物件協定
********

PyObject *Py_GetConstant(unsigned int constant_id)
    * 為 穩定 ABI 的一部分 自 3.13 版本開始.*

   Get a *strong reference* to a constant.

   如果 *constant_id* 無效，則設定一個例外並回傳 "NULL"。

   *constant_id* 必須是這些常數識別字之一：

   +------------------------------------------+-------+---------------------------+
   | 常數識別字                               | 數值  | 回傳物件                  |
   |==========================================|=======|===========================|
   | Py_CONSTANT_NONE                         | "0"   | "None"                    |
   +------------------------------------------+-------+---------------------------+
   | Py_CONSTANT_FALSE                        | "1"   | "False"                   |
   +------------------------------------------+-------+---------------------------+
   | Py_CONSTANT_TRUE                         | "2"   | "True"                    |
   +------------------------------------------+-------+---------------------------+
   | Py_CONSTANT_ELLIPSIS                     | "3"   | "Ellipsis"                |
   +------------------------------------------+-------+---------------------------+
   | Py_CONSTANT_NOT_IMPLEMENTED              | "4"   | "NotImplemented"          |
   +------------------------------------------+-------+---------------------------+
   | Py_CONSTANT_ZERO                         | "5"   | "0"                       |
   +------------------------------------------+-------+---------------------------+
   | Py_CONSTANT_ONE                          | "6"   | "1"                       |
   +------------------------------------------+-------+---------------------------+
   | Py_CONSTANT_EMPTY_STR                    | "7"   | "''"                      |
   +------------------------------------------+-------+---------------------------+
   | Py_CONSTANT_EMPTY_BYTES                  | "8"   | "b''"                     |
   +------------------------------------------+-------+---------------------------+
   | Py_CONSTANT_EMPTY_TUPLE                  | "9"   | "()"                      |
   +------------------------------------------+-------+---------------------------+

   Numeric values are only given for projects which cannot use the
   constant identifiers.

   在 3.13 版被加入.

   在 CPython 中，所有這些常數都是*不滅*的。

PyObject *Py_GetConstantBorrowed(unsigned int constant_id)
    * 為 穩定 ABI 的一部分 自 3.13 版本開始.*

   Similar to "Py_GetConstant()", but return a *borrowed reference*.

   This function is primarily intended for backwards compatibility:
   using "Py_GetConstant()" is recommended for new code.

   The reference is borrowed from the interpreter, and is valid until
   the interpreter finalization.

   在 3.13 版被加入.

PyObject *Py_NotImplemented

   The "NotImplemented" singleton, used to signal that an operation is
   not implemented for the given type combination.

Py_RETURN_NOTIMPLEMENTED

   Properly handle returning "Py_NotImplemented" from within a C
   function (that is, create a new *strong reference* to
   "NotImplemented" and return it).

Py_PRINT_RAW

   Flag to be used with multiple functions that print the object (like
   "PyObject_Print()" and "PyFile_WriteObject()"). If passed, these
   functions use the "str()" of the object instead of the "repr()".

int PyObject_Print(PyObject *o, FILE *fp, int flags)

   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()".

int PyObject_HasAttrWithError(PyObject *o, PyObject *attr_name)
    * 為 穩定 ABI 的一部分 自 3.13 版本開始.*

   Returns "1" if *o* has the attribute *attr_name*, and "0"
   otherwise. This is equivalent to the Python expression "hasattr(o,
   attr_name)". On failure, return "-1".

   在 3.13 版被加入.

int PyObject_HasAttrStringWithError(PyObject *o, const char *attr_name)
    * 為 穩定 ABI 的一部分 自 3.13 版本開始.*

   This is the same as "PyObject_HasAttrWithError()", but *attr_name*
   is specified as a const char* UTF-8 encoded bytes string, rather
   than a PyObject*.

   在 3.13 版被加入.

int PyObject_HasAttr(PyObject *o, PyObject *attr_name)
    * 為 穩定 ABI 的一部分.*

   Returns "1" if *o* has the attribute *attr_name*, and "0"
   otherwise. This function always succeeds.

   備註:

     Exceptions that occur when this calls "__getattr__()" and
     "__getattribute__()" methods aren't propagated, but instead given
     to "sys.unraisablehook()". For proper error handling, use
     "PyObject_HasAttrWithError()", "PyObject_GetOptionalAttr()" or
     "PyObject_GetAttr()" instead.

int PyObject_HasAttrString(PyObject *o, const char *attr_name)
    * 為 穩定 ABI 的一部分.*

   This is the same as "PyObject_HasAttr()", but *attr_name* is
   specified as a const char* UTF-8 encoded bytes string, rather than
   a PyObject*.

   備註:

     Exceptions that occur when this calls "__getattr__()" and
     "__getattribute__()" methods or while creating the temporary
     "str" object are silently ignored. For proper error handling, use
     "PyObject_HasAttrStringWithError()",
     "PyObject_GetOptionalAttrString()" or "PyObject_GetAttrString()"
     instead.

PyObject *PyObject_GetAttr(PyObject *o, PyObject *attr_name)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   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".

   If the missing attribute should not be treated as a failure, you
   can use "PyObject_GetOptionalAttr()" instead.

PyObject *PyObject_GetAttrString(PyObject *o, const char *attr_name)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   This is the same as "PyObject_GetAttr()", but *attr_name* is
   specified as a const char* UTF-8 encoded bytes string, rather than
   a PyObject*.

   If the missing attribute should not be treated as a failure, you
   can use "PyObject_GetOptionalAttrString()" instead.

int PyObject_GetOptionalAttr(PyObject *obj, PyObject *attr_name, PyObject **result);
    * 為 穩定 ABI 的一部分 自 3.13 版本開始.*

   Variant of "PyObject_GetAttr()" which doesn't raise
   "AttributeError" if the attribute is not found.

   If the attribute is found, return "1" and set **result* to a new
   *strong reference* to the attribute. If the attribute is not found,
   return "0" and set **result* to "NULL"; the "AttributeError" is
   silenced. If an error other than "AttributeError" is raised, return
   "-1" and set **result* to "NULL".

   在 3.13 版被加入.

int PyObject_GetOptionalAttrString(PyObject *obj, const char *attr_name, PyObject **result);
    * 為 穩定 ABI 的一部分 自 3.13 版本開始.*

   This is the same as "PyObject_GetOptionalAttr()", but *attr_name*
   is specified as a const char* UTF-8 encoded bytes string, rather
   than a PyObject*.

   在 3.13 版被加入.

PyObject *PyObject_GenericGetAttr(PyObject *o, PyObject *name)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   Generic attribute getter function that is meant to be put into a
   type object's "tp_getattro" slot.  It looks for a descriptor in the
   dictionary of classes in the object's MRO as well as an attribute
   in the object's "__dict__" (if present).  As outlined in 實作描述器
   , data descriptors take preference over instance attributes, while
   non-data descriptors don't.  Otherwise, an "AttributeError" is
   raised.

int PyObject_SetAttr(PyObject *o, PyObject *attr_name, PyObject *v)
    * 為 穩定 ABI 的一部分.*

   Set the value of the attribute named *attr_name*, for object *o*,
   to the value *v*. Raise an exception and return "-1" on failure;
   return "0" on success.  This is the equivalent of the Python
   statement "o.attr_name = v".

   If *v* is "NULL", the attribute is deleted. This behaviour is
   deprecated in favour of using "PyObject_DelAttr()", but there are
   currently no plans to remove it.

int PyObject_SetAttrString(PyObject *o, const char *attr_name, PyObject *v)
    * 為 穩定 ABI 的一部分.*

   This is the same as "PyObject_SetAttr()", but *attr_name* is
   specified as a const char* UTF-8 encoded bytes string, rather than
   a PyObject*.

   If *v* is "NULL", the attribute is deleted, but this feature is
   deprecated in favour of using "PyObject_DelAttrString()".

   The number of different attribute names passed to this function
   should be kept small, usually by using a statically allocated
   string as *attr_name*. For attribute names that aren't known at
   compile time, prefer calling "PyUnicode_FromString()" and
   "PyObject_SetAttr()" directly. For more details, see
   "PyUnicode_InternFromString()", which may be used internally to
   create a key object.

int PyObject_GenericSetAttr(PyObject *o, PyObject *name, PyObject *value)
    * 為 穩定 ABI 的一部分.*

   Generic attribute setter and deleter function that is meant to be
   put into a type object's "tp_setattro" slot.  It looks for a data
   descriptor in the dictionary of classes in the object's MRO, and if
   found it takes preference over setting or deleting the attribute in
   the instance dictionary. Otherwise, the attribute is set or deleted
   in the object's "__dict__" (if present). On success, "0" is
   returned, otherwise an "AttributeError" is raised and "-1" is
   returned.

int PyObject_DelAttr(PyObject *o, PyObject *attr_name)
    * 為 穩定 ABI 的一部分 自 3.13 版本開始.*

   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_DelAttrString(PyObject *o, const char *attr_name)
    * 為 穩定 ABI 的一部分 自 3.13 版本開始.*

   This is the same as "PyObject_DelAttr()", but *attr_name* is
   specified as a const char* UTF-8 encoded bytes string, rather than
   a PyObject*.

   The number of different attribute names passed to this function
   should be kept small, usually by using a statically allocated
   string as *attr_name*. For attribute names that aren't known at
   compile time, prefer calling "PyUnicode_FromString()" and
   "PyObject_DelAttr()" directly. For more details, see
   "PyUnicode_InternFromString()", which may be used internally to
   create a key object for lookup.

PyObject *PyObject_GenericGetDict(PyObject *o, void *context)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分 自 3.10 版本開始.*

   A generic implementation for the getter of a "__dict__" descriptor.
   It creates the dictionary if necessary.

   This function may also be called to get the "__dict__" of the
   object *o*. Pass "NULL" for *context* when calling it. Since this
   function may need to allocate memory for the dictionary, it may be
   more efficient to call "PyObject_GetAttr()" when accessing an
   attribute on the object.

   在失敗時，會回傳 "NULL" 並設定例外。

   在 3.3 版被加入.

int PyObject_GenericSetDict(PyObject *o, PyObject *value, void *context)
    * 為 穩定 ABI 的一部分 自 3.7 版本開始.*

   A generic implementation for the setter of a "__dict__" descriptor.
   This implementation does not allow the dictionary to be deleted.

   在 3.3 版被加入.

PyObject **_PyObject_GetDictPtr(PyObject *obj)

   Return a pointer to "__dict__" of the object *obj*. If there is no
   "__dict__", return "NULL" without setting an exception.

   This function may need to allocate memory for the dictionary, so it
   may be more efficient to call "PyObject_GetAttr()" when accessing
   an attribute on the object.

PyObject *PyObject_RichCompare(PyObject *o1, PyObject *o2, int opid)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   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.

int PyObject_RichCompareBool(PyObject *o1, PyObject *o2, int opid)
    * 為 穩定 ABI 的一部分.*

   Compare the values of *o1* and *o2* using the operation specified
   by *opid*, like "PyObject_RichCompare()", but returns "-1" on
   error, "0" if the result is false, "1" otherwise.

備註:

  If *o1* and *o2* are the same object, "PyObject_RichCompareBool()"
  will always return "1" for "Py_EQ" and "0" for "Py_NE".

PyObject *PyObject_Format(PyObject *obj, PyObject *format_spec)
    * 為 穩定 ABI 的一部分.*

   Format *obj* using *format_spec*. This is equivalent to the Python
   expression "format(obj, format_spec)".

   *format_spec* may be "NULL". In this case the call is equivalent to
   "format(obj)". Returns the formatted string on success, "NULL" on
   failure.

PyObject *PyObject_Repr(PyObject *o)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   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.

   在 3.4 版的變更: This function now includes a debug assertion to
   help ensure that it does not silently discard an active exception.

PyObject *PyObject_ASCII(PyObject *o)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   As "PyObject_Repr()", compute a string representation of object
   *o*, but escape the non-ASCII characters in the string returned by
   "PyObject_Repr()" with "\x", "\u" or "\U" escapes.  This generates
   a string similar to that returned by "PyObject_Repr()" in Python 2.
   Called by the "ascii()" built-in function.

PyObject *PyObject_Str(PyObject *o)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   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, therefore, by the "print()"
   function.

   在 3.4 版的變更: This function now includes a debug assertion to
   help ensure that it does not silently discard an active exception.

PyObject *PyObject_Bytes(PyObject *o)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   Compute a bytes representation of object *o*.  "NULL" is returned
   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.

int PyObject_IsSubclass(PyObject *derived, PyObject *cls)
    * 為 穩定 ABI 的一部分.*

   Return "1" if the class *derived* is identical to or derived from
   the class *cls*, otherwise return "0".  In case of an error, return
   "-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 *cls* has a "__subclasscheck__()" method, it will be called to
   determine the subclass status as described in **PEP 3119**.
   Otherwise, *derived* is a subclass of *cls* if it is a direct or
   indirect subclass, i.e. contained in "cls.__mro__".

   Normally only class objects, i.e. instances of "type" or a derived
   class, are considered classes.  However, objects can override this
   by having a "__bases__" attribute (which must be a tuple of base
   classes).

int PyObject_IsInstance(PyObject *inst, PyObject *cls)
    * 為 穩定 ABI 的一部分.*

   Return "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 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 *cls* has a "__instancecheck__()" method, it will be called to
   determine the subclass status as described in **PEP 3119**.
   Otherwise, *inst* is an instance of *cls* if its class is a
   subclass of *cls*.

   An instance *inst* can override what is considered its class by
   having a "__class__" attribute.

   An object *cls* can override if it is considered a class, and what
   its base classes are, by having a "__bases__" attribute (which must
   be a tuple of base classes).

Py_hash_t PyObject_Hash(PyObject *o)
    * 為 穩定 ABI 的一部分.*

   Compute and return the hash value of an object *o*.  On failure,
   return "-1". This is the equivalent of the Python expression
   "hash(o)".

   在 3.2 版的變更: The return type is now Py_hash_t.  This is a
   signed integer the same size as "Py_ssize_t".

Py_hash_t PyObject_HashNotImplemented(PyObject *o)
    * 為 穩定 ABI 的一部分.*

   Set a "TypeError" indicating that "type(o)" is not *hashable* and
   return "-1". This function receives special treatment when stored
   in a "tp_hash" slot, allowing a type to explicitly indicate to the
   interpreter that it is not hashable.

int PyObject_IsTrue(PyObject *o)
    * 為 穩定 ABI 的一部分.*

   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".

int PyObject_Not(PyObject *o)
    * 為 穩定 ABI 的一部分.*

   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".

PyObject *PyObject_Type(PyObject *o)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   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 creates a new *strong reference* to the
   return value. There's really no reason to use this function instead
   of the "Py_TYPE()" function, which returns a pointer of type
   PyTypeObject*, except when a new *strong reference* is needed.

int PyObject_TypeCheck(PyObject *o, PyTypeObject *type)

   Return non-zero if the object *o* is of type *type* or a subtype of
   *type*, and "0" otherwise.  Both parameters must be non-"NULL".

Py_ssize_t PyObject_Size(PyObject *o)
Py_ssize_t PyObject_Length(PyObject *o)
    * 為 穩定 ABI 的一部分.*

   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(PyObject *o, Py_ssize_t defaultvalue)

   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,
   defaultvalue)".

   在 3.4 版被加入.

PyObject *PyObject_GetItem(PyObject *o, PyObject *key)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   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(PyObject *o, PyObject *key, PyObject *v)
    * 為 穩定 ABI 的一部分.*

   Map the object *key* to the value *v*.  Raise an exception and
   return "-1" on failure; return "0" on success.  This is the
   equivalent of the Python statement "o[key] = v".  This function
   *does not* steal a reference to *v*.

int PyObject_DelItem(PyObject *o, PyObject *key)
    * 為 穩定 ABI 的一部分.*

   Remove the mapping for the object *key* from the object *o*.
   Return "-1" on failure.  This is equivalent to the Python statement
   "del o[key]".

int PyObject_DelItemString(PyObject *o, const char *key)
    * 為 穩定 ABI 的一部分.*

   This is the same as "PyObject_DelItem()", but *key* is specified as
   a const char* UTF-8 encoded bytes string, rather than a PyObject*.

PyObject *PyObject_Dir(PyObject *o)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   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.

PyObject *PyObject_GetIter(PyObject *o)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   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.

PyObject *PyObject_SelfIter(PyObject *obj)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分.*

   This is equivalent to the Python "__iter__(self): return self"
   method. It is intended for *iterator* types, to be used in the
   "PyTypeObject.tp_iter" slot.

PyObject *PyObject_GetAIter(PyObject *o)
    *回傳值：新的參照。** 為 穩定 ABI 的一部分 自 3.10 版本開始.*

   This is the equivalent to the Python expression "aiter(o)". Takes
   an "AsyncIterable" object and returns an "AsyncIterator" for it.
   This is typically a new iterator but if the argument is an
   "AsyncIterator", this returns itself. Raises "TypeError" and
   returns "NULL" if the object cannot be iterated.

   在 3.10 版被加入.

void *PyObject_GetTypeData(PyObject *o, PyTypeObject *cls)
    * 為 穩定 ABI 的一部分 自 3.12 版本開始.*

   Get a pointer to subclass-specific data reserved for *cls*.

   The object *o* must be an instance of *cls*, and *cls* must have
   been created using negative "PyType_Spec.basicsize". Python does
   not check this.

   錯誤時設定一個例外並回傳 "NULL"。

   在 3.12 版被加入.

Py_ssize_t PyType_GetTypeDataSize(PyTypeObject *cls)
    * 為 穩定 ABI 的一部分 自 3.12 版本開始.*

   Return the size of the instance memory space reserved for *cls*,
   i.e. the size of the memory "PyObject_GetTypeData()" returns.

   This may be larger than requested using "-PyType_Spec.basicsize";
   it is safe to use this larger size (e.g. with "memset()").

   The type *cls* **must** have been created using negative
   "PyType_Spec.basicsize". Python does not check this.

   錯誤時設定一個例外並回傳一個負值。

   在 3.12 版被加入.

void *PyObject_GetItemData(PyObject *o)

   Get a pointer to per-item data for a class with
   "Py_TPFLAGS_ITEMS_AT_END".

   錯誤時設定一個例外並回傳 "NULL"。如果 *o* 沒有設定
   "Py_TPFLAGS_ITEMS_AT_END"，則會引發 "TypeError"。

   在 3.12 版被加入.

int PyObject_VisitManagedDict(PyObject *obj, visitproc visit, void *arg)

   Visit the managed dictionary of *obj*.

   This function must only be called in a traverse function of the
   type which has the "Py_TPFLAGS_MANAGED_DICT" flag set.

   在 3.13 版被加入.

void PyObject_ClearManagedDict(PyObject *obj)

   Clear the managed dictionary of *obj*.

   This function must only be called in a clear function of the type
   which has the "Py_TPFLAGS_MANAGED_DICT" flag set.

   在 3.13 版被加入.

int PyUnstable_Object_EnableDeferredRefcount(PyObject *obj)

   *這是 不穩定 API，它可能在小版本發布中沒有任何警告地被變更。*

   Enable deferred reference counting on *obj*, if supported by the
   runtime.  In the *free-threaded* build, this allows the interpreter
   to avoid reference count adjustments to *obj*, which may improve
   multi-threaded performance.  The tradeoff is that *obj* will only
   be deallocated by the tracing garbage collector, and not when the
   interpreter no longer has any references to it.

   This function returns "1" if deferred reference counting is enabled
   on *obj*, and "0" if deferred reference counting is not supported
   or if the hint was ignored by the interpreter, such as when
   deferred reference counting is already enabled on *obj*. This
   function is thread-safe, and cannot fail.

   This function does nothing on builds with the *GIL* enabled, which
   do not support deferred reference counting. This also does nothing
   if *obj* is not an object tracked by the garbage collector (see
   "gc.is_tracked()" and "PyObject_GC_IsTracked()").

   This function is intended to be used soon after *obj* is created,
   by the code that creates it, such as in the object's "tp_new" slot.

   在 3.14 版被加入.

int PyUnstable_Object_IsUniqueReferencedTemporary(PyObject *obj)

   *這是 不穩定 API，它可能在小版本發布中沒有任何警告地被變更。*

   Check if *obj* is a unique temporary object. Returns "1" if *obj*
   is known to be a unique temporary object, and "0" otherwise.  This
   function cannot fail, but the check is conservative, and may return
   "0" in some cases even if *obj* is a unique temporary object.

   If an object is a unique temporary, it is guaranteed that the
   current code has the only reference to the object. For arguments to
   C functions, this should be used instead of checking if the
   reference count is "1". Starting with Python 3.14, the interpreter
   internally avoids some reference count modifications when loading
   objects onto the operands stack by *borrowing* references when
   possible, which means that a reference count of "1" by itself does
   not guarantee that a function argument uniquely referenced.

   In the example below, "my_func" is called with a unique temporary
   object as its argument:

      my_func([1, 2, 3])

   In the example below, "my_func" is **not** called with a unique
   temporary object as its argument, even if its refcount is "1":

      my_list = [1, 2, 3]
      my_func(my_list)

   另請參閱 "Py_REFCNT()" 函式。

   在 3.14 版被加入.

int PyUnstable_IsImmortal(PyObject *obj)

   *這是 不穩定 API，它可能在小版本發布中沒有任何警告地被變更。*

   This function returns non-zero if *obj* is *immortal*, and zero
   otherwise. This function cannot fail.

   備註:

     Objects that are immortal in one CPython version are not
     guaranteed to be immortal in another.

   在 3.14 版被加入.

int PyUnstable_TryIncRef(PyObject *obj)

   *這是 不穩定 API，它可能在小版本發布中沒有任何警告地被變更。*

   Increments the reference count of *obj* if it is not zero.  Returns
   "1" if the object's reference count was successfully incremented.
   Otherwise, this function returns "0".

   "PyUnstable_EnableTryIncRef()" must have been called earlier on
   *obj* or this function may spuriously return "0" in the *free
   threading* build.

   This function is logically equivalent to the following C code,
   except that it behaves atomically in the *free threading* build:

      if (Py_REFCNT(op) > 0) {
         Py_INCREF(op);
         return 1;
      }
      return 0;

   This is intended as a building block for managing weak references
   without the overhead of a Python weak reference object.

   Typically, correct use of this function requires support from
   *obj*'s deallocator ("tp_dealloc"). For example, the following
   sketch could be adapted to implement a "weakmap" that works like a
   "WeakValueDictionary" for a specific type:

      PyMutex mutex;

      PyObject *
      add_entry(weakmap_key_type *key, PyObject *value)
      {
          PyUnstable_EnableTryIncRef(value);
          weakmap_type weakmap = ...;
          PyMutex_Lock(&mutex);
          weakmap_add_entry(weakmap, key, value);
          PyMutex_Unlock(&mutex);
          Py_RETURN_NONE;
      }

      PyObject *
      get_value(weakmap_key_type *key)
      {
          weakmap_type weakmap = ...;
          PyMutex_Lock(&mutex);
          PyObject *result = weakmap_find(weakmap, key);
          if (PyUnstable_TryIncRef(result)) {
              // `result` is safe to use
              PyMutex_Unlock(&mutex);
              return result;
          }
          // if we get here, `result` is starting to be garbage-collected,
          // but has not been removed from the weakmap yet
          PyMutex_Unlock(&mutex);
          return NULL;
      }

      // tp_dealloc function for weakmap values
      void
      value_dealloc(PyObject *value)
      {
          weakmap_type weakmap = ...;
          PyMutex_Lock(&mutex);
          weakmap_remove_value(weakmap, value);

          ...
          PyMutex_Unlock(&mutex);
      }

   在 3.14 版被加入.

void PyUnstable_EnableTryIncRef(PyObject *obj)

   *這是 不穩定 API，它可能在小版本發布中沒有任何警告地被變更。*

   Enables subsequent uses of "PyUnstable_TryIncRef()" on *obj*.  The
   caller must hold a *strong reference* to *obj* when calling this.

   在 3.14 版被加入.

int PyUnstable_Object_IsUniquelyReferenced(PyObject *op)

   *這是 不穩定 API，它可能在小版本發布中沒有任何警告地被變更。*

   Determine if *op* only has one reference.

   On GIL-enabled builds, this function is equivalent to Py_REFCNT(op)
   == 1.

   On a *free threaded* build, this checks if *op*'s *reference count*
   is equal to one and additionally checks if *op* is only used by
   this thread. Py_REFCNT(op) == 1 is **not** thread-safe on free
   threaded builds; prefer this function.

   The caller must hold an *attached thread state*, despite the fact
   that this function doesn't call into the Python interpreter. This
   function cannot fail.

   在 3.14 版被加入.
