);
+        Py_DECREF(attr);
+        *method = function;
+        return 1;
+    }
+#endif
+    *method = attr;
+    return 0;
+}
+
+
+/////////////// UnpackUnboundCMethod.proto ///////////////
+
+typedef struct {
+    PyObject *type;
+    PyObject **method_name;
+    // "func" is set on first access (direct C function pointer)
+    PyCFunction func;
+    // "method" is set on first access (fallback)
+    PyObject *method;
+    int flag;
+} __Pyx_CachedCFunction;
+
+/////////////// UnpackUnboundCMethod ///////////////
+//@requires: PyObjectGetAttrStr
+
+static PyObject *__Pyx_SelflessCall(PyObject *method, PyObject *args, PyObject *kwargs) {
+    // NOTE: possible optimization - use vectorcall
+    PyObject *result;
+    PyObject *selfless_args = PyTuple_GetSlice(args, 1, PyTuple_Size(args));
+    if (unlikely(!selfless_args)) return NULL;
+
+    result = PyObject_Call(method, selfless_args, kwargs);
+    Py_DECREF(selfless_args);
+    return result;
+}
+
+static PyMethodDef __Pyx_UnboundCMethod_Def = {
+    /* .ml_name  = */ "CythonUnboundCMethod",
+    /* .ml_meth  = */ __PYX_REINTERPRET_FUNCION(PyCFunction, __Pyx_SelflessCall),
+    /* .ml_flags = */ METH_VARARGS | METH_KEYWORDS,
+    /* .ml_doc   = */ NULL
+};
+
+static int __Pyx_TryUnpackUnboundCMethod(__Pyx_CachedCFunction* target) {
+    PyObject *method;
+    method = __Pyx_PyObject_GetAttrStr(target->type, *target->method_name);
+    if (unlikely(!method))
+        return -1;
+    target->method = method;
+// FIXME: use functionality from CythonFunction.c/ClassMethod
+#if CYTHON_COMPILING_IN_CPYTHON
+    #if PY_MAJOR_VERSION >= 3
+    if (likely(__Pyx_TypeCheck(method, &PyMethodDescr_Type)))
+    #else
+    // method descriptor type isn't exported in Py2.x, cannot easily check the type there.
+    // Therefore, reverse the check to the most likely alternative
+    // (which is returned for class methods)
+    if (likely(!__Pyx_CyOrPyCFunction_Check(method)))
+    #endif
+    {
+        PyMethodDescrObject *descr = (PyMethodDescrObject*) method;
+        target->func = descr->d_method->ml_meth;
+        target->flag = descr->d_method->ml_flags & ~(METH_CLASS | METH_STATIC | METH_COEXIST | METH_STACKLESS);
+    } else
+#endif
+    // bound classmethods need special treatment
+#if CYTHON_COMPILING_IN_PYPY
+    // In PyPy, functions are regular methods, so just do the self check.
+#else
+    if (PyCFunction_Check(method))
+#endif
+    {
+        PyObject *self;
+        int self_found;
+#if CYTHON_COMPILING_IN_LIMITED_API || CYTHON_COMPILING_IN_PYPY
+        self = PyObject_GetAttrString(method, "__self__");
+        if (!self) {
+            PyErr_Clear();
+        }
+#else
+        self = PyCFunction_GET_SELF(method);
+#endif
+        self_found = (self && self != Py_None);
+#if CYTHON_COMPILING_IN_LIMITED_API || CYTHON_COMPILING_IN_PYPY
+        Py_XDECREF(self);
+#endif
+        if (self_found) {
+            PyObject *unbound_method = PyCFunction_New(&__Pyx_UnboundCMethod_Def, method);
+            if (unlikely(!unbound_method)) return -1;
+            // New PyCFunction will own method reference, thus decref __Pyx_PyObject_GetAttrStr
+            Py_DECREF(method);
+            target->method = unbound_method;
+        }
+    }
+    return 0;
+}
+
+
+/////////////// CallUnboundCMethod0.proto ///////////////
+//@substitute: naming
+
+static PyObject* __Pyx__CallUnboundCMethod0(__Pyx_CachedCFunction* cfunc, PyObject* self); /*proto*/
+#if CYTHON_COMPILING_IN_CPYTHON
+// FASTCALL methods receive "&empty_tuple" as simple "PyObject[0]*"
+#define __Pyx_CallUnboundCMethod0(cfunc, self)  \
+    (likely((cfunc)->func) ? \
+        (likely((cfunc)->flag == METH_NOARGS) ?  (*((cfunc)->func))(self, NULL) : \
+         (PY_VERSION_HEX >= 0x030600B1 && likely((cfunc)->flag == METH_FASTCALL) ? \
+            (PY_VERSION_HEX >= 0x030700A0 ? \
+                (*(__Pyx_PyCFunctionFast)(void*)(PyCFunction)(cfunc)->func)(self, &$empty_tuple, 0) : \
+                (*(__Pyx_PyCFunctionFastWithKeywords)(void*)(PyCFunction)(cfunc)->func)(self, &$empty_tuple, 0, NULL)) : \
+          (PY_VERSION_HEX >= 0x030700A0 && (cfunc)->flag == (METH_FASTCALL | METH_KEYWORDS) ? \
+            (*(__Pyx_PyCFunctionFastWithKeywords)(void*)(PyCFunction)(cfunc)->func)(self, &$empty_tuple, 0, NULL) : \
+            (likely((cfunc)->flag == (METH_VARARGS | METH_KEYWORDS)) ?  ((*(PyCFunctionWithKeywords)(void*)(PyCFunction)(cfunc)->func)(self, $empty_tuple, NULL)) : \
+               ((cfunc)->flag == METH_VARARGS ?  (*((cfunc)->func))(self, $empty_tuple) : \
+               __Pyx__CallUnboundCMethod0(cfunc, self)))))) : \
+        __Pyx__CallUnboundCMethod0(cfunc, self))
+#else
+#define __Pyx_CallUnboundCMethod0(cfunc, self)  __Pyx__CallUnboundCMethod0(cfunc, self)
+#endif
+
+/////////////// CallUnboundCMethod0 ///////////////
+//@requires: UnpackUnboundCMethod
+//@requires: PyObjectCall
+
+static PyObject* __Pyx__CallUnboundCMethod0(__Pyx_CachedCFunction* cfunc, PyObject* self) {
+    PyObject *args, *result = NULL;
+    if (unlikely(!cfunc->method) && unlikely(__Pyx_TryUnpackUnboundCMethod(cfunc) < 0)) return NULL;
+#if CYTHON_ASSUME_SAFE_MACROS
+    args = PyTuple_New(1);
+    if (unlikely(!args)) goto bad;
+    Py_INCREF(self);
+    PyTuple_SET_ITEM(args, 0, self);
+#else
+    args = PyTuple_Pack(1, self);
+    if (unlikely(!args)) goto bad;
+#endif
+    result = __Pyx_PyObject_Call(cfunc->method, args, NULL);
+    Py_DECREF(args);
+bad:
+    return result;
+}
+
+
+/////////////// CallUnboundCMethod1.proto ///////////////
+
+static PyObject* __Pyx__CallUnboundCMethod1(__Pyx_CachedCFunction* cfunc, PyObject* self, PyObject* arg);/*proto*/
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE PyObject* __Pyx_CallUnboundCMethod1(__Pyx_CachedCFunction* cfunc, PyObject* self, PyObject* arg);/*proto*/
+#else
+#define __Pyx_CallUnboundCMethod1(cfunc, self, arg)  __Pyx__CallUnboundCMethod1(cfunc, self, arg)
+#endif
+
+/////////////// CallUnboundCMethod1 ///////////////
+//@requires: UnpackUnboundCMethod
+//@requires: PyObjectCall
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE PyObject* __Pyx_CallUnboundCMethod1(__Pyx_CachedCFunction* cfunc, PyObject* self, PyObject* arg) {
+    if (likely(cfunc->func)) {
+        int flag = cfunc->flag;
+        // Not using #ifdefs for PY_VERSION_HEX to avoid C compiler warnings about unused functions.
+        if (flag == METH_O) {
+            return (*(cfunc->func))(self, arg);
+        } else if ((PY_VERSION_HEX >= 0x030600B1) && flag == METH_FASTCALL) {
+            #if PY_VERSION_HEX >= 0x030700A0
+                return (*(__Pyx_PyCFunctionFast)(void*)(PyCFunction)cfunc->func)(self, &arg, 1);
+            #else
+                return (*(__Pyx_PyCFunctionFastWithKeywords)(void*)(PyCFunction)cfunc->func)(self, &arg, 1, NULL);
+            #endif
+        } else if ((PY_VERSION_HEX >= 0x030700A0) && flag == (METH_FASTCALL | METH_KEYWORDS)) {
+            return (*(__Pyx_PyCFunctionFastWithKeywords)(void*)(PyCFunction)cfunc->func)(self, &arg, 1, NULL);
+        }
+    }
+    return __Pyx__CallUnboundCMethod1(cfunc, self, arg);
+}
+#endif
+
+static PyObject* __Pyx__CallUnboundCMethod1(__Pyx_CachedCFunction* cfunc, PyObject* self, PyObject* arg){
+    PyObject *args, *result = NULL;
+    if (unlikely(!cfunc->func && !cfunc->method) && unlikely(__Pyx_TryUnpackUnboundCMethod(cfunc) < 0)) return NULL;
+#if CYTHON_COMPILING_IN_CPYTHON
+    if (cfunc->func && (cfunc->flag & METH_VARARGS)) {
+        args = PyTuple_New(1);
+        if (unlikely(!args)) goto bad;
+        Py_INCREF(arg);
+        PyTuple_SET_ITEM(args, 0, arg);
+        if (cfunc->flag & METH_KEYWORDS)
+            result = (*(PyCFunctionWithKeywords)(void*)(PyCFunction)cfunc->func)(self, args, NULL);
+        else
+            result = (*cfunc->func)(self, args);
+    } else {
+        args = PyTuple_New(2);
+        if (unlikely(!args)) goto bad;
+        Py_INCREF(self);
+        PyTuple_SET_ITEM(args, 0, self);
+        Py_INCREF(arg);
+        PyTuple_SET_ITEM(args, 1, arg);
+        result = __Pyx_PyObject_Call(cfunc->method, args, NULL);
+    }
+#else
+    args = PyTuple_Pack(2, self, arg);
+    if (unlikely(!args)) goto bad;
+    result = __Pyx_PyObject_Call(cfunc->method, args, NULL);
+#endif
+bad:
+    Py_XDECREF(args);
+    return result;
+}
+
+
+/////////////// CallUnboundCMethod2.proto ///////////////
+
+static PyObject* __Pyx__CallUnboundCMethod2(__Pyx_CachedCFunction* cfunc, PyObject* self, PyObject* arg1, PyObject* arg2); /*proto*/
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030600B1
+static CYTHON_INLINE PyObject *__Pyx_CallUnboundCMethod2(__Pyx_CachedCFunction *cfunc, PyObject *self, PyObject *arg1, PyObject *arg2); /*proto*/
+#else
+#define __Pyx_CallUnboundCMethod2(cfunc, self, arg1, arg2)  __Pyx__CallUnboundCMethod2(cfunc, self, arg1, arg2)
+#endif
+
+/////////////// CallUnboundCMethod2 ///////////////
+//@requires: UnpackUnboundCMethod
+//@requires: PyObjectCall
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030600B1
+static CYTHON_INLINE PyObject *__Pyx_CallUnboundCMethod2(__Pyx_CachedCFunction *cfunc, PyObject *self, PyObject *arg1, PyObject *arg2) {
+    if (likely(cfunc->func)) {
+        PyObject *args[2] = {arg1, arg2};
+        if (cfunc->flag == METH_FASTCALL) {
+            #if PY_VERSION_HEX >= 0x030700A0
+            return (*(__Pyx_PyCFunctionFast)(void*)(PyCFunction)cfunc->func)(self, args, 2);
+            #else
+            return (*(__Pyx_PyCFunctionFastWithKeywords)(void*)(PyCFunction)cfunc->func)(self, args, 2, NULL);
+            #endif
+        }
+        #if PY_VERSION_HEX >= 0x030700A0
+        if (cfunc->flag == (METH_FASTCALL | METH_KEYWORDS))
+            return (*(__Pyx_PyCFunctionFastWithKeywords)(void*)(PyCFunction)cfunc->func)(self, args, 2, NULL);
+        #endif
+    }
+    return __Pyx__CallUnboundCMethod2(cfunc, self, arg1, arg2);
+}
+#endif
+
+static PyObject* __Pyx__CallUnboundCMethod2(__Pyx_CachedCFunction* cfunc, PyObject* self, PyObject* arg1, PyObject* arg2){
+    PyObject *args, *result = NULL;
+    if (unlikely(!cfunc->func && !cfunc->method) && unlikely(__Pyx_TryUnpackUnboundCMethod(cfunc) < 0)) return NULL;
+#if CYTHON_COMPILING_IN_CPYTHON
+    if (cfunc->func && (cfunc->flag & METH_VARARGS)) {
+        args = PyTuple_New(2);
+        if (unlikely(!args)) goto bad;
+        Py_INCREF(arg1);
+        PyTuple_SET_ITEM(args, 0, arg1);
+        Py_INCREF(arg2);
+        PyTuple_SET_ITEM(args, 1, arg2);
+        if (cfunc->flag & METH_KEYWORDS)
+            result = (*(PyCFunctionWithKeywords)(void*)(PyCFunction)cfunc->func)(self, args, NULL);
+        else
+            result = (*cfunc->func)(self, args);
+    } else {
+        args = PyTuple_New(3);
+        if (unlikely(!args)) goto bad;
+        Py_INCREF(self);
+        PyTuple_SET_ITEM(args, 0, self);
+        Py_INCREF(arg1);
+        PyTuple_SET_ITEM(args, 1, arg1);
+        Py_INCREF(arg2);
+        PyTuple_SET_ITEM(args, 2, arg2);
+        result = __Pyx_PyObject_Call(cfunc->method, args, NULL);
+    }
+#else
+    args = PyTuple_Pack(3, self, arg1, arg2);
+    if (unlikely(!args)) goto bad;
+    result = __Pyx_PyObject_Call(cfunc->method, args, NULL);
+#endif
+bad:
+    Py_XDECREF(args);
+    return result;
+}
+
+
+/////////////// PyObjectFastCall.proto ///////////////
+
+#define __Pyx_PyObject_FastCall(func, args, nargs)  __Pyx_PyObject_FastCallDict(func, args, (size_t)(nargs), NULL)
+static CYTHON_INLINE PyObject* __Pyx_PyObject_FastCallDict(PyObject *func, PyObject **args, size_t nargs, PyObject *kwargs); /*proto*/
+
+/////////////// PyObjectFastCall ///////////////
+//@requires: PyObjectCall
+//@requires: PyFunctionFastCall
+//@requires: PyObjectCallMethO
+//@substitute: naming
+
+#if PY_VERSION_HEX < 0x03090000 || CYTHON_COMPILING_IN_LIMITED_API
+static PyObject* __Pyx_PyObject_FastCall_fallback(PyObject *func, PyObject **args, size_t nargs, PyObject *kwargs) {
+    PyObject *argstuple;
+    PyObject *result = 0;
+    size_t i;
+
+    argstuple = PyTuple_New((Py_ssize_t)nargs);
+    if (unlikely(!argstuple)) return NULL;
+    for (i = 0; i < nargs; i++) {
+        Py_INCREF(args[i]);
+        if (__Pyx_PyTuple_SET_ITEM(argstuple, (Py_ssize_t)i, args[i]) < 0) goto bad;
+    }
+    result = __Pyx_PyObject_Call(func, argstuple, kwargs);
+  bad:
+    Py_DECREF(argstuple);
+    return result;
+}
+#endif
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_FastCallDict(PyObject *func, PyObject **args, size_t _nargs, PyObject *kwargs) {
+    // Special fast paths for 0 and 1 arguments
+    // NOTE: in many cases, this is called with a constant value for nargs
+    // which is known at compile-time. So the branches below will typically
+    // be optimized away.
+    Py_ssize_t nargs = __Pyx_PyVectorcall_NARGS(_nargs);
+#if CYTHON_COMPILING_IN_CPYTHON
+    if (nargs == 0 && kwargs == NULL) {
+        if (__Pyx_CyOrPyCFunction_Check(func) && likely( __Pyx_CyOrPyCFunction_GET_FLAGS(func) & METH_NOARGS))
+            return __Pyx_PyObject_CallMethO(func, NULL);
+    }
+    else if (nargs == 1 && kwargs == NULL) {
+        if (__Pyx_CyOrPyCFunction_Check(func) && likely( __Pyx_CyOrPyCFunction_GET_FLAGS(func) & METH_O))
+            return __Pyx_PyObject_CallMethO(func, args[0]);
+    }
+#endif
+
+    #if PY_VERSION_HEX < 0x030800B1
+    #if CYTHON_FAST_PYCCALL
+    if (PyCFunction_Check(func)) {
+        if (kwargs) {
+            return _PyCFunction_FastCallDict(func, args, nargs, kwargs);
+        } else {
+            return _PyCFunction_FastCallKeywords(func, args, nargs, NULL);
+        }
+    }
+    #if PY_VERSION_HEX >= 0x030700A1
+    if (!kwargs && __Pyx_IS_TYPE(func, &PyMethodDescr_Type)) {
+        return _PyMethodDescr_FastCallKeywords(func, args, nargs, NULL);
+    }
+    #endif
+    #endif
+    #if CYTHON_FAST_PYCALL
+    if (PyFunction_Check(func)) {
+        return __Pyx_PyFunction_FastCallDict(func, args, nargs, kwargs);
+    }
+    #endif
+    #endif
+
+    if (kwargs == NULL) {
+        #if CYTHON_VECTORCALL
+        #if PY_VERSION_HEX < 0x03090000
+        vectorcallfunc f = _PyVectorcall_Function(func);
+        #else
+        vectorcallfunc f = PyVectorcall_Function(func);
+        #endif
+        if (f) {
+            return f(func, args, (size_t)nargs, NULL);
+        }
+        #elif defined(__Pyx_CyFunction_USED) && CYTHON_BACKPORT_VECTORCALL
+        // exclude fused functions for now
+        if (__Pyx_CyFunction_CheckExact(func)) {
+            __pyx_vectorcallfunc f = __Pyx_CyFunction_func_vectorcall(func);
+            if (f) return f(func, args, (size_t)nargs, NULL);
+        }
+        #endif
+    }
+
+    if (nargs == 0) {
+        return __Pyx_PyObject_Call(func, $empty_tuple, kwargs);
+    }
+    #if PY_VERSION_HEX >= 0x03090000 && !CYTHON_COMPILING_IN_LIMITED_API
+    return PyObject_VectorcallDict(func, args, (size_t)nargs, kwargs);
+    #else
+    return __Pyx_PyObject_FastCall_fallback(func, args, (size_t)nargs, kwargs);
+    #endif
+}
+
+
+/////////////// PyObjectCallMethod0.proto ///////////////
+
+static PyObject* __Pyx_PyObject_CallMethod0(PyObject* obj, PyObject* method_name); /*proto*/
+
+/////////////// PyObjectCallMethod0 ///////////////
+//@requires: PyObjectGetMethod
+//@requires: PyObjectCallOneArg
+//@requires: PyObjectCallNoArg
+
+static PyObject* __Pyx_PyObject_CallMethod0(PyObject* obj, PyObject* method_name) {
+    PyObject *method = NULL, *result = NULL;
+    int is_method = __Pyx_PyObject_GetMethod(obj, method_name, &method);
+    if (likely(is_method)) {
+        result = __Pyx_PyObject_CallOneArg(method, obj);
+        Py_DECREF(method);
+        return result;
+    }
+    if (unlikely(!method)) goto bad;
+    result = __Pyx_PyObject_CallNoArg(method);
+    Py_DECREF(method);
+bad:
+    return result;
+}
+
+
+/////////////// PyObjectCallMethod1.proto ///////////////
+
+static PyObject* __Pyx_PyObject_CallMethod1(PyObject* obj, PyObject* method_name, PyObject* arg); /*proto*/
+
+/////////////// PyObjectCallMethod1 ///////////////
+//@requires: PyObjectGetMethod
+//@requires: PyObjectCallOneArg
+//@requires: PyObjectCall2Args
+
+#if !(CYTHON_VECTORCALL && __PYX_LIMITED_VERSION_HEX >= 0x030C00A2)
+static PyObject* __Pyx__PyObject_CallMethod1(PyObject* method, PyObject* arg) {
+    // Separate function to avoid excessive inlining.
+    PyObject *result = __Pyx_PyObject_CallOneArg(method, arg);
+    Py_DECREF(method);
+    return result;
+}
+#endif
+
+static PyObject* __Pyx_PyObject_CallMethod1(PyObject* obj, PyObject* method_name, PyObject* arg) {
+#if CYTHON_VECTORCALL && __PYX_LIMITED_VERSION_HEX >= 0x030C00A2
+    PyObject *args[2] = {obj, arg};
+    // avoid unused functions
+    (void) __Pyx_PyObject_GetMethod;
+    (void) __Pyx_PyObject_CallOneArg;
+    (void) __Pyx_PyObject_Call2Args;
+    return PyObject_VectorcallMethod(method_name, args, 2 | PY_VECTORCALL_ARGUMENTS_OFFSET, NULL);
+#else
+    PyObject *method = NULL, *result;
+    int is_method = __Pyx_PyObject_GetMethod(obj, method_name, &method);
+    if (likely(is_method)) {
+        result = __Pyx_PyObject_Call2Args(method, obj, arg);
+        Py_DECREF(method);
+        return result;
+    }
+    if (unlikely(!method)) return NULL;
+    return __Pyx__PyObject_CallMethod1(method, arg);
+#endif
+}
+
+
+/////////////// tp_new.proto ///////////////
+
+#define __Pyx_tp_new(type_obj, args) __Pyx_tp_new_kwargs(type_obj, args, NULL)
+static CYTHON_INLINE PyObject* __Pyx_tp_new_kwargs(PyObject* type_obj, PyObject* args, PyObject* kwargs) {
+    return (PyObject*) (((PyTypeObject*)type_obj)->tp_new((PyTypeObject*)type_obj, args, kwargs));
+}
+
+
+/////////////// PyObjectCall.proto ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE PyObject* __Pyx_PyObject_Call(PyObject *func, PyObject *arg, PyObject *kw); /*proto*/
+#else
+#define __Pyx_PyObject_Call(func, arg, kw) PyObject_Call(func, arg, kw)
+#endif
+
+/////////////// PyObjectCall ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE PyObject* __Pyx_PyObject_Call(PyObject *func, PyObject *arg, PyObject *kw) {
+    PyObject *result;
+    ternaryfunc call = Py_TYPE(func)->tp_call;
+
+    if (unlikely(!call))
+        return PyObject_Call(func, arg, kw);
+    #if PY_MAJOR_VERSION < 3
+    if (unlikely(Py_EnterRecursiveCall((char*)" while calling a Python object")))
+        return NULL;
+    #else
+    if (unlikely(Py_EnterRecursiveCall(" while calling a Python object")))
+        return NULL;
+    #endif
+    result = (*call)(func, arg, kw);
+    Py_LeaveRecursiveCall();
+    if (unlikely(!result) && unlikely(!PyErr_Occurred())) {
+        PyErr_SetString(
+            PyExc_SystemError,
+            "NULL result without error in PyObject_Call");
+    }
+    return result;
+}
+#endif
+
+
+/////////////// PyObjectCallMethO.proto ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE PyObject* __Pyx_PyObject_CallMethO(PyObject *func, PyObject *arg); /*proto*/
+#endif
+
+/////////////// PyObjectCallMethO ///////////////
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE PyObject* __Pyx_PyObject_CallMethO(PyObject *func, PyObject *arg) {
+    PyObject *self, *result;
+    PyCFunction cfunc;
+    cfunc = __Pyx_CyOrPyCFunction_GET_FUNCTION(func);
+    self = __Pyx_CyOrPyCFunction_GET_SELF(func);
+
+    #if PY_MAJOR_VERSION < 3
+    if (unlikely(Py_EnterRecursiveCall((char*)" while calling a Python object")))
+        return NULL;
+    #else
+    if (unlikely(Py_EnterRecursiveCall(" while calling a Python object")))
+        return NULL;
+    #endif
+    result = cfunc(self, arg);
+    Py_LeaveRecursiveCall();
+    if (unlikely(!result) && unlikely(!PyErr_Occurred())) {
+        PyErr_SetString(
+            PyExc_SystemError,
+            "NULL result without error in PyObject_Call");
+    }
+    return result;
+}
+#endif
+
+
+/////////////// PyFunctionFastCall.proto ///////////////
+
+#if CYTHON_FAST_PYCALL
+
+#if !CYTHON_VECTORCALL
+#define __Pyx_PyFunction_FastCall(func, args, nargs) \
+    __Pyx_PyFunction_FastCallDict((func), (args), (nargs), NULL)
+
+static PyObject *__Pyx_PyFunction_FastCallDict(PyObject *func, PyObject **args, Py_ssize_t nargs, PyObject *kwargs);
+#endif
+
+// Backport from Python 3
+// Assert a build-time dependency, as an expression.
+//   Your compile will fail if the condition isn't true, or can't be evaluated
+//   by the compiler. This can be used in an expression: its value is 0.
+// Example:
+//   #define foo_to_char(foo)  \
+//       ((char *)(foo)        \
+//        + Py_BUILD_ASSERT_EXPR(offsetof(struct foo, string) == 0))
+//
+//   Written by Rusty Russell, public domain, https://ccodearchive.net/
+#define __Pyx_BUILD_ASSERT_EXPR(cond) \
+    (sizeof(char [1 - 2*!(cond)]) - 1)
+
+#ifndef Py_MEMBER_SIZE
+// Get the size of a structure member in bytes
+#define Py_MEMBER_SIZE(type, member) sizeof(((type *)0)->member)
+#endif
+
+#if !CYTHON_VECTORCALL
+#if PY_VERSION_HEX >= 0x03080000
+  #include "frameobject.h"
+#if PY_VERSION_HEX >= 0x030b00a6 && !CYTHON_COMPILING_IN_LIMITED_API && !defined(PYPY_VERSION)
+  #ifndef Py_BUILD_CORE
+    #define Py_BUILD_CORE 1
+  #endif
+  #include "internal/pycore_frame.h"
+#endif
+  #define __Pxy_PyFrame_Initialize_Offsets()
+  #define __Pyx_PyFrame_GetLocalsplus(frame)  ((frame)->f_localsplus)
+#else
+  // Initialised by module init code.
+  static size_t __pyx_pyframe_localsplus_offset = 0;
+
+  #include "frameobject.h"
+  // This is the long runtime version of
+  //     #define __Pyx_PyFrame_GetLocalsplus(frame)  ((frame)->f_localsplus)
+  // offsetof(PyFrameObject, f_localsplus) differs between regular C-Python and Stackless Python < 3.8.
+  // Therefore the offset is computed at run time from PyFrame_type.tp_basicsize. That is feasible,
+  // because f_localsplus is the last field of PyFrameObject (checked by Py_BUILD_ASSERT_EXPR below).
+  #define __Pxy_PyFrame_Initialize_Offsets()  \
+    ((void)__Pyx_BUILD_ASSERT_EXPR(sizeof(PyFrameObject) == offsetof(PyFrameObject, f_localsplus) + Py_MEMBER_SIZE(PyFrameObject, f_localsplus)), \
+     (void)(__pyx_pyframe_localsplus_offset = ((size_t)PyFrame_Type.tp_basicsize) - Py_MEMBER_SIZE(PyFrameObject, f_localsplus)))
+  #define __Pyx_PyFrame_GetLocalsplus(frame)  \
+    (assert(__pyx_pyframe_localsplus_offset), (PyObject **)(((char *)(frame)) + __pyx_pyframe_localsplus_offset))
+#endif
+#endif /* !CYTHON_VECTORCALL */
+
+#endif /* CYTHON_FAST_PYCALL */
+
+
+/////////////// PyFunctionFastCall ///////////////
+// copied from CPython 3.6 ceval.c
+
+#if CYTHON_FAST_PYCALL && !CYTHON_VECTORCALL
+static PyObject* __Pyx_PyFunction_FastCallNoKw(PyCodeObject *co, PyObject **args, Py_ssize_t na,
+                                               PyObject *globals) {
+    PyFrameObject *f;
+    PyThreadState *tstate = __Pyx_PyThreadState_Current;
+    PyObject **fastlocals;
+    Py_ssize_t i;
+    PyObject *result;
+
+    assert(globals != NULL);
+    /* XXX Perhaps we should create a specialized
+       PyFrame_New() that doesn't take locals, but does
+       take builtins without sanity checking them.
+       */
+    assert(tstate != NULL);
+    f = PyFrame_New(tstate, co, globals, NULL);
+    if (f == NULL) {
+        return NULL;
+    }
+
+    fastlocals = __Pyx_PyFrame_GetLocalsplus(f);
+
+    for (i = 0; i < na; i++) {
+        Py_INCREF(*args);
+        fastlocals[i] = *args++;
+    }
+    result = PyEval_EvalFrameEx(f,0);
+
+    ++tstate->recursion_depth;
+    Py_DECREF(f);
+    --tstate->recursion_depth;
+
+    return result;
+}
+
+
+static PyObject *__Pyx_PyFunction_FastCallDict(PyObject *func, PyObject **args, Py_ssize_t nargs, PyObject *kwargs) {
+    PyCodeObject *co = (PyCodeObject *)PyFunction_GET_CODE(func);
+    PyObject *globals = PyFunction_GET_GLOBALS(func);
+    PyObject *argdefs = PyFunction_GET_DEFAULTS(func);
+    PyObject *closure;
+#if PY_MAJOR_VERSION >= 3
+    PyObject *kwdefs;
+    //#if PY_VERSION_HEX >= 0x03050000
+    //PyObject *name, *qualname;
+    //#endif
+#endif
+    PyObject *kwtuple, **k;
+    PyObject **d;
+    Py_ssize_t nd;
+    Py_ssize_t nk;
+    PyObject *result;
+
+    assert(kwargs == NULL || PyDict_Check(kwargs));
+    nk = kwargs ? PyDict_Size(kwargs) : 0;
+
+    #if PY_MAJOR_VERSION < 3
+    if (unlikely(Py_EnterRecursiveCall((char*)" while calling a Python object"))) {
+        return NULL;
+    }
+    #else
+    if (unlikely(Py_EnterRecursiveCall(" while calling a Python object"))) {
+        return NULL;
+    }
+    #endif
+
+    if (
+#if PY_MAJOR_VERSION >= 3
+            co->co_kwonlyargcount == 0 &&
+#endif
+            likely(kwargs == NULL || nk == 0) &&
+            co->co_flags == (CO_OPTIMIZED | CO_NEWLOCALS | CO_NOFREE)) {
+        /* Fast paths */
+        if (argdefs == NULL && co->co_argcount == nargs) {
+            result = __Pyx_PyFunction_FastCallNoKw(co, args, nargs, globals);
+            goto done;
+        }
+        else if (nargs == 0 && argdefs != NULL
+                 && co->co_argcount == Py_SIZE(argdefs)) {
+            /* function called with no arguments, but all parameters have
+               a default value: use default values as arguments .*/
+            args = &PyTuple_GET_ITEM(argdefs, 0);
+            result =__Pyx_PyFunction_FastCallNoKw(co, args, Py_SIZE(argdefs), globals);
+            goto done;
+        }
+    }
+
+    if (kwargs != NULL) {
+        Py_ssize_t pos, i;
+        kwtuple = PyTuple_New(2 * nk);
+        if (kwtuple == NULL) {
+            result = NULL;
+            goto done;
+        }
+
+        k = &PyTuple_GET_ITEM(kwtuple, 0);
+        pos = i = 0;
+        while (PyDict_Next(kwargs, &pos, &k[i], &k[i+1])) {
+            Py_INCREF(k[i]);
+            Py_INCREF(k[i+1]);
+            i += 2;
+        }
+        nk = i / 2;
+    }
+    else {
+        kwtuple = NULL;
+        k = NULL;
+    }
+
+    closure = PyFunction_GET_CLOSURE(func);
+#if PY_MAJOR_VERSION >= 3
+    kwdefs = PyFunction_GET_KW_DEFAULTS(func);
+    //#if PY_VERSION_HEX >= 0x03050000
+    //name = ((PyFunctionObject *)func) -> func_name;
+    //qualname = ((PyFunctionObject *)func) -> func_qualname;
+    //#endif
+#endif
+
+    if (argdefs != NULL) {
+        d = &PyTuple_GET_ITEM(argdefs, 0);
+        nd = Py_SIZE(argdefs);
+    }
+    else {
+        d = NULL;
+        nd = 0;
+    }
+
+    //#if PY_VERSION_HEX >= 0x03050000
+    //return _PyEval_EvalCodeWithName((PyObject*)co, globals, (PyObject *)NULL,
+    //                                args, nargs,
+    //                                NULL, 0,
+    //                                d, nd, kwdefs,
+    //                                closure, name, qualname);
+    //#elif PY_MAJOR_VERSION >= 3
+#if PY_MAJOR_VERSION >= 3
+    result = PyEval_EvalCodeEx((PyObject*)co, globals, (PyObject *)NULL,
+                               args, (int)nargs,
+                               k, (int)nk,
+                               d, (int)nd, kwdefs, closure);
+#else
+    result = PyEval_EvalCodeEx(co, globals, (PyObject *)NULL,
+                               args, (int)nargs,
+                               k, (int)nk,
+                               d, (int)nd, closure);
+#endif
+    Py_XDECREF(kwtuple);
+
+done:
+    Py_LeaveRecursiveCall();
+    return result;
+}
+#endif  /* CYTHON_FAST_PYCALL && !CYTHON_VECTORCALL */
+
+
+/////////////// PyObjectCall2Args.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_Call2Args(PyObject* function, PyObject* arg1, PyObject* arg2); /*proto*/
+
+/////////////// PyObjectCall2Args ///////////////
+//@requires: PyObjectFastCall
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_Call2Args(PyObject* function, PyObject* arg1, PyObject* arg2) {
+    PyObject *args[3] = {NULL, arg1, arg2};
+    return __Pyx_PyObject_FastCall(function, args+1, 2 | __Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET);
+}
+
+
+/////////////// PyObjectCallOneArg.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_CallOneArg(PyObject *func, PyObject *arg); /*proto*/
+
+/////////////// PyObjectCallOneArg ///////////////
+//@requires: PyObjectFastCall
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_CallOneArg(PyObject *func, PyObject *arg) {
+    PyObject *args[2] = {NULL, arg};
+    return __Pyx_PyObject_FastCall(func, args+1, 1 | __Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET);
+}
+
+
+/////////////// PyObjectCallNoArg.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_CallNoArg(PyObject *func); /*proto*/
+
+/////////////// PyObjectCallNoArg ///////////////
+//@requires: PyObjectFastCall
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_CallNoArg(PyObject *func) {
+    PyObject *arg[2] = {NULL, NULL};
+    return __Pyx_PyObject_FastCall(func, arg + 1, 0 | __Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET);
+}
+
+
+/////////////// PyVectorcallFastCallDict.proto ///////////////
+
+#if CYTHON_METH_FASTCALL
+static CYTHON_INLINE PyObject *__Pyx_PyVectorcall_FastCallDict(PyObject *func, __pyx_vectorcallfunc vc, PyObject *const *args, size_t nargs, PyObject *kw);
+#endif
+
+/////////////// PyVectorcallFastCallDict ///////////////
+
+#if CYTHON_METH_FASTCALL
+// Slow path when kw is non-empty
+static PyObject *__Pyx_PyVectorcall_FastCallDict_kw(PyObject *func, __pyx_vectorcallfunc vc, PyObject *const *args, size_t nargs, PyObject *kw)
+{
+    // Code based on _PyObject_FastCallDict() and _PyStack_UnpackDict() from CPython
+    PyObject *res = NULL;
+    PyObject *kwnames;
+    PyObject **newargs;
+    PyObject **kwvalues;
+    Py_ssize_t i, pos;
+    size_t j;
+    PyObject *key, *value;
+    unsigned long keys_are_strings;
+    Py_ssize_t nkw = PyDict_GET_SIZE(kw);
+
+    // Copy positional arguments
+    newargs = (PyObject **)PyMem_Malloc((nargs + (size_t)nkw) * sizeof(args[0]));
+    if (unlikely(newargs == NULL)) {
+        PyErr_NoMemory();
+        return NULL;
+    }
+    for (j = 0; j < nargs; j++) newargs[j] = args[j];
+
+    // Copy keyword arguments
+    kwnames = PyTuple_New(nkw);
+    if (unlikely(kwnames == NULL)) {
+        PyMem_Free(newargs);
+        return NULL;
+    }
+    kwvalues = newargs + nargs;
+    pos = i = 0;
+    keys_are_strings = Py_TPFLAGS_UNICODE_SUBCLASS;
+    while (PyDict_Next(kw, &pos, &key, &value)) {
+        keys_are_strings &= Py_TYPE(key)->tp_flags;
+        Py_INCREF(key);
+        Py_INCREF(value);
+        PyTuple_SET_ITEM(kwnames, i, key);
+        kwvalues[i] = value;
+        i++;
+    }
+    if (unlikely(!keys_are_strings)) {
+        PyErr_SetString(PyExc_TypeError, "keywords must be strings");
+        goto cleanup;
+    }
+
+    // The actual call
+    res = vc(func, newargs, nargs, kwnames);
+
+cleanup:
+    Py_DECREF(kwnames);
+    for (i = 0; i < nkw; i++)
+        Py_DECREF(kwvalues[i]);
+    PyMem_Free(newargs);
+    return res;
+}
+
+static CYTHON_INLINE PyObject *__Pyx_PyVectorcall_FastCallDict(PyObject *func, __pyx_vectorcallfunc vc, PyObject *const *args, size_t nargs, PyObject *kw)
+{
+    if (likely(kw == NULL) || PyDict_GET_SIZE(kw) == 0) {
+        return vc(func, args, nargs, NULL);
+    }
+    return __Pyx_PyVectorcall_FastCallDict_kw(func, vc, args, nargs, kw);
+}
+#endif
+
+
+/////////////// MatrixMultiply.proto ///////////////
+
+#if PY_VERSION_HEX >= 0x03050000
+  #define __Pyx_PyNumber_MatrixMultiply(x,y)         PyNumber_MatrixMultiply(x,y)
+  #define __Pyx_PyNumber_InPlaceMatrixMultiply(x,y)  PyNumber_InPlaceMatrixMultiply(x,y)
+#else
+#define __Pyx_PyNumber_MatrixMultiply(x,y)         __Pyx__PyNumber_MatrixMultiply(x, y, "@")
+static PyObject* __Pyx__PyNumber_MatrixMultiply(PyObject* x, PyObject* y, const char* op_name);
+static PyObject* __Pyx_PyNumber_InPlaceMatrixMultiply(PyObject* x, PyObject* y);
+#endif
+
+/////////////// MatrixMultiply ///////////////
+//@requires: PyObjectGetAttrStrNoError
+//@requires: PyObjectCallOneArg
+//@requires: PyObjectCall2Args
+
+#if PY_VERSION_HEX < 0x03050000
+static PyObject* __Pyx_PyObject_CallMatrixMethod(PyObject* method, PyObject* arg) {
+    // NOTE: eats the method reference
+    PyObject *result = NULL;
+#if CYTHON_UNPACK_METHODS
+    if (likely(PyMethod_Check(method))) {
+        PyObject *self = PyMethod_GET_SELF(method);
+        if (likely(self)) {
+            PyObject *function = PyMethod_GET_FUNCTION(method);
+            result = __Pyx_PyObject_Call2Args(function, self, arg);
+            goto done;
+        }
+    }
+#endif
+    result = __Pyx_PyObject_CallOneArg(method, arg);
+done:
+    Py_DECREF(method);
+    return result;
+}
+
+#define __Pyx_TryMatrixMethod(x, y, py_method_name) {                     \
+    PyObject *func = __Pyx_PyObject_GetAttrStrNoError(x, py_method_name); \
+    if (func) {                                                         \
+        PyObject *result = __Pyx_PyObject_CallMatrixMethod(func, y);    \
+        if (result != Py_NotImplemented)                                \
+            return result;                                              \
+        Py_DECREF(result);                                              \
+    } else if (unlikely(PyErr_Occurred())) {                            \
+        return NULL;                                                    \
+    }                                                                   \
+}
+
+static PyObject* __Pyx__PyNumber_MatrixMultiply(PyObject* x, PyObject* y, const char* op_name) {
+    __Pyx_TypeName x_type_name;
+    __Pyx_TypeName y_type_name;
+    int right_is_subtype = PyObject_IsSubclass((PyObject*)Py_TYPE(y), (PyObject*)Py_TYPE(x));
+    if (unlikely(right_is_subtype == -1))
+        return NULL;
+    if (right_is_subtype) {
+        // to allow subtypes to override parent behaviour, try reversed operation first
+        // see note at https://docs.python.org/3/reference/datamodel.html#emulating-numeric-types
+        __Pyx_TryMatrixMethod(y, x, PYIDENT("__rmatmul__"))
+    }
+    __Pyx_TryMatrixMethod(x, y, PYIDENT("__matmul__"))
+    if (!right_is_subtype) {
+        __Pyx_TryMatrixMethod(y, x, PYIDENT("__rmatmul__"))
+    }
+    x_type_name = __Pyx_PyType_GetName(Py_TYPE(x));
+    y_type_name = __Pyx_PyType_GetName(Py_TYPE(y));
+    PyErr_Format(PyExc_TypeError,
+        "unsupported operand type(s) for %.2s: '" __Pyx_FMT_TYPENAME "' and '"
+        __Pyx_FMT_TYPENAME "'", op_name, x_type_name, y_type_name);
+    __Pyx_DECREF_TypeName(x_type_name);
+    __Pyx_DECREF_TypeName(y_type_name);
+    return NULL;
+}
+
+static PyObject* __Pyx_PyNumber_InPlaceMatrixMultiply(PyObject* x, PyObject* y) {
+    __Pyx_TryMatrixMethod(x, y, PYIDENT("__imatmul__"))
+    return __Pyx__PyNumber_MatrixMultiply(x, y, "@=");
+}
+
+#undef __Pyx_TryMatrixMethod
+#endif
+
+
+/////////////// PyDictVersioning.proto ///////////////
+
+#if CYTHON_USE_DICT_VERSIONS && CYTHON_USE_TYPE_SLOTS
+#define __PYX_DICT_VERSION_INIT  ((PY_UINT64_T) -1)
+#define __PYX_GET_DICT_VERSION(dict)  (((PyDictObject*)(dict))->ma_version_tag)
+#define __PYX_UPDATE_DICT_CACHE(dict, value, cache_var, version_var) \
+    (version_var) = __PYX_GET_DICT_VERSION(dict); \
+    (cache_var) = (value);
+
+#define __PYX_PY_DICT_LOOKUP_IF_MODIFIED(VAR, DICT, LOOKUP) { \
+    static PY_UINT64_T __pyx_dict_version = 0; \
+    static PyObject *__pyx_dict_cached_value = NULL; \
+    if (likely(__PYX_GET_DICT_VERSION(DICT) == __pyx_dict_version)) { \
+        (VAR) = __pyx_dict_cached_value; \
+    } else { \
+        (VAR) = __pyx_dict_cached_value = (LOOKUP); \
+        __pyx_dict_version = __PYX_GET_DICT_VERSION(DICT); \
+    } \
+}
+
+static CYTHON_INLINE PY_UINT64_T __Pyx_get_tp_dict_version(PyObject *obj); /*proto*/
+static CYTHON_INLINE PY_UINT64_T __Pyx_get_object_dict_version(PyObject *obj); /*proto*/
+static CYTHON_INLINE int __Pyx_object_dict_version_matches(PyObject* obj, PY_UINT64_T tp_dict_version, PY_UINT64_T obj_dict_version); /*proto*/
+
+#else
+#define __PYX_GET_DICT_VERSION(dict)  (0)
+#define __PYX_UPDATE_DICT_CACHE(dict, value, cache_var, version_var)
+#define __PYX_PY_DICT_LOOKUP_IF_MODIFIED(VAR, DICT, LOOKUP)  (VAR) = (LOOKUP);
+#endif
+
+/////////////// PyDictVersioning ///////////////
+
+#if CYTHON_USE_DICT_VERSIONS && CYTHON_USE_TYPE_SLOTS
+static CYTHON_INLINE PY_UINT64_T __Pyx_get_tp_dict_version(PyObject *obj) {
+    PyObject *dict = Py_TYPE(obj)->tp_dict;
+    return likely(dict) ? __PYX_GET_DICT_VERSION(dict) : 0;
+}
+
+static CYTHON_INLINE PY_UINT64_T __Pyx_get_object_dict_version(PyObject *obj) {
+    PyObject **dictptr = NULL;
+    Py_ssize_t offset = Py_TYPE(obj)->tp_dictoffset;
+    if (offset) {
+#if CYTHON_COMPILING_IN_CPYTHON
+        dictptr = (likely(offset > 0)) ? (PyObject **) ((char *)obj + offset) : _PyObject_GetDictPtr(obj);
+#else
+        dictptr = _PyObject_GetDictPtr(obj);
+#endif
+    }
+    return (dictptr && *dictptr) ? __PYX_GET_DICT_VERSION(*dictptr) : 0;
+}
+
+static CYTHON_INLINE int __Pyx_object_dict_version_matches(PyObject* obj, PY_UINT64_T tp_dict_version, PY_UINT64_T obj_dict_version) {
+    PyObject *dict = Py_TYPE(obj)->tp_dict;
+    if (unlikely(!dict) || unlikely(tp_dict_version != __PYX_GET_DICT_VERSION(dict)))
+        return 0;
+    return obj_dict_version == __Pyx_get_object_dict_version(obj);
+}
+#endif
+
+
+/////////////// PyMethodNew.proto ///////////////
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+static PyObject *__Pyx_PyMethod_New(PyObject *func, PyObject *self, PyObject *typ) {
+    PyObject *typesModule=NULL, *methodType=NULL, *result=NULL;
+    CYTHON_UNUSED_VAR(typ);
+    if (!self)
+        return __Pyx_NewRef(func);
+    typesModule = PyImport_ImportModule("types");
+    if (!typesModule) return NULL;
+    methodType = PyObject_GetAttrString(typesModule, "MethodType");
+    Py_DECREF(typesModule);
+    if (!methodType) return NULL;
+    result = PyObject_CallFunctionObjArgs(methodType, func, self, NULL);
+    Py_DECREF(methodType);
+    return result;
+}
+#elif PY_MAJOR_VERSION >= 3
+// This should be an actual function (not a macro), such that we can put it
+// directly in a tp_descr_get slot.
+static PyObject *__Pyx_PyMethod_New(PyObject *func, PyObject *self, PyObject *typ) {
+    CYTHON_UNUSED_VAR(typ);
+    if (!self)
+        return __Pyx_NewRef(func);
+    return PyMethod_New(func, self);
+}
+#else
+    #define __Pyx_PyMethod_New PyMethod_New
+#endif
+
+///////////// PyMethodNew2Arg.proto /////////////
+
+// Another wrapping of PyMethod_New that matches the Python3 signature
+#if PY_MAJOR_VERSION >= 3
+#define __Pyx_PyMethod_New2Arg PyMethod_New
+#else
+#define __Pyx_PyMethod_New2Arg(func, self) PyMethod_New(func, self, (PyObject*)Py_TYPE(self))
+#endif
+
+/////////////// UnicodeConcatInPlace.proto ////////////////
+
+# if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+// __Pyx_PyUnicode_ConcatInPlace may modify the first argument 'left'
+// However, unlike `PyUnicode_Append` it will never NULL it.
+// It behaves like a regular function - returns a new reference and NULL on error
+    #if CYTHON_REFNANNY
+        #define __Pyx_PyUnicode_ConcatInPlace(left, right) __Pyx_PyUnicode_ConcatInPlaceImpl(&left, right, __pyx_refnanny)
+    #else
+        #define __Pyx_PyUnicode_ConcatInPlace(left, right) __Pyx_PyUnicode_ConcatInPlaceImpl(&left, right)
+    #endif
+    // __Pyx_PyUnicode_ConcatInPlace is slightly odd because it has the potential to modify the input
+    // argument (but only in cases where no user should notice). Therefore, it needs to keep Cython's
+    // refnanny informed.
+    static CYTHON_INLINE PyObject *__Pyx_PyUnicode_ConcatInPlaceImpl(PyObject **p_left, PyObject *right
+        #if CYTHON_REFNANNY
+        , void* __pyx_refnanny
+        #endif
+    ); /* proto */
+#else
+#define __Pyx_PyUnicode_ConcatInPlace __Pyx_PyUnicode_Concat
+#endif
+#define __Pyx_PyUnicode_ConcatInPlaceSafe(left, right) ((unlikely((left) == Py_None) || unlikely((right) == Py_None)) ? \
+    PyNumber_InPlaceAdd(left, right) : __Pyx_PyUnicode_ConcatInPlace(left, right))
+
+/////////////// UnicodeConcatInPlace ////////////////
+//@substitute: naming
+
+# if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+// copied directly from unicode_object.c "unicode_modifiable
+// removing _PyUnicode_HASH since it's a macro we don't have
+//  - this is OK because trying PyUnicode_Resize on a non-modifyable
+//  object will still work, it just won't happen in place
+static int
+__Pyx_unicode_modifiable(PyObject *unicode)
+{
+    if (Py_REFCNT(unicode) != 1)
+        return 0;
+    if (!PyUnicode_CheckExact(unicode))
+        return 0;
+    if (PyUnicode_CHECK_INTERNED(unicode))
+        return 0;
+    return 1;
+}
+
+static CYTHON_INLINE PyObject *__Pyx_PyUnicode_ConcatInPlaceImpl(PyObject **p_left, PyObject *right
+        #if CYTHON_REFNANNY
+        , void* __pyx_refnanny
+        #endif
+    ) {
+    // heavily based on PyUnicode_Append
+    PyObject *left = *p_left;
+    Py_ssize_t left_len, right_len, new_len;
+
+    if (unlikely(__Pyx_PyUnicode_READY(left) == -1))
+        return NULL;
+    if (unlikely(__Pyx_PyUnicode_READY(right) == -1))
+        return NULL;
+
+    // Shortcuts
+    left_len = PyUnicode_GET_LENGTH(left);
+    if (left_len == 0) {
+        Py_INCREF(right);
+        return right;
+    }
+    right_len = PyUnicode_GET_LENGTH(right);
+    if (right_len == 0) {
+        Py_INCREF(left);
+        return left;
+    }
+    if (unlikely(left_len > PY_SSIZE_T_MAX - right_len)) {
+        PyErr_SetString(PyExc_OverflowError,
+                        "strings are too large to concat");
+        return NULL;
+    }
+    new_len = left_len + right_len;
+
+    if (__Pyx_unicode_modifiable(left)
+            && PyUnicode_CheckExact(right)
+            && PyUnicode_KIND(right) <= PyUnicode_KIND(left)
+            // Don't resize for ascii += latin1. Convert ascii to latin1 requires
+            //   to change the structure size, but characters are stored just after
+            //   the structure, and so it requires to move all characters which is
+            //   not so different than duplicating the string.
+            && !(PyUnicode_IS_ASCII(left) && !PyUnicode_IS_ASCII(right))) {
+
+        int ret;
+        // GIVEREF/GOTREF since we expect *p_left to change (although it won't change on failures).
+        __Pyx_GIVEREF(*p_left);
+        ret = PyUnicode_Resize(p_left, new_len);
+        __Pyx_GOTREF(*p_left);
+        if (unlikely(ret != 0))
+            return NULL;
+
+        // copy 'right' into the newly allocated area of 'left'
+        #if PY_VERSION_HEX >= 0x030d0000
+        if (unlikely(PyUnicode_CopyCharacters(*p_left, left_len, right, 0, right_len) < 0)) return NULL;
+        #else
+        _PyUnicode_FastCopyCharacters(*p_left, left_len, right, 0, right_len);
+        #endif
+        __Pyx_INCREF(*p_left);
+        __Pyx_GIVEREF(*p_left);
+        return *p_left;
+    } else {
+        return __Pyx_PyUnicode_Concat(left, right);
+    }
+  }
+#endif
+
+////////////// StrConcatInPlace.proto ///////////////////////
+//@requires: UnicodeConcatInPlace
+
+#if PY_MAJOR_VERSION >= 3
+    // allow access to the more efficient versions where we know str_type is unicode
+    #define __Pyx_PyStr_Concat __Pyx_PyUnicode_Concat
+    #define __Pyx_PyStr_ConcatInPlace __Pyx_PyUnicode_ConcatInPlace
+#else
+    #define __Pyx_PyStr_Concat PyNumber_Add
+    #define __Pyx_PyStr_ConcatInPlace PyNumber_InPlaceAdd
+#endif
+#define __Pyx_PyStr_ConcatSafe(a, b) ((unlikely((a) == Py_None) || unlikely((b) == Py_None)) ? \
+    PyNumber_Add(a, b) : __Pyx_PyStr_Concat(a, b))
+#define __Pyx_PyStr_ConcatInPlaceSafe(a, b) ((unlikely((a) == Py_None) || unlikely((b) == Py_None)) ? \
+    PyNumber_InPlaceAdd(a, b) : __Pyx_PyStr_ConcatInPlace(a, b))
+
+
+/////////////// PySequenceMultiply.proto ///////////////
+
+#define __Pyx_PySequence_Multiply_Left(mul, seq)  __Pyx_PySequence_Multiply(seq, mul)
+static CYTHON_INLINE PyObject* __Pyx_PySequence_Multiply(PyObject *seq, Py_ssize_t mul);
+
+/////////////// PySequenceMultiply ///////////////
+
+static PyObject* __Pyx_PySequence_Multiply_Generic(PyObject *seq, Py_ssize_t mul) {
+    PyObject *result, *pymul = PyInt_FromSsize_t(mul);
+    if (unlikely(!pymul))
+        return NULL;
+    result = PyNumber_Multiply(seq, pymul);
+    Py_DECREF(pymul);
+    return result;
+}
+
+static CYTHON_INLINE PyObject* __Pyx_PySequence_Multiply(PyObject *seq, Py_ssize_t mul) {
+#if CYTHON_USE_TYPE_SLOTS
+    PyTypeObject *type = Py_TYPE(seq);
+    if (likely(type->tp_as_sequence && type->tp_as_sequence->sq_repeat)) {
+        return type->tp_as_sequence->sq_repeat(seq, mul);
+    } else
+#endif
+    {
+        return __Pyx_PySequence_Multiply_Generic(seq, mul);
+    }
+}
+
+
+/////////////// FormatTypeName.proto ///////////////
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+typedef PyObject *__Pyx_TypeName;
+#define __Pyx_FMT_TYPENAME "%U"
+static __Pyx_TypeName __Pyx_PyType_GetName(PyTypeObject* tp); /*proto*/
+#define __Pyx_DECREF_TypeName(obj) Py_XDECREF(obj)
+#else
+typedef const char *__Pyx_TypeName;
+#define __Pyx_FMT_TYPENAME "%.200s"
+#define __Pyx_PyType_GetName(tp) ((tp)->tp_name)
+#define __Pyx_DECREF_TypeName(obj)
+#endif
+
+/////////////// FormatTypeName ///////////////
+
+#if CYTHON_COMPILING_IN_LIMITED_API
+static __Pyx_TypeName
+__Pyx_PyType_GetName(PyTypeObject* tp)
+{
+    PyObject *name = __Pyx_PyObject_GetAttrStr((PyObject *)tp,
+                                               PYIDENT("__name__"));
+    if (unlikely(name == NULL) || unlikely(!PyUnicode_Check(name))) {
+        PyErr_Clear();
+        Py_XDECREF(name);
+        name = __Pyx_NewRef(PYIDENT("?"));
+    }
+    return name;
+}
+#endif
+
+
+/////////////// RaiseUnexpectedTypeError.proto ///////////////
+
+static int __Pyx_RaiseUnexpectedTypeError(const char *expected, PyObject *obj); /*proto*/
+
+/////////////// RaiseUnexpectedTypeError ///////////////
+
+static int
+__Pyx_RaiseUnexpectedTypeError(const char *expected, PyObject *obj)
+{
+    __Pyx_TypeName obj_type_name = __Pyx_PyType_GetName(Py_TYPE(obj));
+    PyErr_Format(PyExc_TypeError, "Expected %s, got " __Pyx_FMT_TYPENAME,
+                 expected, obj_type_name);
+    __Pyx_DECREF_TypeName(obj_type_name);
+    return 0;
+}
+
+
+/////////////// RaiseUnboundLocalError.proto ///////////////
+static CYTHON_INLINE void __Pyx_RaiseUnboundLocalError(const char *varname);/*proto*/
+
+/////////////// RaiseUnboundLocalError ///////////////
+static CYTHON_INLINE void __Pyx_RaiseUnboundLocalError(const char *varname) {
+    PyErr_Format(PyExc_UnboundLocalError, "local variable '%s' referenced before assignment", varname);
+}
+
+
+/////////////// RaiseClosureNameError.proto ///////////////
+static CYTHON_INLINE void __Pyx_RaiseClosureNameError(const char *varname);/*proto*/
+
+/////////////// RaiseClosureNameError ///////////////
+static CYTHON_INLINE void __Pyx_RaiseClosureNameError(const char *varname) {
+    PyErr_Format(PyExc_NameError, "free variable '%s' referenced before assignment in enclosing scope", varname);
+}
+
+
+/////////////// RaiseUnboundMemoryviewSliceNogil.proto ///////////////
+static void __Pyx_RaiseUnboundMemoryviewSliceNogil(const char *varname);/*proto*/
+
+/////////////// RaiseUnboundMemoryviewSliceNogil ///////////////
+//@requires: RaiseUnboundLocalError
+
+// Don't inline the function, it should really never be called in production
+static void __Pyx_RaiseUnboundMemoryviewSliceNogil(const char *varname) {
+    #ifdef WITH_THREAD
+    PyGILState_STATE gilstate = PyGILState_Ensure();
+    #endif
+    __Pyx_RaiseUnboundLocalError(varname);
+    #ifdef WITH_THREAD
+    PyGILState_Release(gilstate);
+    #endif
+}
+
+//////////////// RaiseCppGlobalNameError.proto ///////////////////////
+static CYTHON_INLINE void __Pyx_RaiseCppGlobalNameError(const char *varname); /*proto*/
+
+/////////////// RaiseCppGlobalNameError //////////////////////////////
+static CYTHON_INLINE void __Pyx_RaiseCppGlobalNameError(const char *varname) {
+    PyErr_Format(PyExc_NameError, "C++ global '%s' is not initialized", varname);
+}
+
+//////////////// RaiseCppAttributeError.proto ///////////////////////
+static CYTHON_INLINE void __Pyx_RaiseCppAttributeError(const char *varname); /*proto*/
+
+/////////////// RaiseCppAttributeError //////////////////////////////
+static CYTHON_INLINE void __Pyx_RaiseCppAttributeError(const char *varname) {
+    PyErr_Format(PyExc_AttributeError, "C++ attribute '%s' is not initialized", varname);
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/Optimize.c b/contrib/tools/cython_py2/Cython/Utility/Optimize.c
new file mode 100644
index 00000000000..daa936dc83a
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Optimize.c
@@ -0,0 +1,1616 @@
+/*
+ * Optional optimisations of built-in functions and methods.
+ *
+ * Required replacements of builtins are in Builtins.c.
+ *
+ * General object operations and protocols are in ObjectHandling.c.
+ */
+
+/////////////// append.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_PyObject_Append(PyObject* L, PyObject* x); /*proto*/
+
+/////////////// append ///////////////
+//@requires: ListAppend
+//@requires: ObjectHandling.c::PyObjectCallMethod1
+
+static CYTHON_INLINE int __Pyx_PyObject_Append(PyObject* L, PyObject* x) {
+    if (likely(PyList_CheckExact(L))) {
+        if (unlikely(__Pyx_PyList_Append(L, x) < 0)) return -1;
+    } else {
+        PyObject* retval = __Pyx_PyObject_CallMethod1(L, PYIDENT("append"), x);
+        if (unlikely(!retval))
+            return -1;
+        Py_DECREF(retval);
+    }
+    return 0;
+}
+
+/////////////// ListAppend.proto ///////////////
+
+#if CYTHON_USE_PYLIST_INTERNALS && CYTHON_ASSUME_SAFE_MACROS
+static CYTHON_INLINE int __Pyx_PyList_Append(PyObject* list, PyObject* x) {
+    PyListObject* L = (PyListObject*) list;
+    Py_ssize_t len = Py_SIZE(list);
+    if (likely(L->allocated > len) & likely(len > (L->allocated >> 1))) {
+        Py_INCREF(x);
+        #if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030d0000
+        // In Py3.13a1, PyList_SET_ITEM() checks that the end index is lower than the current size.
+        // However, extending the size *before* setting the value would not be correct,
+        // so we cannot call PyList_SET_ITEM().
+        L->ob_item[len] = x;
+        #else
+        PyList_SET_ITEM(list, len, x);
+        #endif
+        __Pyx_SET_SIZE(list, len + 1);
+        return 0;
+    }
+    return PyList_Append(list, x);
+}
+#else
+#define __Pyx_PyList_Append(L,x) PyList_Append(L,x)
+#endif
+
+/////////////// ListCompAppend.proto ///////////////
+
+#if CYTHON_USE_PYLIST_INTERNALS && CYTHON_ASSUME_SAFE_MACROS
+static CYTHON_INLINE int __Pyx_ListComp_Append(PyObject* list, PyObject* x) {
+    PyListObject* L = (PyListObject*) list;
+    Py_ssize_t len = Py_SIZE(list);
+    if (likely(L->allocated > len)) {
+        Py_INCREF(x);
+        #if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030d0000
+        // In Py3.13a1, PyList_SET_ITEM() checks that the end index is lower than the current size.
+        // However, extending the size *before* setting the value would not be correct,
+        // so we cannot call PyList_SET_ITEM().
+        L->ob_item[len] = x;
+        #else
+        PyList_SET_ITEM(list, len, x);
+        #endif
+        __Pyx_SET_SIZE(list, len + 1);
+        return 0;
+    }
+    return PyList_Append(list, x);
+}
+#else
+#define __Pyx_ListComp_Append(L,x) PyList_Append(L,x)
+#endif
+
+//////////////////// ListExtend.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_PyList_Extend(PyObject* L, PyObject* v) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x030d0000
+    PyObject* none = _PyList_Extend((PyListObject*)L, v);
+    if (unlikely(!none))
+        return -1;
+    Py_DECREF(none);
+    return 0;
+#else
+    return PyList_SetSlice(L, PY_SSIZE_T_MAX, PY_SSIZE_T_MAX, v);
+#endif
+}
+
+/////////////// pop.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx__PyObject_Pop(PyObject* L); /*proto*/
+
+#if CYTHON_USE_PYLIST_INTERNALS && CYTHON_ASSUME_SAFE_MACROS
+static CYTHON_INLINE PyObject* __Pyx_PyList_Pop(PyObject* L); /*proto*/
+#define __Pyx_PyObject_Pop(L) (likely(PyList_CheckExact(L)) ? \
+    __Pyx_PyList_Pop(L) : __Pyx__PyObject_Pop(L))
+
+#else
+#define __Pyx_PyList_Pop(L)  __Pyx__PyObject_Pop(L)
+#define __Pyx_PyObject_Pop(L)  __Pyx__PyObject_Pop(L)
+#endif
+
+/////////////// pop ///////////////
+//@requires: ObjectHandling.c::PyObjectCallMethod0
+
+static CYTHON_INLINE PyObject* __Pyx__PyObject_Pop(PyObject* L) {
+    if (__Pyx_IS_TYPE(L, &PySet_Type)) {
+        return PySet_Pop(L);
+    }
+    return __Pyx_PyObject_CallMethod0(L, PYIDENT("pop"));
+}
+
+#if CYTHON_USE_PYLIST_INTERNALS && CYTHON_ASSUME_SAFE_MACROS
+static CYTHON_INLINE PyObject* __Pyx_PyList_Pop(PyObject* L) {
+    /* Check that both the size is positive and no reallocation shrinking needs to be done. */
+    if (likely(PyList_GET_SIZE(L) > (((PyListObject*)L)->allocated >> 1))) {
+        __Pyx_SET_SIZE(L, Py_SIZE(L) - 1);
+        return PyList_GET_ITEM(L, PyList_GET_SIZE(L));
+    }
+    return CALL_UNBOUND_METHOD(PyList_Type, "pop", L);
+}
+#endif
+
+
+/////////////// pop_index.proto ///////////////
+
+static PyObject* __Pyx__PyObject_PopNewIndex(PyObject* L, PyObject* py_ix); /*proto*/
+static PyObject* __Pyx__PyObject_PopIndex(PyObject* L, PyObject* py_ix); /*proto*/
+
+#if CYTHON_USE_PYLIST_INTERNALS && CYTHON_ASSUME_SAFE_MACROS
+static PyObject* __Pyx__PyList_PopIndex(PyObject* L, PyObject* py_ix, Py_ssize_t ix); /*proto*/
+
+#define __Pyx_PyObject_PopIndex(L, py_ix, ix, is_signed, type, to_py_func) ( \
+    (likely(PyList_CheckExact(L) && __Pyx_fits_Py_ssize_t(ix, type, is_signed))) ? \
+        __Pyx__PyList_PopIndex(L, py_ix, ix) : ( \
+        (unlikely((py_ix) == Py_None)) ? __Pyx__PyObject_PopNewIndex(L, to_py_func(ix)) : \
+            __Pyx__PyObject_PopIndex(L, py_ix)))
+
+#define __Pyx_PyList_PopIndex(L, py_ix, ix, is_signed, type, to_py_func) ( \
+    __Pyx_fits_Py_ssize_t(ix, type, is_signed) ? \
+        __Pyx__PyList_PopIndex(L, py_ix, ix) : ( \
+        (unlikely((py_ix) == Py_None)) ? __Pyx__PyObject_PopNewIndex(L, to_py_func(ix)) : \
+            __Pyx__PyObject_PopIndex(L, py_ix)))
+
+#else
+
+#define __Pyx_PyList_PopIndex(L, py_ix, ix, is_signed, type, to_py_func) \
+    __Pyx_PyObject_PopIndex(L, py_ix, ix, is_signed, type, to_py_func)
+
+#define __Pyx_PyObject_PopIndex(L, py_ix, ix, is_signed, type, to_py_func) ( \
+    (unlikely((py_ix) == Py_None)) ? __Pyx__PyObject_PopNewIndex(L, to_py_func(ix)) : \
+        __Pyx__PyObject_PopIndex(L, py_ix))
+#endif
+
+/////////////// pop_index ///////////////
+//@requires: ObjectHandling.c::PyObjectCallMethod1
+
+static PyObject* __Pyx__PyObject_PopNewIndex(PyObject* L, PyObject* py_ix) {
+    PyObject *r;
+    if (unlikely(!py_ix)) return NULL;
+    r = __Pyx__PyObject_PopIndex(L, py_ix);
+    Py_DECREF(py_ix);
+    return r;
+}
+
+static PyObject* __Pyx__PyObject_PopIndex(PyObject* L, PyObject* py_ix) {
+    return __Pyx_PyObject_CallMethod1(L, PYIDENT("pop"), py_ix);
+}
+
+#if CYTHON_USE_PYLIST_INTERNALS && CYTHON_ASSUME_SAFE_MACROS
+static PyObject* __Pyx__PyList_PopIndex(PyObject* L, PyObject* py_ix, Py_ssize_t ix) {
+    Py_ssize_t size = PyList_GET_SIZE(L);
+    if (likely(size > (((PyListObject*)L)->allocated >> 1))) {
+        Py_ssize_t cix = ix;
+        if (cix < 0) {
+            cix += size;
+        }
+        if (likely(__Pyx_is_valid_index(cix, size))) {
+            PyObject* v = PyList_GET_ITEM(L, cix);
+            __Pyx_SET_SIZE(L, Py_SIZE(L) - 1);
+            size -= 1;
+            memmove(&PyList_GET_ITEM(L, cix), &PyList_GET_ITEM(L, cix+1), (size_t)(size-cix)*sizeof(PyObject*));
+            return v;
+        }
+    }
+    if (py_ix == Py_None) {
+        return __Pyx__PyObject_PopNewIndex(L, PyInt_FromSsize_t(ix));
+    } else {
+        return __Pyx__PyObject_PopIndex(L, py_ix);
+    }
+}
+#endif
+
+
+/////////////// dict_getitem_default.proto ///////////////
+
+static PyObject* __Pyx_PyDict_GetItemDefault(PyObject* d, PyObject* key, PyObject* default_value); /*proto*/
+
+/////////////// dict_getitem_default ///////////////
+
+static PyObject* __Pyx_PyDict_GetItemDefault(PyObject* d, PyObject* key, PyObject* default_value) {
+    PyObject* value;
+#if PY_MAJOR_VERSION >= 3 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07020000)
+    value = PyDict_GetItemWithError(d, key);
+    if (unlikely(!value)) {
+        if (unlikely(PyErr_Occurred()))
+            return NULL;
+        value = default_value;
+    }
+    Py_INCREF(value);
+    // avoid C compiler warning about unused utility functions
+    if ((1));
+#else
+    if (PyString_CheckExact(key) || PyUnicode_CheckExact(key) || PyInt_CheckExact(key)) {
+        /* these presumably have safe hash functions */
+        value = PyDict_GetItem(d, key);
+        if (unlikely(!value)) {
+            value = default_value;
+        }
+        Py_INCREF(value);
+    }
+#endif
+    else {
+        if (default_value == Py_None)
+            value = CALL_UNBOUND_METHOD(PyDict_Type, "get", d, key);
+        else
+            value = CALL_UNBOUND_METHOD(PyDict_Type, "get", d, key, default_value);
+    }
+    return value;
+}
+
+
+/////////////// dict_setdefault.proto ///////////////
+
+static CYTHON_INLINE PyObject *__Pyx_PyDict_SetDefault(PyObject *d, PyObject *key, PyObject *default_value, int is_safe_type); /*proto*/
+
+/////////////// dict_setdefault ///////////////
+
+static CYTHON_INLINE PyObject *__Pyx_PyDict_SetDefault(PyObject *d, PyObject *key, PyObject *default_value,
+                                                       int is_safe_type) {
+    PyObject* value;
+    CYTHON_MAYBE_UNUSED_VAR(is_safe_type);
+#if PY_VERSION_HEX >= 0x030400A0
+    // we keep the method call at the end to avoid "unused" C compiler warnings
+    if ((1)) {
+        value = PyDict_SetDefault(d, key, default_value);
+        if (unlikely(!value)) return NULL;
+        Py_INCREF(value);
+#else
+    if (is_safe_type == 1 || (is_safe_type == -1 &&
+        /* the following builtins presumably have repeatably safe and fast hash functions */
+#if PY_MAJOR_VERSION >= 3 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM >= 0x07020000)
+            (PyUnicode_CheckExact(key) || PyString_CheckExact(key) || PyLong_CheckExact(key)))) {
+        value = PyDict_GetItemWithError(d, key);
+        if (unlikely(!value)) {
+            if (unlikely(PyErr_Occurred()))
+                return NULL;
+            if (unlikely(PyDict_SetItem(d, key, default_value) == -1))
+                return NULL;
+            value = default_value;
+        }
+        Py_INCREF(value);
+#else
+            (PyString_CheckExact(key) || PyUnicode_CheckExact(key) || PyInt_CheckExact(key) || PyLong_CheckExact(key)))) {
+        value = PyDict_GetItem(d, key);
+        if (unlikely(!value)) {
+            if (unlikely(PyDict_SetItem(d, key, default_value) == -1))
+                return NULL;
+            value = default_value;
+        }
+        Py_INCREF(value);
+#endif
+#endif
+    } else {
+        value = CALL_UNBOUND_METHOD(PyDict_Type, "setdefault", d, key, default_value);
+    }
+    return value;
+}
+
+
+/////////////// py_dict_clear.proto ///////////////
+
+#define __Pyx_PyDict_Clear(d) (PyDict_Clear(d), 0)
+
+
+/////////////// py_dict_pop.proto ///////////////
+
+static CYTHON_INLINE PyObject *__Pyx_PyDict_Pop(PyObject *d, PyObject *key, PyObject *default_value); /*proto*/
+
+/////////////// py_dict_pop ///////////////
+
+static CYTHON_INLINE PyObject *__Pyx_PyDict_Pop(PyObject *d, PyObject *key, PyObject *default_value) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX > 0x030600B3 & PY_VERSION_HEX < 0x030d0000
+    if ((1)) {
+        return _PyDict_Pop(d, key, default_value);
+    } else
+    // avoid "function unused" warnings
+#endif
+    if (default_value) {
+        return CALL_UNBOUND_METHOD(PyDict_Type, "pop", d, key, default_value);
+    } else {
+        return CALL_UNBOUND_METHOD(PyDict_Type, "pop", d, key);
+    }
+}
+
+
+/////////////// dict_iter.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_dict_iterator(PyObject* dict, int is_dict, PyObject* method_name,
+                                                   Py_ssize_t* p_orig_length, int* p_is_dict);
+static CYTHON_INLINE int __Pyx_dict_iter_next(PyObject* dict_or_iter, Py_ssize_t orig_length, Py_ssize_t* ppos,
+                                              PyObject** pkey, PyObject** pvalue, PyObject** pitem, int is_dict);
+
+/////////////// dict_iter ///////////////
+//@requires: ObjectHandling.c::UnpackTuple2
+//@requires: ObjectHandling.c::IterFinish
+//@requires: ObjectHandling.c::PyObjectCallMethod0
+
+#if CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
+#include <string.h>
+#endif
+
+static CYTHON_INLINE PyObject* __Pyx_dict_iterator(PyObject* iterable, int is_dict, PyObject* method_name,
+                                                   Py_ssize_t* p_orig_length, int* p_source_is_dict) {
+    is_dict = is_dict || likely(PyDict_CheckExact(iterable));
+    *p_source_is_dict = is_dict;
+    if (is_dict) {
+#if !CYTHON_COMPILING_IN_PYPY
+        *p_orig_length = PyDict_Size(iterable);
+        Py_INCREF(iterable);
+        return iterable;
+#elif PY_MAJOR_VERSION >= 3
+        // On PyPy3, we need to translate manually a few method names.
+        // This logic is not needed on CPython thanks to the fast case above.
+        static PyObject *py_items = NULL, *py_keys = NULL, *py_values = NULL;
+        PyObject **pp = NULL;
+        if (method_name) {
+            const char *name = PyUnicode_AsUTF8(method_name);
+            if (strcmp(name, "iteritems") == 0) pp = &py_items;
+            else if (strcmp(name, "iterkeys") == 0) pp = &py_keys;
+            else if (strcmp(name, "itervalues") == 0) pp = &py_values;
+            if (pp) {
+                if (!*pp) {
+                    *pp = PyUnicode_FromString(name + 4);
+                    if (!*pp)
+                        return NULL;
+                }
+                method_name = *pp;
+            }
+        }
+#endif
+    }
+    *p_orig_length = 0;
+    if (method_name) {
+        PyObject* iter;
+        iterable = __Pyx_PyObject_CallMethod0(iterable, method_name);
+        if (!iterable)
+            return NULL;
+#if !CYTHON_COMPILING_IN_PYPY
+        if (PyTuple_CheckExact(iterable) || PyList_CheckExact(iterable))
+            return iterable;
+#endif
+        iter = PyObject_GetIter(iterable);
+        Py_DECREF(iterable);
+        return iter;
+    }
+    return PyObject_GetIter(iterable);
+}
+
+static CYTHON_INLINE int __Pyx_dict_iter_next(
+        PyObject* iter_obj, CYTHON_NCP_UNUSED Py_ssize_t orig_length, CYTHON_NCP_UNUSED Py_ssize_t* ppos,
+        PyObject** pkey, PyObject** pvalue, PyObject** pitem, int source_is_dict) {
+    PyObject* next_item;
+#if !CYTHON_COMPILING_IN_PYPY
+    if (source_is_dict) {
+        PyObject *key, *value;
+        if (unlikely(orig_length != PyDict_Size(iter_obj))) {
+            PyErr_SetString(PyExc_RuntimeError, "dictionary changed size during iteration");
+            return -1;
+        }
+        if (unlikely(!PyDict_Next(iter_obj, ppos, &key, &value))) {
+            return 0;
+        }
+        if (pitem) {
+            PyObject* tuple = PyTuple_New(2);
+            if (unlikely(!tuple)) {
+                return -1;
+            }
+            Py_INCREF(key);
+            Py_INCREF(value);
+            PyTuple_SET_ITEM(tuple, 0, key);
+            PyTuple_SET_ITEM(tuple, 1, value);
+            *pitem = tuple;
+        } else {
+            if (pkey) {
+                Py_INCREF(key);
+                *pkey = key;
+            }
+            if (pvalue) {
+                Py_INCREF(value);
+                *pvalue = value;
+            }
+        }
+        return 1;
+    } else if (PyTuple_CheckExact(iter_obj)) {
+        Py_ssize_t pos = *ppos;
+        if (unlikely(pos >= PyTuple_GET_SIZE(iter_obj))) return 0;
+        *ppos = pos + 1;
+        next_item = PyTuple_GET_ITEM(iter_obj, pos);
+        Py_INCREF(next_item);
+    } else if (PyList_CheckExact(iter_obj)) {
+        Py_ssize_t pos = *ppos;
+        if (unlikely(pos >= PyList_GET_SIZE(iter_obj))) return 0;
+        *ppos = pos + 1;
+        next_item = PyList_GET_ITEM(iter_obj, pos);
+        Py_INCREF(next_item);
+    } else
+#endif
+    {
+        next_item = PyIter_Next(iter_obj);
+        if (unlikely(!next_item)) {
+            return __Pyx_IterFinish();
+        }
+    }
+    if (pitem) {
+        *pitem = next_item;
+    } else if (pkey && pvalue) {
+        if (__Pyx_unpack_tuple2(next_item, pkey, pvalue, source_is_dict, source_is_dict, 1))
+            return -1;
+    } else if (pkey) {
+        *pkey = next_item;
+    } else {
+        *pvalue = next_item;
+    }
+    return 1;
+}
+
+
+/////////////// set_iter.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_set_iterator(PyObject* iterable, int is_set,
+                                                  Py_ssize_t* p_orig_length, int* p_source_is_set); /*proto*/
+static CYTHON_INLINE int __Pyx_set_iter_next(
+        PyObject* iter_obj, Py_ssize_t orig_length,
+        Py_ssize_t* ppos, PyObject **value,
+        int source_is_set); /*proto*/
+
+/////////////// set_iter ///////////////
+//@requires: ObjectHandling.c::IterFinish
+
+static CYTHON_INLINE PyObject* __Pyx_set_iterator(PyObject* iterable, int is_set,
+                                                  Py_ssize_t* p_orig_length, int* p_source_is_set) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x030d0000
+    is_set = is_set || likely(PySet_CheckExact(iterable) || PyFrozenSet_CheckExact(iterable));
+    *p_source_is_set = is_set;
+    if (likely(is_set)) {
+        *p_orig_length = PySet_Size(iterable);
+        Py_INCREF(iterable);
+        return iterable;
+    }
+#else
+    CYTHON_UNUSED_VAR(is_set);
+    *p_source_is_set = 0;
+#endif
+    *p_orig_length = 0;
+    return PyObject_GetIter(iterable);
+}
+
+static CYTHON_INLINE int __Pyx_set_iter_next(
+        PyObject* iter_obj, Py_ssize_t orig_length,
+        Py_ssize_t* ppos, PyObject **value,
+        int source_is_set) {
+    if (!CYTHON_COMPILING_IN_CPYTHON || PY_VERSION_HEX >= 0x030d0000 || unlikely(!source_is_set)) {
+        *value = PyIter_Next(iter_obj);
+        if (unlikely(!*value)) {
+            return __Pyx_IterFinish();
+        }
+        CYTHON_UNUSED_VAR(orig_length);
+        CYTHON_UNUSED_VAR(ppos);
+        return 1;
+    }
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x030d0000
+    if (unlikely(PySet_GET_SIZE(iter_obj) != orig_length)) {
+        PyErr_SetString(
+            PyExc_RuntimeError,
+            "set changed size during iteration");
+        return -1;
+    }
+    {
+        Py_hash_t hash;
+        int ret = _PySet_NextEntry(iter_obj, ppos, value, &hash);
+        // CPython does not raise errors here, only if !isinstance(iter_obj, set/frozenset)
+        assert (ret != -1);
+        if (likely(ret)) {
+            Py_INCREF(*value);
+            return 1;
+        }
+    }
+#endif
+    return 0;
+}
+
+/////////////// py_set_discard_unhashable ///////////////
+//@requires: Builtins.c::pyfrozenset_new
+
+static int __Pyx_PySet_DiscardUnhashable(PyObject *set, PyObject *key) {
+    PyObject *tmpkey;
+    int rv;
+
+    if (likely(!PySet_Check(key) || !PyErr_ExceptionMatches(PyExc_TypeError)))
+        return -1;
+    PyErr_Clear();
+    tmpkey = __Pyx_PyFrozenSet_New(key);
+    if (tmpkey == NULL)
+        return -1;
+    rv = PySet_Discard(set, tmpkey);
+    Py_DECREF(tmpkey);
+    return rv;
+}
+
+
+/////////////// py_set_discard.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_PySet_Discard(PyObject *set, PyObject *key); /*proto*/
+
+/////////////// py_set_discard ///////////////
+//@requires: py_set_discard_unhashable
+
+static CYTHON_INLINE int __Pyx_PySet_Discard(PyObject *set, PyObject *key) {
+    int found = PySet_Discard(set, key);
+    // Convert *key* to frozenset if necessary
+    if (unlikely(found < 0)) {
+        found = __Pyx_PySet_DiscardUnhashable(set, key);
+    }
+    // note: returns -1 on error, 0 (not found) or 1 (found) otherwise => error check for -1 or < 0 works
+    return found;
+}
+
+
+/////////////// py_set_remove.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_PySet_Remove(PyObject *set, PyObject *key); /*proto*/
+
+/////////////// py_set_remove ///////////////
+//@requires: py_set_discard_unhashable
+
+static int __Pyx_PySet_RemoveNotFound(PyObject *set, PyObject *key, int found) {
+    // Convert *key* to frozenset if necessary
+    if (unlikely(found < 0)) {
+        found = __Pyx_PySet_DiscardUnhashable(set, key);
+    }
+    if (likely(found == 0)) {
+        // Not found
+        PyObject *tup;
+        tup = PyTuple_Pack(1, key);
+        if (!tup)
+            return -1;
+        PyErr_SetObject(PyExc_KeyError, tup);
+        Py_DECREF(tup);
+        return -1;
+    }
+    // note: returns -1 on error, 0 (not found) or 1 (found) otherwise => error check for -1 or < 0 works
+    return found;
+}
+
+static CYTHON_INLINE int __Pyx_PySet_Remove(PyObject *set, PyObject *key) {
+    int found = PySet_Discard(set, key);
+    if (unlikely(found != 1)) {
+        // note: returns -1 on error, 0 (not found) or 1 (found) otherwise => error check for -1 or < 0 works
+        return __Pyx_PySet_RemoveNotFound(set, key, found);
+    }
+    return 0;
+}
+
+
+/////////////// unicode_iter.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_init_unicode_iteration(
+    PyObject* ustring, Py_ssize_t *length, void** data, int *kind); /* proto */
+
+/////////////// unicode_iter ///////////////
+
+static CYTHON_INLINE int __Pyx_init_unicode_iteration(
+    PyObject* ustring, Py_ssize_t *length, void** data, int *kind) {
+#if CYTHON_COMPILING_IN_LIMITED_API
+    // In the limited API we just point data to the unicode object
+    *kind   = 0;
+    *length = PyUnicode_GetLength(ustring);
+    *data   = (void*)ustring;
+#elif CYTHON_PEP393_ENABLED
+    if (unlikely(__Pyx_PyUnicode_READY(ustring) < 0)) return -1;
+    *kind   = PyUnicode_KIND(ustring);
+    *length = PyUnicode_GET_LENGTH(ustring);
+    *data   = PyUnicode_DATA(ustring);
+#else
+    *kind   = 0;
+    *length = PyUnicode_GET_SIZE(ustring);
+    *data   = (void*)PyUnicode_AS_UNICODE(ustring);
+#endif
+    return 0;
+}
+
+/////////////// pyobject_as_double.proto ///////////////
+
+static double __Pyx__PyObject_AsDouble(PyObject* obj); /* proto */
+
+#if CYTHON_COMPILING_IN_PYPY
+#define __Pyx_PyObject_AsDouble(obj) \
+(likely(PyFloat_CheckExact(obj)) ? PyFloat_AS_DOUBLE(obj) : \
+ likely(PyInt_CheckExact(obj)) ? \
+ PyFloat_AsDouble(obj) : __Pyx__PyObject_AsDouble(obj))
+#else
+#define __Pyx_PyObject_AsDouble(obj) \
+((likely(PyFloat_CheckExact(obj))) ?  PyFloat_AS_DOUBLE(obj) : \
+ likely(PyLong_CheckExact(obj)) ? \
+ PyLong_AsDouble(obj) : __Pyx__PyObject_AsDouble(obj))
+#endif
+
+/////////////// pyobject_as_double ///////////////
+//@requires: pybytes_as_double
+//@requires: pyunicode_as_double
+//@requires: ObjectHandling.c::PyObjectCallOneArg
+
+static double __Pyx__PyObject_AsDouble(PyObject* obj) {
+    if (PyUnicode_CheckExact(obj)) {
+        return __Pyx_PyUnicode_AsDouble(obj);
+    } else if (PyBytes_CheckExact(obj)) {
+        return __Pyx_PyBytes_AsDouble(obj);
+    } else if (PyByteArray_CheckExact(obj)) {
+        return __Pyx_PyByteArray_AsDouble(obj);
+    } else {
+        PyObject* float_value;
+#if !CYTHON_USE_TYPE_SLOTS
+        float_value = PyNumber_Float(obj);  if ((0)) goto bad;
+        // avoid "unused" warnings
+        (void)__Pyx_PyObject_CallOneArg;
+#else
+        PyNumberMethods *nb = Py_TYPE(obj)->tp_as_number;
+        if (likely(nb) && likely(nb->nb_float)) {
+            float_value = nb->nb_float(obj);
+            if (likely(float_value) && unlikely(!PyFloat_Check(float_value))) {
+                __Pyx_TypeName float_value_type_name = __Pyx_PyType_GetName(Py_TYPE(float_value));
+                PyErr_Format(PyExc_TypeError,
+                    "__float__ returned non-float (type " __Pyx_FMT_TYPENAME ")",
+                    float_value_type_name);
+                __Pyx_DECREF_TypeName(float_value_type_name);
+                Py_DECREF(float_value);
+                goto bad;
+            }
+        } else {
+            float_value = __Pyx_PyObject_CallOneArg((PyObject*)&PyFloat_Type, obj);
+        }
+#endif
+        if (likely(float_value)) {
+            double value = PyFloat_AS_DOUBLE(float_value);
+            Py_DECREF(float_value);
+            return value;
+        }
+    }
+bad:
+    return (double)-1;
+}
+
+
+/////////////// pystring_as_double.proto ///////////////
+//@requires: pyunicode_as_double
+//@requires: pybytes_as_double
+
+static CYTHON_INLINE double __Pyx_PyString_AsDouble(PyObject *obj) {
+    #if PY_MAJOR_VERSION >= 3
+    (void)__Pyx_PyBytes_AsDouble;
+    return __Pyx_PyUnicode_AsDouble(obj);
+    #else
+    (void)__Pyx_PyUnicode_AsDouble;
+    return __Pyx_PyBytes_AsDouble(obj);
+    #endif
+}
+
+
+/////////////// pyunicode_as_double.proto ///////////////
+
+static CYTHON_INLINE double __Pyx_PyUnicode_AsDouble(PyObject *obj);/*proto*/
+
+/////////////// pyunicode_as_double.proto ///////////////
+//@requires: pybytes_as_double
+
+#if PY_MAJOR_VERSION >= 3 && !CYTHON_COMPILING_IN_PYPY && CYTHON_ASSUME_SAFE_MACROS
+static const char* __Pyx__PyUnicode_AsDouble_Copy(const void* data, const int kind, char* buffer, Py_ssize_t start, Py_ssize_t end) {
+    int last_was_punctuation;
+    Py_ssize_t i;
+    // number must not start with punctuation
+    last_was_punctuation = 1;
+    for (i=start; i <= end; i++) {
+        Py_UCS4 chr = PyUnicode_READ(kind, data, i);
+        int is_punctuation = (chr == '_') | (chr == '.');
+        *buffer = (char)chr;
+        // reject sequences of '_' and '.'
+        buffer += (chr != '_');
+        if (unlikely(chr > 127)) goto parse_failure;
+        if (unlikely(last_was_punctuation & is_punctuation)) goto parse_failure;
+        last_was_punctuation = is_punctuation;
+    }
+    if (unlikely(last_was_punctuation)) goto parse_failure;
+    *buffer = '\0';
+    return buffer;
+
+parse_failure:
+    return NULL;
+}
+
+static double __Pyx__PyUnicode_AsDouble_inf_nan(const void* data, int kind, Py_ssize_t start, Py_ssize_t length) {
+    int matches = 1;
+    Py_UCS4 chr;
+    Py_UCS4 sign = PyUnicode_READ(kind, data, start);
+    int is_signed = (sign == '-') | (sign == '+');
+    start += is_signed;
+    length -= is_signed;
+
+    switch (PyUnicode_READ(kind, data, start)) {
+        #ifdef Py_NAN
+        case 'n':
+        case 'N':
+            if (unlikely(length != 3)) goto parse_failure;
+            chr = PyUnicode_READ(kind, data, start+1);
+            matches &= (chr == 'a') | (chr == 'A');
+            chr = PyUnicode_READ(kind, data, start+2);
+            matches &= (chr == 'n') | (chr == 'N');
+            if (unlikely(!matches)) goto parse_failure;
+            return (sign == '-') ? -Py_NAN : Py_NAN;
+        #endif
+        case 'i':
+        case 'I':
+            if (unlikely(length < 3)) goto parse_failure;
+            chr = PyUnicode_READ(kind, data, start+1);
+            matches &= (chr == 'n') | (chr == 'N');
+            chr = PyUnicode_READ(kind, data, start+2);
+            matches &= (chr == 'f') | (chr == 'F');
+            if (likely(length == 3 && matches))
+                return (sign == '-') ? -Py_HUGE_VAL : Py_HUGE_VAL;
+            if (unlikely(length != 8)) goto parse_failure;
+            chr = PyUnicode_READ(kind, data, start+3);
+            matches &= (chr == 'i') | (chr == 'I');
+            chr = PyUnicode_READ(kind, data, start+4);
+            matches &= (chr == 'n') | (chr == 'N');
+            chr = PyUnicode_READ(kind, data, start+5);
+            matches &= (chr == 'i') | (chr == 'I');
+            chr = PyUnicode_READ(kind, data, start+6);
+            matches &= (chr == 't') | (chr == 'T');
+            chr = PyUnicode_READ(kind, data, start+7);
+            matches &= (chr == 'y') | (chr == 'Y');
+            if (unlikely(!matches)) goto parse_failure;
+            return (sign == '-') ? -Py_HUGE_VAL : Py_HUGE_VAL;
+        case '.': case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9':
+            break;
+        default:
+            goto parse_failure;
+    }
+    return 0.0;
+parse_failure:
+    return -1.0;
+}
+
+static double __Pyx_PyUnicode_AsDouble_WithSpaces(PyObject *obj) {
+    double value;
+    const char *last;
+    char *end;
+    Py_ssize_t start, length = PyUnicode_GET_LENGTH(obj);
+    const int kind = PyUnicode_KIND(obj);
+    const void* data = PyUnicode_DATA(obj);
+
+    // strip spaces at start and end
+    start = 0;
+    while (Py_UNICODE_ISSPACE(PyUnicode_READ(kind, data, start)))
+        start++;
+    while (start < length - 1 && Py_UNICODE_ISSPACE(PyUnicode_READ(kind, data, length - 1)))
+        length--;
+    length -= start;
+    if (unlikely(length <= 0)) goto fallback;
+
+    // parse NaN / inf
+    value = __Pyx__PyUnicode_AsDouble_inf_nan(data, kind, start, length);
+    if (unlikely(value == -1.0)) goto fallback;
+    if (value != 0.0) return value;
+
+    if (length < 40) {
+        char number[40];
+        last = __Pyx__PyUnicode_AsDouble_Copy(data, kind, number, start, start + length);
+        if (unlikely(!last)) goto fallback;
+        value = PyOS_string_to_double(number, &end, NULL);
+    } else {
+        char *number = (char*) PyMem_Malloc((length + 1) * sizeof(char));
+        if (unlikely(!number)) goto fallback;
+        last = __Pyx__PyUnicode_AsDouble_Copy(data, kind, number, start, start + length);
+        if (unlikely(!last)) {
+            PyMem_Free(number);
+            goto fallback;
+        }
+        value = PyOS_string_to_double(number, &end, NULL);
+        PyMem_Free(number);
+    }
+    if (likely(end == last) || (value == (double)-1 && PyErr_Occurred())) {
+        return value;
+    }
+fallback:
+    return __Pyx_SlowPyString_AsDouble(obj);
+}
+#endif
+
+static CYTHON_INLINE double __Pyx_PyUnicode_AsDouble(PyObject *obj) {
+    // Currently not optimised for Py2.7.
+#if PY_MAJOR_VERSION >= 3 && !CYTHON_COMPILING_IN_PYPY && CYTHON_ASSUME_SAFE_MACROS
+    if (unlikely(__Pyx_PyUnicode_READY(obj) == -1))
+        return (double)-1;
+    if (likely(PyUnicode_IS_ASCII(obj))) {
+        const char *s;
+        Py_ssize_t length;
+        s = PyUnicode_AsUTF8AndSize(obj, &length);
+        return __Pyx__PyBytes_AsDouble(obj, s, length);
+    }
+    return __Pyx_PyUnicode_AsDouble_WithSpaces(obj);
+#else
+    return __Pyx_SlowPyString_AsDouble(obj);
+#endif
+}
+
+
+/////////////// pybytes_as_double.proto ///////////////
+
+static double __Pyx_SlowPyString_AsDouble(PyObject *obj);/*proto*/
+static double __Pyx__PyBytes_AsDouble(PyObject *obj, const char* start, Py_ssize_t length);/*proto*/
+
+static CYTHON_INLINE double __Pyx_PyBytes_AsDouble(PyObject *obj) {
+    char* as_c_string;
+    Py_ssize_t size;
+#if CYTHON_ASSUME_SAFE_MACROS
+    as_c_string = PyBytes_AS_STRING(obj);
+    size = PyBytes_GET_SIZE(obj);
+#else
+    if (PyBytes_AsStringAndSize(obj, &as_c_string, &size) < 0) {
+        return (double)-1;
+    }
+#endif
+    return __Pyx__PyBytes_AsDouble(obj, as_c_string, size);
+}
+static CYTHON_INLINE double __Pyx_PyByteArray_AsDouble(PyObject *obj) {
+    char* as_c_string;
+    Py_ssize_t size;
+#if CYTHON_ASSUME_SAFE_MACROS
+    as_c_string = PyByteArray_AS_STRING(obj);
+    size = PyByteArray_GET_SIZE(obj);
+#else
+    as_c_string = PyByteArray_AsString(obj);
+    if (as_c_string == NULL) {
+        return (double)-1;
+    }
+    size = PyByteArray_Size(obj);
+#endif
+    return __Pyx__PyBytes_AsDouble(obj, as_c_string, size);
+}
+
+
+/////////////// pybytes_as_double ///////////////
+
+static double __Pyx_SlowPyString_AsDouble(PyObject *obj) {
+    PyObject *float_value;
+#if PY_MAJOR_VERSION >= 3
+    float_value = PyFloat_FromString(obj);
+#else
+    float_value = PyFloat_FromString(obj, 0);
+#endif
+    if (likely(float_value)) {
+#if CYTHON_ASSUME_SAFE_MACROS
+        double value = PyFloat_AS_DOUBLE(float_value);
+#else
+        double value = PyFloat_AsDouble(float_value);
+#endif
+        Py_DECREF(float_value);
+        return value;
+    }
+    return (double)-1;
+}
+
+static const char* __Pyx__PyBytes_AsDouble_Copy(const char* start, char* buffer, Py_ssize_t length) {
+    // number must not start with punctuation
+    int last_was_punctuation = 1;
+    Py_ssize_t i;
+    for (i=0; i < length; i++) {
+        char chr = start[i];
+        int is_punctuation = (chr == '_') | (chr == '.') | (chr == 'e') | (chr == 'E');
+        *buffer = chr;
+        buffer += (chr != '_');
+        // reject sequences of '_' and '.'
+        if (unlikely(last_was_punctuation & is_punctuation)) goto parse_failure;
+        last_was_punctuation = is_punctuation;
+    }
+    if (unlikely(last_was_punctuation)) goto parse_failure;
+    *buffer = '\0';
+    return buffer;
+
+parse_failure:
+    return NULL;
+}
+
+static double __Pyx__PyBytes_AsDouble_inf_nan(const char* start, Py_ssize_t length) {
+    int matches = 1;
+    char sign = start[0];
+    int is_signed = (sign == '+') | (sign == '-');
+    start += is_signed;
+    length -= is_signed;
+
+    switch (start[0]) {
+        #ifdef Py_NAN
+        case 'n':
+        case 'N':
+            if (unlikely(length != 3)) goto parse_failure;
+            matches &= (start[1] == 'a' || start[1] == 'A');
+            matches &= (start[2] == 'n' || start[2] == 'N');
+            if (unlikely(!matches)) goto parse_failure;
+            return (sign == '-') ? -Py_NAN : Py_NAN;
+        #endif
+        case 'i':
+        case 'I':
+            if (unlikely(length < 3)) goto parse_failure;
+            matches &= (start[1] == 'n' || start[1] == 'N');
+            matches &= (start[2] == 'f' || start[2] == 'F');
+            if (likely(length == 3 && matches))
+                return (sign == '-') ? -Py_HUGE_VAL : Py_HUGE_VAL;
+            if (unlikely(length != 8)) goto parse_failure;
+            matches &= (start[3] == 'i' || start[3] == 'I');
+            matches &= (start[4] == 'n' || start[4] == 'N');
+            matches &= (start[5] == 'i' || start[5] == 'I');
+            matches &= (start[6] == 't' || start[6] == 'T');
+            matches &= (start[7] == 'y' || start[7] == 'Y');
+            if (unlikely(!matches)) goto parse_failure;
+            return (sign == '-') ? -Py_HUGE_VAL : Py_HUGE_VAL;
+        case '.': case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9':
+            break;
+        default:
+            goto parse_failure;
+    }
+    return 0.0;
+parse_failure:
+    return -1.0;
+}
+
+static CYTHON_INLINE int __Pyx__PyBytes_AsDouble_IsSpace(char ch) {
+    // see Py_ISSPACE() in CPython
+    // https://github.com/python/cpython/blob/master/Python/pyctype.c
+    return (ch == 0x20) | !((ch < 0x9) | (ch > 0xd));
+}
+
+CYTHON_UNUSED static double __Pyx__PyBytes_AsDouble(PyObject *obj, const char* start, Py_ssize_t length) {
+    double value;
+    Py_ssize_t i, digits;
+    const char *last = start + length;
+    char *end;
+
+    // strip spaces at start and end
+    while (__Pyx__PyBytes_AsDouble_IsSpace(*start))
+        start++;
+    while (start < last - 1 && __Pyx__PyBytes_AsDouble_IsSpace(last[-1]))
+        last--;
+    length = last - start;
+    if (unlikely(length <= 0)) goto fallback;
+
+    // parse NaN / inf
+    value = __Pyx__PyBytes_AsDouble_inf_nan(start, length);
+    if (unlikely(value == -1.0)) goto fallback;
+    if (value != 0.0) return value;
+
+    // look for underscores
+    digits = 0;
+    for (i=0; i < length; digits += start[i++] != '_');
+
+    if (likely(digits == length)) {
+        value = PyOS_string_to_double(start, &end, NULL);
+    } else if (digits < 40) {
+        char number[40];
+        last = __Pyx__PyBytes_AsDouble_Copy(start, number, length);
+        if (unlikely(!last)) goto fallback;
+        value = PyOS_string_to_double(number, &end, NULL);
+    } else {
+        char *number = (char*) PyMem_Malloc((digits + 1) * sizeof(char));
+        if (unlikely(!number)) goto fallback;
+        last = __Pyx__PyBytes_AsDouble_Copy(start, number, length);
+        if (unlikely(!last)) {
+            PyMem_Free(number);
+            goto fallback;
+        }
+        value = PyOS_string_to_double(number, &end, NULL);
+        PyMem_Free(number);
+    }
+    if (likely(end == last) || (value == (double)-1 && PyErr_Occurred())) {
+        return value;
+    }
+fallback:
+    return __Pyx_SlowPyString_AsDouble(obj);
+}
+
+
+/////////////// PyNumberPow2.proto ///////////////
+
+#define __Pyx_PyNumber_InPlacePowerOf2(a, b, c) __Pyx__PyNumber_PowerOf2(a, b, c, 1)
+#define __Pyx_PyNumber_PowerOf2(a, b, c) __Pyx__PyNumber_PowerOf2(a, b, c, 0)
+
+static PyObject* __Pyx__PyNumber_PowerOf2(PyObject *two, PyObject *exp, PyObject *none, int inplace); /*proto*/
+
+/////////////// PyNumberPow2 ///////////////
+
+static PyObject* __Pyx__PyNumber_PowerOf2(PyObject *two, PyObject *exp, PyObject *none, int inplace) {
+// in CPython, 1<<N is substantially faster than 2**N
+// see https://bugs.python.org/issue21420
+#if !CYTHON_COMPILING_IN_PYPY
+    Py_ssize_t shiftby;
+#if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_CheckExact(exp))) {
+        shiftby = PyInt_AS_LONG(exp);
+    } else
+#endif
+    if (likely(PyLong_CheckExact(exp))) {
+        #if CYTHON_USE_PYLONG_INTERNALS
+        if (__Pyx_PyLong_IsZero(exp)) {
+            return PyInt_FromLong(1L);
+        } else if (__Pyx_PyLong_IsNeg(exp)) {
+            goto fallback;
+        } else if (__Pyx_PyLong_IsCompact(exp)) {
+            shiftby = __Pyx_PyLong_CompactValueUnsigned(exp);
+        } else {
+            shiftby = PyLong_AsSsize_t(exp);
+        }
+        #else
+        shiftby = PyLong_AsSsize_t(exp);
+        #endif
+    } else {
+        goto fallback;
+    }
+    if (likely(shiftby >= 0)) {
+        if ((size_t)shiftby <= sizeof(long) * 8 - 2) {
+            long value = 1L << shiftby;
+            return PyInt_FromLong(value);
+#ifdef HAVE_LONG_LONG
+        } else if ((size_t)shiftby <= sizeof(unsigned PY_LONG_LONG) * 8 - 1) {
+            unsigned PY_LONG_LONG value = ((unsigned PY_LONG_LONG)1) << shiftby;
+            return PyLong_FromUnsignedLongLong(value);
+#endif
+        } else {
+            PyObject *result, *one = PyInt_FromLong(1L);
+            if (unlikely(!one)) return NULL;
+            result = PyNumber_Lshift(one, exp);
+            Py_DECREF(one);
+            return result;
+        }
+    } else if (shiftby == -1 && PyErr_Occurred()) {
+        PyErr_Clear();
+    }
+fallback:
+#endif
+    return (inplace ? PyNumber_InPlacePower : PyNumber_Power)(two, exp, none);
+}
+
+
+/////////////// PyIntCompare.proto ///////////////
+
+{{py: c_ret_type = 'PyObject*' if ret_type.is_pyobject else 'int'}}
+static CYTHON_INLINE {{c_ret_type}} __Pyx_PyInt_{{'' if ret_type.is_pyobject else 'Bool'}}{{op}}{{order}}(PyObject *op1, PyObject *op2, long intval, long inplace); /*proto*/
+
+/////////////// PyIntCompare ///////////////
+
+{{py: pyval, ival = ('op2', 'b') if order == 'CObj' else ('op1', 'a') }}
+{{py: c_ret_type = 'PyObject*' if ret_type.is_pyobject else 'int'}}
+{{py: return_true = 'Py_RETURN_TRUE' if ret_type.is_pyobject else 'return 1'}}
+{{py: return_false = 'Py_RETURN_FALSE' if ret_type.is_pyobject else 'return 0'}}
+{{py: slot_name = op.lower() }}
+{{py: c_op = {'Eq': '==', 'Ne': '!='}[op] }}
+{{py:
+return_compare = (
+    (lambda a,b,c_op, return_true=return_true, return_false=return_false: "if ({a} {c_op} {b}) {return_true}; else {return_false};".format(
+        a=a, b=b, c_op=c_op, return_true=return_true, return_false=return_false))
+    if ret_type.is_pyobject else
+    (lambda a,b,c_op: "return ({a} {c_op} {b});".format(a=a, b=b, c_op=c_op))
+    )
+}}
+
+static CYTHON_INLINE {{c_ret_type}} __Pyx_PyInt_{{'' if ret_type.is_pyobject else 'Bool'}}{{op}}{{order}}(PyObject *op1, PyObject *op2, long intval, long inplace) {
+    CYTHON_MAYBE_UNUSED_VAR(intval);
+    CYTHON_UNUSED_VAR(inplace);
+    if (op1 == op2) {
+        {{return_true if op == 'Eq' else return_false}};
+    }
+
+    #if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_CheckExact({{pyval}}))) {
+        const long {{'a' if order == 'CObj' else 'b'}} = intval;
+        long {{ival}} = PyInt_AS_LONG({{pyval}});
+        {{return_compare('a', 'b', c_op)}}
+    }
+    #endif
+
+    #if CYTHON_USE_PYLONG_INTERNALS
+    if (likely(PyLong_CheckExact({{pyval}}))) {
+        int unequal;
+        unsigned long uintval;
+        Py_ssize_t size = __Pyx_PyLong_DigitCount({{pyval}});
+        const digit* digits = __Pyx_PyLong_Digits({{pyval}});
+        if (intval == 0) {
+            {{return_compare('__Pyx_PyLong_IsZero(%s)' % pyval, '1', c_op)}}
+        } else if (intval < 0) {
+            if (__Pyx_PyLong_IsNonNeg({{pyval}}))
+                {{return_false if op == 'Eq' else return_true}};
+            // both are negative => can use absolute values now.
+            intval = -intval;
+        } else {
+            // > 0  =>  Py_SIZE(pyval) > 0
+            if (__Pyx_PyLong_IsNeg({{pyval}}))
+                {{return_false if op == 'Eq' else return_true}};
+        }
+        // After checking that the sign is the same (and excluding 0), now compare the absolute values.
+        // When inlining, the C compiler should select exactly one line from this unrolled loop.
+        uintval = (unsigned long) intval;
+        {{for _size in range(4, 0, -1)}}
+#if PyLong_SHIFT * {{_size}} < SIZEOF_LONG*8
+        if (uintval >> (PyLong_SHIFT * {{_size}})) {
+            // The C integer value is between (PyLong_BASE ** _size) and MIN(PyLong_BASE ** _size, LONG_MAX).
+            unequal = (size != {{_size+1}}) || (digits[0] != (uintval & (unsigned long) PyLong_MASK))
+                {{for _i in range(1, _size+1)}} | (digits[{{_i}}] != ((uintval >> ({{_i}} * PyLong_SHIFT)) & (unsigned long) PyLong_MASK)){{endfor}};
+        } else
+#endif
+        {{endfor}}
+            unequal = (size != 1) || (((unsigned long) digits[0]) != (uintval & (unsigned long) PyLong_MASK));
+
+        {{return_compare('unequal', '0', c_op)}}
+    }
+    #endif
+
+    if (PyFloat_CheckExact({{pyval}})) {
+        const long {{'a' if order == 'CObj' else 'b'}} = intval;
+#if CYTHON_COMPILING_IN_LIMITED_API
+        double {{ival}} = __pyx_PyFloat_AsDouble({{pyval}});
+#else
+        double {{ival}} = PyFloat_AS_DOUBLE({{pyval}});
+#endif
+        {{return_compare('(double)a', '(double)b', c_op)}}
+    }
+
+    return {{'' if ret_type.is_pyobject else '__Pyx_PyObject_IsTrueAndDecref'}}(
+        PyObject_RichCompare(op1, op2, Py_{{op.upper()}}));
+}
+
+
+/////////////// PyIntBinop.proto ///////////////
+
+{{py: c_ret_type = 'PyObject*' if ret_type.is_pyobject else 'int'}}
+#if !CYTHON_COMPILING_IN_PYPY
+static {{c_ret_type}} __Pyx_PyInt_{{'' if ret_type.is_pyobject else 'Bool'}}{{op}}{{order}}(PyObject *op1, PyObject *op2, long intval, int inplace, int zerodivision_check); /*proto*/
+#else
+#define __Pyx_PyInt_{{'' if ret_type.is_pyobject else 'Bool'}}{{op}}{{order}}(op1, op2, intval, inplace, zerodivision_check) \
+    {{if op in ('Eq', 'Ne')}}{{'' if ret_type.is_pyobject else '__Pyx_PyObject_IsTrueAndDecref'}}(PyObject_RichCompare(op1, op2, Py_{{op.upper()}}))
+    {{else}}(inplace ? PyNumber_InPlace{{op}}(op1, op2) : PyNumber_{{op}}(op1, op2))
+    {{endif}}
+#endif
+
+/////////////// PyIntBinop ///////////////
+
+#if !CYTHON_COMPILING_IN_PYPY
+{{py: from Cython.Utility import pylong_join }}
+{{py: pyval, ival = ('op2', 'b') if order == 'CObj' else ('op1', 'a') }}
+{{py: c_ret_type = 'PyObject*' if ret_type.is_pyobject else 'int'}}
+{{py: return_true = 'Py_RETURN_TRUE' if ret_type.is_pyobject else 'return 1'}}
+{{py: return_false = 'Py_RETURN_FALSE' if ret_type.is_pyobject else 'return 0'}}
+{{py: slot_name = {'TrueDivide': 'true_divide', 'FloorDivide': 'floor_divide'}.get(op, op.lower()) }}
+{{py: cfunc_name = '__Pyx_PyInt_%s%s%s' % ('' if ret_type.is_pyobject else 'Bool', op, order)}}
+{{py:
+c_op = {
+    'Add': '+', 'Subtract': '-', 'Multiply': '*', 'Remainder': '%', 'TrueDivide': '/', 'FloorDivide': '/',
+    'Or': '|', 'Xor': '^', 'And': '&', 'Rshift': '>>', 'Lshift': '<<',
+    'Eq': '==', 'Ne': '!=',
+    }[op]
+}}
+{{py:
+def zerodiv_check(operand, optype='integer', _is_mod=op == 'Remainder', _needs_check=(order == 'CObj' and c_op in '%/')):
+    return (((
+    'if (unlikely(zerodivision_check && ((%s) == 0))) {'
+    ' PyErr_SetString(PyExc_ZeroDivisionError, "%s division%s by zero");'
+    ' return NULL;'
+    '}') % (operand, optype, ' or modulo' if _is_mod else '')
+    ) if _needs_check else '')
+}}
+
+static {{c_ret_type}} {{cfunc_name}}(PyObject *op1, PyObject *op2, long intval, int inplace, int zerodivision_check) {
+    CYTHON_MAYBE_UNUSED_VAR(intval);
+    CYTHON_MAYBE_UNUSED_VAR(inplace);
+    CYTHON_UNUSED_VAR(zerodivision_check);
+
+    {{if op in ('Eq', 'Ne')}}
+    if (op1 == op2) {
+        {{return_true if op == 'Eq' else return_false}};
+    }
+    {{endif}}
+
+    #if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_CheckExact({{pyval}}))) {
+        const long {{'a' if order == 'CObj' else 'b'}} = intval;
+        {{if c_op in '+-%' or op == 'FloorDivide'}}
+        long x;
+        {{endif}}
+        long {{ival}} = PyInt_AS_LONG({{pyval}});
+        {{zerodiv_check('b')}}
+
+        {{if op in ('Eq', 'Ne')}}
+        if (a {{c_op}} b) {
+            {{return_true}};
+        } else {
+            {{return_false}};
+        }
+        {{elif c_op in '+-'}}
+            // adapted from intobject.c in Py2.7:
+            // casts in the line below avoid undefined behaviour on overflow
+            x = (long)((unsigned long)a {{c_op}} (unsigned long)b);
+            if (likely((x^a) >= 0 || (x^{{ '~' if op == 'Subtract' else '' }}b) >= 0))
+                return PyInt_FromLong(x);
+            return PyLong_Type.tp_as_number->nb_{{slot_name}}(op1, op2);
+        {{elif c_op == '%'}}
+            // see CMath.c :: ModInt utility code
+            x = a % b;
+            x += ((x != 0) & ((x ^ b) < 0)) * b;
+            return PyInt_FromLong(x);
+        {{elif op == 'TrueDivide'}}
+            if (8 * sizeof(long) <= 53 || likely(labs({{ival}}) <= ((PY_LONG_LONG)1 << 53))) {
+                return PyFloat_FromDouble((double)a / (double)b);
+            }
+            // let Python do the rounding
+            return PyInt_Type.tp_as_number->nb_{{slot_name}}(op1, op2);
+        {{elif op == 'FloorDivide'}}
+            // INT_MIN / -1  is the only case that overflows
+            if (unlikely(b == -1 && ((unsigned long)a) == 0-(unsigned long)a))
+                return PyInt_Type.tp_as_number->nb_{{slot_name}}(op1, op2);
+            else {
+                long q, r;
+                // see CMath.c :: DivInt utility code
+                q = a / b;
+                r = a - q*b;
+                q -= ((r != 0) & ((r ^ b) < 0));
+                x = q;
+            }
+            return PyInt_FromLong(x);
+        {{elif op == 'Lshift'}}
+            if (likely(b < (int)(sizeof(long)*8) && a == (a << b) >> b) || !a) {
+                return PyInt_FromLong(a {{c_op}} b);
+            }
+        {{elif c_op == '*'}}
+#ifdef HAVE_LONG_LONG
+            if (sizeof(PY_LONG_LONG) > sizeof(long)) {
+                PY_LONG_LONG result = (PY_LONG_LONG)a {{c_op}} (PY_LONG_LONG)b;
+                return (result >= LONG_MIN && result <= LONG_MAX) ?
+                    PyInt_FromLong((long)result) : PyLong_FromLongLong(result);
+            }
+#endif
+#if CYTHON_USE_TYPE_SLOTS
+            return PyInt_Type.tp_as_number->nb_{{slot_name}}(op1, op2);
+#else
+            return PyNumber_{{op}}(op1, op2);
+#endif
+        {{else}}
+            // other operations are safe, no overflow
+            return PyInt_FromLong(a {{c_op}} b);
+        {{endif}}
+    }
+    #endif
+
+    #if CYTHON_USE_PYLONG_INTERNALS
+    if (likely(PyLong_CheckExact({{pyval}}))) {
+        const long {{'a' if order == 'CObj' else 'b'}} = intval;
+        long {{ival}}{{if op not in ('Eq', 'Ne')}}, x{{endif}};
+        {{if op not in ('Eq', 'Ne', 'TrueDivide')}}
+#ifdef HAVE_LONG_LONG
+        const PY_LONG_LONG ll{{'a' if order == 'CObj' else 'b'}} = intval;
+        PY_LONG_LONG ll{{ival}}, llx;
+#endif
+        {{endif}}
+        // special cases for 0: + - * % / // | ^ & >> <<
+        if (unlikely(__Pyx_PyLong_IsZero({{pyval}}))) {
+            {{if order == 'CObj' and c_op in '%/'}}
+            // division by zero!
+            {{zerodiv_check('0')}}
+            {{elif order == 'CObj' and c_op in '+-|^>><<'}}
+            // x == x+0 == x-0 == x|0 == x^0 == x>>0 == x<<0
+            return __Pyx_NewRef(op1);
+            {{elif order == 'CObj' and c_op in '*&'}}
+            // 0 == x*0 == x&0
+            return __Pyx_NewRef(op2);
+            {{elif order == 'ObjC' and c_op in '+|^'}}
+            // x == 0+x == 0|x == 0^x
+            return __Pyx_NewRef(op2);
+            {{elif order == 'ObjC' and c_op == '-'}}
+            // -x == 0-x
+            return PyLong_FromLong(-intval);
+            {{elif order == 'ObjC' and (c_op in '*%&>><<' or op == 'FloorDivide')}}
+            // 0 == 0*x == 0%x == 0&x == 0>>x == 0<<x == 0//x
+            return __Pyx_NewRef(op1);
+            {{endif}}
+        }
+        {{if c_op == '&'}}
+        // special case for &-ing arbitrarily large numbers with known single digit operands
+        if ((intval & PyLong_MASK) == intval) {
+            // Calling PyLong_CompactValue() requires the PyLong value to be compact, we only need the last digit.
+            long last_digit = (long) __Pyx_PyLong_Digits({{pyval}})[0];
+            long result = intval & (likely(__Pyx_PyLong_IsPos({{pyval}})) ? last_digit : (PyLong_MASK - last_digit + 1));
+            return PyLong_FromLong(result);
+        }
+        {{endif}}
+        // handle most common case first to avoid indirect branch and optimise branch prediction
+        if (likely(__Pyx_PyLong_IsCompact({{pyval}}))) {
+            {{ival}} = __Pyx_PyLong_CompactValue({{pyval}});
+        } else {
+            const digit* digits = __Pyx_PyLong_Digits({{pyval}});
+            const Py_ssize_t size = __Pyx_PyLong_SignedDigitCount({{pyval}});
+            switch (size) {
+                {{for _size in range(2, 5)}}
+                {{for _case in (-_size, _size)}}
+                case {{_case}}:
+                    if (8 * sizeof(long) - 1 > {{_size}} * PyLong_SHIFT{{if c_op == '*'}}+30{{endif}}{{if op == 'TrueDivide'}} && {{_size-1}} * PyLong_SHIFT < 53{{endif}}) {
+                        {{ival}} = {{'-' if _case < 0 else ''}}(long) {{pylong_join(_size, 'digits')}};
+                        break;
+                    {{if op not in ('Eq', 'Ne', 'TrueDivide')}}
+                    #ifdef HAVE_LONG_LONG
+                    } else if (8 * sizeof(PY_LONG_LONG) - 1 > {{_size}} * PyLong_SHIFT{{if c_op == '*'}}+30{{endif}}) {
+                        ll{{ival}} = {{'-' if _case < 0 else ''}}(PY_LONG_LONG) {{pylong_join(_size, 'digits', 'unsigned PY_LONG_LONG')}};
+                        goto long_long;
+                    #endif
+                    {{endif}}
+                    }
+                    // if size doesn't fit into a long or PY_LONG_LONG anymore, fall through to default
+                    CYTHON_FALLTHROUGH;
+                {{endfor}}
+                {{endfor}}
+
+                {{if op in ('Eq', 'Ne')}}
+                #if PyLong_SHIFT < 30 && PyLong_SHIFT != 15
+                // unusual setup - your fault
+                default: return {{'' if ret_type.is_pyobject else '__Pyx_PyObject_IsTrueAndDecref'}}(
+                    PyLong_Type.tp_richcompare({{'op1, op2' if order == 'ObjC' else 'op2, op1'}}, Py_{{op.upper()}}));
+                #else
+                // too large for the long values we allow => definitely not equal
+                default: {{return_false if op == 'Eq' else return_true}};
+                #endif
+                {{else}}
+                default: return PyLong_Type.tp_as_number->nb_{{slot_name}}(op1, op2);
+                {{endif}}
+            }
+        }
+        {{if op in ('Eq', 'Ne')}}
+            if (a {{c_op}} b) {
+                {{return_true}};
+            } else {
+                {{return_false}};
+            }
+        {{else}}
+            {{if c_op == '*'}}
+                CYTHON_UNUSED_VAR(a);
+                CYTHON_UNUSED_VAR(b);
+                #ifdef HAVE_LONG_LONG
+                ll{{ival}} = {{ival}};
+                goto long_long;
+                #else
+                return PyLong_Type.tp_as_number->nb_{{slot_name}}(op1, op2);
+                #endif
+            {{elif c_op == '%'}}
+                // see CMath.c :: ModInt utility code
+                x = a % b;
+                x += ((x != 0) & ((x ^ b) < 0)) * b;
+            {{elif op == 'TrueDivide'}}
+                if ((8 * sizeof(long) <= 53 || likely(labs({{ival}}) <= ((PY_LONG_LONG)1 << 53)))
+                        || __Pyx_PyLong_DigitCount({{pyval}}) <= 52 / PyLong_SHIFT) {
+                    return PyFloat_FromDouble((double)a / (double)b);
+                }
+                return PyLong_Type.tp_as_number->nb_{{slot_name}}(op1, op2);
+            {{elif op == 'FloorDivide'}}
+                {
+                    long q, r;
+                    // see CMath.c :: DivInt utility code
+                    q = a / b;
+                    r = a - q*b;
+                    q -= ((r != 0) & ((r ^ b) < 0));
+                    x = q;
+                }
+            {{else}}
+                x = a {{c_op}} b;
+                {{if op == 'Lshift'}}
+#ifdef HAVE_LONG_LONG
+                if (unlikely(!(b < (int)(sizeof(long)*8) && a == x >> b)) && a) {
+                    ll{{ival}} = {{ival}};
+                    goto long_long;
+                }
+#else
+                if (likely(b < (int)(sizeof(long)*8) && a == x >> b) || !a) /* execute return statement below */
+#endif
+                {{endif}}
+            {{endif}}
+            return PyLong_FromLong(x);
+
+        {{if op != 'TrueDivide'}}
+#ifdef HAVE_LONG_LONG
+        long_long:
+            {{if c_op == '%'}}
+                // see CMath.c :: ModInt utility code
+                llx = lla % llb;
+                llx += ((llx != 0) & ((llx ^ llb) < 0)) * llb;
+            {{elif op == 'FloorDivide'}}
+                {
+                    PY_LONG_LONG q, r;
+                    // see CMath.c :: DivInt utility code
+                    q = lla / llb;
+                    r = lla - q*llb;
+                    q -= ((r != 0) & ((r ^ llb) < 0));
+                    llx = q;
+                }
+            {{else}}
+                llx = lla {{c_op}} llb;
+                {{if op == 'Lshift'}}
+                if (likely(lla == llx >> llb)) /* then execute 'return' below */
+                {{endif}}
+            {{endif}}
+            return PyLong_FromLongLong(llx);
+#endif
+        {{endif}}{{# if op != 'TrueDivide' #}}
+        {{endif}}{{# if op in ('Eq', 'Ne') #}}
+    }
+    #endif
+
+    {{if c_op in '+-*' or op in ('TrueDivide', 'Eq', 'Ne')}}
+    if (PyFloat_CheckExact({{pyval}})) {
+        const long {{'a' if order == 'CObj' else 'b'}} = intval;
+#if CYTHON_COMPILING_IN_LIMITED_API
+        double {{ival}} = __pyx_PyFloat_AsDouble({{pyval}});
+#else
+        double {{ival}} = PyFloat_AS_DOUBLE({{pyval}});
+#endif
+        {{if op in ('Eq', 'Ne')}}
+            if ((double)a {{c_op}} (double)b) {
+                {{return_true}};
+            } else {
+                {{return_false}};
+            }
+        {{else}}
+            double result;
+            {{zerodiv_check('b', 'float')}}
+            // copied from floatobject.c in Py3.5:
+//            PyFPE_START_PROTECT("{{op.lower() if not op.endswith('Divide') else 'divide'}}", return NULL)
+            result = ((double)a) {{c_op}} (double)b;
+//            PyFPE_END_PROTECT(result)
+            return PyFloat_FromDouble(result);
+        {{endif}}
+    }
+    {{endif}}
+
+    {{if op in ('Eq', 'Ne')}}
+    return {{'' if ret_type.is_pyobject else '__Pyx_PyObject_IsTrueAndDecref'}}(
+        PyObject_RichCompare(op1, op2, Py_{{op.upper()}}));
+    {{else}}
+    return (inplace ? PyNumber_InPlace{{op}} : PyNumber_{{op}})(op1, op2);
+    {{endif}}
+}
+#endif
+
+/////////////// PyFloatBinop.proto ///////////////
+
+{{py: c_ret_type = 'PyObject*' if ret_type.is_pyobject else 'int'}}
+#if !CYTHON_COMPILING_IN_PYPY
+static {{c_ret_type}} __Pyx_PyFloat_{{'' if ret_type.is_pyobject else 'Bool'}}{{op}}{{order}}(PyObject *op1, PyObject *op2, double floatval, int inplace, int zerodivision_check); /*proto*/
+#else
+#define __Pyx_PyFloat_{{'' if ret_type.is_pyobject else 'Bool'}}{{op}}{{order}}(op1, op2, floatval, inplace, zerodivision_check) \
+    {{if op in ('Eq', 'Ne')}}{{'' if ret_type.is_pyobject else '__Pyx_PyObject_IsTrueAndDecref'}}(PyObject_RichCompare(op1, op2, Py_{{op.upper()}}))
+    {{elif op == 'Divide'}}((inplace ? __Pyx_PyNumber_InPlaceDivide(op1, op2) : __Pyx_PyNumber_Divide(op1, op2)))
+    {{else}}(inplace ? PyNumber_InPlace{{op}}(op1, op2) : PyNumber_{{op}}(op1, op2))
+    {{endif}}
+#endif
+
+/////////////// PyFloatBinop ///////////////
+
+#if !CYTHON_COMPILING_IN_PYPY
+{{py: from Cython.Utility import pylong_join }}
+{{py: c_ret_type = 'PyObject*' if ret_type.is_pyobject else 'int'}}
+{{py: return_true = 'Py_RETURN_TRUE' if ret_type.is_pyobject else 'return 1'}}
+{{py: return_false = 'Py_RETURN_FALSE' if ret_type.is_pyobject else 'return 0'}}
+{{py: pyval, fval = ('op2', 'b') if order == 'CObj' else ('op1', 'a') }}
+{{py: cfunc_name = '__Pyx_PyFloat_%s%s%s' % ('' if ret_type.is_pyobject else 'Bool', op, order) }}
+{{py:
+c_op = {
+    'Add': '+', 'Subtract': '-', 'TrueDivide': '/', 'Divide': '/', 'Remainder': '%',
+    'Eq': '==', 'Ne': '!=',
+    }[op]
+}}
+{{py:
+def zerodiv_check(operand, _is_mod=op == 'Remainder', _needs_check=(order == 'CObj' and c_op in '%/')):
+    return (((
+        'if (unlikely(zerodivision_check && ((%s) == 0.0))) {'
+        ' PyErr_SetString(PyExc_ZeroDivisionError, "float division%s by zero");'
+        ' return NULL;'
+        '}') % (operand, ' or modulo' if _is_mod else '')
+    ) if _needs_check else '')
+}}
+
+static {{c_ret_type}} {{cfunc_name}}(PyObject *op1, PyObject *op2, double floatval, int inplace, int zerodivision_check) {
+    const double {{'a' if order == 'CObj' else 'b'}} = floatval;
+    double {{fval}}{{if op not in ('Eq', 'Ne')}}, result{{endif}};
+    CYTHON_UNUSED_VAR(inplace);
+    CYTHON_UNUSED_VAR(zerodivision_check);
+
+    {{if op in ('Eq', 'Ne')}}
+    if (op1 == op2) {
+        {{return_true if op == 'Eq' else return_false}};
+    }
+    {{endif}}
+
+    if (likely(PyFloat_CheckExact({{pyval}}))) {
+#if CYTHON_COMPILING_IN_LIMITED_API
+        {{fval}} = __pyx_PyFloat_AsDouble({{pyval}});
+#else
+        {{fval}} = PyFloat_AS_DOUBLE({{pyval}});
+#endif
+        {{zerodiv_check(fval)}}
+    } else
+
+    #if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_CheckExact({{pyval}}))) {
+        {{fval}} = (double) PyInt_AS_LONG({{pyval}});
+        {{zerodiv_check(fval)}}
+    } else
+    #endif
+
+    if (likely(PyLong_CheckExact({{pyval}}))) {
+        #if CYTHON_USE_PYLONG_INTERNALS
+        if (__Pyx_PyLong_IsZero({{pyval}})) {
+            {{fval}} = 0.0;
+            {{zerodiv_check(fval)}}
+        } else if (__Pyx_PyLong_IsCompact({{pyval}})) {
+            {{fval}} = (double) __Pyx_PyLong_CompactValue({{pyval}});
+        } else {
+            const digit* digits = __Pyx_PyLong_Digits({{pyval}});
+            const Py_ssize_t size = __Pyx_PyLong_SignedDigitCount({{pyval}});
+            switch (size) {
+                {{for _size in (2, 3, 4)}}
+                case -{{_size}}:
+                case {{_size}}:
+                    if (8 * sizeof(unsigned long) > {{_size}} * PyLong_SHIFT && ((8 * sizeof(unsigned long) < 53) || ({{_size-1}} * PyLong_SHIFT < 53))) {
+                        {{fval}} = (double) {{pylong_join(_size, 'digits')}};
+                        // let CPython do its own float rounding from 2**53 on (max. consecutive integer in double float)
+                        if ((8 * sizeof(unsigned long) < 53) || ({{_size}} * PyLong_SHIFT < 53) || ({{fval}} < (double) ((PY_LONG_LONG)1 << 53))) {
+                            if (size == {{-_size}})
+                                {{fval}} = -{{fval}};
+                            break;
+                        }
+                    }
+                    // Fall through if size doesn't fit safely into a double anymore.
+                    // It may not be obvious that this is a safe fall-through given the "fval < 2**53"
+                    // check above.  However, the number of digits that CPython uses for a given PyLong
+                    // value is minimal, and together with the "(size-1) * SHIFT < 53" check above,
+                    // this should make it safe.
+                    CYTHON_FALLTHROUGH;
+                {{endfor}}
+                default:
+        #endif
+        {{if op in ('Eq', 'Ne')}}
+                    return {{'' if ret_type.is_pyobject else '__Pyx_PyObject_IsTrueAndDecref'}}(
+                        PyFloat_Type.tp_richcompare({{'op1, op2' if order == 'CObj' else 'op2, op1'}}, Py_{{op.upper()}}));
+        {{else}}
+                    {{fval}} = PyLong_AsDouble({{pyval}});
+                    if (unlikely({{fval}} == -1.0 && PyErr_Occurred())) return NULL;
+                    {{if zerodiv_check(fval)}}
+                    #if !CYTHON_USE_PYLONG_INTERNALS
+                    {{zerodiv_check(fval)}}
+                    #endif
+                    {{endif}}
+        {{endif}}
+        #if CYTHON_USE_PYLONG_INTERNALS
+            }
+        }
+        #endif
+    } else {
+        {{if op in ('Eq', 'Ne')}}
+        return {{'' if ret_type.is_pyobject else '__Pyx_PyObject_IsTrueAndDecref'}}(
+            PyObject_RichCompare(op1, op2, Py_{{op.upper()}}));
+        {{elif op == 'Divide'}}
+        return (inplace ? __Pyx_PyNumber_InPlaceDivide(op1, op2) : __Pyx_PyNumber_Divide(op1, op2));
+        {{else}}
+        return (inplace ? PyNumber_InPlace{{op}} : PyNumber_{{op}})(op1, op2);
+        {{endif}}
+    }
+
+    {{if op in ('Eq', 'Ne')}}
+        if (a {{c_op}} b) {
+            {{return_true}};
+        } else {
+            {{return_false}};
+        }
+    {{else}}
+        // copied from floatobject.c in Py3.5:
+//        PyFPE_START_PROTECT("{{op.lower() if not op.endswith('Divide') else 'divide'}}", return NULL)
+        {{if c_op == '%'}}
+        result = fmod(a, b);
+        if (result)
+            result += ((result < 0) ^ (b < 0)) * b;
+        else
+            result = copysign(0.0, b);
+        {{else}}
+        result = a {{c_op}} b;
+        {{endif}}
+//        PyFPE_END_PROTECT(result)
+        return PyFloat_FromDouble(result);
+    {{endif}}
+}
+#endif
diff --git a/contrib/tools/cython_py2/Cython/Utility/Overflow.c b/contrib/tools/cython_py2/Cython/Utility/Overflow.c
new file mode 100644
index 00000000000..0ae375d78c3
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Overflow.c
@@ -0,0 +1,404 @@
+/*
+These functions provide integer arithmetic with integer checking.  They do not
+actually raise an exception when an overflow is detected, but rather set a bit
+in the overflow parameter.  (This parameter may be reused across several
+arithmetic operations, so should be or-ed rather than assigned to.)
+
+The implementation is divided into two parts, the signed and unsigned basecases,
+which is where the magic happens, and a generic template matching a specific
+type to an implementation based on its (c-compile-time) size and signedness.
+
+When possible, branching is avoided, and preference is given to speed over
+accuracy (a low rate of falsely "detected" overflows are acceptable,
+undetected overflows are not).
+
+
+TODO: Hook up checking.
+TODO: Conditionally support 128-bit with intmax_t?
+*/
+
+/////////////// Common.proto ///////////////
+
+static int __Pyx_check_twos_complement(void) {
+    if ((-1) != (~0)) {
+        PyErr_SetString(PyExc_RuntimeError, "Two's complement required for overflow checks.");
+        return 1;
+    } else if ((sizeof(short) == sizeof(int))) {
+        PyErr_SetString(PyExc_RuntimeError, "sizeof(short) < sizeof(int) required for overflow checks.");
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+#define __PYX_SIGN_BIT(type)    ((((unsigned type) 1) << (sizeof(type) * 8 - 1)))
+#define __PYX_HALF_MAX(type)    ((((type) 1) << (sizeof(type) * 8 - 2)))
+#define __PYX_MIN(type)         ((__PYX_IS_UNSIGNED(type) ? (type) 0 : 0 - __PYX_HALF_MAX(type) - __PYX_HALF_MAX(type)))
+#define __PYX_MAX(type)         ((~__PYX_MIN(type)))
+
+#define __Pyx_add_no_overflow(a, b, overflow) ((a) + (b))
+#define __Pyx_add_const_no_overflow(a, b, overflow) ((a) + (b))
+#define __Pyx_sub_no_overflow(a, b, overflow) ((a) - (b))
+#define __Pyx_sub_const_no_overflow(a, b, overflow) ((a) - (b))
+#define __Pyx_mul_no_overflow(a, b, overflow) ((a) * (b))
+#define __Pyx_mul_const_no_overflow(a, b, overflow) ((a) * (b))
+#define __Pyx_div_no_overflow(a, b, overflow) ((a) / (b))
+#define __Pyx_div_const_no_overflow(a, b, overflow) ((a) / (b))
+
+#if defined(__has_builtin)
+#  if __has_builtin(__builtin_add_overflow) && !defined(__ibmxl__)
+#    define __PYX_HAVE_BUILTIN_OVERFLOW
+#  endif
+#elif defined(__GNUC__) && (__GNUC__ >= 5) && (!defined(__INTEL_COMPILER) || (__INTEL_COMPILER >= 1800))
+#  define __PYX_HAVE_BUILTIN_OVERFLOW
+#endif
+
+#if defined(__GNUC__)
+#  define __Pyx_is_constant(x) (__builtin_constant_p(x))
+#elif defined(__has_builtin)
+#  if __has_builtin(__builtin_constant_p)
+#    define __Pyx_is_constant(x) (__builtin_constant_p(x))
+#  endif
+#else
+#  define __Pyx_is_constant(x) (0)
+#endif
+
+/////////////// Common.init ///////////////
+
+if (likely(__Pyx_check_twos_complement() == 0)); else
+// error propagation code is appended automatically
+
+/////////////// BaseCaseUnsigned.proto ///////////////
+
+{{if UINT == "long long"}}#ifdef HAVE_LONG_LONG{{endif}}
+
+static CYTHON_INLINE {{UINT}} __Pyx_add_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow);
+static CYTHON_INLINE {{UINT}} __Pyx_sub_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow);
+static CYTHON_INLINE {{UINT}} __Pyx_mul_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow);
+static CYTHON_INLINE {{UINT}} __Pyx_div_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow);
+
+// Use these when b is known at compile time.
+#define __Pyx_add_const_{{NAME}}_checking_overflow __Pyx_add_{{NAME}}_checking_overflow
+#define __Pyx_sub_const_{{NAME}}_checking_overflow __Pyx_sub_{{NAME}}_checking_overflow
+#if defined(__PYX_HAVE_BUILTIN_OVERFLOW)
+#define __Pyx_mul_const_{{NAME}}_checking_overflow __Pyx_mul_{{NAME}}_checking_overflow
+#else
+static CYTHON_INLINE {{UINT}} __Pyx_mul_const_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} constant, int *overflow);
+#endif
+#define __Pyx_div_const_{{NAME}}_checking_overflow __Pyx_div_{{NAME}}_checking_overflow
+
+{{if UINT == "long long"}}#endif{{endif}}
+
+/////////////// BaseCaseUnsigned ///////////////
+
+{{if UINT == "long long"}}#ifdef HAVE_LONG_LONG{{endif}}
+
+#if defined(__PYX_HAVE_BUILTIN_OVERFLOW)
+
+static CYTHON_INLINE {{UINT}} __Pyx_add_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow) {
+    {{UINT}} result;
+    *overflow |= __builtin_add_overflow(a, b, &result);
+    return result;
+}
+
+static CYTHON_INLINE {{UINT}} __Pyx_sub_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow) {
+    {{UINT}} result;
+    *overflow |= __builtin_sub_overflow(a, b, &result);
+    return result;
+}
+
+static CYTHON_INLINE {{UINT}} __Pyx_mul_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow) {
+    {{UINT}} result;
+    *overflow |= __builtin_mul_overflow(a, b, &result);
+    return result;
+}
+
+#else
+
+static CYTHON_INLINE {{UINT}} __Pyx_add_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow) {
+    {{UINT}} r = a + b;
+    *overflow |= r < a;
+    return r;
+}
+
+static CYTHON_INLINE {{UINT}} __Pyx_sub_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow) {
+    {{UINT}} r = a - b;
+    *overflow |= r > a;
+    return r;
+}
+
+static CYTHON_INLINE {{UINT}} __Pyx_mul_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow) {
+    // if we have a constant, use the constant version
+    if (__Pyx_is_constant(b)) {
+        return __Pyx_mul_const_{{NAME}}_checking_overflow(a, b, overflow);
+    } else if (__Pyx_is_constant(a)) {
+        return __Pyx_mul_const_{{NAME}}_checking_overflow(b, a, overflow);
+    } else if ((sizeof({{UINT}}) < sizeof(unsigned long))) {
+        unsigned long big_r = ((unsigned long) a) * ((unsigned long) b);
+        {{UINT}} r = ({{UINT}}) big_r;
+        *overflow |= big_r != r;
+        return r;
+#ifdef HAVE_LONG_LONG
+    } else if ((sizeof({{UINT}}) < sizeof(unsigned PY_LONG_LONG))) {
+        unsigned PY_LONG_LONG big_r = ((unsigned PY_LONG_LONG) a) * ((unsigned PY_LONG_LONG) b);
+        {{UINT}} r = ({{UINT}}) big_r;
+        *overflow |= big_r != r;
+        return r;
+#endif
+    } else {
+        return __Pyx_mul_const_{{NAME}}_checking_overflow(a, b, overflow);
+    }
+}
+
+static CYTHON_INLINE {{UINT}} __Pyx_mul_const_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow) {
+    // note that deliberately the overflow check is written such that it divides by b; this
+    // function is used when b is a constant thus the compiler should be able to eliminate the
+    // (very slow on most CPUs!) division operation
+    {{UINT}} prod;
+    if (__Pyx_is_constant(a) && !__Pyx_is_constant(b)) {
+        // if a is a compile-time constant and b isn't, swap them
+        {{UINT}} temp = b;
+        b = a;
+        a = temp;
+    }
+    prod = a * b;
+    if (b != 0)
+        *overflow |= a > (__PYX_MAX({{UINT}}) / b);
+    return prod;
+}
+#endif // __PYX_HAVE_BUILTIN_OVERFLOW
+
+
+static CYTHON_INLINE {{UINT}} __Pyx_div_{{NAME}}_checking_overflow({{UINT}} a, {{UINT}} b, int *overflow) {
+    if (b == 0) {
+        *overflow |= 1;
+        return 0;
+    }
+    return a / b;
+}
+
+{{if UINT == "long long"}}#endif{{endif}}
+
+
+/////////////// BaseCaseSigned.proto ///////////////
+
+{{if INT == "long long"}}#ifdef HAVE_LONG_LONG{{endif}}
+
+static CYTHON_INLINE {{INT}} __Pyx_add_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow);
+static CYTHON_INLINE {{INT}} __Pyx_sub_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow);
+static CYTHON_INLINE {{INT}} __Pyx_mul_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow);
+static CYTHON_INLINE {{INT}} __Pyx_div_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow);
+
+
+// Use when b is known at compile time.
+#define __Pyx_add_const_{{NAME}}_checking_overflow __Pyx_add_{{NAME}}_checking_overflow
+#define __Pyx_sub_const_{{NAME}}_checking_overflow __Pyx_sub_{{NAME}}_checking_overflow
+#if defined(__PYX_HAVE_BUILTIN_OVERFLOW)
+#define __Pyx_mul_const_{{NAME}}_checking_overflow __Pyx_mul_{{NAME}}_checking_overflow
+#else
+static CYTHON_INLINE {{INT}} __Pyx_mul_const_{{NAME}}_checking_overflow({{INT}} a, {{INT}} constant, int *overflow);
+#endif
+#define __Pyx_div_const_{{NAME}}_checking_overflow __Pyx_div_{{NAME}}_checking_overflow
+
+{{if INT == "long long"}}#endif{{endif}}
+
+/////////////// BaseCaseSigned ///////////////
+
+{{if INT == "long long"}}#ifdef HAVE_LONG_LONG{{endif}}
+
+#if defined(__PYX_HAVE_BUILTIN_OVERFLOW)
+
+static CYTHON_INLINE {{INT}} __Pyx_add_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow) {
+    {{INT}} result;
+    *overflow |= __builtin_add_overflow(a, b, &result);
+    return result;
+}
+
+static CYTHON_INLINE {{INT}} __Pyx_sub_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow) {
+    {{INT}} result;
+    *overflow |= __builtin_sub_overflow(a, b, &result);
+    return result;
+}
+
+static CYTHON_INLINE {{INT}} __Pyx_mul_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow) {
+    {{INT}} result;
+    *overflow |= __builtin_mul_overflow(a, b, &result);
+    return result;
+}
+
+#else
+
+static CYTHON_INLINE {{INT}} __Pyx_add_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow) {
+    if ((sizeof({{INT}}) < sizeof(long))) {
+        long big_r = ((long) a) + ((long) b);
+        {{INT}} r = ({{INT}}) big_r;
+        *overflow |= big_r != r;
+        return r;
+#ifdef HAVE_LONG_LONG
+    } else if ((sizeof({{INT}}) < sizeof(PY_LONG_LONG))) {
+        PY_LONG_LONG big_r = ((PY_LONG_LONG) a) + ((PY_LONG_LONG) b);
+        {{INT}} r = ({{INT}}) big_r;
+        *overflow |= big_r != r;
+        return r;
+#endif
+    } else {
+        // Signed overflow undefined, but unsigned overflow is well defined. Casting is
+        // implementation-defined, but we assume two's complement (see __Pyx_check_twos_complement
+        // above), and arithmetic in two's-complement is the same as unsigned arithmetic.
+        unsigned {{INT}} r = (unsigned {{INT}}) a + (unsigned {{INT}}) b;
+        // Overflow happened if the operands have the same sign, but the result
+        // has opposite sign.
+        *overflow |= (((unsigned {{INT}})a ^ r) & ((unsigned {{INT}})b ^ r)) >> (8 * sizeof({{INT}}) - 1);
+        return ({{INT}}) r;
+    }
+}
+
+static CYTHON_INLINE {{INT}} __Pyx_sub_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow) {
+    // Compilers don't handle widening as well in the subtraction case, so don't bother
+    unsigned {{INT}} r = (unsigned {{INT}}) a - (unsigned {{INT}}) b;
+    // Overflow happened if the operands differing signs, and the result
+    // has opposite sign to a.
+    *overflow |= (((unsigned {{INT}})a ^ (unsigned {{INT}})b) & ((unsigned {{INT}})a ^ r)) >> (8 * sizeof({{INT}}) - 1);
+    return ({{INT}}) r;
+}
+
+static CYTHON_INLINE {{INT}} __Pyx_mul_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow) {
+    // if we have a constant, use the constant version
+    if (__Pyx_is_constant(b)) {
+        return __Pyx_mul_const_{{NAME}}_checking_overflow(a, b, overflow);
+    } else if (__Pyx_is_constant(a)) {
+        return __Pyx_mul_const_{{NAME}}_checking_overflow(b, a, overflow);
+    } else if ((sizeof({{INT}}) < sizeof(long))) {
+        long big_r = ((long) a) * ((long) b);
+        {{INT}} r = ({{INT}}) big_r;
+        *overflow |= big_r != r;
+        return ({{INT}}) r;
+#ifdef HAVE_LONG_LONG
+    } else if ((sizeof({{INT}}) < sizeof(PY_LONG_LONG))) {
+        PY_LONG_LONG big_r = ((PY_LONG_LONG) a) * ((PY_LONG_LONG) b);
+        {{INT}} r = ({{INT}}) big_r;
+        *overflow |= big_r != r;
+        return ({{INT}}) r;
+#endif
+    } else {
+        return __Pyx_mul_const_{{NAME}}_checking_overflow(a, b, overflow);
+    }
+}
+
+static CYTHON_INLINE {{INT}} __Pyx_mul_const_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow) {
+    // note that deliberately all these comparisons are written such that they divide by b; this
+    // function is used when b is a constant thus the compiler should be able to eliminate the
+    // (very slow on most CPUs!) division operations
+    if (__Pyx_is_constant(a) && !__Pyx_is_constant(b)) {
+        // if a is a compile-time constant and b isn't, swap them
+        {{INT}} temp = b;
+        b = a;
+        a = temp;
+    }
+    if (b > 1) {
+        *overflow |= a > __PYX_MAX({{INT}}) / b;
+        *overflow |= a < __PYX_MIN({{INT}}) / b;
+    } else if (b == -1) {
+        *overflow |= a == __PYX_MIN({{INT}});
+    } else if (b < -1) {
+        *overflow |= a > __PYX_MIN({{INT}}) / b;
+        *overflow |= a < __PYX_MAX({{INT}}) / b;
+    }
+    return ({{INT}}) (((unsigned {{INT}})a) * ((unsigned {{INT}}) b));
+}
+#endif  // defined(__PYX_HAVE_BUILTIN_OVERFLOW)
+
+static CYTHON_INLINE {{INT}} __Pyx_div_{{NAME}}_checking_overflow({{INT}} a, {{INT}} b, int *overflow) {
+    if (b == 0) {
+        *overflow |= 1;
+        return 0;
+    }
+    *overflow |= a == __PYX_MIN({{INT}}) && b == -1;
+    return ({{INT}}) ((unsigned {{INT}}) a / (unsigned {{INT}}) b);
+}
+
+{{if INT == "long long"}}#endif{{endif}}
+
+
+/////////////// SizeCheck.init ///////////////
+
+if (likely(__Pyx_check_sane_{{NAME}}() == 0)); else
+// error propagation code is appended automatically
+
+/////////////// SizeCheck.proto ///////////////
+
+static int __Pyx_check_sane_{{NAME}}(void) {
+    if (((sizeof({{TYPE}}) <= sizeof(int)) ||
+#ifdef HAVE_LONG_LONG
+            (sizeof({{TYPE}}) == sizeof(PY_LONG_LONG)) ||
+#endif
+            (sizeof({{TYPE}}) == sizeof(long)))) {
+        return 0;
+    } else {
+        PyErr_Format(PyExc_RuntimeError, \
+            "Bad size for int type %.{{max(60, len(TYPE))}}s: %d", "{{TYPE}}", (int) sizeof({{TYPE}}));
+        return 1;
+    }
+}
+
+
+/////////////// Binop.proto ///////////////
+
+static CYTHON_INLINE {{TYPE}} __Pyx_{{BINOP}}_{{NAME}}_checking_overflow({{TYPE}} a, {{TYPE}} b, int *overflow);
+
+/////////////// Binop ///////////////
+
+static CYTHON_INLINE {{TYPE}} __Pyx_{{BINOP}}_{{NAME}}_checking_overflow({{TYPE}} a, {{TYPE}} b, int *overflow) {
+    if ((sizeof({{TYPE}}) < sizeof(int))) {
+        return __Pyx_{{BINOP}}_no_overflow(a, b, overflow);
+    } else if (__PYX_IS_UNSIGNED({{TYPE}})) {
+        if ((sizeof({{TYPE}}) == sizeof(unsigned int))) {
+            return ({{TYPE}}) __Pyx_{{BINOP}}_unsigned_int_checking_overflow(a, b, overflow);
+        } else if ((sizeof({{TYPE}}) == sizeof(unsigned long))) {
+            return ({{TYPE}}) __Pyx_{{BINOP}}_unsigned_long_checking_overflow(a, b, overflow);
+#ifdef HAVE_LONG_LONG
+        } else if ((sizeof({{TYPE}}) == sizeof(unsigned PY_LONG_LONG))) {
+            return ({{TYPE}}) __Pyx_{{BINOP}}_unsigned_long_long_checking_overflow(a, b, overflow);
+#endif
+        } else {
+            abort(); return 0; /* handled elsewhere */
+        }
+    } else {
+        if ((sizeof({{TYPE}}) == sizeof(int))) {
+            return ({{TYPE}}) __Pyx_{{BINOP}}_int_checking_overflow(a, b, overflow);
+        } else if ((sizeof({{TYPE}}) == sizeof(long))) {
+            return ({{TYPE}}) __Pyx_{{BINOP}}_long_checking_overflow(a, b, overflow);
+#ifdef HAVE_LONG_LONG
+        } else if ((sizeof({{TYPE}}) == sizeof(PY_LONG_LONG))) {
+            return ({{TYPE}}) __Pyx_{{BINOP}}_long_long_checking_overflow(a, b, overflow);
+#endif
+        } else {
+            abort(); return 0; /* handled elsewhere */
+        }
+    }
+}
+
+/////////////// LeftShift.proto ///////////////
+
+static CYTHON_INLINE {{TYPE}} __Pyx_lshift_{{NAME}}_checking_overflow({{TYPE}} a, {{TYPE}} b, int *overflow) {
+    int overflow_check =
+#if {{SIGNED}}
+        (a < 0) || (b < 0) ||
+#endif
+        // the following must be a _logical_ OR as the RHS is undefined if the LHS is true
+        (b >= ({{TYPE}}) (8 * sizeof({{TYPE}}))) || (a > (__PYX_MAX({{TYPE}}) >> b));
+    if (overflow_check) {
+        *overflow |= 1;
+        return 0;
+    } else {
+        return a << b;
+    }
+}
+#define __Pyx_lshift_const_{{NAME}}_checking_overflow __Pyx_lshift_{{NAME}}_checking_overflow
+
+
+/////////////// UnaryNegOverflows.proto ///////////////
+
+// from intobject.c
+#define __Pyx_UNARY_NEG_WOULD_OVERFLOW(x)    \
+        (((x) < 0) & ((unsigned long)(x) == 0-(unsigned long)(x)))
diff --git a/contrib/tools/cython_py2/Cython/Utility/Printing.c b/contrib/tools/cython_py2/Cython/Utility/Printing.c
new file mode 100644
index 00000000000..71aa7eafe95
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Printing.c
@@ -0,0 +1,176 @@
+////////////////////// Print.proto //////////////////////
+//@substitute: naming
+
+static int __Pyx_Print(PyObject*, PyObject *, int); /*proto*/
+#if CYTHON_COMPILING_IN_PYPY || PY_MAJOR_VERSION >= 3
+static PyObject* $print_function = 0;
+static PyObject* $print_function_kwargs = 0;
+#endif
+
+////////////////////// Print.cleanup //////////////////////
+//@substitute: naming
+
+#if CYTHON_COMPILING_IN_PYPY || PY_MAJOR_VERSION >= 3
+Py_CLEAR($print_function);
+Py_CLEAR($print_function_kwargs);
+#endif
+
+////////////////////// Print //////////////////////
+//@substitute: naming
+
+#if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION < 3
+static PyObject *__Pyx_GetStdout(void) {
+    PyObject *f = PySys_GetObject((char *)"stdout");
+    if (!f) {
+        PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");
+    }
+    return f;
+}
+
+static int __Pyx_Print(PyObject* f, PyObject *arg_tuple, int newline) {
+    int i;
+
+    if (!f) {
+        if (!(f = __Pyx_GetStdout()))
+            return -1;
+    }
+    Py_INCREF(f);
+    for (i=0; i < PyTuple_GET_SIZE(arg_tuple); i++) {
+        PyObject* v;
+        if (PyFile_SoftSpace(f, 1)) {
+            if (PyFile_WriteString(" ", f) < 0)
+                goto error;
+        }
+        v = PyTuple_GET_ITEM(arg_tuple, i);
+        if (PyFile_WriteObject(v, f, Py_PRINT_RAW) < 0)
+            goto error;
+        if (PyString_Check(v)) {
+            char *s = PyString_AsString(v);
+            Py_ssize_t len = PyString_Size(v);
+            if (len > 0) {
+                // append soft-space if necessary (not using isspace() due to C/C++ problem on MacOS-X)
+                switch (s[len-1]) {
+                    case ' ': break;
+                    case '\f': case '\r': case '\n': case '\t': case '\v':
+                        PyFile_SoftSpace(f, 0);
+                        break;
+                    default:  break;
+                }
+            }
+        }
+    }
+    if (newline) {
+        if (PyFile_WriteString("\n", f) < 0)
+            goto error;
+        PyFile_SoftSpace(f, 0);
+    }
+    Py_DECREF(f);
+    return 0;
+error:
+    Py_DECREF(f);
+    return -1;
+}
+
+#else /* Python 3 has a print function */
+
+static int __Pyx_Print(PyObject* stream, PyObject *arg_tuple, int newline) {
+    PyObject* kwargs = 0;
+    PyObject* result = 0;
+    PyObject* end_string;
+    if (unlikely(!$print_function)) {
+        $print_function = PyObject_GetAttr($builtins_cname, PYIDENT("print"));
+        if (!$print_function)
+            return -1;
+    }
+    if (stream) {
+        kwargs = PyDict_New();
+        if (unlikely(!kwargs))
+            return -1;
+        if (unlikely(PyDict_SetItem(kwargs, PYIDENT("file"), stream) < 0))
+            goto bad;
+        if (!newline) {
+            end_string = PyUnicode_FromStringAndSize(" ", 1);
+            if (unlikely(!end_string))
+                goto bad;
+            if (PyDict_SetItem(kwargs, PYIDENT("end"), end_string) < 0) {
+                Py_DECREF(end_string);
+                goto bad;
+            }
+            Py_DECREF(end_string);
+        }
+    } else if (!newline) {
+        if (unlikely(!$print_function_kwargs)) {
+            $print_function_kwargs = PyDict_New();
+            if (unlikely(!$print_function_kwargs))
+                return -1;
+            end_string = PyUnicode_FromStringAndSize(" ", 1);
+            if (unlikely(!end_string))
+                return -1;
+            if (PyDict_SetItem($print_function_kwargs, PYIDENT("end"), end_string) < 0) {
+                Py_DECREF(end_string);
+                return -1;
+            }
+            Py_DECREF(end_string);
+        }
+        kwargs = $print_function_kwargs;
+    }
+    result = PyObject_Call($print_function, arg_tuple, kwargs);
+    if (unlikely(kwargs) && (kwargs != $print_function_kwargs))
+        Py_DECREF(kwargs);
+    if (!result)
+        return -1;
+    Py_DECREF(result);
+    return 0;
+bad:
+    if (kwargs != $print_function_kwargs)
+        Py_XDECREF(kwargs);
+    return -1;
+}
+#endif
+
+////////////////////// PrintOne.proto //////////////////////
+//@requires: Print
+
+static int __Pyx_PrintOne(PyObject* stream, PyObject *o); /*proto*/
+
+////////////////////// PrintOne //////////////////////
+
+#if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION < 3
+
+static int __Pyx_PrintOne(PyObject* f, PyObject *o) {
+    if (!f) {
+        if (!(f = __Pyx_GetStdout()))
+            return -1;
+    }
+    Py_INCREF(f);
+    if (PyFile_SoftSpace(f, 0)) {
+        if (PyFile_WriteString(" ", f) < 0)
+            goto error;
+    }
+    if (PyFile_WriteObject(o, f, Py_PRINT_RAW) < 0)
+        goto error;
+    if (PyFile_WriteString("\n", f) < 0)
+        goto error;
+    Py_DECREF(f);
+    return 0;
+error:
+    Py_DECREF(f);
+    return -1;
+    /* the line below is just to avoid C compiler
+     * warnings about unused functions */
+    return __Pyx_Print(f, NULL, 0);
+}
+
+#else /* Python 3 has a print function */
+
+static int __Pyx_PrintOne(PyObject* stream, PyObject *o) {
+    int res;
+    PyObject* arg_tuple = PyTuple_Pack(1, o);
+    if (unlikely(!arg_tuple))
+        return -1;
+    res = __Pyx_Print(stream, arg_tuple, 1);
+    Py_DECREF(arg_tuple);
+    return res;
+}
+
+#endif
diff --git a/contrib/tools/cython_py2/Cython/Utility/Profile.c b/contrib/tools/cython_py2/Cython/Utility/Profile.c
new file mode 100644
index 00000000000..3b4d8514949
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/Profile.c
@@ -0,0 +1,383 @@
+/////////////// Profile.proto ///////////////
+//@requires: Exceptions.c::PyErrFetchRestore
+//@substitute: naming
+
+// Note that cPython ignores PyTrace_EXCEPTION,
+// but maybe some other profilers don't.
+
+#ifndef CYTHON_PROFILE
+#if CYTHON_COMPILING_IN_LIMITED_API || CYTHON_COMPILING_IN_PYPY
+  #define CYTHON_PROFILE 0
+#else
+  #define CYTHON_PROFILE 1
+#endif
+#endif
+
+#ifndef CYTHON_TRACE_NOGIL
+  #define CYTHON_TRACE_NOGIL 0
+#else
+  #if CYTHON_TRACE_NOGIL && !defined(CYTHON_TRACE)
+    #define CYTHON_TRACE 1
+  #endif
+#endif
+
+#ifndef CYTHON_TRACE
+  #define CYTHON_TRACE 0
+#endif
+
+#if CYTHON_TRACE
+  #undef CYTHON_PROFILE_REUSE_FRAME
+#endif
+
+#ifndef CYTHON_PROFILE_REUSE_FRAME
+  #define CYTHON_PROFILE_REUSE_FRAME 0
+#endif
+
+#if CYTHON_PROFILE || CYTHON_TRACE
+
+  #include "compile.h"
+  #include "frameobject.h"
+  #include "traceback.h"
+#if PY_VERSION_HEX >= 0x030b00a6 && !defined(PYPY_VERSION)
+  #ifndef Py_BUILD_CORE
+    #define Py_BUILD_CORE 1
+  #endif
+  #include "internal/pycore_frame.h"
+#endif
+
+  #if CYTHON_PROFILE_REUSE_FRAME
+    #define CYTHON_FRAME_MODIFIER static
+    #define CYTHON_FRAME_DEL(frame)
+  #else
+    #define CYTHON_FRAME_MODIFIER
+    #define CYTHON_FRAME_DEL(frame) Py_CLEAR(frame)
+  #endif
+
+  #define __Pyx_TraceDeclarations                                         \
+      static PyCodeObject *$frame_code_cname = NULL;                      \
+      CYTHON_FRAME_MODIFIER PyFrameObject *$frame_cname = NULL;           \
+      int __Pyx_use_tracing = 0;
+
+  #define __Pyx_TraceFrameInit(codeobj)                                   \
+      if (codeobj) $frame_code_cname = (PyCodeObject*) codeobj;
+
+
+#if PY_VERSION_HEX >= 0x030b00a2
+  #if PY_VERSION_HEX >= 0x030C00b1
+  #define __Pyx_IsTracing(tstate, check_tracing, check_funcs) \
+     ((!(check_tracing) || !(tstate)->tracing) && \
+         (!(check_funcs) || (tstate)->c_profilefunc || (CYTHON_TRACE && (tstate)->c_tracefunc)))
+  #else
+  #define __Pyx_IsTracing(tstate, check_tracing, check_funcs) \
+     (unlikely((tstate)->cframe->use_tracing) && \
+         (!(check_tracing) || !(tstate)->tracing) && \
+         (!(check_funcs) || (tstate)->c_profilefunc || (CYTHON_TRACE && (tstate)->c_tracefunc)))
+  #endif
+
+  #define __Pyx_EnterTracing(tstate)  PyThreadState_EnterTracing(tstate)
+  #define __Pyx_LeaveTracing(tstate)  PyThreadState_LeaveTracing(tstate)
+
+#elif PY_VERSION_HEX >= 0x030a00b1
+  #define __Pyx_IsTracing(tstate, check_tracing, check_funcs) \
+     (unlikely((tstate)->cframe->use_tracing) && \
+         (!(check_tracing) || !(tstate)->tracing) && \
+         (!(check_funcs) || (tstate)->c_profilefunc || (CYTHON_TRACE && (tstate)->c_tracefunc)))
+
+  #define __Pyx_EnterTracing(tstate) \
+      do { tstate->tracing++; tstate->cframe->use_tracing = 0; } while (0)
+
+  #define __Pyx_LeaveTracing(tstate) \
+      do { \
+          tstate->tracing--; \
+          tstate->cframe->use_tracing = ((CYTHON_TRACE && tstate->c_tracefunc != NULL) \
+                                 || tstate->c_profilefunc != NULL); \
+      } while (0)
+
+#else
+  #define __Pyx_IsTracing(tstate, check_tracing, check_funcs) \
+     (unlikely((tstate)->use_tracing) && \
+         (!(check_tracing) || !(tstate)->tracing) && \
+         (!(check_funcs) || (tstate)->c_profilefunc || (CYTHON_TRACE && (tstate)->c_tracefunc)))
+
+  #define __Pyx_EnterTracing(tstate) \
+      do { tstate->tracing++; tstate->use_tracing = 0; } while (0)
+
+  #define __Pyx_LeaveTracing(tstate) \
+      do { \
+          tstate->tracing--; \
+          tstate->use_tracing = ((CYTHON_TRACE && tstate->c_tracefunc != NULL) \
+                                         || tstate->c_profilefunc != NULL); \
+      } while (0)
+
+#endif
+
+  #ifdef WITH_THREAD
+  #define __Pyx_TraceCall(funcname, srcfile, firstlineno, nogil, goto_error)             \
+  if (nogil) {                                                                           \
+      if (CYTHON_TRACE_NOGIL) {                                                          \
+          PyThreadState *tstate;                                                         \
+          PyGILState_STATE state = PyGILState_Ensure();                                  \
+          tstate = __Pyx_PyThreadState_Current;                                          \
+          if (__Pyx_IsTracing(tstate, 1, 1)) {                                           \
+              __Pyx_use_tracing = __Pyx_TraceSetupAndCall(&$frame_code_cname, &$frame_cname, tstate, funcname, srcfile, firstlineno);  \
+          }                                                                              \
+          PyGILState_Release(state);                                                     \
+          if (unlikely(__Pyx_use_tracing < 0)) goto_error;                               \
+      }                                                                                  \
+  } else {                                                                               \
+      PyThreadState* tstate = PyThreadState_GET();                                       \
+      if (__Pyx_IsTracing(tstate, 1, 1)) {                                               \
+          __Pyx_use_tracing = __Pyx_TraceSetupAndCall(&$frame_code_cname, &$frame_cname, tstate, funcname, srcfile, firstlineno);  \
+          if (unlikely(__Pyx_use_tracing < 0)) goto_error;                               \
+      }                                                                                  \
+  }
+  #else
+  #define __Pyx_TraceCall(funcname, srcfile, firstlineno, nogil, goto_error)             \
+  {   PyThreadState* tstate = PyThreadState_GET();                                       \
+      if (__Pyx_IsTracing(tstate, 1, 1)) {                                               \
+          __Pyx_use_tracing = __Pyx_TraceSetupAndCall(&$frame_code_cname, &$frame_cname, tstate, funcname, srcfile, firstlineno);  \
+          if (unlikely(__Pyx_use_tracing < 0)) goto_error;                               \
+      }                                                                                  \
+  }
+  #endif
+
+  #define __Pyx_TraceException()                                                           \
+  if (likely(!__Pyx_use_tracing)); else {                                                  \
+      PyThreadState* tstate = __Pyx_PyThreadState_Current;                                 \
+      if (__Pyx_IsTracing(tstate, 0, 1)) {                                                 \
+          __Pyx_EnterTracing(tstate);                                                      \
+          PyObject *exc_info = __Pyx_GetExceptionTuple(tstate);                            \
+          if (exc_info) {                                                                  \
+              if (CYTHON_TRACE && tstate->c_tracefunc)                                     \
+                  tstate->c_tracefunc(                                                     \
+                      tstate->c_traceobj, $frame_cname, PyTrace_EXCEPTION, exc_info);      \
+              tstate->c_profilefunc(                                                       \
+                  tstate->c_profileobj, $frame_cname, PyTrace_EXCEPTION, exc_info);        \
+              Py_DECREF(exc_info);                                                         \
+          }                                                                                \
+          __Pyx_LeaveTracing(tstate);                                                      \
+      }                                                                                    \
+  }
+
+  static void __Pyx_call_return_trace_func(PyThreadState *tstate, PyFrameObject *frame, PyObject *result) {
+      PyObject *type, *value, *traceback;
+      __Pyx_ErrFetchInState(tstate, &type, &value, &traceback);
+      __Pyx_EnterTracing(tstate);
+      if (CYTHON_TRACE && tstate->c_tracefunc)
+          tstate->c_tracefunc(tstate->c_traceobj, frame, PyTrace_RETURN, result);
+      if (tstate->c_profilefunc)
+          tstate->c_profilefunc(tstate->c_profileobj, frame, PyTrace_RETURN, result);
+      CYTHON_FRAME_DEL(frame);
+      __Pyx_LeaveTracing(tstate);
+      __Pyx_ErrRestoreInState(tstate, type, value, traceback);
+  }
+
+  #ifdef WITH_THREAD
+  #define __Pyx_TraceReturn(result, nogil)                                                \
+  if (likely(!__Pyx_use_tracing)); else {                                                 \
+      if (nogil) {                                                                        \
+          if (CYTHON_TRACE_NOGIL) {                                                       \
+              PyThreadState *tstate;                                                      \
+              PyGILState_STATE state = PyGILState_Ensure();                               \
+              tstate = __Pyx_PyThreadState_Current;                                       \
+              if (__Pyx_IsTracing(tstate, 0, 0)) {                                        \
+                  __Pyx_call_return_trace_func(tstate, $frame_cname, (PyObject*)result);  \
+              }                                                                           \
+              PyGILState_Release(state);                                                  \
+          }                                                                               \
+      } else {                                                                            \
+          PyThreadState* tstate = __Pyx_PyThreadState_Current;                            \
+          if (__Pyx_IsTracing(tstate, 0, 0)) {                                            \
+              __Pyx_call_return_trace_func(tstate, $frame_cname, (PyObject*)result);      \
+          }                                                                               \
+      }                                                                                   \
+  }
+  #else
+  #define __Pyx_TraceReturn(result, nogil)                                                \
+  if (likely(!__Pyx_use_tracing)); else {                                                 \
+      PyThreadState* tstate = __Pyx_PyThreadState_Current;                                \
+      if (__Pyx_IsTracing(tstate, 0, 0)) {                                                \
+          __Pyx_call_return_trace_func(tstate, $frame_cname, (PyObject*)result);          \
+      }                                                                                   \
+  }
+  #endif
+
+  static PyCodeObject *__Pyx_createFrameCodeObject(const char *funcname, const char *srcfile, int firstlineno); /*proto*/
+  static int __Pyx_TraceSetupAndCall(PyCodeObject** code, PyFrameObject** frame, PyThreadState* tstate, const char *funcname, const char *srcfile, int firstlineno); /*proto*/
+
+#else
+
+  #define __Pyx_TraceDeclarations
+  #define __Pyx_TraceFrameInit(codeobj)
+  // mark error label as used to avoid compiler warnings
+  #define __Pyx_TraceCall(funcname, srcfile, firstlineno, nogil, goto_error)   if ((1)); else goto_error;
+  #define __Pyx_TraceException()
+  #define __Pyx_TraceReturn(result, nogil)
+
+#endif /* CYTHON_PROFILE */
+
+#if CYTHON_TRACE
+  // see call_trace_protected() in CPython's ceval.c
+  static int __Pyx_call_line_trace_func(PyThreadState *tstate, PyFrameObject *frame, int lineno) {
+      int ret;
+      PyObject *type, *value, *traceback;
+      __Pyx_ErrFetchInState(tstate, &type, &value, &traceback);
+      __Pyx_PyFrame_SetLineNumber(frame, lineno);
+      __Pyx_EnterTracing(tstate);
+
+      ret = tstate->c_tracefunc(tstate->c_traceobj, frame, PyTrace_LINE, NULL);
+
+      __Pyx_LeaveTracing(tstate);
+      if (likely(!ret)) {
+          __Pyx_ErrRestoreInState(tstate, type, value, traceback);
+      } else {
+          Py_XDECREF(type);
+          Py_XDECREF(value);
+          Py_XDECREF(traceback);
+      }
+      return ret;
+  }
+
+  #ifdef WITH_THREAD
+  #define __Pyx_TraceLine(lineno, nogil, goto_error)                                       \
+  if (likely(!__Pyx_use_tracing)); else {                                                  \
+      if (nogil) {                                                                         \
+          if (CYTHON_TRACE_NOGIL) {                                                        \
+              int ret = 0;                                                                 \
+              PyThreadState *tstate;                                                       \
+              PyGILState_STATE state = __Pyx_PyGILState_Ensure();                          \
+              tstate = __Pyx_PyThreadState_Current;                                        \
+              if (__Pyx_IsTracing(tstate, 0, 0) && tstate->c_tracefunc && $frame_cname->f_trace) { \
+                  ret = __Pyx_call_line_trace_func(tstate, $frame_cname, lineno);          \
+              }                                                                            \
+              __Pyx_PyGILState_Release(state);                                             \
+              if (unlikely(ret)) goto_error;                                               \
+          }                                                                                \
+      } else {                                                                             \
+          PyThreadState* tstate = __Pyx_PyThreadState_Current;                             \
+          if (__Pyx_IsTracing(tstate, 0, 0) && tstate->c_tracefunc && $frame_cname->f_trace) { \
+              int ret = __Pyx_call_line_trace_func(tstate, $frame_cname, lineno);          \
+              if (unlikely(ret)) goto_error;                                               \
+          }                                                                                \
+      }                                                                                    \
+  }
+  #else
+  #define __Pyx_TraceLine(lineno, nogil, goto_error)                                       \
+  if (likely(!__Pyx_use_tracing)); else {                                                  \
+      PyThreadState* tstate = __Pyx_PyThreadState_Current;                                 \
+      if (__Pyx_IsTracing(tstate, 0, 0) && tstate->c_tracefunc && $frame_cname->f_trace) { \
+          int ret = __Pyx_call_line_trace_func(tstate, $frame_cname, lineno);              \
+          if (unlikely(ret)) goto_error;                                                   \
+      }                                                                                    \
+  }
+  #endif
+#else
+  // mark error label as used to avoid compiler warnings
+  #define __Pyx_TraceLine(lineno, nogil, goto_error)   if ((1)); else goto_error;
+#endif
+
+/////////////// Profile ///////////////
+//@substitute: naming
+
+#if CYTHON_PROFILE
+
+static int __Pyx_TraceSetupAndCall(PyCodeObject** code,
+                                   PyFrameObject** frame,
+                                   PyThreadState* tstate,
+                                   const char *funcname,
+                                   const char *srcfile,
+                                   int firstlineno) {
+    PyObject *type, *value, *traceback;
+    int retval;
+    if (*frame == NULL || !CYTHON_PROFILE_REUSE_FRAME) {
+        if (*code == NULL) {
+            *code = __Pyx_createFrameCodeObject(funcname, srcfile, firstlineno);
+            if (*code == NULL) return 0;
+        }
+        *frame = PyFrame_New(
+            tstate,                          /*PyThreadState *tstate*/
+            *code,                           /*PyCodeObject *code*/
+            $moddict_cname,                  /*PyObject *globals*/
+            0                                /*PyObject *locals*/
+        );
+        if (*frame == NULL) return 0;
+        if (CYTHON_TRACE && (*frame)->f_trace == NULL) {
+            // this enables "f_lineno" lookup, at least in CPython ...
+            Py_INCREF(Py_None);
+            (*frame)->f_trace = Py_None;
+        }
+#if PY_VERSION_HEX < 0x030400B1
+    } else {
+        (*frame)->f_tstate = tstate;
+#endif
+    }
+    __Pyx_PyFrame_SetLineNumber(*frame, firstlineno);
+
+    retval = 1;
+    __Pyx_EnterTracing(tstate);
+    __Pyx_ErrFetchInState(tstate, &type, &value, &traceback);
+
+    #if CYTHON_TRACE
+    if (tstate->c_tracefunc)
+        retval = tstate->c_tracefunc(tstate->c_traceobj, *frame, PyTrace_CALL, NULL) == 0;
+    if (retval && tstate->c_profilefunc)
+    #endif
+        retval = tstate->c_profilefunc(tstate->c_profileobj, *frame, PyTrace_CALL, NULL) == 0;
+
+    __Pyx_LeaveTracing(tstate);
+    if (retval) {
+        __Pyx_ErrRestoreInState(tstate, type, value, traceback);
+        return __Pyx_IsTracing(tstate, 0, 0) && retval;
+    } else {
+        Py_XDECREF(type);
+        Py_XDECREF(value);
+        Py_XDECREF(traceback);
+        return -1;
+    }
+}
+
+static PyCodeObject *__Pyx_createFrameCodeObject(const char *funcname, const char *srcfile, int firstlineno) {
+    PyCodeObject *py_code = 0;
+
+#if PY_MAJOR_VERSION >= 3
+    py_code = PyCode_NewEmpty(srcfile, funcname, firstlineno);
+    // make CPython use a fresh dict for "f_locals" at need (see GH #1836)
+    if (likely(py_code)) {
+        py_code->co_flags |= CO_OPTIMIZED | CO_NEWLOCALS;
+    }
+#else
+    PyObject *py_srcfile = 0;
+    PyObject *py_funcname = 0;
+
+    py_funcname = PyString_FromString(funcname);
+    if (unlikely(!py_funcname)) goto bad;
+    py_srcfile = PyString_FromString(srcfile);
+    if (unlikely(!py_srcfile)) goto bad;
+
+    py_code = PyCode_New(
+        0,                /*int argcount,*/
+        0,                /*int nlocals,*/
+        0,                /*int stacksize,*/
+        // make CPython use a fresh dict for "f_locals" at need (see GH #1836)
+        CO_OPTIMIZED | CO_NEWLOCALS,  /*int flags,*/
+        $empty_bytes,     /*PyObject *code,*/
+        $empty_tuple,     /*PyObject *consts,*/
+        $empty_tuple,     /*PyObject *names,*/
+        $empty_tuple,     /*PyObject *varnames,*/
+        $empty_tuple,     /*PyObject *freevars,*/
+        $empty_tuple,     /*PyObject *cellvars,*/
+        py_srcfile,       /*PyObject *filename,*/
+        py_funcname,      /*PyObject *name,*/
+        firstlineno,      /*int firstlineno,*/
+        $empty_bytes      /*PyObject *lnotab*/
+    );
+
+bad:
+    Py_XDECREF(py_srcfile);
+    Py_XDECREF(py_funcname);
+#endif
+
+    return py_code;
+}
+
+#endif /* CYTHON_PROFILE */
diff --git a/contrib/tools/cython_py2/Cython/Utility/StringTools.c b/contrib/tools/cython_py2/Cython/Utility/StringTools.c
new file mode 100644
index 00000000000..c49a56950e1
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/StringTools.c
@@ -0,0 +1,1294 @@
+
+//////////////////// IncludeStringH.proto ////////////////////
+
+#include <string.h>
+
+//////////////////// IncludeCppStringH.proto ////////////////////
+
+#include <string>
+
+
+//////////////////// ssize_pyunicode_strlen.proto ////////////////////
+
+static CYTHON_INLINE Py_ssize_t __Pyx_Py_UNICODE_ssize_strlen(const Py_UNICODE *u);/*proto*/
+
+//////////////////// ssize_pyunicode_strlen ////////////////////
+//@requires: pyunicode_strlen
+
+static CYTHON_INLINE Py_ssize_t __Pyx_Py_UNICODE_ssize_strlen(const Py_UNICODE *u) {
+    size_t len = __Pyx_Py_UNICODE_strlen(u);
+    if (unlikely(len > PY_SSIZE_T_MAX)) {
+        PyErr_SetString(PyExc_OverflowError, "Py_UNICODE string is too long");
+        return -1;
+    }
+    return (Py_ssize_t) len;
+}
+
+//////////////////// pyunicode_strlen.proto ///////////////
+
+// There used to be a Py_UNICODE_strlen() in CPython 3.x, but it is deprecated since Py3.3.
+static CYTHON_INLINE size_t __Pyx_Py_UNICODE_strlen(const Py_UNICODE *u); /* proto */
+
+//////////////////// pyunicode_strlen /////////////////////
+
+// Note: will not work in the limited API since Py_UNICODE is not available there.
+// May stop working at some point after Python 3.13 (deprecated)
+static CYTHON_INLINE size_t __Pyx_Py_UNICODE_strlen(const Py_UNICODE *u)
+{
+    const Py_UNICODE *u_end = u;
+    while (*u_end++) ;
+    return (size_t)(u_end - u - 1);
+}
+
+//////////////////// pyunicode_from_unicode.proto //////////////////////
+//@requires: pyunicode_strlen
+
+#define __Pyx_PyUnicode_FromUnicode(u)       PyUnicode_FromUnicode(u, __Pyx_Py_UNICODE_strlen(u))
+#define __Pyx_PyUnicode_FromUnicodeAndLength PyUnicode_FromUnicode
+
+//////////////////// InitStrings.proto ////////////////////
+
+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
+
+//////////////////// InitStrings ////////////////////
+
+#if PY_MAJOR_VERSION >= 3
+static int __Pyx_InitString(__Pyx_StringTabEntry t, PyObject **str) {
+    if (t.is_unicode | t.is_str) {
+        if (t.intern) {
+            *str = PyUnicode_InternFromString(t.s);
+        } else if (t.encoding) {
+            *str = PyUnicode_Decode(t.s, t.n - 1, t.encoding, NULL);
+        } else {
+            *str = PyUnicode_FromStringAndSize(t.s, t.n - 1);
+        }
+    } else {
+        *str = PyBytes_FromStringAndSize(t.s, t.n - 1);
+    }
+    if (!*str)
+        return -1;
+    // initialise cached hash value
+    if (PyObject_Hash(*str) == -1)
+        return -1;
+    return 0;
+}
+#endif
+
+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
+    while (t->p) {
+        #if PY_MAJOR_VERSION >= 3  /* Python 3+ has unicode identifiers */
+        __Pyx_InitString(*t, t->p);
+        #else
+        if (t->is_unicode) {
+            *t->p = PyUnicode_DecodeUTF8(t->s, t->n - 1, NULL);
+        } else if (t->intern) {
+            *t->p = PyString_InternFromString(t->s);
+        } else {
+            *t->p = PyString_FromStringAndSize(t->s, t->n - 1);
+        }
+        if (!*t->p)
+            return -1;
+        // initialise cached hash value
+        if (PyObject_Hash(*t->p) == -1)
+            return -1;
+        #endif
+        ++t;
+    }
+    return 0;
+}
+
+//////////////////// BytesContains.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_BytesContains(PyObject* bytes, char character); /*proto*/
+
+//////////////////// BytesContains ////////////////////
+//@requires: IncludeStringH
+
+static CYTHON_INLINE int __Pyx_BytesContains(PyObject* bytes, char character) {
+    const Py_ssize_t length = PyBytes_GET_SIZE(bytes);
+    char* char_start = PyBytes_AS_STRING(bytes);
+    return memchr(char_start, (unsigned char)character, (size_t)length) != NULL;
+}
+
+
+//////////////////// PyUCS4InUnicode.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_UnicodeContainsUCS4(PyObject* unicode, Py_UCS4 character); /*proto*/
+
+//////////////////// PyUCS4InUnicode ////////////////////
+
+#if PY_VERSION_HEX < 0x03090000 || (defined(PyUnicode_WCHAR_KIND) && defined(PyUnicode_AS_UNICODE))
+
+#if PY_VERSION_HEX < 0x03090000
+#define __Pyx_PyUnicode_AS_UNICODE(op) PyUnicode_AS_UNICODE(op)
+#define __Pyx_PyUnicode_GET_SIZE(op) PyUnicode_GET_SIZE(op)
+#else
+// Avoid calling deprecated C-API functions in Py3.9+ that PEP-623 schedules for removal in Py3.12.
+// https://www.python.org/dev/peps/pep-0623/
+#define __Pyx_PyUnicode_AS_UNICODE(op) (((PyASCIIObject *)(op))->wstr)
+#define __Pyx_PyUnicode_GET_SIZE(op) ((PyCompactUnicodeObject *)(op))->wstr_length
+#endif
+
+#if !defined(Py_UNICODE_SIZE) || Py_UNICODE_SIZE == 2
+static int __Pyx_PyUnicodeBufferContainsUCS4_SP(Py_UNICODE* buffer, Py_ssize_t length, Py_UCS4 character) {
+    /* handle surrogate pairs for Py_UNICODE buffers in 16bit Unicode builds */
+    Py_UNICODE high_val, low_val;
+    Py_UNICODE* pos;
+    high_val = (Py_UNICODE) (0xD800 | (((character - 0x10000) >> 10) & ((1<<10)-1)));
+    low_val  = (Py_UNICODE) (0xDC00 | ( (character - 0x10000)        & ((1<<10)-1)));
+    for (pos=buffer; pos < buffer+length-1; pos++) {
+        if (unlikely((high_val == pos[0]) & (low_val == pos[1]))) return 1;
+    }
+    return 0;
+}
+#endif
+
+static int __Pyx_PyUnicodeBufferContainsUCS4_BMP(Py_UNICODE* buffer, Py_ssize_t length, Py_UCS4 character) {
+    Py_UNICODE uchar;
+    Py_UNICODE* pos;
+    uchar = (Py_UNICODE) character;
+    for (pos=buffer; pos < buffer+length; pos++) {
+        if (unlikely(uchar == pos[0])) return 1;
+    }
+    return 0;
+}
+#endif
+
+static CYTHON_INLINE int __Pyx_UnicodeContainsUCS4(PyObject* unicode, Py_UCS4 character) {
+#if CYTHON_PEP393_ENABLED
+    const int kind = PyUnicode_KIND(unicode);
+    #ifdef PyUnicode_WCHAR_KIND
+    if (likely(kind != PyUnicode_WCHAR_KIND))
+    #endif
+    {
+        Py_ssize_t i;
+        const void* udata = PyUnicode_DATA(unicode);
+        const Py_ssize_t length = PyUnicode_GET_LENGTH(unicode);
+        for (i=0; i < length; i++) {
+            if (unlikely(character == PyUnicode_READ(kind, udata, i))) return 1;
+        }
+        return 0;
+    }
+#elif PY_VERSION_HEX >= 0x03090000
+    #error Cannot use "UChar in Unicode" in Python 3.9 without PEP-393 unicode strings.
+#elif !defined(PyUnicode_AS_UNICODE)
+    #error Cannot use "UChar in Unicode" in Python < 3.9 without Py_UNICODE support.
+#endif
+
+#if PY_VERSION_HEX < 0x03090000 || (defined(PyUnicode_WCHAR_KIND) && defined(PyUnicode_AS_UNICODE))
+#if !defined(Py_UNICODE_SIZE) || Py_UNICODE_SIZE == 2
+    if ((sizeof(Py_UNICODE) == 2) && unlikely(character > 65535)) {
+        return __Pyx_PyUnicodeBufferContainsUCS4_SP(
+            __Pyx_PyUnicode_AS_UNICODE(unicode),
+            __Pyx_PyUnicode_GET_SIZE(unicode),
+            character);
+    } else
+#endif
+    {
+        return __Pyx_PyUnicodeBufferContainsUCS4_BMP(
+            __Pyx_PyUnicode_AS_UNICODE(unicode),
+            __Pyx_PyUnicode_GET_SIZE(unicode),
+            character);
+
+    }
+#endif
+}
+
+
+//////////////////// PyUnicodeContains.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_PyUnicode_ContainsTF(PyObject* substring, PyObject* text, int eq) {
+    int result = PyUnicode_Contains(text, substring);
+    return unlikely(result < 0) ? result : (result == (eq == Py_EQ));
+}
+
+
+//////////////////// CStringEquals.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_StrEq(const char *, const char *); /*proto*/
+
+//////////////////// CStringEquals ////////////////////
+
+static CYTHON_INLINE int __Pyx_StrEq(const char *s1, const char *s2) {
+    while (*s1 != '\0' && *s1 == *s2) { s1++; s2++; }
+    return *s1 == *s2;
+}
+
+
+//////////////////// StrEquals.proto ////////////////////
+//@requires: BytesEquals
+//@requires: UnicodeEquals
+
+#if PY_MAJOR_VERSION >= 3
+#define __Pyx_PyString_Equals __Pyx_PyUnicode_Equals
+#else
+#define __Pyx_PyString_Equals __Pyx_PyBytes_Equals
+#endif
+
+
+//////////////////// UnicodeEquals.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_PyUnicode_Equals(PyObject* s1, PyObject* s2, int equals); /*proto*/
+
+//////////////////// UnicodeEquals ////////////////////
+//@requires: BytesEquals
+
+static CYTHON_INLINE int __Pyx_PyUnicode_Equals(PyObject* s1, PyObject* s2, int equals) {
+#if CYTHON_COMPILING_IN_PYPY || CYTHON_COMPILING_IN_LIMITED_API
+    return PyObject_RichCompareBool(s1, s2, equals);
+#else
+#if PY_MAJOR_VERSION < 3
+    PyObject* owned_ref = NULL;
+#endif
+    int s1_is_unicode, s2_is_unicode;
+    if (s1 == s2) {
+        /* as done by PyObject_RichCompareBool(); also catches the (interned) empty string */
+        goto return_eq;
+    }
+    s1_is_unicode = PyUnicode_CheckExact(s1);
+    s2_is_unicode = PyUnicode_CheckExact(s2);
+#if PY_MAJOR_VERSION < 3
+    if ((s1_is_unicode & (!s2_is_unicode)) && PyString_CheckExact(s2)) {
+        owned_ref = PyUnicode_FromObject(s2);
+        if (unlikely(!owned_ref))
+            return -1;
+        s2 = owned_ref;
+        s2_is_unicode = 1;
+    } else if ((s2_is_unicode & (!s1_is_unicode)) && PyString_CheckExact(s1)) {
+        owned_ref = PyUnicode_FromObject(s1);
+        if (unlikely(!owned_ref))
+            return -1;
+        s1 = owned_ref;
+        s1_is_unicode = 1;
+    } else if (((!s2_is_unicode) & (!s1_is_unicode))) {
+        return __Pyx_PyBytes_Equals(s1, s2, equals);
+    }
+#endif
+    if (s1_is_unicode & s2_is_unicode) {
+        Py_ssize_t length;
+        int kind;
+        void *data1, *data2;
+        if (unlikely(__Pyx_PyUnicode_READY(s1) < 0) || unlikely(__Pyx_PyUnicode_READY(s2) < 0))
+            return -1;
+        length = __Pyx_PyUnicode_GET_LENGTH(s1);
+        if (length != __Pyx_PyUnicode_GET_LENGTH(s2)) {
+            goto return_ne;
+        }
+#if CYTHON_USE_UNICODE_INTERNALS
+        {
+            Py_hash_t hash1, hash2;
+        #if CYTHON_PEP393_ENABLED
+            hash1 = ((PyASCIIObject*)s1)->hash;
+            hash2 = ((PyASCIIObject*)s2)->hash;
+        #else
+            hash1 = ((PyUnicodeObject*)s1)->hash;
+            hash2 = ((PyUnicodeObject*)s2)->hash;
+        #endif
+            if (hash1 != hash2 && hash1 != -1 && hash2 != -1) {
+                goto return_ne;
+            }
+        }
+#endif
+        // len(s1) == len(s2) >= 1  (empty string is interned, and "s1 is not s2")
+        kind = __Pyx_PyUnicode_KIND(s1);
+        if (kind != __Pyx_PyUnicode_KIND(s2)) {
+            goto return_ne;
+        }
+        data1 = __Pyx_PyUnicode_DATA(s1);
+        data2 = __Pyx_PyUnicode_DATA(s2);
+        if (__Pyx_PyUnicode_READ(kind, data1, 0) != __Pyx_PyUnicode_READ(kind, data2, 0)) {
+            goto return_ne;
+        } else if (length == 1) {
+            goto return_eq;
+        } else {
+            int result = memcmp(data1, data2, (size_t)(length * kind));
+            #if PY_MAJOR_VERSION < 3
+            Py_XDECREF(owned_ref);
+            #endif
+            return (equals == Py_EQ) ? (result == 0) : (result != 0);
+        }
+    } else if ((s1 == Py_None) & s2_is_unicode) {
+        goto return_ne;
+    } else if ((s2 == Py_None) & s1_is_unicode) {
+        goto return_ne;
+    } else {
+        int result;
+        PyObject* py_result = PyObject_RichCompare(s1, s2, equals);
+        #if PY_MAJOR_VERSION < 3
+        Py_XDECREF(owned_ref);
+        #endif
+        if (!py_result)
+            return -1;
+        result = __Pyx_PyObject_IsTrue(py_result);
+        Py_DECREF(py_result);
+        return result;
+    }
+return_eq:
+    #if PY_MAJOR_VERSION < 3
+    Py_XDECREF(owned_ref);
+    #endif
+    return (equals == Py_EQ);
+return_ne:
+    #if PY_MAJOR_VERSION < 3
+    Py_XDECREF(owned_ref);
+    #endif
+    return (equals == Py_NE);
+#endif
+}
+
+
+//////////////////// BytesEquals.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_PyBytes_Equals(PyObject* s1, PyObject* s2, int equals); /*proto*/
+
+//////////////////// BytesEquals ////////////////////
+//@requires: IncludeStringH
+
+static CYTHON_INLINE int __Pyx_PyBytes_Equals(PyObject* s1, PyObject* s2, int equals) {
+#if CYTHON_COMPILING_IN_PYPY || CYTHON_COMPILING_IN_LIMITED_API
+    return PyObject_RichCompareBool(s1, s2, equals);
+#else
+    if (s1 == s2) {
+        /* as done by PyObject_RichCompareBool(); also catches the (interned) empty string */
+        return (equals == Py_EQ);
+    } else if (PyBytes_CheckExact(s1) & PyBytes_CheckExact(s2)) {
+        const char *ps1, *ps2;
+        Py_ssize_t length = PyBytes_GET_SIZE(s1);
+        if (length != PyBytes_GET_SIZE(s2))
+            return (equals == Py_NE);
+        // len(s1) == len(s2) >= 1  (empty string is interned, and "s1 is not s2")
+        ps1 = PyBytes_AS_STRING(s1);
+        ps2 = PyBytes_AS_STRING(s2);
+        if (ps1[0] != ps2[0]) {
+            return (equals == Py_NE);
+        } else if (length == 1) {
+            return (equals == Py_EQ);
+        } else {
+            int result;
+#if CYTHON_USE_UNICODE_INTERNALS && (PY_VERSION_HEX < 0x030B0000)
+            Py_hash_t hash1, hash2;
+            hash1 = ((PyBytesObject*)s1)->ob_shash;
+            hash2 = ((PyBytesObject*)s2)->ob_shash;
+            if (hash1 != hash2 && hash1 != -1 && hash2 != -1) {
+                return (equals == Py_NE);
+            }
+#endif
+            result = memcmp(ps1, ps2, (size_t)length);
+            return (equals == Py_EQ) ? (result == 0) : (result != 0);
+        }
+    } else if ((s1 == Py_None) & PyBytes_CheckExact(s2)) {
+        return (equals == Py_NE);
+    } else if ((s2 == Py_None) & PyBytes_CheckExact(s1)) {
+        return (equals == Py_NE);
+    } else {
+        int result;
+        PyObject* py_result = PyObject_RichCompare(s1, s2, equals);
+        if (!py_result)
+            return -1;
+        result = __Pyx_PyObject_IsTrue(py_result);
+        Py_DECREF(py_result);
+        return result;
+    }
+#endif
+}
+
+//////////////////// GetItemIntByteArray.proto ////////////////////
+
+#define __Pyx_GetItemInt_ByteArray(o, i, type, is_signed, to_py_func, is_list, wraparound, boundscheck) \
+    (__Pyx_fits_Py_ssize_t(i, type, is_signed) ? \
+    __Pyx_GetItemInt_ByteArray_Fast(o, (Py_ssize_t)i, wraparound, boundscheck) : \
+    (PyErr_SetString(PyExc_IndexError, "bytearray index out of range"), -1))
+
+static CYTHON_INLINE int __Pyx_GetItemInt_ByteArray_Fast(PyObject* string, Py_ssize_t i,
+                                                         int wraparound, int boundscheck);
+
+//////////////////// GetItemIntByteArray ////////////////////
+
+static CYTHON_INLINE int __Pyx_GetItemInt_ByteArray_Fast(PyObject* string, Py_ssize_t i,
+                                                         int wraparound, int boundscheck) {
+    Py_ssize_t length;
+    if (wraparound | boundscheck) {
+        length = PyByteArray_GET_SIZE(string);
+        if (wraparound & unlikely(i < 0)) i += length;
+        if ((!boundscheck) || likely(__Pyx_is_valid_index(i, length))) {
+            return (unsigned char) (PyByteArray_AS_STRING(string)[i]);
+        } else {
+            PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
+            return -1;
+        }
+    } else {
+        return (unsigned char) (PyByteArray_AS_STRING(string)[i]);
+    }
+}
+
+
+//////////////////// SetItemIntByteArray.proto ////////////////////
+
+#define __Pyx_SetItemInt_ByteArray(o, i, v, type, is_signed, to_py_func, is_list, wraparound, boundscheck) \
+    (__Pyx_fits_Py_ssize_t(i, type, is_signed) ? \
+    __Pyx_SetItemInt_ByteArray_Fast(o, (Py_ssize_t)i, v, wraparound, boundscheck) : \
+    (PyErr_SetString(PyExc_IndexError, "bytearray index out of range"), -1))
+
+static CYTHON_INLINE int __Pyx_SetItemInt_ByteArray_Fast(PyObject* string, Py_ssize_t i, unsigned char v,
+                                                         int wraparound, int boundscheck);
+
+//////////////////// SetItemIntByteArray ////////////////////
+
+static CYTHON_INLINE int __Pyx_SetItemInt_ByteArray_Fast(PyObject* string, Py_ssize_t i, unsigned char v,
+                                                         int wraparound, int boundscheck) {
+    Py_ssize_t length;
+    if (wraparound | boundscheck) {
+        length = PyByteArray_GET_SIZE(string);
+        if (wraparound & unlikely(i < 0)) i += length;
+        if ((!boundscheck) || likely(__Pyx_is_valid_index(i, length))) {
+            PyByteArray_AS_STRING(string)[i] = (char) v;
+            return 0;
+        } else {
+            PyErr_SetString(PyExc_IndexError, "bytearray index out of range");
+            return -1;
+        }
+    } else {
+        PyByteArray_AS_STRING(string)[i] = (char) v;
+        return 0;
+    }
+}
+
+
+//////////////////// GetItemIntUnicode.proto ////////////////////
+
+#define __Pyx_GetItemInt_Unicode(o, i, type, is_signed, to_py_func, is_list, wraparound, boundscheck) \
+    (__Pyx_fits_Py_ssize_t(i, type, is_signed) ? \
+    __Pyx_GetItemInt_Unicode_Fast(o, (Py_ssize_t)i, wraparound, boundscheck) : \
+    (PyErr_SetString(PyExc_IndexError, "string index out of range"), (Py_UCS4)-1))
+
+static CYTHON_INLINE Py_UCS4 __Pyx_GetItemInt_Unicode_Fast(PyObject* ustring, Py_ssize_t i,
+                                                           int wraparound, int boundscheck);
+
+//////////////////// GetItemIntUnicode ////////////////////
+
+static CYTHON_INLINE Py_UCS4 __Pyx_GetItemInt_Unicode_Fast(PyObject* ustring, Py_ssize_t i,
+                                                           int wraparound, int boundscheck) {
+    Py_ssize_t length;
+    if (unlikely(__Pyx_PyUnicode_READY(ustring) < 0)) return (Py_UCS4)-1;
+    if (wraparound | boundscheck) {
+        length = __Pyx_PyUnicode_GET_LENGTH(ustring);
+        if (wraparound & unlikely(i < 0)) i += length;
+        if ((!boundscheck) || likely(__Pyx_is_valid_index(i, length))) {
+            return __Pyx_PyUnicode_READ_CHAR(ustring, i);
+        } else {
+            PyErr_SetString(PyExc_IndexError, "string index out of range");
+            return (Py_UCS4)-1;
+        }
+    } else {
+        return __Pyx_PyUnicode_READ_CHAR(ustring, i);
+    }
+}
+
+
+/////////////// decode_c_string_utf16.proto ///////////////
+
+static CYTHON_INLINE PyObject *__Pyx_PyUnicode_DecodeUTF16(const char *s, Py_ssize_t size, const char *errors) {
+    int byteorder = 0;
+    return PyUnicode_DecodeUTF16(s, size, errors, &byteorder);
+}
+static CYTHON_INLINE PyObject *__Pyx_PyUnicode_DecodeUTF16LE(const char *s, Py_ssize_t size, const char *errors) {
+    int byteorder = -1;
+    return PyUnicode_DecodeUTF16(s, size, errors, &byteorder);
+}
+static CYTHON_INLINE PyObject *__Pyx_PyUnicode_DecodeUTF16BE(const char *s, Py_ssize_t size, const char *errors) {
+    int byteorder = 1;
+    return PyUnicode_DecodeUTF16(s, size, errors, &byteorder);
+}
+
+/////////////// decode_cpp_string.proto ///////////////
+//@requires: IncludeCppStringH
+//@requires: decode_c_bytes
+
+static CYTHON_INLINE PyObject* __Pyx_decode_cpp_string(
+         std::string_view cppstring, Py_ssize_t start, Py_ssize_t stop,
+         const char* encoding, const char* errors,
+         PyObject* (*decode_func)(const char *s, Py_ssize_t size, const char *errors)) {
+    return __Pyx_decode_c_bytes(
+        cppstring.data(), cppstring.size(), start, stop, encoding, errors, decode_func);
+}
+
+/////////////// decode_c_string.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_decode_c_string(
+         const char* cstring, Py_ssize_t start, Py_ssize_t stop,
+         const char* encoding, const char* errors,
+         PyObject* (*decode_func)(const char *s, Py_ssize_t size, const char *errors));
+
+/////////////// decode_c_string ///////////////
+//@requires: IncludeStringH
+//@requires: decode_c_string_utf16
+//@substitute: naming
+
+/* duplicate code to avoid calling strlen() if start >= 0 and stop >= 0 */
+static CYTHON_INLINE PyObject* __Pyx_decode_c_string(
+         const char* cstring, Py_ssize_t start, Py_ssize_t stop,
+         const char* encoding, const char* errors,
+         PyObject* (*decode_func)(const char *s, Py_ssize_t size, const char *errors)) {
+    Py_ssize_t length;
+    if (unlikely((start < 0) | (stop < 0))) {
+        size_t slen = strlen(cstring);
+        if (unlikely(slen > (size_t) PY_SSIZE_T_MAX)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "c-string too long to convert to Python");
+            return NULL;
+        }
+        length = (Py_ssize_t) slen;
+        if (start < 0) {
+            start += length;
+            if (start < 0)
+                start = 0;
+        }
+        if (stop < 0)
+            stop += length;
+    }
+    if (unlikely(stop <= start))
+        return __Pyx_NewRef($empty_unicode);
+    length = stop - start;
+    cstring += start;
+    if (decode_func) {
+        return decode_func(cstring, length, errors);
+    } else {
+        return PyUnicode_Decode(cstring, length, encoding, errors);
+    }
+}
+
+/////////////// decode_c_bytes.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_decode_c_bytes(
+         const char* cstring, Py_ssize_t length, Py_ssize_t start, Py_ssize_t stop,
+         const char* encoding, const char* errors,
+         PyObject* (*decode_func)(const char *s, Py_ssize_t size, const char *errors));
+
+/////////////// decode_c_bytes ///////////////
+//@requires: decode_c_string_utf16
+//@substitute: naming
+
+static CYTHON_INLINE PyObject* __Pyx_decode_c_bytes(
+         const char* cstring, Py_ssize_t length, Py_ssize_t start, Py_ssize_t stop,
+         const char* encoding, const char* errors,
+         PyObject* (*decode_func)(const char *s, Py_ssize_t size, const char *errors)) {
+    if (unlikely((start < 0) | (stop < 0))) {
+        if (start < 0) {
+            start += length;
+            if (start < 0)
+                start = 0;
+        }
+        if (stop < 0)
+            stop += length;
+    }
+    if (stop > length)
+        stop = length;
+    if (unlikely(stop <= start))
+        return __Pyx_NewRef($empty_unicode);
+    length = stop - start;
+    cstring += start;
+    if (decode_func) {
+        return decode_func(cstring, length, errors);
+    } else {
+        return PyUnicode_Decode(cstring, length, encoding, errors);
+    }
+}
+
+/////////////// decode_bytes.proto ///////////////
+//@requires: decode_c_bytes
+
+static CYTHON_INLINE PyObject* __Pyx_decode_bytes(
+         PyObject* string, Py_ssize_t start, Py_ssize_t stop,
+         const char* encoding, const char* errors,
+         PyObject* (*decode_func)(const char *s, Py_ssize_t size, const char *errors)) {
+    char* as_c_string;
+    Py_ssize_t size;
+#if CYTHON_ASSUME_SAFE_MACROS
+    as_c_string = PyBytes_AS_STRING(string);
+    size = PyBytes_GET_SIZE(string);
+#else
+    if (PyBytes_AsStringAndSize(string, &as_c_string, &size) < 0) {
+        return NULL;
+    }
+#endif
+    return __Pyx_decode_c_bytes(
+        as_c_string, size,
+        start, stop, encoding, errors, decode_func);
+}
+
+/////////////// decode_bytearray.proto ///////////////
+//@requires: decode_c_bytes
+
+static CYTHON_INLINE PyObject* __Pyx_decode_bytearray(
+         PyObject* string, Py_ssize_t start, Py_ssize_t stop,
+         const char* encoding, const char* errors,
+         PyObject* (*decode_func)(const char *s, Py_ssize_t size, const char *errors)) {
+    char* as_c_string;
+    Py_ssize_t size;
+#if CYTHON_ASSUME_SAFE_MACROS
+    as_c_string = PyByteArray_AS_STRING(string);
+    size = PyByteArray_GET_SIZE(string);
+#else
+    if (!(as_c_string = PyByteArray_AsString(string))) return NULL;
+    if ((size = PyByteArray_Size(string)) < 0) return NULL;
+#endif
+    return __Pyx_decode_c_bytes(
+        as_c_string, size,
+        start, stop, encoding, errors, decode_func);
+}
+
+/////////////// PyUnicode_Substring.proto ///////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyUnicode_Substring(
+            PyObject* text, Py_ssize_t start, Py_ssize_t stop);
+
+/////////////// PyUnicode_Substring ///////////////
+//@substitute: naming
+
+static CYTHON_INLINE PyObject* __Pyx_PyUnicode_Substring(
+            PyObject* text, Py_ssize_t start, Py_ssize_t stop) {
+    Py_ssize_t length;
+    if (unlikely(__Pyx_PyUnicode_READY(text) == -1)) return NULL;
+    length = __Pyx_PyUnicode_GET_LENGTH(text);
+    if (start < 0) {
+        start += length;
+        if (start < 0)
+            start = 0;
+    }
+    if (stop < 0)
+        stop += length;
+    else if (stop > length)
+        stop = length;
+    if (stop <= start)
+        return __Pyx_NewRef($empty_unicode);
+    if (start == 0 && stop == length)
+        return __Pyx_NewRef(text);
+#if CYTHON_PEP393_ENABLED
+    return PyUnicode_FromKindAndData(PyUnicode_KIND(text),
+        PyUnicode_1BYTE_DATA(text) + start*PyUnicode_KIND(text), stop-start);
+#else
+    return PyUnicode_FromUnicode(PyUnicode_AS_UNICODE(text)+start, stop-start);
+#endif
+}
+
+
+/////////////// py_unicode_istitle.proto ///////////////
+
+// Py_UNICODE_ISTITLE() doesn't match unicode.istitle() as the latter
+// additionally allows character that comply with Py_UNICODE_ISUPPER()
+
+#if PY_VERSION_HEX < 0x030200A2
+static CYTHON_INLINE int __Pyx_Py_UNICODE_ISTITLE(Py_UNICODE uchar)
+#else
+static CYTHON_INLINE int __Pyx_Py_UNICODE_ISTITLE(Py_UCS4 uchar)
+#endif
+{
+    return Py_UNICODE_ISTITLE(uchar) || Py_UNICODE_ISUPPER(uchar);
+}
+
+
+/////////////// unicode_tailmatch.proto ///////////////
+
+static int __Pyx_PyUnicode_Tailmatch(
+    PyObject* s, PyObject* substr, Py_ssize_t start, Py_ssize_t end, int direction); /*proto*/
+
+/////////////// unicode_tailmatch ///////////////
+
+// Python's unicode.startswith() and unicode.endswith() support a
+// tuple of prefixes/suffixes, whereas it's much more common to
+// test for a single unicode string.
+
+static int __Pyx_PyUnicode_TailmatchTuple(PyObject* s, PyObject* substrings,
+                                          Py_ssize_t start, Py_ssize_t end, int direction) {
+    Py_ssize_t i, count = PyTuple_GET_SIZE(substrings);
+    for (i = 0; i < count; i++) {
+        Py_ssize_t result;
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+        result = PyUnicode_Tailmatch(s, PyTuple_GET_ITEM(substrings, i),
+                                     start, end, direction);
+#else
+        PyObject* sub = PySequence_ITEM(substrings, i);
+        if (unlikely(!sub)) return -1;
+        result = PyUnicode_Tailmatch(s, sub, start, end, direction);
+        Py_DECREF(sub);
+#endif
+        if (result) {
+            return (int) result;
+        }
+    }
+    return 0;
+}
+
+static int __Pyx_PyUnicode_Tailmatch(PyObject* s, PyObject* substr,
+                                     Py_ssize_t start, Py_ssize_t end, int direction) {
+    if (unlikely(PyTuple_Check(substr))) {
+        return __Pyx_PyUnicode_TailmatchTuple(s, substr, start, end, direction);
+    }
+    return (int) PyUnicode_Tailmatch(s, substr, start, end, direction);
+}
+
+
+/////////////// bytes_tailmatch.proto ///////////////
+
+static int __Pyx_PyBytes_SingleTailmatch(PyObject* self, PyObject* arg,
+                                         Py_ssize_t start, Py_ssize_t end, int direction); /*proto*/
+static int __Pyx_PyBytes_Tailmatch(PyObject* self, PyObject* substr,
+                                   Py_ssize_t start, Py_ssize_t end, int direction); /*proto*/
+
+/////////////// bytes_tailmatch ///////////////
+
+static int __Pyx_PyBytes_SingleTailmatch(PyObject* self, PyObject* arg,
+                                         Py_ssize_t start, Py_ssize_t end, int direction) {
+    const char* self_ptr = PyBytes_AS_STRING(self);
+    Py_ssize_t self_len = PyBytes_GET_SIZE(self);
+    const char* sub_ptr;
+    Py_ssize_t sub_len;
+    int retval;
+
+    Py_buffer view;
+    view.obj = NULL;
+
+    if ( PyBytes_Check(arg) ) {
+        sub_ptr = PyBytes_AS_STRING(arg);
+        sub_len = PyBytes_GET_SIZE(arg);
+    }
+#if PY_MAJOR_VERSION < 3
+    // Python 2.x allows mixing unicode and str
+    else if ( PyUnicode_Check(arg) ) {
+        return (int) PyUnicode_Tailmatch(self, arg, start, end, direction);
+    }
+#endif
+    else {
+        if (unlikely(PyObject_GetBuffer(arg, &view, PyBUF_SIMPLE) == -1))
+            return -1;
+        sub_ptr = (const char*) view.buf;
+        sub_len = view.len;
+    }
+
+    if (end > self_len)
+        end = self_len;
+    else if (end < 0)
+        end += self_len;
+    if (end < 0)
+        end = 0;
+    if (start < 0)
+        start += self_len;
+    if (start < 0)
+        start = 0;
+
+    if (direction > 0) {
+        /* endswith */
+        if (end-sub_len > start)
+            start = end - sub_len;
+    }
+
+    if (start + sub_len <= end)
+        retval = !memcmp(self_ptr+start, sub_ptr, (size_t)sub_len);
+    else
+        retval = 0;
+
+    if (view.obj)
+        PyBuffer_Release(&view);
+
+    return retval;
+}
+
+static int __Pyx_PyBytes_TailmatchTuple(PyObject* self, PyObject* substrings,
+                                        Py_ssize_t start, Py_ssize_t end, int direction) {
+    Py_ssize_t i, count = PyTuple_GET_SIZE(substrings);
+    for (i = 0; i < count; i++) {
+        int result;
+#if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+        result = __Pyx_PyBytes_SingleTailmatch(self, PyTuple_GET_ITEM(substrings, i),
+                                               start, end, direction);
+#else
+        PyObject* sub = PySequence_ITEM(substrings, i);
+        if (unlikely(!sub)) return -1;
+        result = __Pyx_PyBytes_SingleTailmatch(self, sub, start, end, direction);
+        Py_DECREF(sub);
+#endif
+        if (result) {
+            return result;
+        }
+    }
+    return 0;
+}
+
+static int __Pyx_PyBytes_Tailmatch(PyObject* self, PyObject* substr,
+                                   Py_ssize_t start, Py_ssize_t end, int direction) {
+    if (unlikely(PyTuple_Check(substr))) {
+        return __Pyx_PyBytes_TailmatchTuple(self, substr, start, end, direction);
+    }
+
+    return __Pyx_PyBytes_SingleTailmatch(self, substr, start, end, direction);
+}
+
+
+/////////////// str_tailmatch.proto ///////////////
+
+static CYTHON_INLINE int __Pyx_PyStr_Tailmatch(PyObject* self, PyObject* arg, Py_ssize_t start,
+                                               Py_ssize_t end, int direction); /*proto*/
+
+/////////////// str_tailmatch ///////////////
+//@requires: bytes_tailmatch
+//@requires: unicode_tailmatch
+
+static CYTHON_INLINE int __Pyx_PyStr_Tailmatch(PyObject* self, PyObject* arg, Py_ssize_t start,
+                                               Py_ssize_t end, int direction)
+{
+    // We do not use a C compiler macro here to avoid "unused function"
+    // warnings for the *_Tailmatch() function that is not being used in
+    // the specific CPython version.  The C compiler will generate the same
+    // code anyway, and will usually just remove the unused function.
+    if (PY_MAJOR_VERSION < 3)
+        return __Pyx_PyBytes_Tailmatch(self, arg, start, end, direction);
+    else
+        return __Pyx_PyUnicode_Tailmatch(self, arg, start, end, direction);
+}
+
+
+/////////////// bytes_index.proto ///////////////
+
+static CYTHON_INLINE char __Pyx_PyBytes_GetItemInt(PyObject* bytes, Py_ssize_t index, int check_bounds); /*proto*/
+
+/////////////// bytes_index ///////////////
+
+static CYTHON_INLINE char __Pyx_PyBytes_GetItemInt(PyObject* bytes, Py_ssize_t index, int check_bounds) {
+    if (index < 0)
+        index += PyBytes_GET_SIZE(bytes);
+    if (check_bounds) {
+        Py_ssize_t size = PyBytes_GET_SIZE(bytes);
+        if (unlikely(!__Pyx_is_valid_index(index, size))) {
+            PyErr_SetString(PyExc_IndexError, "string index out of range");
+            return (char) -1;
+        }
+    }
+    return PyBytes_AS_STRING(bytes)[index];
+}
+
+
+//////////////////// StringJoin.proto ////////////////////
+
+#if PY_MAJOR_VERSION < 3
+#define __Pyx_PyString_Join __Pyx_PyBytes_Join
+#define __Pyx_PyBaseString_Join(s, v) (PyUnicode_CheckExact(s) ? PyUnicode_Join(s, v) : __Pyx_PyBytes_Join(s, v))
+#else
+#define __Pyx_PyString_Join PyUnicode_Join
+#define __Pyx_PyBaseString_Join PyUnicode_Join
+#endif
+static CYTHON_INLINE PyObject* __Pyx_PyBytes_Join(PyObject* sep, PyObject* values); /*proto*/
+
+//////////////////// StringJoin ////////////////////
+//@requires: ObjectHandling.c::PyObjectCallMethod1
+
+static CYTHON_INLINE PyObject* __Pyx_PyBytes_Join(PyObject* sep, PyObject* values) {
+    // avoid unused function
+    (void) __Pyx_PyObject_CallMethod1;
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION < 3
+    return _PyString_Join(sep, values);
+#elif CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x030d0000
+    return _PyBytes_Join(sep, values);
+#else
+    return __Pyx_PyObject_CallMethod1(sep, PYIDENT("join"), values);
+#endif
+}
+
+
+/////////////// JoinPyUnicode.proto ///////////////
+
+static PyObject* __Pyx_PyUnicode_Join(PyObject* value_tuple, Py_ssize_t value_count, Py_ssize_t result_ulength,
+                                      Py_UCS4 max_char);
+
+/////////////// JoinPyUnicode ///////////////
+//@requires: IncludeStringH
+//@substitute: naming
+
+static PyObject* __Pyx_PyUnicode_Join(PyObject* value_tuple, Py_ssize_t value_count, Py_ssize_t result_ulength,
+                                      Py_UCS4 max_char) {
+#if CYTHON_USE_UNICODE_INTERNALS && CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS
+    PyObject *result_uval;
+    int result_ukind, kind_shift;
+    Py_ssize_t i, char_pos;
+    void *result_udata;
+    CYTHON_MAYBE_UNUSED_VAR(max_char);
+#if CYTHON_PEP393_ENABLED
+    // Py 3.3+  (post PEP-393)
+    result_uval = PyUnicode_New(result_ulength, max_char);
+    if (unlikely(!result_uval)) return NULL;
+    result_ukind = (max_char <= 255) ? PyUnicode_1BYTE_KIND : (max_char <= 65535) ? PyUnicode_2BYTE_KIND : PyUnicode_4BYTE_KIND;
+    kind_shift = (result_ukind == PyUnicode_4BYTE_KIND) ? 2 : result_ukind - 1;
+    result_udata = PyUnicode_DATA(result_uval);
+#else
+    // Py 2.x/3.2  (pre PEP-393)
+    result_uval = PyUnicode_FromUnicode(NULL, result_ulength);
+    if (unlikely(!result_uval)) return NULL;
+    result_ukind = sizeof(Py_UNICODE);
+    kind_shift = (result_ukind == 4) ? 2 : result_ukind - 1;
+    result_udata = PyUnicode_AS_UNICODE(result_uval);
+#endif
+    assert(kind_shift == 2 || kind_shift == 1 || kind_shift == 0);
+
+    char_pos = 0;
+    for (i=0; i < value_count; i++) {
+        int ukind;
+        Py_ssize_t ulength;
+        void *udata;
+        PyObject *uval = PyTuple_GET_ITEM(value_tuple, i);
+        if (unlikely(__Pyx_PyUnicode_READY(uval)))
+            goto bad;
+        ulength = __Pyx_PyUnicode_GET_LENGTH(uval);
+        if (unlikely(!ulength))
+            continue;
+        if (unlikely((PY_SSIZE_T_MAX >> kind_shift) - ulength < char_pos))
+            goto overflow;
+        ukind = __Pyx_PyUnicode_KIND(uval);
+        udata = __Pyx_PyUnicode_DATA(uval);
+        if (!CYTHON_PEP393_ENABLED || ukind == result_ukind) {
+            memcpy((char *)result_udata + (char_pos << kind_shift), udata, (size_t) (ulength << kind_shift));
+        } else {
+            #if PY_VERSION_HEX >= 0x030d0000
+            if (unlikely(PyUnicode_CopyCharacters(result_uval, char_pos, uval, 0, ulength) < 0)) goto bad;
+            #elif CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030300F0 || defined(_PyUnicode_FastCopyCharacters)
+            _PyUnicode_FastCopyCharacters(result_uval, char_pos, uval, 0, ulength);
+            #else
+            Py_ssize_t j;
+            for (j=0; j < ulength; j++) {
+                Py_UCS4 uchar = __Pyx_PyUnicode_READ(ukind, udata, j);
+                __Pyx_PyUnicode_WRITE(result_ukind, result_udata, char_pos+j, uchar);
+            }
+            #endif
+        }
+        char_pos += ulength;
+    }
+    return result_uval;
+overflow:
+    PyErr_SetString(PyExc_OverflowError, "join() result is too long for a Python string");
+bad:
+    Py_DECREF(result_uval);
+    return NULL;
+#else
+    // non-CPython fallback
+    CYTHON_UNUSED_VAR(max_char);
+    CYTHON_UNUSED_VAR(result_ulength);
+    CYTHON_UNUSED_VAR(value_count);
+    return PyUnicode_Join($empty_unicode, value_tuple);
+#endif
+}
+
+
+/////////////// BuildPyUnicode.proto ///////////////
+
+static PyObject* __Pyx_PyUnicode_BuildFromAscii(Py_ssize_t ulength, char* chars, int clength,
+                                                int prepend_sign, char padding_char);
+
+/////////////// BuildPyUnicode ///////////////
+
+// Create a PyUnicode object from an ASCII char*, e.g. a formatted number.
+
+static PyObject* __Pyx_PyUnicode_BuildFromAscii(Py_ssize_t ulength, char* chars, int clength,
+                                                int prepend_sign, char padding_char) {
+    PyObject *uval;
+    Py_ssize_t uoffset = ulength - clength;
+#if CYTHON_USE_UNICODE_INTERNALS
+    Py_ssize_t i;
+#if CYTHON_PEP393_ENABLED
+    // Py 3.3+  (post PEP-393)
+    void *udata;
+    uval = PyUnicode_New(ulength, 127);
+    if (unlikely(!uval)) return NULL;
+    udata = PyUnicode_DATA(uval);
+#else
+    // Py 2.x/3.2  (pre PEP-393)
+    Py_UNICODE *udata;
+    uval = PyUnicode_FromUnicode(NULL, ulength);
+    if (unlikely(!uval)) return NULL;
+    udata = PyUnicode_AS_UNICODE(uval);
+#endif
+    if (uoffset > 0) {
+        i = 0;
+        if (prepend_sign) {
+            __Pyx_PyUnicode_WRITE(PyUnicode_1BYTE_KIND, udata, 0, '-');
+            i++;
+        }
+        for (; i < uoffset; i++) {
+            __Pyx_PyUnicode_WRITE(PyUnicode_1BYTE_KIND, udata, i, padding_char);
+        }
+    }
+    for (i=0; i < clength; i++) {
+        __Pyx_PyUnicode_WRITE(PyUnicode_1BYTE_KIND, udata, uoffset+i, chars[i]);
+    }
+
+#else
+    // non-CPython
+    {
+        PyObject *sign = NULL, *padding = NULL;
+        uval = NULL;
+        if (uoffset > 0) {
+            prepend_sign = !!prepend_sign;
+            if (uoffset > prepend_sign) {
+                padding = PyUnicode_FromOrdinal(padding_char);
+                if (likely(padding) && uoffset > prepend_sign + 1) {
+                    PyObject *tmp;
+                    PyObject *repeat = PyInt_FromSsize_t(uoffset - prepend_sign);
+                    if (unlikely(!repeat)) goto done_or_error;
+                    tmp = PyNumber_Multiply(padding, repeat);
+                    Py_DECREF(repeat);
+                    Py_DECREF(padding);
+                    padding = tmp;
+                }
+                if (unlikely(!padding)) goto done_or_error;
+            }
+            if (prepend_sign) {
+                sign = PyUnicode_FromOrdinal('-');
+                if (unlikely(!sign)) goto done_or_error;
+            }
+        }
+
+        uval = PyUnicode_DecodeASCII(chars, clength, NULL);
+        if (likely(uval) && padding) {
+            PyObject *tmp = PyNumber_Add(padding, uval);
+            Py_DECREF(uval);
+            uval = tmp;
+        }
+        if (likely(uval) && sign) {
+            PyObject *tmp = PyNumber_Add(sign, uval);
+            Py_DECREF(uval);
+            uval = tmp;
+        }
+done_or_error:
+        Py_XDECREF(padding);
+        Py_XDECREF(sign);
+    }
+#endif
+
+    return uval;
+}
+
+
+//////////////////// ByteArrayAppendObject.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_PyByteArray_AppendObject(PyObject* bytearray, PyObject* value);
+
+//////////////////// ByteArrayAppendObject ////////////////////
+//@requires: ByteArrayAppend
+
+static CYTHON_INLINE int __Pyx_PyByteArray_AppendObject(PyObject* bytearray, PyObject* value) {
+    Py_ssize_t ival;
+#if PY_MAJOR_VERSION < 3
+    if (unlikely(PyString_Check(value))) {
+        if (unlikely(PyString_GET_SIZE(value) != 1)) {
+            PyErr_SetString(PyExc_ValueError, "string must be of size 1");
+            return -1;
+        }
+        ival = (unsigned char) (PyString_AS_STRING(value)[0]);
+    } else
+#endif
+#if CYTHON_USE_PYLONG_INTERNALS
+    if (likely(PyLong_CheckExact(value)) && likely(__Pyx_PyLong_IsCompact(value))) {
+        if (__Pyx_PyLong_IsZero(value)) {
+            ival = 0;
+        } else {
+            ival = __Pyx_PyLong_CompactValue(value);
+            if (unlikely(ival > 255)) goto bad_range;
+        }
+    } else
+#endif
+    {
+        // CPython calls PyNumber_Index() internally
+        ival = __Pyx_PyIndex_AsSsize_t(value);
+        if (unlikely(!__Pyx_is_valid_index(ival, 256))) {
+            if (ival == -1 && PyErr_Occurred())
+                return -1;
+            goto bad_range;
+        }
+    }
+    return __Pyx_PyByteArray_Append(bytearray, ival);
+bad_range:
+    PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
+    return -1;
+}
+
+//////////////////// ByteArrayAppend.proto ////////////////////
+
+static CYTHON_INLINE int __Pyx_PyByteArray_Append(PyObject* bytearray, int value);
+
+//////////////////// ByteArrayAppend ////////////////////
+//@requires: ObjectHandling.c::PyObjectCallMethod1
+
+static CYTHON_INLINE int __Pyx_PyByteArray_Append(PyObject* bytearray, int value) {
+    PyObject *pyval, *retval;
+#if CYTHON_COMPILING_IN_CPYTHON
+    if (likely(__Pyx_is_valid_index(value, 256))) {
+        Py_ssize_t n = Py_SIZE(bytearray);
+        if (likely(n != PY_SSIZE_T_MAX)) {
+            if (unlikely(PyByteArray_Resize(bytearray, n + 1) < 0))
+                return -1;
+            PyByteArray_AS_STRING(bytearray)[n] = value;
+            return 0;
+        }
+    } else {
+        PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");
+        return -1;
+    }
+#endif
+    pyval = PyInt_FromLong(value);
+    if (unlikely(!pyval))
+        return -1;
+    retval = __Pyx_PyObject_CallMethod1(bytearray, PYIDENT("append"), pyval);
+    Py_DECREF(pyval);
+    if (unlikely(!retval))
+        return -1;
+    Py_DECREF(retval);
+    return 0;
+}
+
+
+//////////////////// PyObjectFormat.proto ////////////////////
+
+#if CYTHON_USE_UNICODE_WRITER
+static PyObject* __Pyx_PyObject_Format(PyObject* s, PyObject* f);
+#else
+#define __Pyx_PyObject_Format(s, f) PyObject_Format(s, f)
+#endif
+
+//////////////////// PyObjectFormat ////////////////////
+
+#if CYTHON_USE_UNICODE_WRITER
+static PyObject* __Pyx_PyObject_Format(PyObject* obj, PyObject* format_spec) {
+    int ret;
+    _PyUnicodeWriter writer;
+
+    if (likely(PyFloat_CheckExact(obj))) {
+        // copied from CPython 3.5 "float__format__()" in floatobject.c
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x03040000
+        _PyUnicodeWriter_Init(&writer, 0);
+#else
+        _PyUnicodeWriter_Init(&writer);
+#endif
+        ret = _PyFloat_FormatAdvancedWriter(
+            &writer,
+            obj,
+            format_spec, 0, PyUnicode_GET_LENGTH(format_spec));
+    } else if (likely(PyLong_CheckExact(obj))) {
+        // copied from CPython 3.5 "long__format__()" in longobject.c
+#if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX < 0x03040000
+        _PyUnicodeWriter_Init(&writer, 0);
+#else
+        _PyUnicodeWriter_Init(&writer);
+#endif
+        ret = _PyLong_FormatAdvancedWriter(
+            &writer,
+            obj,
+            format_spec, 0, PyUnicode_GET_LENGTH(format_spec));
+    } else {
+        return PyObject_Format(obj, format_spec);
+    }
+
+    if (unlikely(ret == -1)) {
+        _PyUnicodeWriter_Dealloc(&writer);
+        return NULL;
+    }
+    return _PyUnicodeWriter_Finish(&writer);
+}
+#endif
+
+
+//////////////////// PyObjectFormatSimple.proto ////////////////////
+
+#if CYTHON_COMPILING_IN_PYPY
+    #define __Pyx_PyObject_FormatSimple(s, f) ( \
+        likely(PyUnicode_CheckExact(s)) ? (Py_INCREF(s), s) : \
+        PyObject_Format(s, f))
+#elif PY_MAJOR_VERSION < 3
+    // str is common in Py2, but formatting must return a Unicode string
+    #define __Pyx_PyObject_FormatSimple(s, f) ( \
+        likely(PyUnicode_CheckExact(s)) ? (Py_INCREF(s), s) : \
+        likely(PyString_CheckExact(s)) ? PyUnicode_FromEncodedObject(s, NULL, "strict") : \
+        PyObject_Format(s, f))
+#elif CYTHON_USE_TYPE_SLOTS
+    // Py3 nicely returns unicode strings from str() and repr(), which makes this quite efficient for builtin types.
+    // In Py3.8+, tp_str() delegates to tp_repr(), so we call tp_repr() directly here.
+    #define __Pyx_PyObject_FormatSimple(s, f) ( \
+        likely(PyUnicode_CheckExact(s)) ? (Py_INCREF(s), s) : \
+        likely(PyLong_CheckExact(s)) ? PyLong_Type.tp_repr(s) : \
+        likely(PyFloat_CheckExact(s)) ? PyFloat_Type.tp_repr(s) : \
+        PyObject_Format(s, f))
+#else
+    #define __Pyx_PyObject_FormatSimple(s, f) ( \
+        likely(PyUnicode_CheckExact(s)) ? (Py_INCREF(s), s) : \
+        PyObject_Format(s, f))
+#endif
+
+
+//////////////////// PyObjectFormatAndDecref.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_FormatSimpleAndDecref(PyObject* s, PyObject* f);
+static CYTHON_INLINE PyObject* __Pyx_PyObject_FormatAndDecref(PyObject* s, PyObject* f);
+
+//////////////////// PyObjectFormatAndDecref ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_FormatSimpleAndDecref(PyObject* s, PyObject* f) {
+    if (unlikely(!s)) return NULL;
+    if (likely(PyUnicode_CheckExact(s))) return s;
+    #if PY_MAJOR_VERSION < 3
+    // str is common in Py2, but formatting must return a Unicode string
+    if (likely(PyString_CheckExact(s))) {
+        PyObject *result = PyUnicode_FromEncodedObject(s, NULL, "strict");
+        Py_DECREF(s);
+        return result;
+    }
+    #endif
+    return __Pyx_PyObject_FormatAndDecref(s, f);
+}
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_FormatAndDecref(PyObject* s, PyObject* f) {
+    PyObject *result;
+    if (unlikely(!s)) return NULL;
+    result = PyObject_Format(s, f);
+    Py_DECREF(s);
+    return result;
+}
+
+
+//////////////////// PyUnicode_Unicode.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyUnicode_Unicode(PyObject *obj);/*proto*/
+
+//////////////////// PyUnicode_Unicode ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyUnicode_Unicode(PyObject *obj) {
+    if (unlikely(obj == Py_None))
+        obj = PYUNICODE("None");
+    return __Pyx_NewRef(obj);
+}
+
+
+//////////////////// PyObject_Unicode.proto ////////////////////
+
+#if PY_MAJOR_VERSION >= 3
+#define __Pyx_PyObject_Unicode(obj) \
+    (likely(PyUnicode_CheckExact(obj)) ? __Pyx_NewRef(obj) : PyObject_Str(obj))
+#else
+#define __Pyx_PyObject_Unicode(obj) \
+    (likely(PyUnicode_CheckExact(obj)) ? __Pyx_NewRef(obj) : PyObject_Unicode(obj))
+#endif
+
+
+//////////////////// PyStr_Str.proto ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyStr_Str(PyObject *obj);/*proto*/
+
+//////////////////// PyStr_Str ////////////////////
+
+static CYTHON_INLINE PyObject* __Pyx_PyStr_Str(PyObject *obj) {
+    if (unlikely(obj == Py_None))
+        obj = PYIDENT("None");
+    return __Pyx_NewRef(obj);
+}
+
+
+//////////////////// PyObject_Str.proto ////////////////////
+
+#define __Pyx_PyObject_Str(obj) \
+    (likely(PyString_CheckExact(obj)) ? __Pyx_NewRef(obj) : PyObject_Str(obj))
+
diff --git a/contrib/tools/cython_py2/Cython/Utility/TestCyUtilityLoader.pyx b/contrib/tools/cython_py2/Cython/Utility/TestCyUtilityLoader.pyx
new file mode 100644
index 00000000000..00e7a7681b8
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/TestCyUtilityLoader.pyx
@@ -0,0 +1,8 @@
+########## TestCyUtilityLoader ##########
+#@requires: OtherUtility
+
+test {{cy_loader}} impl
+
+
+########## OtherUtility ##########
+req {{cy_loader}} impl
diff --git a/contrib/tools/cython_py2/Cython/Utility/TestCythonScope.pyx b/contrib/tools/cython_py2/Cython/Utility/TestCythonScope.pyx
new file mode 100644
index 00000000000..7da7665c303
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/TestCythonScope.pyx
@@ -0,0 +1,70 @@
+########## TestClass ##########
+# These utilities are for testing purposes
+
+# The "cythonscope" test calls METH_O functions with their (self, arg) signature.
+# cython: always_allow_keywords=False
+
+from __future__ import print_function
+
+cdef extern from *:
+    cdef object __pyx_test_dep(object)
+
+@cname('__pyx_TestClass')
+cdef class TestClass(object):
+    cdef public int value
+
+    def __init__(self, int value):
+        self.value = value
+
+    def __str__(self):
+        return f'TestClass({self.value})'
+
+    cdef cdef_method(self, int value):
+        print('Hello from cdef_method', value)
+
+    cpdef cpdef_method(self, int value):
+        print('Hello from cpdef_method', value)
+
+    def def_method(self, int value):
+        print('Hello from def_method', value)
+
+    @cname('cdef_cname')
+    cdef cdef_cname_method(self, int value):
+        print("Hello from cdef_cname_method", value)
+
+    @cname('cpdef_cname')
+    cpdef cpdef_cname_method(self, int value):
+        print("Hello from cpdef_cname_method", value)
+
+    @cname('def_cname')
+    def def_cname_method(self, int value):
+        print("Hello from def_cname_method", value)
+
+@cname('__pyx_test_call_other_cy_util')
+cdef test_call(obj):
+    print('test_call')
+    __pyx_test_dep(obj)
+
+@cname('__pyx_TestClass_New')
+cdef _testclass_new(int value):
+    return TestClass(value)
+
+########### TestDep ##########
+
+from __future__ import print_function
+
+@cname('__pyx_test_dep')
+cdef test_dep(obj):
+    print('test_dep', obj)
+
+########## TestScope ##########
+
+@cname('__pyx_testscope')
+cdef object _testscope(int value):
+    return f"hello from cython scope, value={value}"
+
+########## View.TestScope ##########
+
+@cname('__pyx_view_testscope')
+cdef object _testscope(int value):
+    return f"hello from cython.view scope, value={value}"
diff --git a/contrib/tools/cython_py2/Cython/Utility/TestUtilityLoader.c b/contrib/tools/cython_py2/Cython/Utility/TestUtilityLoader.c
new file mode 100644
index 00000000000..595305f211b
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/TestUtilityLoader.c
@@ -0,0 +1,12 @@
+////////// TestUtilityLoader.proto //////////
+test {{loader}} prototype
+
+////////// TestUtilityLoader //////////
+//@requires: OtherUtility
+test {{loader}} impl
+
+////////// OtherUtility.proto //////////
+req {{loader}} proto
+
+////////// OtherUtility //////////
+req {{loader}} impl
diff --git a/contrib/tools/cython_py2/Cython/Utility/UFuncs_C.c b/contrib/tools/cython_py2/Cython/Utility/UFuncs_C.c
new file mode 100644
index 00000000000..2115e4b2b52
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/UFuncs_C.c
@@ -0,0 +1,42 @@
+///////////////////////// UFuncsInit.proto /////////////////////////
+//@proto_block: utility_code_proto_before_types
+
+#include <numpy/arrayobject.h>
+#include <numpy/ufuncobject.h>
+
+// account for change in type of arguments to PyUFuncGenericFunction in Numpy 1.19.x
+// Unfortunately we can only test against Numpy version 1.20.x since it wasn't marked
+// as an API break. Therefore, I'm "solving" the issue by casting function pointer types
+// on lower Numpy versions.
+#if NPY_API_VERSION >= 0x0000000e // Numpy 1.20.x
+#define __PYX_PYUFUNCGENERICFUNCTION_CAST(x) x
+#else
+#define __PYX_PYUFUNCGENERICFUNCTION_CAST(x) (PyUFuncGenericFunction)x
+#endif
+
+/////////////////////// UFuncConsts.proto ////////////////////
+
+// getter functions because we can't forward-declare arrays
+static PyUFuncGenericFunction* {{ufunc_funcs_name}}(void); /* proto */
+static char* {{ufunc_types_name}}(void); /* proto */
+static void* {{ufunc_data_name}}[] = {NULL};  /* always null */
+
+/////////////////////// UFuncConsts /////////////////////////
+
+static PyUFuncGenericFunction* {{ufunc_funcs_name}}(void) {
+    static PyUFuncGenericFunction arr[] = {
+        {{for loop, cname in looper(func_cnames)}}
+        __PYX_PYUFUNCGENERICFUNCTION_CAST(&{{cname}}){{if not loop.last}},{{endif}}
+        {{endfor}}
+    };
+    return arr;
+}
+
+static char* {{ufunc_types_name}}(void) {
+    static char arr[] = {
+        {{for loop, tp in looper(type_constants)}}
+        {{tp}}{{if not loop.last}},{{endif}}
+        {{endfor}}
+    };
+    return arr;
+}
diff --git a/contrib/tools/cython_py2/Cython/Utility/arrayarray.h b/contrib/tools/cython_py2/Cython/Utility/arrayarray.h
new file mode 100644
index 00000000000..a9e49237856
--- /dev/null
+++ b/contrib/tools/cython_py2/Cython/Utility/arrayarray.h
@@ -0,0 +1,149 @@
+/////////////// ArrayAPI.proto ///////////////
+
+// arrayarray.h
+//
+//    Artificial C-API for Python's <array.array> type,
+//    used by array.pxd
+//
+//    last changes: 2009-05-15 rk
+//                  2012-05-02 andreasvc
+//                  (see revision control)
+//
+
+#ifndef _ARRAYARRAY_H
+#define _ARRAYARRAY_H
+
+// These two forward declarations are explicitly handled in the type
+// declaration code, as including them here is too late for cython-defined
+// types to use them.
+// struct arrayobject;
+// typedef struct arrayobject arrayobject;
+
+// All possible arraydescr values are defined in the vector "descriptors"
+// below.  That's defined later because the appropriate get and set
+// functions aren't visible yet.
+typedef struct arraydescr {
+    int typecode;
+    int itemsize;
+    PyObject * (*getitem)(struct arrayobject *, Py_ssize_t);
+    int (*setitem)(struct arrayobject *, Py_ssize_t, PyObject *);
+#if PY_MAJOR_VERSION >= 3
+    char *formats;
+#endif
+} arraydescr;
+
+
+struct arrayobject {
+    PyObject_HEAD
+    Py_ssize_t ob_size;
+    union {
+        char *ob_item;
+        float *as_floats;
+        double *as_doubles;
+        int *as_ints;
+        unsigned int *as_uints;
+        unsigned char *as_uchars;
+        signed char *as_schars;
+        char *as_chars;
+        unsigned long *as_ulongs;
+        long *as_longs;
+#if PY_MAJOR_VERSION >= 3
+        unsigned long long *as_ulonglongs;
+        long long *as_longlongs;
+#endif
+        short *as_shorts;
+        unsigned short *as_ushorts;
+        Py_UNICODE *as_pyunicodes;
+        void *as_voidptr;
+    } data;
+    Py_ssize_t allocated;
+    struct arraydescr *ob_descr;
+    PyObject *weakreflist; /* List of weak references */
+#if PY_MAJOR_VERSION >= 3
+        int ob_exports;  /* Number of exported buffers */
+#endif
+};
+
+#ifndef NO_NEWARRAY_INLINE
+//  fast creation of a new array
+static CYTHON_INLINE PyObject * newarrayobject(PyTypeObject *type, Py_ssize_t size,
+    struct arraydescr *descr) {
+    arrayobject *op;
+    size_t nbytes;
+
+    if (size < 0) {
+        PyErr_BadInternalCall();
+        return NULL;
+    }
+
+    nbytes = size * descr->itemsize;
+    // Check for overflow
+    if (nbytes / descr->itemsize != (size_t)size) {
+        return PyErr_NoMemory();
+    }
+    op = (arrayobject *) type->tp_alloc(type, 0);
+    if (op == NULL) {
+        return NULL;
+    }
+    op->ob_descr = descr;
+    op->allocated = size;
+    op->weakreflist = NULL;
+    __Pyx_SET_SIZE(op, size);
+    if (size <= 0) {
+        op->data.ob_item = NULL;
+    }
+    else {
+        op->data.ob_item = PyMem_NEW(char, nbytes);
+        if (op->data.ob_item == NULL) {
+            Py_DECREF(op);
+            return PyErr_NoMemory();
+        }
+    }
+    return (PyObject *) op;
+}
+#else
+PyObject* newarrayobject(PyTypeObject *type, Py_ssize_t size,
+    struct arraydescr *descr);
+#endif /* ifndef NO_NEWARRAY_INLINE */
+
+// fast resize (reallocation to the point)
+// not designed for filing small increments (but for fast opaque array apps)
+static CYTHON_INLINE int resize(arrayobject *self, Py_ssize_t n) {
+    void *items = (void*) self->data.ob_item;
+    PyMem_Resize(items, char, (size_t)(n * self->ob_descr->itemsize));
+    if (items == NULL) {
+        PyErr_NoMemory();
+        return -1;
+    }
+    self->data.ob_item = (char*) items;
+    __Pyx_SET_SIZE(self, n);
+    self->allocated = n;
+    return 0;
+}
+
+// suitable for small increments; over allocation 50% ;
+static CYTHON_INLINE int resize_smart(arrayobject *self, Py_ssize_t n) {
+    void *items = (void*) self->data.ob_item;
+    Py_ssize_t newsize;
+    if (n < self->allocated && n*4 > self->allocated) {
+        __Pyx_SET_SIZE(self, n);
+        return 0;
+    }
+    newsize = n + (n / 2) + 1;
+    if (newsize <= n) {   /* overflow */
+        PyErr_NoMemory();
+        return -1;
+    }
+    PyMem_Resize(items, char, (size_t)(newsize * self->ob_descr->itemsize));
+    if (items == NULL) {
+        PyErr_NoMemory();
+        return -1;
+    }
+    self->data.ob_item = (char*) items;
+    __Pyx_SET_SIZE(self, n);
+    self->allocated = newsize;
+    return 0;
+}
+
+#endif
+/* _ARRAYARRAY_H */
diff --git a/contrib/tools/cython_py2/cython.py b/contrib/tools/cython_py2/cython.py
new file mode 100755
index 00000000000..951184229b0
--- /dev/null
+++ b/contrib/tools/cython_py2/cython.py
@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+
+# Change content of this file to change uids for cython programs - cython 3.0.12 r0
+
+#
+#   Cython -- Main Program, generic
+#
+
+if __name__ == '__main__':
+
+    import os
+    import sys
+    sys.dont_write_bytecode = True
+
+    # Make sure we import the right Cython
+    cythonpath, _ = os.path.split(os.path.realpath(__file__))
+    sys.path.insert(0, cythonpath)
+
+    from Cython.Compiler.Main import main
+    main(command_line = 1)
+
+else:
+    # Void cython.* directives.
+    from Cython.Shadow import *
+    ## and bring in the __version__
+    from Cython import __version__
+    from Cython import load_ipython_extension
diff --git a/contrib/tools/cython_py2/generated_c_headers.h b/contrib/tools/cython_py2/generated_c_headers.h
new file mode 100644
index 00000000000..7b9637ef9c2
--- /dev/null
+++ b/contrib/tools/cython_py2/generated_c_headers.h
@@ -0,0 +1 @@
+#pragma once
+\ No newline at end of file
diff --git a/contrib/tools/cython_py2/generated_cpp_headers.h b/contrib/tools/cython_py2/generated_cpp_headers.h
new file mode 100644
index 00000000000..645dbac0dea
--- /dev/null
+++ b/contrib/tools/cython_py2/generated_cpp_headers.h
@@ -0,0 +1,8 @@
+#pragma once
+
+// Content must be in sync with https://a.yandex-team.ru/arc/trunk/arcadia/contrib/tools/cython/Cython/Compiler/Nodes.py?rev=r8428765#L717-720
+// or other placess of cython compiler adding C++ specific headers implicitelly.
+#include "ios"
+#include "new"
+#include "stdexcept"
+#include "typeinfo"
author	mikhnenko <[email protected]>	2026-01-13 09:51:48 +0300
committer	mikhnenko <[email protected]>	2026-01-13 10:20:05 +0300
commit	05c0c8a128582bb1391c8e78f3e9269b9876e079 (patch)
tree	43d19cde15d5035bf689baa0a468bfba418dc372
parent	7d5b002a117264dd78b242cc37673ec656379d4c (diff)