Protocole Objet
***************

PyObject *Py_GetConstant(unsigned int constant_id)
    * Part of the Stable ABI Depuis la version 3.13.*

   Get a *strong reference* to a constant.

   Set an exception and return "NULL" if *constant_id* is invalid.

   *constant_id* must be one of these constant identifiers:

   +------------------------------------------+-------+---------------------------+
   | Constant Identifier                      | Vale  | Returned object           |
   |                                          | ur    |                           |
   |==========================================|=======|===========================|
   | 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.

   Ajouté dans la version 3.13.

   **Particularité de l'implémentation CPython :** In CPython, all of
   these constants are *immortal*.

PyObject *Py_GetConstantBorrowed(unsigned int constant_id)
    * Part of the Stable ABI Depuis la version 3.13.*

   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.

   Ajouté dans la version 3.13.

PyObject *Py_NotImplemented

   Le singleton "NotImplemented", utilisé pour signaler qu'une
   opération n'est pas implémentée pour la combinaison de types en
   question.

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
   function would 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)
    * Part of the Stable ABI Depuis la version 3.13.*

   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".

   Ajouté dans la version 3.13.

int PyObject_HasAttrStringWithError(PyObject *o, const char *attr_name)
    * Part of the Stable ABI Depuis la version 3.13.*

   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*.

   Ajouté dans la version 3.13.

int PyObject_HasAttr(PyObject *o, PyObject *attr_name)
    * Part of the Stable ABI.*

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

   Note:

     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)
    * Part of the Stable ABI.*

   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*.

   Note:

     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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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);
    * Part of the Stable ABI Depuis la version 3.13.*

   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".

   Ajouté dans la version 3.13.

int PyObject_GetOptionalAttrString(PyObject *obj, const char *attr_name, PyObject **result);
    * Part of the Stable ABI Depuis la version 3.13.*

   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*.

   Ajouté dans la version 3.13.

PyObject *PyObject_GenericGetAttr(PyObject *o, PyObject *name)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   Accesseur d'attribut générique destiné à être mis dans le *slot*
   "tp_getattro" d'un objet type. Recherche un descripteur dans le
   dictionnaire de classes du MRO de l'objet ainsi qu'un attribut dans
   le "__dict__"  de l'objet (si présent). Comme défini dans
   Implémentation de descripteurs, les descripteurs de données sont
   prioritaires sur les attributs d'instance, contrairement aux autres
   descripteurs. Sinon, une "AttributeError" est levée.

int PyObject_SetAttr(PyObject *o, PyObject *attr_name, PyObject *v)
    * Part of the Stable ABI.*

   Définit la valeur de l'attribut nommé *attr_name*, pour l'objet
   *o*, à la valeur *v*. Lève une exception et renvoie "-1" en cas
   d'échec ; renvoie "0" en cas de succès. Ceci est équivalent à
   l'instruction Python "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)
    * Part of the Stable ABI.*

   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)
    * Part of the Stable ABI.*

   Accesseur et suppresseur générique d'attributs qui est fait pour
   être mis dans le "tp_setattro" d'un objet type. Il cherche un
   descripteur de données dans le dictionnaire de classes dans le MRO
   de l'objet et, si ce descripteur est trouvé, c'est lui qui est
   utilisé de préférence pour la suppression et la définition de
   l'attribut dans le dictionnaire d'instance. Sinon, l'attribut est
   défini ou supprimé dans le  "__dict__" de l'objet (si présent). En
   cas de succès, "0" est renvoyé, sinon une "AttributeError" est
   levée et "-1" est renvoyé.

int PyObject_DelAttr(PyObject *o, PyObject *attr_name)
    * Part of the Stable ABI Depuis la version 3.13.*

   Supprime l'attribut nommé *attr_name*, pour l'objet *o*. Renvoie
   "-1" en cas d'échec. Ceci est l'équivalent de l'expression Python
   "del o.attr_name".

int PyObject_DelAttrString(PyObject *o, const char *attr_name)
    * Part of the Stable ABI Depuis la version 3.13.*

   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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI
   Depuis la version 3.10.*

   Une implémentation générique de l'accesseur d'un descripteur d'un
   "__dict__". Crée le dictionnaire si nécessaire.

   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.

   On failure, returns "NULL" with an exception set.

   Ajouté dans la version 3.3.

int PyObject_GenericSetDict(PyObject *o, PyObject *value, void *context)
    * Part of the Stable ABI Depuis la version 3.7.*

   Une implémentation générique du mutateur d'un descripteur de
   "__dict__". Cette implémentation n'autorise pas la suppression du
   dictionnaire.

   Ajouté dans la version 3.3.

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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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)
    * Part of the Stable ABI.*

   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.

Note:

  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)
    * Part of the Stable ABI.*

   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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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.

   Modifié dans la version 3.4: Cette fonction inclut maintenant une
   assertion de débogage afin d'assurer qu'elle ne passe pas sous
   silence une exception active.

PyObject *PyObject_ASCII(PyObject *o)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   Comme "PyObject_Repr()", calcule une représentation en chaîne de
   caractères de l'objet *o*, mais échappe les caractères non ASCII
   dans la chaîne de caractères renvoyée par "PyObject_Repr()" avec'
   "\x", "\u" ou "\U". Cela génère une chaîne de caractères similaire
   à celle renvoyée par "PyObject_Repr()" en Python 2. Appelée par la
   fonction native "ascii()".

PyObject *PyObject_Str(PyObject *o)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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.

   Modifié dans la version 3.4: Cette fonction inclut maintenant une
   assertion de débogage afin d'assurer qu'elle ne passe pas sous
   silence une exception active.

PyObject *PyObject_Bytes(PyObject *o)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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)
    * Part of the Stable ABI.*

   Renvoie "1" si la classe *derived* est identique à ou dérivée de la
   classe *cls*, renvoie "0" sinon. En cas d'erreur, renvoie "-1".

   Si *cls* est un *n*-uplet, la vérification est menée sur chaque
   entrée de *cls*. Le résultat sera "1" quand au moins une des
   vérifications renvoie "1", sinon ce sera "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)
    * Part of the Stable ABI.*

   Renvoie "1" si *inst* est une instance de la classe *cls* ou une
   sous-classe de *cls*, ou "0" sinon. En cas d'erreur, renvoie "-1"
   et initialise une exception.

   Si *cls* est un *n*-uplet, la vérification est menée sur chaque
   entrée de *cls*. Le résultat sera "1" quand au moins une des
   vérifications renvoie "1", sinon ce sera "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)
    * Part of the Stable ABI.*

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

   Modifié dans la version 3.2: 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)
    * Part of the Stable ABI.*

   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)
    * Part of the Stable ABI.*

   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)
    * Part of the Stable ABI.*

   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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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)
    * Part of the Stable ABI.*

   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)".

   Ajouté dans la version 3.4.

PyObject *PyObject_GetItem(PyObject *o, PyObject *key)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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)
    * Part of the Stable ABI.*

   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)
    * Part of the Stable ABI.*

   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)
    * Part of the Stable ABI.*

   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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI.*

   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)
    *Valeur de retour : nouvelle référence.** Part of the Stable ABI
   Depuis la version 3.10.*

   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.

   Ajouté dans la version 3.10.

void *PyObject_GetTypeData(PyObject *o, PyTypeObject *cls)
    * Part of the Stable ABI Depuis la version 3.12.*

   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.

   On error, set an exception and return "NULL".

   Ajouté dans la version 3.12.

Py_ssize_t PyType_GetTypeDataSize(PyTypeObject *cls)
    * Part of the Stable ABI Depuis la version 3.12.*

   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.

   On error, set an exception and return a negative value.

   Ajouté dans la version 3.12.

void *PyObject_GetItemData(PyObject *o)

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

   On error, set an exception and return "NULL". "TypeError" is raised
   if *o* does not have "Py_TPFLAGS_ITEMS_AT_END" set.

   Ajouté dans la version 3.12.

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.

   Ajouté dans la version 3.13.

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.

   Ajouté dans la version 3.13.

int PyUnstable_Object_EnableDeferredRefcount(PyObject *obj)

   *This is Unstable API. It may change without warning in minor
   releases.*

   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.

   Ajouté dans la version 3.14.

int PyUnstable_Object_IsUniqueReferencedTemporary(PyObject *obj)

   *This is Unstable API. It may change without warning in minor
   releases.*

   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)

   See also the function "Py_REFCNT()".

   Ajouté dans la version 3.14.

int PyUnstable_IsImmortal(PyObject *obj)

   *This is Unstable API. It may change without warning in minor
   releases.*

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

   Note:

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

   Ajouté dans la version 3.14.

int PyUnstable_TryIncRef(PyObject *obj)

   *This is Unstable API. It may change without warning in minor
   releases.*

   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);
      }

   Ajouté dans la version 3.14.

void PyUnstable_EnableTryIncRef(PyObject *obj)

   *This is Unstable API. It may change without warning in minor
   releases.*

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

   Ajouté dans la version 3.14.

int PyUnstable_Object_IsUniquelyReferenced(PyObject *op)

   *This is Unstable API. It may change without warning in minor
   releases.*

   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.

   Ajouté dans la version 3.14.
