Intermediate changes

25 files changed, 268 insertions, 407 deletions

diff --git a/build/conf/settings.conf b/build/conf/settings.conf
index b98b1a5e9f..324886f4d0 100644
--- a/build/conf/settings.conf
+++ b/build/conf/settings.conf
@@ -15,7 +15,7 @@ ENABLE_RERESOLVE_FOR_GENERATED_FILES=yes
 REPORT_ALL_DUPSRC=yes
 DEPS_CACHE_CONTROL_UIDS_CACHE=yes
 INCLUDE_BLACKLIST_TO_CONF_HASH=no
-INCLUDE_ISOLATED_PROJECTS_TO_CONF_HASH=no
+INCLUDE_ISOLATED_PROJECTS_TO_CONF_HASH=yes
 USE_GRAND_BYPASS=no
 USE_GLOBAL_CMD=yes
 YMAKE_USE_NEW_UIDS=yes
@@ -129,3 +129,4 @@ _FOLDABLE_VARS=\
 
 ARCADIA_TEST_ROOT=../arcadia_tests_data/
 DEFAULT_REQUIREMENTS=network:restricted cpu:1 ram:32
+
diff --git a/build/plugins/nots.py b/build/plugins/nots.py
index 329b1c111d..3d67381aa3 100644
--- a/build/plugins/nots.py
+++ b/build/plugins/nots.py
@@ -234,6 +234,15 @@ def on_set_package_manager(unit):
             pm_type = pm_key
             break
 
+    if pm_type == 'npm' and "devtools/dummy_arcadia/typescript/npm" not in source_path:
+        ymake.report_configure_error(
+            "\n"
+            "Project is configured to use npm as a package manager. \n"
+            "Only pnpm is supported at the moment.\n"
+            "Please follow the instruction to migrate your project:\n"
+            "https://docs.yandex-team.ru/frontend-in-arcadia/tutorials/migrate#migrate-to-pnpm"
+        )
+
     unit.on_peerdir_ts_resource(pm_type)
     unit.set(["PM_TYPE", pm_type])
     unit.set(["PM_SCRIPT", f"${pm_type.upper()}_SCRIPT"])
diff --git a/build/ymake.core.conf b/build/ymake.core.conf
index 5be564a2c4..ba127143c9 100644
--- a/build/ymake.core.conf
+++ b/build/ymake.core.conf
@@ -20,7 +20,7 @@ FBS_FAKEID=2024-03-13
 
 # Change of this value will invalidate some parts of configure cache
 # but will not affect builds anyhow (except tests referring build/ directory)
-JSON_CACHE_FAKE_ID=20240414
+JSON_CACHE_FAKE_ID=20240830
 
 STRUCT_CMD=yes
 
diff --git a/contrib/python/PyYAML/py2/ya.make b/contrib/python/PyYAML/py2/ya.make
index c3a6e3b175..e4217f6385 100644
--- a/contrib/python/PyYAML/py2/ya.make
+++ b/contrib/python/PyYAML/py2/ya.make
@@ -1,9 +1,11 @@
-PY2_LIBRARY()
+# Generated by devtools/yamaker (pypi).
 
-LICENSE(MIT)
+PY2_LIBRARY()
 
 VERSION(5.4.1)
 
+LICENSE(MIT)
+
 PEERDIR(
     contrib/libs/yaml
 )
@@ -13,6 +15,10 @@ ADDINCL(
     FOR cython contrib/python/PyYAML/py2
 )
 
+NO_COMPILER_WARNINGS()
+
+NO_LINT()
+
 PY_SRCS(
     TOP_LEVEL
     _yaml/__init__.py
@@ -38,13 +44,9 @@ PY_SRCS(
 )
 
 RESOURCE_FILES(
-    PREFIX contrib/python/PyYAML/
+    PREFIX contrib/python/PyYAML/py2/
     .dist-info/METADATA
     .dist-info/top_level.txt
 )
 
-NO_LINT()
-
-NO_COMPILER_WARNINGS()
-
 END()
diff --git a/contrib/python/PyYAML/py3/.dist-info/METADATA b/contrib/python/PyYAML/py3/.dist-info/METADATA
index 565f05b737..db029b770c 100644
--- a/contrib/python/PyYAML/py3/.dist-info/METADATA
+++ b/contrib/python/PyYAML/py3/.dist-info/METADATA
@@ -1,12 +1,12 @@
 Metadata-Version: 2.1
 Name: PyYAML
-Version: 5.4.1
+Version: 6.0.2
 Summary: YAML parser and emitter for Python
 Home-page: https://pyyaml.org/
+Download-URL: https://pypi.org/project/PyYAML/
 Author: Kirill Simonov
 Author-email: xi@resolvent.net
 License: MIT
-Download-URL: https://pypi.org/project/PyYAML/
 Project-URL: Bug Tracker, https://github.com/yaml/pyyaml/issues
 Project-URL: CI, https://github.com/yaml/pyyaml/actions
 Project-URL: Documentation, https://pyyaml.org/wiki/PyYAMLDocumentation
@@ -19,18 +19,19 @@ Classifier: License :: OSI Approved :: MIT License
 Classifier: Operating System :: OS Independent
 Classifier: Programming Language :: Cython
 Classifier: Programming Language :: Python
-Classifier: Programming Language :: Python :: 2
-Classifier: Programming Language :: Python :: 2.7
 Classifier: Programming Language :: Python :: 3
-Classifier: Programming Language :: Python :: 3.6
-Classifier: Programming Language :: Python :: 3.7
 Classifier: Programming Language :: Python :: 3.8
 Classifier: Programming Language :: Python :: 3.9
+Classifier: Programming Language :: Python :: 3.10
+Classifier: Programming Language :: Python :: 3.11
+Classifier: Programming Language :: Python :: 3.12
+Classifier: Programming Language :: Python :: 3.13
 Classifier: Programming Language :: Python :: Implementation :: CPython
 Classifier: Programming Language :: Python :: Implementation :: PyPy
 Classifier: Topic :: Software Development :: Libraries :: Python Modules
 Classifier: Topic :: Text Processing :: Markup
-Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*
+Requires-Python: >=3.8
+License-File: LICENSE
 
 YAML is a data serialization format designed for human readability
 and interaction with scripting languages.  PyYAML is a YAML parser
@@ -43,4 +44,3 @@ allow to represent an arbitrary Python object.
 
 PyYAML is applicable for a broad range of tasks from complex
 configuration files to object serialization and persistence.
-
diff --git a/contrib/python/PyYAML/py3/README b/contrib/python/PyYAML/py3/README
deleted file mode 100644
index 49c87e7642..0000000000
--- a/contrib/python/PyYAML/py3/README
+++ /dev/null
@@ -1,43 +0,0 @@
-PyYAML - The next generation YAML parser and emitter for Python.
-
-To install, type 'python setup.py install'.
-
-By default, the setup.py script checks whether LibYAML is installed
-and if so, builds and installs LibYAML bindings.  To skip the check
-and force installation of LibYAML bindings, use the option '--with-libyaml':
-'python setup.py --with-libyaml install'.  To disable the check and
-skip building and installing LibYAML bindings, use '--without-libyaml':
-'python setup.py --without-libyaml install'.
-
-When LibYAML bindings are installed, you may use fast LibYAML-based
-parser and emitter as follows:
-
-    >>> yaml.load(stream, Loader=yaml.CLoader)
-    >>> yaml.dump(data, Dumper=yaml.CDumper)
-
-If you don't trust the input stream, you should use:
-
-    >>> yaml.safe_load(stream)
-
-PyYAML includes a comprehensive test suite.  To run the tests,
-type 'python setup.py test'.
-
-For more information, check the PyYAML homepage:
-'https://github.com/yaml/pyyaml'.
-
-For PyYAML tutorial and reference, see:
-'http://pyyaml.org/wiki/PyYAMLDocumentation'.
-
-Discuss PyYAML with the maintainers in IRC #pyyaml irc.freenode.net.
-
-You may also use the YAML-Core mailing list:
-'http://lists.sourceforge.net/lists/listinfo/yaml-core'.
-
-Submit bug reports and feature requests to the PyYAML bug tracker:
-'https://github.com/yaml/pyyaml/issues'.
-
-The PyYAML module was written by Kirill Simonov <xi@resolvent.net>.
-It is currently maintained by the YAML and Python communities.
-
-PyYAML is released under the MIT license.
-See the file LICENSE for more details.
diff --git a/contrib/python/PyYAML/py3/README.md b/contrib/python/PyYAML/py3/README.md
new file mode 100644
index 0000000000..7d01da248f
--- /dev/null
+++ b/contrib/python/PyYAML/py3/README.md
@@ -0,0 +1,53 @@
+PyYAML
+======
+
+A full-featured YAML processing framework for Python
+
+## Installation
+
+To install, type `python setup.py install`.
+
+By default, the `setup.py` script checks whether LibYAML is installed and if
+so, builds and installs LibYAML bindings.
+To skip the check and force installation of LibYAML bindings, use the option
+`--with-libyaml`: `python setup.py --with-libyaml install`.
+To disable the check and skip building and installing LibYAML bindings, use
+`--without-libyaml`: `python setup.py --without-libyaml install`.
+
+When LibYAML bindings are installed, you may use fast LibYAML-based parser and
+emitter as follows:
+
+    >>> yaml.load(stream, Loader=yaml.CLoader)
+    >>> yaml.dump(data, Dumper=yaml.CDumper)
+
+If you don't trust the input YAML stream, you should use:
+
+    >>> yaml.safe_load(stream)
+
+## Testing
+
+PyYAML includes a comprehensive test suite.
+To run the tests, type `python setup.py test`.
+
+## Further Information
+
+* For more information, check the
+  [PyYAML homepage](https://github.com/yaml/pyyaml).
+
+* [PyYAML tutorial and reference](http://pyyaml.org/wiki/PyYAMLDocumentation).
+
+* Discuss PyYAML with the maintainers on
+  Matrix at https://matrix.to/#/#pyyaml:yaml.io or
+  IRC #pyyaml irc.libera.chat
+
+* Submit bug reports and feature requests to the
+  [PyYAML bug tracker](https://github.com/yaml/pyyaml/issues).
+
+## License
+
+The PyYAML module was written by Kirill Simonov <xi@resolvent.net>.
+It is currently maintained by the YAML and Python communities.
+
+PyYAML is released under the MIT license.
+
+See the file LICENSE for more details.
diff --git a/contrib/python/PyYAML/py3/ya.make b/contrib/python/PyYAML/py3/ya.make
index 7f481c9b7a..65339b34e4 100644
--- a/contrib/python/PyYAML/py3/ya.make
+++ b/contrib/python/PyYAML/py3/ya.make
@@ -1,8 +1,10 @@
+# Generated by devtools/yamaker (pypi).
+
 PY3_LIBRARY()
 
-LICENSE(MIT)
+VERSION(6.0.2)
 
-VERSION(5.4.1)
+LICENSE(MIT)
 
 PEERDIR(
     contrib/libs/yaml
@@ -13,6 +15,10 @@ ADDINCL(
     FOR cython contrib/python/PyYAML/py3
 )
 
+NO_COMPILER_WARNINGS()
+
+NO_LINT()
+
 PY_SRCS(
     TOP_LEVEL
     _yaml/__init__.py
@@ -38,13 +44,9 @@ PY_SRCS(
 )
 
 RESOURCE_FILES(
-    PREFIX contrib/python/PyYAML/
+    PREFIX contrib/python/PyYAML/py3/
     .dist-info/METADATA
     .dist-info/top_level.txt
 )
 
-NO_LINT()
-
-NO_COMPILER_WARNINGS()
-
 END()
diff --git a/contrib/python/PyYAML/py3/yaml/__init__.py b/contrib/python/PyYAML/py3/yaml/__init__.py
index 86d07b5525..2ec4f203c7 100644
--- a/contrib/python/PyYAML/py3/yaml/__init__.py
+++ b/contrib/python/PyYAML/py3/yaml/__init__.py
@@ -8,7 +8,7 @@ from .nodes import *
 from .loader import *
 from .dumper import *
 
-__version__ = '5.4.1'
+__version__ = '6.0.2'
 try:
     from .cyaml import *
     __with_libyaml__ = True
@@ -18,41 +18,12 @@ except ImportError:
 import io
 
 #------------------------------------------------------------------------------
-# Warnings control
+# XXX "Warnings control" is now deprecated. Leaving in the API function to not
+# break code that uses it.
 #------------------------------------------------------------------------------
-
-# 'Global' warnings state:
-_warnings_enabled = {
-    'YAMLLoadWarning': True,
-}
-
-# Get or set global warnings' state
 def warnings(settings=None):
     if settings is None:
-        return _warnings_enabled
-
-    if type(settings) is dict:
-        for key in settings:
-            if key in _warnings_enabled:
-                _warnings_enabled[key] = settings[key]
-
-# Warn when load() is called without Loader=...
-class YAMLLoadWarning(RuntimeWarning):
-    pass
-
-def load_warning(method):
-    if _warnings_enabled['YAMLLoadWarning'] is False:
-        return
-
-    import warnings
-
-    message = (
-        "calling yaml.%s() without Loader=... is deprecated, as the "
-        "default Loader is unsafe. Please read "
-        "https://msg.pyyaml.org/load for full details."
-    ) % method
-
-    warnings.warn(message, YAMLLoadWarning, stacklevel=3)
+        return {}
 
 #------------------------------------------------------------------------------
 def scan(stream, Loader=Loader):
@@ -100,30 +71,22 @@ def compose_all(stream, Loader=Loader):
     finally:
         loader.dispose()
 
-def load(stream, Loader=None):
+def load(stream, Loader):
     """
     Parse the first YAML document in a stream
     and produce the corresponding Python object.
     """
-    if Loader is None:
-        load_warning('load')
-        Loader = FullLoader
-
     loader = Loader(stream)
     try:
         return loader.get_single_data()
     finally:
         loader.dispose()
 
-def load_all(stream, Loader=None):
+def load_all(stream, Loader):
     """
     Parse all YAML documents in a stream
     and produce corresponding Python objects.
     """
-    if Loader is None:
-        load_warning('load_all')
-        Loader = FullLoader
-
     loader = Loader(stream)
     try:
         while loader.check_data():
diff --git a/contrib/python/PyYAML/py3/yaml/_yaml.h b/contrib/python/PyYAML/py3/yaml/_yaml.h
index 21fd6a991b..e3984c4da3 100644
--- a/contrib/python/PyYAML/py3/yaml/_yaml.h
+++ b/contrib/python/PyYAML/py3/yaml/_yaml.h
@@ -1,18 +1,8 @@
 
 #include <yaml.h>
 
-#if PY_MAJOR_VERSION < 3
-
-#define PyUnicode_FromString(s) PyUnicode_DecodeUTF8((s), strlen(s), "strict")
-
-#else
-
-#define PyString_CheckExact PyBytes_CheckExact
-#define PyString_AS_STRING  PyBytes_AS_STRING
-#define PyString_GET_SIZE   PyBytes_GET_SIZE
-#define PyString_FromStringAndSize  PyBytes_FromStringAndSize
-
-#endif
+#define PyUnicode_FromYamlString(s) PyUnicode_FromString((const char *)(void *)(s))
+#define PyBytes_AS_Yaml_STRING(s) ((yaml_char_t *)PyBytes_AS_STRING(s))
 
 #ifdef _MSC_VER	/* MS Visual C++ 6.0 */
 #if _MSC_VER == 1200
diff --git a/contrib/python/PyYAML/py3/yaml/_yaml.pxd b/contrib/python/PyYAML/py3/yaml/_yaml.pxd
index 7937c9db51..713244d80b 100644
--- a/contrib/python/PyYAML/py3/yaml/_yaml.pxd
+++ b/contrib/python/PyYAML/py3/yaml/_yaml.pxd
@@ -2,18 +2,25 @@
 cdef extern from "_yaml.h":
 
     void malloc(int l)
-    void memcpy(char *d, char *s, int l)
+    void memcpy(void *d, void *s, int l)
     int strlen(char *s)
     int PyString_CheckExact(object o)
     int PyUnicode_CheckExact(object o)
     char *PyString_AS_STRING(object o)
-    int PyString_GET_SIZE(object o)
-    object PyString_FromStringAndSize(char *v, int l)
     object PyUnicode_FromString(char *u)
     object PyUnicode_DecodeUTF8(char *u, int s, char *e)
     object PyUnicode_AsUTF8String(object o)
     int PY_MAJOR_VERSION
 
+    ctypedef unsigned char yaml_char_t
+
+    object PyUnicode_FromYamlString(void *u)
+    yaml_char_t *PyBytes_AS_Yaml_STRING(object o)
+    const char *PyBytes_AS_STRING(object o)
+    int PyBytes_CheckExact(object o)
+    int PyBytes_GET_SIZE(object o)
+    object PyBytes_FromStringAndSize(char *v, int l)
+
     ctypedef enum:
         SIZEOF_VOID_P
     ctypedef enum yaml_encoding_t:
@@ -85,10 +92,10 @@ cdef extern from "_yaml.h":
         YAML_MAPPING_START_EVENT
         YAML_MAPPING_END_EVENT
 
-    ctypedef int yaml_read_handler_t(void *data, char *buffer,
+    ctypedef int yaml_read_handler_t(void *data, unsigned char *buffer,
             size_t size, size_t *size_read) except 0
 
-    ctypedef int yaml_write_handler_t(void *data, char *buffer,
+    ctypedef int yaml_write_handler_t(void *data, unsigned char *buffer,
             size_t size) except 0
 
     ctypedef struct yaml_mark_t:
@@ -99,8 +106,8 @@ cdef extern from "_yaml.h":
         int major
         int minor
     ctypedef struct yaml_tag_directive_t:
-        char *handle
-        char *prefix
+        yaml_char_t *handle
+        yaml_char_t *prefix
 
     ctypedef struct _yaml_token_stream_start_data_t:
         yaml_encoding_t encoding
@@ -208,23 +215,23 @@ cdef extern from "_yaml.h":
             int implicit)
     int yaml_document_end_event_initialize(yaml_event_t *event,
             int implicit)
-    int yaml_alias_event_initialize(yaml_event_t *event, char *anchor)
+    int yaml_alias_event_initialize(yaml_event_t *event, yaml_char_t *anchor)
     int yaml_scalar_event_initialize(yaml_event_t *event,
-            char *anchor, char *tag, char *value, size_t length,
+            yaml_char_t *anchor, yaml_char_t *tag, yaml_char_t *value, int length,
             int plain_implicit, int quoted_implicit,
             yaml_scalar_style_t style)
     int yaml_sequence_start_event_initialize(yaml_event_t *event,
-            char *anchor, char *tag, int implicit, yaml_sequence_style_t style)
+            yaml_char_t *anchor, yaml_char_t *tag, int implicit, yaml_sequence_style_t style)
     int yaml_sequence_end_event_initialize(yaml_event_t *event)
     int yaml_mapping_start_event_initialize(yaml_event_t *event,
-            char *anchor, char *tag, int implicit, yaml_mapping_style_t style)
+            yaml_char_t *anchor, yaml_char_t *tag, int implicit, yaml_mapping_style_t style)
     int yaml_mapping_end_event_initialize(yaml_event_t *event)
     void yaml_event_delete(yaml_event_t *event)
 
     int yaml_parser_initialize(yaml_parser_t *parser)
     void yaml_parser_delete(yaml_parser_t *parser)
     void yaml_parser_set_input_string(yaml_parser_t *parser,
-            char *input, size_t size)
+            const unsigned char *input, size_t size)
     void yaml_parser_set_input(yaml_parser_t *parser,
             yaml_read_handler_t *handler, void *data)
     void yaml_parser_set_encoding(yaml_parser_t *parser,
diff --git a/contrib/python/PyYAML/py3/yaml/_yaml.pyx b/contrib/python/PyYAML/py3/yaml/_yaml.pyx
index ff4efe80b5..e3e93e2cef 100644
--- a/contrib/python/PyYAML/py3/yaml/_yaml.pyx
+++ b/contrib/python/PyYAML/py3/yaml/_yaml.pyx
@@ -2,12 +2,9 @@
 import yaml
 
 def get_version_string():
-    cdef char *value
+    cdef const char *value
     value = yaml_get_version_string()
-    if PY_MAJOR_VERSION < 3:
-        return value
-    else:
-        return PyUnicode_FromString(value)
+    return PyUnicode_FromString(value)
 
 def get_version():
     cdef int major, minor, patch
@@ -275,10 +272,7 @@ cdef class CParser:
             try:
                 self.stream_name = stream.name
             except AttributeError:
-                if PY_MAJOR_VERSION < 3:
-                    self.stream_name = '<file>'
-                else:
-                    self.stream_name = u'<file>'
+                self.stream_name = u'<file>'
             self.stream_cache = None
             self.stream_cache_len = 0
             self.stream_cache_pos = 0
@@ -286,23 +280,14 @@ cdef class CParser:
         else:
             if PyUnicode_CheckExact(stream) != 0:
                 stream = PyUnicode_AsUTF8String(stream)
-                if PY_MAJOR_VERSION < 3:
-                    self.stream_name = '<unicode string>'
-                else:
-                    self.stream_name = u'<unicode string>'
+                self.stream_name = u'<unicode string>'
                 self.unicode_source = 1
             else:
-                if PY_MAJOR_VERSION < 3:
-                    self.stream_name = '<byte string>'
-                else:
-                    self.stream_name = u'<byte string>'
-            if PyString_CheckExact(stream) == 0:
-                if PY_MAJOR_VERSION < 3:
-                    raise TypeError("a string or stream input is required")
-                else:
-                    raise TypeError(u"a string or stream input is required")
+                self.stream_name = u'<byte string>'
+            if PyBytes_CheckExact(stream) == 0:
+                raise TypeError(u"a string or stream input is required")
             self.stream = stream
-            yaml_parser_set_input_string(&self.parser, PyString_AS_STRING(stream), PyString_GET_SIZE(stream))
+            yaml_parser_set_input_string(&self.parser, PyBytes_AS_Yaml_STRING(stream), PyBytes_GET_SIZE(stream))
         self.current_token = None
         self.current_event = None
         self.anchors = {}
@@ -318,12 +303,8 @@ cdef class CParser:
         if self.parser.error == YAML_MEMORY_ERROR:
             return MemoryError
         elif self.parser.error == YAML_READER_ERROR:
-            if PY_MAJOR_VERSION < 3:
-                return ReaderError(self.stream_name, self.parser.problem_offset,
-                        self.parser.problem_value, '?', self.parser.problem)
-            else:
-                return ReaderError(self.stream_name, self.parser.problem_offset,
-                        self.parser.problem_value, u'?', PyUnicode_FromString(self.parser.problem))
+            return ReaderError(self.stream_name, self.parser.problem_offset,
+                    self.parser.problem_value, u'?', PyUnicode_FromString(self.parser.problem))
         elif self.parser.error == YAML_SCANNER_ERROR    \
                 or self.parser.error == YAML_PARSER_ERROR:
             context_mark = None
@@ -340,22 +321,13 @@ cdef class CParser:
                         self.parser.problem_mark.column, None, None)
             context = None
             if self.parser.context != NULL:
-                if PY_MAJOR_VERSION < 3:
-                    context = self.parser.context
-                else:
-                    context = PyUnicode_FromString(self.parser.context)
-            if PY_MAJOR_VERSION < 3:
-                problem = self.parser.problem
-            else:
-                problem = PyUnicode_FromString(self.parser.problem)
+                context = PyUnicode_FromString(self.parser.context)
+            problem = PyUnicode_FromString(self.parser.problem)
             if self.parser.error == YAML_SCANNER_ERROR:
                 return ScannerError(context, context_mark, problem, problem_mark)
             else:
                 return ParserError(context, context_mark, problem, problem_mark)
-        if PY_MAJOR_VERSION < 3:
-            raise ValueError("no parser error")
-        else:
-            raise ValueError(u"no parser error")
+        raise ValueError(u"no parser error")
 
     def raw_scan(self):
         cdef yaml_token_t token
@@ -414,8 +386,8 @@ cdef class CParser:
                         token.data.version_directive.minor),
                     start_mark, end_mark)
         elif token.type == YAML_TAG_DIRECTIVE_TOKEN:
-            handle = PyUnicode_FromString(token.data.tag_directive.handle)
-            prefix = PyUnicode_FromString(token.data.tag_directive.prefix)
+            handle = PyUnicode_FromYamlString(token.data.tag_directive.handle)
+            prefix = PyUnicode_FromYamlString(token.data.tag_directive.prefix)
             return DirectiveToken(u"TAG", (handle, prefix),
                     start_mark, end_mark)
         elif token.type == YAML_DOCUMENT_START_TOKEN:
@@ -445,19 +417,19 @@ cdef class CParser:
         elif token.type == YAML_VALUE_TOKEN:
             return ValueToken(start_mark, end_mark)
         elif token.type == YAML_ALIAS_TOKEN:
-            value = PyUnicode_FromString(token.data.alias.value)
+            value = PyUnicode_FromYamlString(token.data.alias.value)
             return AliasToken(value, start_mark, end_mark)
         elif token.type == YAML_ANCHOR_TOKEN:
-            value = PyUnicode_FromString(token.data.anchor.value)
+            value = PyUnicode_FromYamlString(token.data.anchor.value)
             return AnchorToken(value, start_mark, end_mark)
         elif token.type == YAML_TAG_TOKEN:
-            handle = PyUnicode_FromString(token.data.tag.handle)
-            suffix = PyUnicode_FromString(token.data.tag.suffix)
+            handle = PyUnicode_FromYamlString(token.data.tag.handle)
+            suffix = PyUnicode_FromYamlString(token.data.tag.suffix)
             if not handle:
                 handle = None
             return TagToken((handle, suffix), start_mark, end_mark)
         elif token.type == YAML_SCALAR_TOKEN:
-            value = PyUnicode_DecodeUTF8(token.data.scalar.value,
+            value = PyUnicode_DecodeUTF8(<char *>token.data.scalar.value,
                     token.data.scalar.length, 'strict')
             plain = False
             style = None
@@ -475,10 +447,7 @@ cdef class CParser:
             return ScalarToken(value, plain,
                     start_mark, end_mark, style)
         else:
-            if PY_MAJOR_VERSION < 3:
-                raise ValueError("unknown token type")
-            else:
-                raise ValueError(u"unknown token type")
+            raise ValueError(u"unknown token type")
 
     def get_token(self):
         if self.current_token is not None:
@@ -571,8 +540,8 @@ cdef class CParser:
                 tags = {}
                 tag_directive = event.data.document_start.tag_directives.start
                 while tag_directive != event.data.document_start.tag_directives.end:
-                    handle = PyUnicode_FromString(tag_directive.handle)
-                    prefix = PyUnicode_FromString(tag_directive.prefix)
+                    handle = PyUnicode_FromYamlString(tag_directive.handle)
+                    prefix = PyUnicode_FromYamlString(tag_directive.prefix)
                     tags[handle] = prefix
                     tag_directive = tag_directive+1
             return DocumentStartEvent(start_mark, end_mark,
@@ -583,16 +552,16 @@ cdef class CParser:
                 explicit = True
             return DocumentEndEvent(start_mark, end_mark, explicit)
         elif event.type == YAML_ALIAS_EVENT:
-            anchor = PyUnicode_FromString(event.data.alias.anchor)
+            anchor = PyUnicode_FromYamlString(event.data.alias.anchor)
             return AliasEvent(anchor, start_mark, end_mark)
         elif event.type == YAML_SCALAR_EVENT:
             anchor = None
             if event.data.scalar.anchor != NULL:
-                anchor = PyUnicode_FromString(event.data.scalar.anchor)
+                anchor = PyUnicode_FromYamlString(event.data.scalar.anchor)
             tag = None
             if event.data.scalar.tag != NULL:
-                tag = PyUnicode_FromString(event.data.scalar.tag)
-            value = PyUnicode_DecodeUTF8(event.data.scalar.value,
+                tag = PyUnicode_FromYamlString(event.data.scalar.tag)
+            value = PyUnicode_DecodeUTF8(<char *>event.data.scalar.value,
                     event.data.scalar.length, 'strict')
             plain_implicit = False
             if event.data.scalar.plain_implicit == 1:
@@ -617,10 +586,10 @@ cdef class CParser:
         elif event.type == YAML_SEQUENCE_START_EVENT:
             anchor = None
             if event.data.sequence_start.anchor != NULL:
-                anchor = PyUnicode_FromString(event.data.sequence_start.anchor)
+                anchor = PyUnicode_FromYamlString(event.data.sequence_start.anchor)
             tag = None
             if event.data.sequence_start.tag != NULL:
-                tag = PyUnicode_FromString(event.data.sequence_start.tag)
+                tag = PyUnicode_FromYamlString(event.data.sequence_start.tag)
             implicit = False
             if event.data.sequence_start.implicit == 1:
                 implicit = True
@@ -634,10 +603,10 @@ cdef class CParser:
         elif event.type == YAML_MAPPING_START_EVENT:
             anchor = None
             if event.data.mapping_start.anchor != NULL:
-                anchor = PyUnicode_FromString(event.data.mapping_start.anchor)
+                anchor = PyUnicode_FromYamlString(event.data.mapping_start.anchor)
             tag = None
             if event.data.mapping_start.tag != NULL:
-                tag = PyUnicode_FromString(event.data.mapping_start.tag)
+                tag = PyUnicode_FromYamlString(event.data.mapping_start.tag)
             implicit = False
             if event.data.mapping_start.implicit == 1:
                 implicit = True
@@ -653,10 +622,7 @@ cdef class CParser:
         elif event.type == YAML_MAPPING_END_EVENT:
             return MappingEndEvent(start_mark, end_mark)
         else:
-            if PY_MAJOR_VERSION < 3:
-                raise ValueError("unknown event type")
-            else:
-                raise ValueError(u"unknown event type")
+            raise ValueError(u"unknown event type")
 
     def get_event(self):
         if self.current_event is not None:
@@ -712,12 +678,8 @@ cdef class CParser:
                     self.parsed_event.start_mark.line,
                     self.parsed_event.start_mark.column,
                     None, None)
-            if PY_MAJOR_VERSION < 3:
-                raise ComposerError("expected a single document in the stream",
-                        document.start_mark, "but found another document", mark)
-            else:
-                raise ComposerError(u"expected a single document in the stream",
-                        document.start_mark, u"but found another document", mark)
+            raise ComposerError(u"expected a single document in the stream",
+                    document.start_mark, u"but found another document", mark)
         return document
 
     cdef object _compose_document(self):
@@ -731,29 +693,26 @@ cdef class CParser:
     cdef object _compose_node(self, object parent, object index):
         self._parse_next_event()
         if self.parsed_event.type == YAML_ALIAS_EVENT:
-            anchor = PyUnicode_FromString(self.parsed_event.data.alias.anchor)
+            anchor = PyUnicode_FromYamlString(self.parsed_event.data.alias.anchor)
             if anchor not in self.anchors:
                 mark = Mark(self.stream_name,
                         self.parsed_event.start_mark.index,
                         self.parsed_event.start_mark.line,
                         self.parsed_event.start_mark.column,
                         None, None)
-                if PY_MAJOR_VERSION < 3:
-                    raise ComposerError(None, None, "found undefined alias", mark)
-                else:
-                    raise ComposerError(None, None, u"found undefined alias", mark)
+                raise ComposerError(None, None, u"found undefined alias", mark)
             yaml_event_delete(&self.parsed_event)
             return self.anchors[anchor]
         anchor = None
         if self.parsed_event.type == YAML_SCALAR_EVENT  \
                 and self.parsed_event.data.scalar.anchor != NULL:
-            anchor = PyUnicode_FromString(self.parsed_event.data.scalar.anchor)
+            anchor = PyUnicode_FromYamlString(self.parsed_event.data.scalar.anchor)
         elif self.parsed_event.type == YAML_SEQUENCE_START_EVENT    \
                 and self.parsed_event.data.sequence_start.anchor != NULL:
-            anchor = PyUnicode_FromString(self.parsed_event.data.sequence_start.anchor)
+            anchor = PyUnicode_FromYamlString(self.parsed_event.data.sequence_start.anchor)
         elif self.parsed_event.type == YAML_MAPPING_START_EVENT    \
                 and self.parsed_event.data.mapping_start.anchor != NULL:
-            anchor = PyUnicode_FromString(self.parsed_event.data.mapping_start.anchor)
+            anchor = PyUnicode_FromYamlString(self.parsed_event.data.mapping_start.anchor)
         if anchor is not None:
             if anchor in self.anchors:
                 mark = Mark(self.stream_name,
@@ -761,12 +720,8 @@ cdef class CParser:
                         self.parsed_event.start_mark.line,
                         self.parsed_event.start_mark.column,
                         None, None)
-                if PY_MAJOR_VERSION < 3:
-                    raise ComposerError("found duplicate anchor; first occurrence",
-                            self.anchors[anchor].start_mark, "second occurrence", mark)
-                else:
-                    raise ComposerError(u"found duplicate anchor; first occurrence",
-                            self.anchors[anchor].start_mark, u"second occurrence", mark)
+                raise ComposerError(u"found duplicate anchor; first occurrence",
+                        self.anchors[anchor].start_mark, u"second occurrence", mark)
         self.descend_resolver(parent, index)
         if self.parsed_event.type == YAML_SCALAR_EVENT:
             node = self._compose_scalar_node(anchor)
@@ -788,7 +743,7 @@ cdef class CParser:
                 self.parsed_event.end_mark.line,
                 self.parsed_event.end_mark.column,
                 None, None)
-        value = PyUnicode_DecodeUTF8(self.parsed_event.data.scalar.value,
+        value = PyUnicode_DecodeUTF8(<char *>self.parsed_event.data.scalar.value,
                 self.parsed_event.data.scalar.length, 'strict')
         plain_implicit = False
         if self.parsed_event.data.scalar.plain_implicit == 1:
@@ -801,7 +756,7 @@ cdef class CParser:
                         and self.parsed_event.data.scalar.tag[1] == c'\0'):
             tag = self.resolve(ScalarNode, value, (plain_implicit, quoted_implicit))
         else:
-            tag = PyUnicode_FromString(self.parsed_event.data.scalar.tag)
+            tag = PyUnicode_FromYamlString(self.parsed_event.data.scalar.tag)
         style = None
         if self.parsed_event.data.scalar.style == YAML_PLAIN_SCALAR_STYLE:
             style = u''
@@ -834,7 +789,7 @@ cdef class CParser:
                         and self.parsed_event.data.sequence_start.tag[1] == c'\0'):
             tag = self.resolve(SequenceNode, None, implicit)
         else:
-            tag = PyUnicode_FromString(self.parsed_event.data.sequence_start.tag)
+            tag = PyUnicode_FromYamlString(self.parsed_event.data.sequence_start.tag)
         flow_style = None
         if self.parsed_event.data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE:
             flow_style = True
@@ -873,7 +828,7 @@ cdef class CParser:
                         and self.parsed_event.data.mapping_start.tag[1] == c'\0'):
             tag = self.resolve(MappingNode, None, implicit)
         else:
-            tag = PyUnicode_FromString(self.parsed_event.data.mapping_start.tag)
+            tag = PyUnicode_FromYamlString(self.parsed_event.data.mapping_start.tag)
         flow_style = None
         if self.parsed_event.data.mapping_start.style == YAML_FLOW_MAPPING_STYLE:
             flow_style = True
@@ -905,7 +860,7 @@ cdef class CParser:
                 raise error
         return 1
 
-cdef int input_handler(void *data, char *buffer, size_t size, size_t *read) except 0:
+cdef int input_handler(void *data, unsigned char *buffer, size_t size, size_t *read) except 0:
     cdef CParser parser
     parser = <CParser>data
     if parser.stream_cache is None:
@@ -913,18 +868,15 @@ cdef int input_handler(void *data, char *buffer, size_t size, size_t *read) exce
         if PyUnicode_CheckExact(value) != 0:
             value = PyUnicode_AsUTF8String(value)
             parser.unicode_source = 1
-        if PyString_CheckExact(value) == 0:
-            if PY_MAJOR_VERSION < 3:
-                raise TypeError("a string value is expected")
-            else:
-                raise TypeError(u"a string value is expected")
+        if PyBytes_CheckExact(value) == 0:
+            raise TypeError(u"a string value is expected")
         parser.stream_cache = value
         parser.stream_cache_pos = 0
-        parser.stream_cache_len = PyString_GET_SIZE(value)
-    if (parser.stream_cache_len - parser.stream_cache_pos) < size:
+        parser.stream_cache_len = PyBytes_GET_SIZE(value)
+    if (parser.stream_cache_len - parser.stream_cache_pos) < <int>size:
         size = parser.stream_cache_len - parser.stream_cache_pos
     if size > 0:
-        memcpy(buffer, PyString_AS_STRING(parser.stream_cache)
+        memcpy(buffer, PyBytes_AS_STRING(parser.stream_cache)
                             + parser.stream_cache_pos, size)
     read[0] = size
     parser.stream_cache_pos += size
@@ -957,12 +909,8 @@ cdef class CEmitter:
             raise MemoryError
         self.stream = stream
         self.dump_unicode = 0
-        if PY_MAJOR_VERSION < 3:
-            if getattr3(stream, 'encoding', None):
-                self.dump_unicode = 1
-        else:
-            if hasattr(stream, u'encoding'):
-                self.dump_unicode = 1
+        if hasattr(stream, u'encoding'):
+            self.dump_unicode = 1
         self.use_encoding = encoding
         yaml_emitter_set_output(&self.emitter, output_handler, <void *>self)    
         if canonical:
@@ -1003,15 +951,9 @@ cdef class CEmitter:
         if self.emitter.error == YAML_MEMORY_ERROR:
             return MemoryError
         elif self.emitter.error == YAML_EMITTER_ERROR:
-            if PY_MAJOR_VERSION < 3:
-                problem = self.emitter.problem
-            else:
-                problem = PyUnicode_FromString(self.emitter.problem)
+            problem = PyUnicode_FromString(self.emitter.problem)
             return EmitterError(problem)
-        if PY_MAJOR_VERSION < 3:
-            raise ValueError("no emitter error")
-        else:
-            raise ValueError(u"no emitter error")
+        raise ValueError(u"no emitter error")
 
     cdef int _object_to_event(self, object event_object, yaml_event_t *event) except 0:
         cdef yaml_encoding_t encoding
@@ -1023,9 +965,9 @@ cdef class CEmitter:
         cdef int implicit
         cdef int plain_implicit
         cdef int quoted_implicit
-        cdef char *anchor
-        cdef char *tag
-        cdef char *value
+        cdef yaml_char_t *anchor
+        cdef yaml_char_t *tag
+        cdef yaml_char_t *value
         cdef int length
         cdef yaml_scalar_style_t scalar_style
         cdef yaml_sequence_style_t sequence_style
@@ -1054,10 +996,7 @@ cdef class CEmitter:
             tag_directives_end = NULL
             if event_object.tags:
                 if len(event_object.tags) > 128:
-                    if PY_MAJOR_VERSION < 3:
-                        raise ValueError("too many tags")
-                    else:
-                        raise ValueError(u"too many tags")
+                    raise ValueError(u"too many tags")
                 tag_directives_start = tag_directives_value
                 tag_directives_end = tag_directives_value
                 cache = []
@@ -1066,21 +1005,15 @@ cdef class CEmitter:
                     if PyUnicode_CheckExact(handle):
                         handle = PyUnicode_AsUTF8String(handle)
                         cache.append(handle)
-                    if not PyString_CheckExact(handle):
-                        if PY_MAJOR_VERSION < 3:
-                            raise TypeError("tag handle must be a string")
-                        else:
-                            raise TypeError(u"tag handle must be a string")
-                    tag_directives_end.handle = PyString_AS_STRING(handle)
+                    if not PyBytes_CheckExact(handle):
+                        raise TypeError(u"tag handle must be a string")
+                    tag_directives_end.handle = PyBytes_AS_Yaml_STRING(handle)
                     if PyUnicode_CheckExact(prefix):
                         prefix = PyUnicode_AsUTF8String(prefix)
                         cache.append(prefix)
-                    if not PyString_CheckExact(prefix):
-                        if PY_MAJOR_VERSION < 3:
-                            raise TypeError("tag prefix must be a string")
-                        else:
-                            raise TypeError(u"tag prefix must be a string")
-                    tag_directives_end.prefix = PyString_AS_STRING(prefix)
+                    if not PyBytes_CheckExact(prefix):
+                        raise TypeError(u"tag prefix must be a string")
+                    tag_directives_end.prefix = PyBytes_AS_Yaml_STRING(prefix)
                     tag_directives_end = tag_directives_end+1
             implicit = 1
             if event_object.explicit:
@@ -1098,12 +1031,9 @@ cdef class CEmitter:
             anchor_object = event_object.anchor
             if PyUnicode_CheckExact(anchor_object):
                 anchor_object = PyUnicode_AsUTF8String(anchor_object)
-            if not PyString_CheckExact(anchor_object):
-                if PY_MAJOR_VERSION < 3:
-                    raise TypeError("anchor must be a string")
-                else:
-                    raise TypeError(u"anchor must be a string")
-            anchor = PyString_AS_STRING(anchor_object)
+            if not PyBytes_CheckExact(anchor_object):
+                raise TypeError(u"anchor must be a string")
+            anchor = PyBytes_AS_Yaml_STRING(anchor_object)
             if yaml_alias_event_initialize(event, anchor) == 0:
                 raise MemoryError
         elif event_class is ScalarEvent:
@@ -1112,33 +1042,24 @@ cdef class CEmitter:
             if anchor_object is not None:
                 if PyUnicode_CheckExact(anchor_object):
                     anchor_object = PyUnicode_AsUTF8String(anchor_object)
-                if not PyString_CheckExact(anchor_object):
-                    if PY_MAJOR_VERSION < 3:
-                        raise TypeError("anchor must be a string")
-                    else:
-                        raise TypeError(u"anchor must be a string")
-                anchor = PyString_AS_STRING(anchor_object)
+                if not PyBytes_CheckExact(anchor_object):
+                    raise TypeError(u"anchor must be a string")
+                anchor = PyBytes_AS_Yaml_STRING(anchor_object)
             tag = NULL
             tag_object = event_object.tag
             if tag_object is not None:
                 if PyUnicode_CheckExact(tag_object):
                     tag_object = PyUnicode_AsUTF8String(tag_object)
-                if not PyString_CheckExact(tag_object):
-                    if PY_MAJOR_VERSION < 3:
-                        raise TypeError("tag must be a string")
-                    else:
-                        raise TypeError(u"tag must be a string")
-                tag = PyString_AS_STRING(tag_object)
+                if not PyBytes_CheckExact(tag_object):
+                    raise TypeError(u"tag must be a string")
+                tag = PyBytes_AS_Yaml_STRING(tag_object)
             value_object = event_object.value
             if PyUnicode_CheckExact(value_object):
                 value_object = PyUnicode_AsUTF8String(value_object)
-            if not PyString_CheckExact(value_object):
-                if PY_MAJOR_VERSION < 3:
-                    raise TypeError("value must be a string")
-                else:
-                    raise TypeError(u"value must be a string")
-            value = PyString_AS_STRING(value_object)
-            length = PyString_GET_SIZE(value_object)
+            if not PyBytes_CheckExact(value_object):
+                raise TypeError(u"value must be a string")
+            value = PyBytes_AS_Yaml_STRING(value_object)
+            length = PyBytes_GET_SIZE(value_object)
             plain_implicit = 0
             quoted_implicit = 0
             if event_object.implicit is not None:
@@ -1163,23 +1084,17 @@ cdef class CEmitter:
             if anchor_object is not None:
                 if PyUnicode_CheckExact(anchor_object):
                     anchor_object = PyUnicode_AsUTF8String(anchor_object)
-                if not PyString_CheckExact(anchor_object):
-                    if PY_MAJOR_VERSION < 3:
-                        raise TypeError("anchor must be a string")
-                    else:
-                        raise TypeError(u"anchor must be a string")
-                anchor = PyString_AS_STRING(anchor_object)
+                if not PyBytes_CheckExact(anchor_object):
+                    raise TypeError(u"anchor must be a string")
+                anchor = PyBytes_AS_Yaml_STRING(anchor_object)
             tag = NULL
             tag_object = event_object.tag
             if tag_object is not None:
                 if PyUnicode_CheckExact(tag_object):
                     tag_object = PyUnicode_AsUTF8String(tag_object)
-                if not PyString_CheckExact(tag_object):
-                    if PY_MAJOR_VERSION < 3:
-                        raise TypeError("tag must be a string")
-                    else:
-                        raise TypeError(u"tag must be a string")
-                tag = PyString_AS_STRING(tag_object)
+                if not PyBytes_CheckExact(tag_object):
+                    raise TypeError(u"tag must be a string")
+                tag = PyBytes_AS_Yaml_STRING(tag_object)
             implicit = 0
             if event_object.implicit:
                 implicit = 1
@@ -1195,23 +1110,17 @@ cdef class CEmitter:
             if anchor_object is not None:
                 if PyUnicode_CheckExact(anchor_object):
                     anchor_object = PyUnicode_AsUTF8String(anchor_object)
-                if not PyString_CheckExact(anchor_object):
-                    if PY_MAJOR_VERSION < 3:
-                        raise TypeError("anchor must be a string")
-                    else:
-                        raise TypeError(u"anchor must be a string")
-                anchor = PyString_AS_STRING(anchor_object)
+                if not PyBytes_CheckExact(anchor_object):
+                    raise TypeError(u"anchor must be a string")
+                anchor = PyBytes_AS_Yaml_STRING(anchor_object)
             tag = NULL
             tag_object = event_object.tag
             if tag_object is not None:
                 if PyUnicode_CheckExact(tag_object):
                     tag_object = PyUnicode_AsUTF8String(tag_object)
-                if not PyString_CheckExact(tag_object):
-                    if PY_MAJOR_VERSION < 3:
-                        raise TypeError("tag must be a string")
-                    else:
-                        raise TypeError(u"tag must be a string")
-                tag = PyString_AS_STRING(tag_object)
+                if not PyBytes_CheckExact(tag_object):
+                    raise TypeError(u"tag must be a string")
+                tag = PyBytes_AS_Yaml_STRING(tag_object)
             implicit = 0
             if event_object.implicit:
                 implicit = 1
@@ -1226,10 +1135,7 @@ cdef class CEmitter:
         elif event_class is MappingEndEvent:
             yaml_mapping_end_event_initialize(event)
         else:
-            if PY_MAJOR_VERSION < 3:
-                raise TypeError("invalid event %s" % event_object)
-            else:
-                raise TypeError(u"invalid event %s" % event_object)
+            raise TypeError(u"invalid event %s" % event_object)
         return 1
 
     def emit(self, event_object):
@@ -1259,23 +1165,14 @@ cdef class CEmitter:
                 raise error
             self.closed = 0
         elif self.closed == 1:
-            if PY_MAJOR_VERSION < 3:
-                raise SerializerError("serializer is closed")
-            else:
-                raise SerializerError(u"serializer is closed")
+            raise SerializerError(u"serializer is closed")
         else:
-            if PY_MAJOR_VERSION < 3:
-                raise SerializerError("serializer is already opened")
-            else:
-                raise SerializerError(u"serializer is already opened")
+            raise SerializerError(u"serializer is already opened")
 
     def close(self):
         cdef yaml_event_t event
         if self.closed == -1:
-            if PY_MAJOR_VERSION < 3:
-                raise SerializerError("serializer is not opened")
-            else:
-                raise SerializerError(u"serializer is not opened")
+            raise SerializerError(u"serializer is not opened")
         elif self.closed == 0:
             yaml_stream_end_event_initialize(&event)
             if yaml_emitter_emit(&self.emitter, &event) == 0:
@@ -1291,15 +1188,9 @@ cdef class CEmitter:
         cdef yaml_tag_directive_t *tag_directives_start
         cdef yaml_tag_directive_t *tag_directives_end
         if self.closed == -1:
-            if PY_MAJOR_VERSION < 3:
-                raise SerializerError("serializer is not opened")
-            else:
-                raise SerializerError(u"serializer is not opened")
+            raise SerializerError(u"serializer is not opened")
         elif self.closed == 1:
-            if PY_MAJOR_VERSION < 3:
-                raise SerializerError("serializer is closed")
-            else:
-                raise SerializerError(u"serializer is closed")
+            raise SerializerError(u"serializer is closed")
         cache = []
         version_directive = NULL
         if self.use_version:
@@ -1310,10 +1201,7 @@ cdef class CEmitter:
         tag_directives_end = NULL
         if self.use_tags:
             if len(self.use_tags) > 128:
-                if PY_MAJOR_VERSION < 3:
-                    raise ValueError("too many tags")
-                else:
-                    raise ValueError(u"too many tags")
+                raise ValueError(u"too many tags")
             tag_directives_start = tag_directives_value
             tag_directives_end = tag_directives_value
             for handle in self.use_tags:
@@ -1321,21 +1209,15 @@ cdef class CEmitter:
                 if PyUnicode_CheckExact(handle):
                     handle = PyUnicode_AsUTF8String(handle)
                     cache.append(handle)
-                if not PyString_CheckExact(handle):
-                    if PY_MAJOR_VERSION < 3:
-                        raise TypeError("tag handle must be a string")
-                    else:
-                        raise TypeError(u"tag handle must be a string")
-                tag_directives_end.handle = PyString_AS_STRING(handle)
+                if not PyBytes_CheckExact(handle):
+                    raise TypeError(u"tag handle must be a string")
+                tag_directives_end.handle = PyBytes_AS_Yaml_STRING(handle)
                 if PyUnicode_CheckExact(prefix):
                     prefix = PyUnicode_AsUTF8String(prefix)
                     cache.append(prefix)
-                if not PyString_CheckExact(prefix):
-                    if PY_MAJOR_VERSION < 3:
-                        raise TypeError("tag prefix must be a string")
-                    else:
-                        raise TypeError(u"tag prefix must be a string")
-                tag_directives_end.prefix = PyString_AS_STRING(prefix)
+                if not PyBytes_CheckExact(prefix):
+                    raise TypeError(u"tag prefix must be a string")
+                tag_directives_end.prefix = PyBytes_AS_Yaml_STRING(prefix)
                 tag_directives_end = tag_directives_end+1
         if yaml_document_start_event_initialize(&event, version_directive,
                 tag_directives_start, tag_directives_end,
@@ -1376,9 +1258,9 @@ cdef class CEmitter:
         cdef int implicit
         cdef int plain_implicit
         cdef int quoted_implicit
-        cdef char *anchor
-        cdef char *tag
-        cdef char *value
+        cdef yaml_char_t *anchor
+        cdef yaml_char_t *tag
+        cdef yaml_char_t *value
         cdef int length
         cdef int item_index
         cdef yaml_scalar_style_t scalar_style
@@ -1389,12 +1271,9 @@ cdef class CEmitter:
         if anchor_object is not None:
             if PyUnicode_CheckExact(anchor_object):
                 anchor_object = PyUnicode_AsUTF8String(anchor_object)
-            if not PyString_CheckExact(anchor_object):
-                if PY_MAJOR_VERSION < 3:
-                    raise TypeError("anchor must be a string")
-                else:
-                    raise TypeError(u"anchor must be a string")
-            anchor = PyString_AS_STRING(anchor_object)
+            if not PyBytes_CheckExact(anchor_object):
+                raise TypeError(u"anchor must be a string")
+            anchor = PyBytes_AS_Yaml_STRING(anchor_object)
         if node in self.serialized_nodes:
             if yaml_alias_event_initialize(&event, anchor) == 0:
                 raise MemoryError
@@ -1417,22 +1296,16 @@ cdef class CEmitter:
                 if tag_object is not None:
                     if PyUnicode_CheckExact(tag_object):
                         tag_object = PyUnicode_AsUTF8String(tag_object)
-                    if not PyString_CheckExact(tag_object):
-                        if PY_MAJOR_VERSION < 3:
-                            raise TypeError("tag must be a string")
-                        else:
-                            raise TypeError(u"tag must be a string")
-                    tag = PyString_AS_STRING(tag_object)
+                    if not PyBytes_CheckExact(tag_object):
+                        raise TypeError(u"tag must be a string")
+                    tag = PyBytes_AS_Yaml_STRING(tag_object)
                 value_object = node.value
                 if PyUnicode_CheckExact(value_object):
                     value_object = PyUnicode_AsUTF8String(value_object)
-                if not PyString_CheckExact(value_object):
-                    if PY_MAJOR_VERSION < 3:
-                        raise TypeError("value must be a string")
-                    else:
-                        raise TypeError(u"value must be a string")
-                value = PyString_AS_STRING(value_object)
-                length = PyString_GET_SIZE(value_object)
+                if not PyBytes_CheckExact(value_object):
+                    raise TypeError(u"value must be a string")
+                value = PyBytes_AS_Yaml_STRING(value_object)
+                length = PyBytes_GET_SIZE(value_object)
                 style_object = node.style
                 scalar_style = YAML_PLAIN_SCALAR_STYLE
                 if style_object == "'" or style_object == u"'":
@@ -1458,12 +1331,9 @@ cdef class CEmitter:
                 if tag_object is not None:
                     if PyUnicode_CheckExact(tag_object):
                         tag_object = PyUnicode_AsUTF8String(tag_object)
-                    if not PyString_CheckExact(tag_object):
-                        if PY_MAJOR_VERSION < 3:
-                            raise TypeError("tag must be a string")
-                        else:
-                            raise TypeError(u"tag must be a string")
-                    tag = PyString_AS_STRING(tag_object)
+                    if not PyBytes_CheckExact(tag_object):
+                        raise TypeError(u"tag must be a string")
+                    tag = PyBytes_AS_Yaml_STRING(tag_object)
                 sequence_style = YAML_BLOCK_SEQUENCE_STYLE
                 if node.flow_style:
                     sequence_style = YAML_FLOW_SEQUENCE_STYLE
@@ -1490,12 +1360,9 @@ cdef class CEmitter:
                 if tag_object is not None:
                     if PyUnicode_CheckExact(tag_object):
                         tag_object = PyUnicode_AsUTF8String(tag_object)
-                    if not PyString_CheckExact(tag_object):
-                        if PY_MAJOR_VERSION < 3:
-                            raise TypeError("tag must be a string")
-                        else:
-                            raise TypeError(u"tag must be a string")
-                    tag = PyString_AS_STRING(tag_object)
+                    if not PyBytes_CheckExact(tag_object):
+                        raise TypeError(u"tag must be a string")
+                    tag = PyBytes_AS_Yaml_STRING(tag_object)
                 mapping_style = YAML_BLOCK_MAPPING_STYLE
                 if node.flow_style:
                     mapping_style = YAML_FLOW_MAPPING_STYLE
@@ -1515,11 +1382,13 @@ cdef class CEmitter:
             self.ascend_resolver()
         return 1
 
-cdef int output_handler(void *data, char *buffer, size_t size) except 0:
+cdef int output_handler(void *data, unsigned char *bufferu, size_t size) except 0:
     cdef CEmitter emitter
+    cdef char *buffer
+    buffer = <char *>bufferu
     emitter = <CEmitter>data
     if emitter.dump_unicode == 0:
-        value = PyString_FromStringAndSize(buffer, size)
+        value = PyBytes_FromStringAndSize(buffer, size)
     else:
         value = PyUnicode_DecodeUTF8(buffer, size, 'strict')
     emitter.stream.write(value)
diff --git a/contrib/python/PyYAML/py3/yaml/representer.py b/contrib/python/PyYAML/py3/yaml/representer.py
index 8d0d1fe251..aaf1632f06 100644
--- a/contrib/python/PyYAML/py3/yaml/representer.py
+++ b/contrib/python/PyYAML/py3/yaml/representer.py
@@ -369,7 +369,7 @@ Representer.add_representer(complex,
 Representer.add_representer(tuple,
         Representer.represent_tuple)
 
-Representer.add_representer(type,
+Representer.add_multi_representer(type,
         Representer.represent_name)
 
 Representer.add_representer(collections.OrderedDict,
diff --git a/contrib/python/PyYAML/py3/yaml/resolver.py b/contrib/python/PyYAML/py3/yaml/resolver.py
index 013896d2f1..3522bdaaf6 100644
--- a/contrib/python/PyYAML/py3/yaml/resolver.py
+++ b/contrib/python/PyYAML/py3/yaml/resolver.py
@@ -177,7 +177,7 @@ Resolver.add_implicit_resolver(
 Resolver.add_implicit_resolver(
         'tag:yaml.org,2002:float',
         re.compile(r'''^(?:[-+]?(?:[0-9][0-9_]*)\.[0-9_]*(?:[eE][-+][0-9]+)?
-                    |\.[0-9_]+(?:[eE][-+][0-9]+)?
+                    |\.[0-9][0-9_]*(?:[eE][-+][0-9]+)?
                     |[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\.[0-9_]*
                     |[-+]?\.(?:inf|Inf|INF)
                     |\.(?:nan|NaN|NAN))$''', re.X),
diff --git a/contrib/python/PyYAML/py3/yaml/scanner.py b/contrib/python/PyYAML/py3/yaml/scanner.py
index 7437ede1c6..de925b07f1 100644
--- a/contrib/python/PyYAML/py3/yaml/scanner.py
+++ b/contrib/python/PyYAML/py3/yaml/scanner.py
@@ -1211,7 +1211,7 @@ class Scanner:
                     for k in range(length):
                         if self.peek(k) not in '0123456789ABCDEFabcdef':
                             raise ScannerError("while scanning a double-quoted scalar", start_mark,
-                                    "expected escape sequence of %d hexdecimal numbers, but found %r" %
+                                    "expected escape sequence of %d hexadecimal numbers, but found %r" %
                                         (length, self.peek(k)), self.get_mark())
                     code = int(self.prefix(length), 16)
                     chunks.append(chr(code))
@@ -1403,7 +1403,7 @@ class Scanner:
             for k in range(2):
                 if self.peek(k) not in '0123456789ABCDEFabcdef':
                     raise ScannerError("while scanning a %s" % name, start_mark,
-                            "expected URI escape sequence of 2 hexdecimal numbers, but found %r"
+                            "expected URI escape sequence of 2 hexadecimal numbers, but found %r"
                             % self.peek(k), self.get_mark())
             codes.append(int(self.prefix(2), 16))
             self.forward(2)
diff --git a/contrib/python/PyYAML/ya.make b/contrib/python/PyYAML/ya.make
index 28498e997a..0b5842088e 100644
--- a/contrib/python/PyYAML/ya.make
+++ b/contrib/python/PyYAML/ya.make
@@ -5,13 +5,9 @@ LICENSE(Service-Py23-Proxy)
 VERSION(Service-proxy-version)
 
 IF (PYTHON2)
-    PEERDIR(
-        contrib/python/PyYAML/py2
-    )
+    PEERDIR(contrib/python/PyYAML/py2)
 ELSE()
-    PEERDIR(
-        contrib/python/PyYAML/py3
-    )
+    PEERDIR(contrib/python/PyYAML/py3)
 ENDIF()
 
 NO_LINT()
diff --git a/contrib/python/simplejson/py3/.dist-info/METADATA b/contrib/python/simplejson/py3/.dist-info/METADATA
index ba887cf80b..689e566f7f 100644
--- a/contrib/python/simplejson/py3/.dist-info/METADATA
+++ b/contrib/python/simplejson/py3/.dist-info/METADATA
@@ -1,6 +1,6 @@
 Metadata-Version: 2.1
 Name: simplejson
-Version: 3.19.2
+Version: 3.19.3
 Summary: Simple, fast, extensible JSON encoder/decoder for Python
 Home-page: https://github.com/simplejson/simplejson
 Author: Bob Ippolito
@@ -27,6 +27,7 @@ Classifier: Programming Language :: Python :: 3.9
 Classifier: Programming Language :: Python :: 3.10
 Classifier: Programming Language :: Python :: 3.11
 Classifier: Programming Language :: Python :: 3.12
+Classifier: Programming Language :: Python :: 3.13
 Classifier: Programming Language :: Python :: Implementation :: CPython
 Classifier: Programming Language :: Python :: Implementation :: PyPy
 Classifier: Topic :: Software Development :: Libraries :: Python Modules
diff --git a/contrib/python/simplejson/py3/simplejson/__init__.py b/contrib/python/simplejson/py3/simplejson/__init__.py
index 2d1900d8c4..d3ff141d00 100644
--- a/contrib/python/simplejson/py3/simplejson/__init__.py
+++ b/contrib/python/simplejson/py3/simplejson/__init__.py
@@ -118,7 +118,7 @@ Serializing multiple objects to JSON lines (newline-delimited JSON)::
 
 """
 from __future__ import absolute_import
-__version__ = '3.19.2'
+__version__ = '3.19.3'
 __all__ = [
     'dump', 'dumps', 'load', 'loads',
     'JSONDecoder', 'JSONDecodeError', 'JSONEncoder',
diff --git a/contrib/python/simplejson/py3/ya.make b/contrib/python/simplejson/py3/ya.make
index 18f54d4abd..7537b289e7 100644
--- a/contrib/python/simplejson/py3/ya.make
+++ b/contrib/python/simplejson/py3/ya.make
@@ -2,7 +2,7 @@
 
 PY3_LIBRARY()
 
-VERSION(3.19.2)
+VERSION(3.19.3)
 
 LICENSE(MIT)
 
diff --git a/yt/cpp/mapreduce/client/skiff.cpp b/yt/cpp/mapreduce/client/skiff.cpp
index f6e52f44e8..480ee4ef66 100644
--- a/yt/cpp/mapreduce/client/skiff.cpp
+++ b/yt/cpp/mapreduce/client/skiff.cpp
@@ -78,6 +78,7 @@ NSkiff::EWireType ValueTypeToSkiffType(EValueType valueType)
         case VT_STRING:
         case VT_UTF8:
         case VT_JSON:
+        case VT_UUID:
             return EWireType::String32;
 
         case VT_ANY:
diff --git a/yt/cpp/mapreduce/interface/common.cpp b/yt/cpp/mapreduce/interface/common.cpp
index 0a46c0b583..831762fa95 100644
--- a/yt/cpp/mapreduce/interface/common.cpp
+++ b/yt/cpp/mapreduce/interface/common.cpp
@@ -201,6 +201,9 @@ static NTi::TTypePtr OldTypeToTypeV3(EValueType type)
             return NTi::Timestamp64();
         case VT_INTERVAL64:
             return NTi::Interval64();
+
+        case VT_UUID:
+            return NTi::Uuid();
     }
 }
 
@@ -259,7 +262,7 @@ static std::pair<EValueType, bool> Simplify(const NTi::TTypePtr& type)
         case ETypeName::Decimal:
             return {VT_STRING, true};
         case ETypeName::Uuid:
-            break;
+            return {VT_UUID, true};
         case ETypeName::Yson:
             return {VT_ANY, true};
 
@@ -660,6 +663,9 @@ TString ToString(EValueType type)
             return "timestamp64";
         case VT_INTERVAL64:
             return "interval64";
+
+        case VT_UUID:
+            return "uuid";
     }
     ythrow yexception() << "Invalid value type " << static_cast<int>(type);
 }
diff --git a/yt/cpp/mapreduce/interface/common.h b/yt/cpp/mapreduce/interface/common.h
index 10988225dd..557f4ea6c4 100644
--- a/yt/cpp/mapreduce/interface/common.h
+++ b/yt/cpp/mapreduce/interface/common.h
@@ -412,6 +412,9 @@ enum EValueType : int
     VT_TIMESTAMP64,
     // Interval64, difference between two timestamps64 (signed)
     VT_INTERVAL64,
+
+    // Universally unique identifier according to RFC-4122.
+    VT_UUID,
 };
 
 ///
diff --git a/yt/cpp/mapreduce/interface/serialize.cpp b/yt/cpp/mapreduce/interface/serialize.cpp
index b195bf04d6..99f6f46b93 100644
--- a/yt/cpp/mapreduce/interface/serialize.cpp
+++ b/yt/cpp/mapreduce/interface/serialize.cpp
@@ -134,6 +134,8 @@ void Deserialize(EValueType& valueType, const TNode& node)
         {"datetime64", VT_DATETIME64},
         {"timestamp64", VT_TIMESTAMP64},
         {"interval64", VT_INTERVAL64},
+
+        {"uuid", VT_UUID},
     };
 
     auto it = str2ValueType.find(nodeStr);
diff --git a/yt/yt/core/http/helpers.h b/yt/yt/core/http/helpers.h
index 658236f1e5..f0da7d1118 100644
--- a/yt/yt/core/http/helpers.h
+++ b/yt/yt/core/http/helpers.h
@@ -40,6 +40,7 @@ inline const TString XContentTypeOptionsHeaderName("X-Content-Type-Options");
 inline const TString XRequestTimeoutHeaderName("X-Request-Timeout");
 
 inline const TString UserTicketHeaderName("X-Ya-User-Ticket");
+inline const TString ServiceTicketHeaderName("X-Ya-Service-Ticket");
 inline const TString XDnsPrefetchControlHeaderName("X-DNS-Prefetch-Control");
 inline const TString XForwardedForYHeaderName("X-Forwarded-For-Y");
 inline const TString XFrameOptionsHeaderName("X-Frame-Options");
diff --git a/yt/yt/core/rpc/service_detail.h b/yt/yt/core/rpc/service_detail.h
index 19c64c0359..21c9078e80 100644
--- a/yt/yt/core/rpc/service_detail.h
+++ b/yt/yt/core/rpc/service_detail.h
@@ -1136,8 +1136,6 @@ private:
     void ScheduleRequestsFromQueue();
     void RunRequest(TServiceBase::TServiceContextPtr context);
 
-    i64 GetTotalRequestSize(const TServiceBase::TServiceContextPtr& context);
-
     void IncrementQueueSize(const TServiceBase::TServiceContextPtr& context);
     void DecrementQueueSize(const TServiceBase::TServiceContextPtr& context);