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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.
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