Objetos tipo
************

type PyTypeObject
    * Part of the Stable ABI (as an opaque struct).*

   La estructura C de los objetos utilizados para describir los tipos
   incorporados.

PyTypeObject PyType_Type
    * Part of the Stable ABI.*

   Este es el objeto tipo para objetos tipo; es el mismo objeto que
   "type" en la capa Python.

int PyType_Check(PyObject *o)

   Retorna un valor distinto de cero si el objeto *o* es un objeto
   tipo, incluidas las instancias de tipos derivados del objeto de
   tipo estándar. Retorna 0 en todos los demás casos. Esta función
   siempre finaliza con éxito.

int PyType_CheckExact(PyObject *o)

   Retorna un valor distinto de cero si el objeto *o* es un objeto
   tipo, pero no un subtipo del objeto tipo estándar. Retorna 0 en
   todos los demás casos. Esta función siempre finaliza con éxito.

unsigned int PyType_ClearCache()
    * Part of the Stable ABI.*

   Borra la caché de búsqueda interna. Retorna la etiqueta (*tag*) de
   la versión actual.

unsigned long PyType_GetFlags(PyTypeObject *type)
    * Part of the Stable ABI.*

   Retorna el miembro "tp_flags" de *type*. Esta función está
   destinada principalmente para su uso con "Py_LIMITED_API"; se
   garantiza que los bits de bandera individuales serán estables en
   las versiones de Python, pero el acceso a "tp_flags" en sí mismo no
   forma parte de la API limitada.

   Added in version 3.2.

   Distinto en la versión 3.4: El tipo de retorno es ahora "unsigned
   long" en vez de "long".

PyObject *PyType_GetDict(PyTypeObject *type)

   Retorna el espacio de nombres interno del objeto tipo, que de otra
   manera solo está expuesto a través de un *proxy* de solo lectura
   ("cls.__dict__"). Esto es un reemplazo para acceder a "tp_dict"
   directamente. El diccionario retornado debe tratarse como de solo
   lectura.

   Esta función está destinada a casos específicos de incrustación y
   vinculación de lenguajes, donde el acceso directo al diccionario es
   necesario y el acceso indirecto (por ejemplo, a través del *proxy*
   o "PyObject_GetAttr()") no es adecuado.

   Los módulos de extensión deben continuar usando "tp_dict", directa
   o indirectamente, al configurar sus propios tipos.

   Added in version 3.12.

void PyType_Modified(PyTypeObject *type)
    * Part of the Stable ABI.*

   Invalida la memoria caché de búsqueda interna para el tipo y todos
   sus subtipos. Esta función debe llamarse después de cualquier
   modificación manual de los atributos o clases base del tipo.

int PyType_AddWatcher(PyType_WatchCallback callback)

   Registra *callback* como un observador de tipo. Retorna un ID
   entero no negativo que debe pasarse a llamadas futuras a
   "PyType_Watch()". En caso de error (por ejemplo, no hay más IDs de
   observador disponibles), retorna "-1" y establece una excepción.

   In free-threaded builds, "PyType_AddWatcher()" is not thread-safe,
   so it must be called at start up (before spawning the first
   thread).

   Added in version 3.12.

int PyType_ClearWatcher(int watcher_id)

   Borra el observador identificado por *watcher_id* (previamente
   retornado de "PyType_AddWatcher()"). Retorna "0" en caso de éxito,
   "-1" en caso de error (por ejemplo, si *watcher_id* nunca fue
   registrado).

   Una extensión nunca debe llamar a "PyType_ClearWatcher" con un
   *watcher_id* que no le fue retornado por una llamada previa a
   "PyType_AddWatcher()".

   Added in version 3.12.

int PyType_Watch(int watcher_id, PyObject *type)

   Marca *type* como observado. El retrollamada (*callback*) otorgado
   *watcher_id* por "PyType_AddWatcher()" será llamado cada vez que
   "PyType_Modified()" reporte un cambio a *type*. (El *callback*
   puede ser llamado solo una vez para una serie de modificaciones
   consecutivas a *type*, si "_PyType_Lookup()" no es llamado en
   *type* entre las modificaciones; esto es un detalle de
   implementación y sujeto a cambios).

   The callback is also invoked when a watched heap type is
   deallocated.

   Una extensión nunca debe llamar a "PyType_Watch" con un
   *watcher_id* que no le fue retornado por una llamada previa a
   "PyType_AddWatcher()".

   Added in version 3.12.

   Distinto en la versión 3.15: The callback is now also invoked when
   a watched heap type is deallocated.

int PyType_Unwatch(int watcher_id, PyObject *type)

   Mark *type* as not watched. This undoes a previous call to
   "PyType_Watch()". *type* must not be "NULL".

   An extension should never call this function with a *watcher_id*
   that was not returned to it by a previous call to
   "PyType_AddWatcher()".

   On success, this function returns "0". On failure, this function
   returns "-1" with an exception set.

   Added in version 3.12.

typedef int (*PyType_WatchCallback)(PyObject *type)

   Tipo de una función de retrollamada (*callback*) de observador de
   tipo.

   El retrollamada (*callback*) no debe modificar *type* o causar que
   "PyType_Modified()" sea llamado en *type* o cualquier tipo en su
   MRO; violar esta regla podría causar recursión infinita.

   The callback may be called during type deallocation. In this case,
   the type object is temporarily resurrected (its reference count is
   at least 1) and all its attributes are still valid. However, the
   callback should not store new strong references to the type, as
   this would resurrect the object and prevent its deallocation.

   Added in version 3.12.

   Distinto en la versión 3.15: The callback may now be called during
   deallocation of a watched heap type.

int PyType_HasFeature(PyTypeObject *o, int feature)

   Retorna un valor distinto de cero si el tipo objeto *o* establece
   la característica *feature*. Las características de tipo se indican
   mediante flags de un solo bit.

int PyType_FastSubclass(PyTypeObject *type, int flag)

   Return non-zero if the type object *type* sets the subclass flag
   *flag*. Subclass flags are denoted by "Py_TPFLAGS_*_SUBCLASS". This
   function is used by many "_Check" functions for common types.

   Ver también:

     "PyObject_TypeCheck()", which is used as a slower alternative in
     "_Check" functions for types that don't come with subclass flags.

int PyType_IS_GC(PyTypeObject *o)

   Retorna verdadero si el objeto tipo incluye soporte para el
   detector de ciclos; esto prueba el indicador de tipo
   "Py_TPFLAGS_HAVE_GC".

int PyType_IsSubtype(PyTypeObject *a, PyTypeObject *b)
    * Part of the Stable ABI.*

   Retorna verdadero si *a* es un subtipo de *b*.

   Esta función solo busca subtipos reales, lo que significa que
   "__subclasscheck__()" no se llama en *b*. Llama
   "PyObject_IsSubclass()" para hacer la misma verificación que
   "issubclass()" haría.

PyObject *PyType_GenericAlloc(PyTypeObject *type, Py_ssize_t nitems)
    *Return value: New reference.** Part of the Stable ABI.*

   Generic handler for the "tp_alloc" slot of a type object.  Uses
   Python's default memory allocation mechanism to allocate memory for
   a new instance, zeros the memory, then initializes the memory as if
   by calling "PyObject_Init()" or "PyObject_InitVar()".

   Do not call this directly to allocate memory for an object; call
   the type's "tp_alloc" slot instead.

   For types that support garbage collection (i.e., the
   "Py_TPFLAGS_HAVE_GC" flag is set), this function behaves like
   "PyObject_GC_New" or "PyObject_GC_NewVar" (except the memory is
   guaranteed to be zeroed before initialization), and should be
   paired with "PyObject_GC_Del()" in "tp_free". Otherwise, it behaves
   like "PyObject_New" or "PyObject_NewVar" (except the memory is
   guaranteed to be zeroed before initialization) and should be paired
   with "PyObject_Free()" in "tp_free".

PyObject *PyType_GenericNew(PyTypeObject *type, PyObject *args, PyObject *kwds)
    *Return value: New reference.** Part of the Stable ABI.*

   Generic handler for the "tp_new" slot of a type object.  Creates a
   new instance using the type's "tp_alloc" slot and returns the
   resulting object.

int PyType_Ready(PyTypeObject *type)
    * Part of the Stable ABI.*

   Finalizar un objeto tipo. Se debe llamar a todos los objetos tipo
   para finalizar su inicialización. Esta función es responsable de
   agregar ranuras heredadas de la clase base de un tipo. Retorna "0"
   en caso de éxito o retorna "-1" y establece una excepción en caso
   de error.

   Nota:

     Si algunas de las clases base implementan el protocolo GC y el
     tipo proporcionado no incluye "Py_TPFLAGS_HAVE_GC" en sus
     banderas, entonces el protocolo GC se implementará
     automáticamente desde sus padres. Por el contrario, si el tipo
     que se está creando incluye "Py_TPFLAGS_HAVE_GC" en sus banderas,
     entonces **debe** implementar el protocolo GC por sí mismo
     implementando al menos el manejador "tp_traverse".

PyObject *PyType_GetName(PyTypeObject *type)
    *Return value: New reference.** Part of the Stable ABI since
   version 3.11.*

   Retorna el nombre del tipo. Equivalente a obtener el atributo
   "__name__" del tipo.

   Added in version 3.11.

PyObject *PyType_GetQualName(PyTypeObject *type)
    *Return value: New reference.** Part of the Stable ABI since
   version 3.11.*

   Retorna el nombre calificado del tipo. Equivalente a obtener el
   atributo "__qualname__" del tipo.

   Added in version 3.11.

PyObject *PyType_GetFullyQualifiedName(PyTypeObject *type)
    * Part of the Stable ABI since version 3.13.*

   Retorna el nombre completamente calificado del tipo. Equivalente a
   "f"{type.__module__}.{type.__qualname__}"", o "type.__qualname__"
   si "type.__module__" no es una cadena de caracteres o es igual a
   ""builtins"".

   Added in version 3.13.

PyObject *PyType_GetModuleName(PyTypeObject *type)
    * Part of the Stable ABI since version 3.13.*

   Retorna el nombre del módulo del tipo. Equivalente a obtener el
   atributo "type.__module__".

   Added in version 3.13.

void *PyType_GetSlot(PyTypeObject *type, int slot)
    * Part of the Stable ABI since version 3.4.*

   Retorna el puntero de función almacenado en la ranura dada. Si el
   resultado es "NULL", esto indica que la ranura es "NULL" o que la
   función se llamó con parámetros no válidos. Las personas que llaman
   suelen convertir el puntero de resultado en el tipo de función
   apropiado.

   Consulte "PyType_Slot.slot" para conocer los posibles valores del
   argumento *slot*.

   Added in version 3.4.

   Distinto en la versión 3.10: "PyType_GetSlot()" ahora puede aceptar
   todos los tipos. Anteriormente, estaba limitado a heap types.

PyObject *PyType_GetModule(PyTypeObject *type)
    *Return value: Borrowed reference.** Part of the Stable ABI since
   version 3.10.*

   Retorna el objeto módulo asociado con el tipo dado cuando se creó
   el tipo usando "PyType_FromModuleAndSpec()".

   The returned reference is *borrowed* from *type*, and will be valid
   as long as you hold a reference to *type*. Do not release it with
   "Py_DECREF()" or similar.

   Si no hay ningún módulo asociado con el tipo dado, establece
   "TypeError" y retorna "NULL".

   This function is usually used to get the module in which a method
   is defined. Note that in such a method,
   "PyType_GetModule(Py_TYPE(self))" may not return the intended
   result. "Py_TYPE(self)" may be a *subclass* of the intended class,
   and subclasses are not necessarily defined in the same module as
   their superclass. See "PyCMethod" to get the class that defines the
   method. See "PyType_GetModuleByToken()" for cases when "PyCMethod"
   cannot be used.

   Added in version 3.9.

void *PyType_GetModuleState(PyTypeObject *type)
    * Part of the Stable ABI since version 3.10.*

   Retorna el estado del objeto de módulo asociado con el tipo dado.
   Este es un atajo para llamar "PyModule_GetState()" en el resultado
   de "PyType_GetModule()".

   Si no hay ningún módulo asociado con el tipo dado, establece
   "TypeError" y retorna "NULL".

   Si el tipo *type* tiene un módulo asociado pero su estado es
   "NULL", retorna "NULL" sin establecer una excepción.

   Added in version 3.9.

PyObject *PyType_GetModuleByToken(PyTypeObject *type, const void *mod_token)
    *Return value: New reference.** Part of the Stable ABI since
   version 3.15.*

   Find the first superclass whose module has the given module token,
   and return that module.

   Si no se encuentra ningún módulo, lanza "TypeError" y retorna
   "NULL".

   Esta función está pensada para ser utilizada junto con
   "PyModule_GetState()" para obtener el estado del módulo de los
   métodos de ranura (como "tp_init" o "nb_add") y en otros lugares
   donde la clase que define a un método no se puede pasar utilizando
   la convención de llamada "PyCMethod".

   Added in version 3.15.

PyObject *PyType_GetModuleByDef(PyTypeObject *type, struct PyModuleDef *def)
    *Return value: Borrowed reference.** Part of the Stable ABI since
   version 3.13.*

   Find the first superclass whose module was created from the given
   "PyModuleDef" *def*, or whose module token is equal to *def*, and
   return that module.

   Note that modules created from a "PyModuleDef" always have their
   token set to the "PyModuleDef"'s address. In other words, this
   function is equivalent to "PyType_GetModuleByToken()", except that
   it:

   * returns a borrowed reference, and

   * has a non-"void*" argument type (which is a cosmetic difference
     in C).

   The returned reference is *borrowed* from *type*, and will be valid
   as long as you hold a reference to *type*. Do not release it with
   "Py_DECREF()" or similar.

   Added in version 3.11.

int PyType_GetBaseByToken(PyTypeObject *type, void *tp_token, PyTypeObject **result)
    * Part of the Stable ABI since version 3.14.*

   Find the first superclass in *type*'s *method resolution order*
   whose "Py_tp_token" token is equal to *tp_token*.

   * If found, set **result* to a new *strong reference* to it and
     return "1".

   * If not found, set **result* to "NULL" and return "0".

   * On error, set **result* to "NULL" and return "-1" with an
     exception set.

   The *result* argument may be "NULL", in which case **result* is not
   set. Use this if you need only the return value.

   The *tp_token* argument may not be "NULL".

   Added in version 3.14.

int PyUnstable_Type_AssignVersionTag(PyTypeObject *type)

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

   Intenta asignar una etiqueta (*tag*) de versión al tipo dado.

   Retorna 1 si el tipo ya tenía una etiqueta (*tag*) de versión
   válida o se asignó una nueva, o 0 si no se pudo asignar una nueva
   etiqueta.

   Added in version 3.12.

int PyType_SUPPORTS_WEAKREFS(PyTypeObject *type)

   Return true if instances of *type* support creating weak
   references, false otherwise. This function always succeeds. *type*
   must not be "NULL".

   Ver también:

     * Objetos de referencia débil

     * "weakref"


Crear tipos asignados en montículo (*heap*)
===========================================

The following function is used to create heap types:

PyObject *PyType_FromSlots(const PySlot *slots)
    * Part of the Stable ABI since version 3.15.*

   Create and return a heap type from a "PySlot" array. See Definition
   slots for general information on slots, and Type slot IDs for slots
   specific to type creation.

   Esta función llama "PyType_Ready()" en el tipo nuevo.

   Nota que esta función *no* coincide completamente con el
   comportamiento de llamar "type()" o usar la sentencia "class". Con
   tipos base o metaclases proporcionados por el usuario, prefiera
   llamar "type" (o la metaclase) sobre las funciones "PyType_From*".
   Específicamente:

   * "__new__()" no es llamado en la nueva clase (y debe ser
     establecido a "type.__new__").

   * "__init__()" no es llamado en la nueva clase.

   * "__init_subclass__()" no es llamado en ninguna base.

   * "__set_name__()" no es llamado en nuevos descriptores.

   Slots are typically defined as a global static constant arrays.
   However, sometimes slot values are not statically known at compile
   time. For example, slots like "Py_tp_bases", "Py_tp_metaclass" and
   "Py_tp_module" require live Python objects. In this case, it is
   recommended to put such slots on the stack, and use
   "Py_slot_subslots" to refer to an array of static slots. For
   example:

      static const PySlot my_slots[] = {
         PySlot_STATIC_DATA(Py_tp_name, "MyClass"),
         PySlot_FUNC(Py_tp_repr, my_repr_func),
         ...
         PySlot_END
      };

      PyObject *make_my_class(PyObject *module) {
         PySlot all_slots[] = {
            PySlot_STATIC_DATA(Py_slot_subslots, my_slots),
            PySlot_DATA(Py_tp_module, module),
            PySlot_END
         };
         return PyType_FromSlots(all_slots);
      }

Heap types created without the "Py_TPFLAGS_IMMUTABLETYPE" flag may be
modified, for example by setting attributes on them, as with classes
defined in Python code. Sometimes, such modifications are necessary to
fully initialize a type, but you may wish to prevent users from
changing the type after the initialization is done:

int PyType_Freeze(PyTypeObject *type)
    * Part of the Stable ABI since version 3.14.*

   Make a type immutable: set the "Py_TPFLAGS_IMMUTABLETYPE" flag.

   All base classes of *type* must be immutable.

   On success, return "0". On error, set an exception and return "-1".

   The type must not be used before it's made immutable. For example,
   type instances must not be created before the type is made
   immutable.

   Added in version 3.14.


Type slot IDs
-------------

Most type slot IDs are named like the field names of the structures
"PyTypeObject", "PyNumberMethods", "PySequenceMethods",
"PyMappingMethods" and "PyAsyncMethods" with an added "Py_" prefix.
For example, use:

* "Py_tp_dealloc" to set "PyTypeObject.tp_dealloc"

* "Py_nb_add" to set "PyNumberMethods.nb_add"

* "Py_sq_length" to set "PySequenceMethods.sq_length"

The following slots need additional considerations when specified as
slots:

* "Py_tp_name"

* "Py_tp_basicsize" and "Py_tp_extra_basicsize"

* "Py_tp_itemsize"

* "Py_tp_flags"

Additional slots do not directly correspond to a "PyTypeObject" struct
field:

* "Py_tp_token"

* "Py_tp_metaclass"

* "Py_tp_module"

The following “offset” fields cannot be set using "PyType_Slot":

* "tp_weaklistoffset" (use "Py_TPFLAGS_MANAGED_WEAKREF" en su lugar si
  es posible)

* "tp_dictoffset" (use "Py_TPFLAGS_MANAGED_DICT" en su lugar si es
  posible)

* "tp_vectorcall_offset" (use ""__vectorcalloffset__"" en PyMemberDef)

If it is not possible to switch to a "MANAGED" flag (for example, for
vectorcall or to support Python older than 3.12), specify the offset
in "Py_tp_members". See PyMemberDef documentation for details.

The following internal fields cannot be set at all when creating a
heap type:

* "tp_dict", "tp_mro", "tp_cache", "tp_subclasses", and "tp_weaklist".

The "Py_tp_base" slot is equivalent to "Py_tp_bases"; both may be set
either to a type or a tuple of types. If both are specified, the value
of "Py_tp_bases" is used.

Slot values may not be "NULL", except for the following:

* "Py_tp_doc"

* "Py_tp_token" (for clarity, prefer "Py_TP_USE_SPEC" rather than
  "NULL")

Distinto en la versión 3.9: Las ranuras en "PyBufferProcs" se pueden
configurar en la API ilimitada.

Distinto en la versión 3.11: "bf_getbuffer" y "bf_releasebuffer" ahora
están disponibles bajo la API limitada.

Distinto en la versión 3.14: The field "tp_vectorcall" can now be set
using "Py_tp_vectorcall".  See the field's documentation for details.

Distinto en la versión 3.15: The "Py_tp_bases" slot may be set to a
single type object, making it equivalent to the "Py_tp_base" slot.
Previously, a tuple of types was required.

The following slots correspond to fields in the underlying type
structure, but need extra remarks for use as slots:

Py_tp_name
    * Part of the Stable ABI since version 3.15.*

   "Slot ID" for the name of the type, used to set
   "PyTypeObject.tp_name".

   This slot (or "PyType_Spec.name()") is required to create a type.

   This may not be used in "PyType_Spec.slots". Use
   "PyType_Spec.name()" instead.

   **Detalles de implementación de CPython:** CPython processes slots
   in order. It is recommended to put "Py_tp_name" at the beginning of
   the slots array, so that if processing of a later slots fails,
   error messages can include the name.

   Added in version 3.15.

Py_tp_basicsize
    * Part of the Stable ABI since version 3.15.*

   "Slot ID" for the size of the instance in bytes. It is used to set
   "PyTypeObject.tp_basicsize".

   The value must be positive.

   This may not be used in "PyType_Spec.slots". Use
   "PyType_Spec.basicsize()" instead.

   This slot may not be used with "PyType_GetSlot()". Use
   "PyTypeObject.tp_basicsize" instead if needed, but be aware that a
   type's size is often considered an implementation detail.

   Added in version 3.15.

Py_tp_extra_basicsize
    * Part of the Stable ABI since version 3.15.*

   "Slot ID" for type data size in bytes, that is, how much space
   instances of the class need *in addition* to space needed for
   superclasses.

   The value is used, together with the size of superclasses, to set
   "PyTypeObject.tp_basicsize". Python will insert padding as needed
   to meet "tp_basicsize"'s alignment requirements.

   Use "PyObject_GetTypeData()" to get a pointer to subclass-specific
   memory reserved this way.

   The value must be positive. To specify that instances need no
   additional size (that is, size should be inherited), omit the
   "Py_tp_extra_basicsize" slot rather than set it to zero.

   Specifying both "Py_tp_basicsize" and "Py_tp_extra_basicsize" is an
   error.

   This may not be used in "PyType_Spec.slots". Use negative
   "PyType_Spec.basicsize()" instead.

   This slot may not be used with "PyType_GetSlot()".

   Added in version 3.15.

Py_tp_itemsize
    * Part of the Stable ABI since version 3.15.*

   "Slot ID" for the size of one element of a variable-size type, in
   bytes. Used to set "PyTypeObject.tp_itemsize". See "tp_itemsize"
   documentation for caveats.

   The value must be positive.

   If this slot is missing, "tp_itemsize" is inherited. Extending
   arbitrary variable-sized classes is dangerous, since some types use
   a fixed offset for variable-sized memory, which can then overlap
   fixed-sized memory used by a subclass. To help prevent mistakes,
   inheriting "itemsize" is only possible in the following situations:

   * La base no es de tamaño variable (su "tp_itemsize").

   * El "PyType_Spec.basicsize" solicitado es positivo, sugiriendo que
     la distribución de memoria de la clase base es conocida.

   * El "PyType_Spec.basicsize" solicitado es cero, sugiriendo que la
     subclase no accede a la memoria de la instancia directamente.

   * Con la bandera "Py_TPFLAGS_ITEMS_AT_END".

   This may not be used in "PyType_Spec.slots". Use
   "PyType_Spec.itemsize()" instead.

   This slot may not be used with "PyType_GetSlot()".

   Added in version 3.15.

Py_tp_flags
    * Part of the Stable ABI since version 3.15.*

   "Slot ID" for type flags, used to set "PyTypeObject.tp_flags".

   The "Py_TPFLAGS_HEAPTYPE" flag is not set,
   "PyType_FromSpecWithBases()" sets it automatically.

   This may not be used in "PyType_Spec.slots". Use negative
   "PyType_Spec.basicsize()" instead.

   This slot may not be used with "PyType_GetSlot()". Use
   "PyType_GetFlags()" instead.

   Added in version 3.15.

The following slots do not correspond to public fields in the
underlying structures:

Py_tp_metaclass
    * Part of the Stable ABI since version 3.15.*

   "Slot ID" for the metaclass used to construct the resulting type
   object. When omitted the metaclass is derived from bases
   ("Py_tp_bases" or the *bases* argument of
   "PyType_FromMetaclass()").

   Metaclasses that override "tp_new" are not supported, except if
   "tp_new" is "NULL".

   This may not be used in "PyType_Spec.slots". Use
   "PyType_FromMetaclass()" to specify a metaclass with "PyType_Spec".

   This slot may not be used with "PyType_GetSlot()". Use "Py_TYPE()"
   on the type object instead.

   Added in version 3.15.

Py_tp_module
    * Part of the Stable ABI since version 3.15.*

   "Slot ID" for recording the module in which the new class is
   defined.

   The value must be a module object. The module is associated with
   the new type and can later be retrieved with "PyType_GetModule()".
   The associated module is not inherited by subclasses; it must be
   specified for each class individually.

   This may not be used in "PyType_Spec.slots". Use
   "PyType_FromMetaclass()" to specify a module with "PyType_Spec".

   This slot may not be used with "PyType_GetSlot()". Use
   "PyType_GetModule()" instead.

   Added in version 3.15.

Py_tp_token
    * Part of the Stable ABI since version 3.14.*

   "Slot ID" for recording a static memory layout ID for a class.

   If the class is defined using a "PyType_Spec", and that spec is
   statically allocated, the token can be set to the spec using the
   special value "Py_TP_USE_SPEC":

      static PyType_Slot foo_slots[] = {
         {Py_tp_token, Py_TP_USE_SPEC},

   It can also be set to an arbitrary pointer, but you must ensure
   that:

   * The pointer outlives the class, so it's not reused for something
     else while the class exists.

   * It "belongs" to the extension module where the class lives, so it
     will not clash with other extensions.

   Use "PyType_GetBaseByToken()" to check if a class's superclass has
   a given token -- that is, check whether the memory layout is
   compatible.

   To get the token for a given class (without considering
   superclasses), use "PyType_GetSlot()" with "Py_tp_token".

   Added in version 3.14.

   Py_TP_USE_SPEC
       * Part of the Stable ABI since version 3.14.*

      Used as a value with "Py_tp_token" to set the token to the
      class's "PyType_Spec". May only be used for classes defined
      using "PyType_Spec".

      Expands to "NULL".

      Added in version 3.14.

Py_tp_slots
    * Part of the Stable ABI since version 3.15.*

   "Slot ID" that works like "Py_slot_subslots", except it specifies
   an array of "PyType_Slot" structures.

   Added in version 3.15.


Soft-deprecated API
===================

The following functions are *soft deprecated*. They will continue to
work, but new features will be added as slots for
"PyType_FromSlots()", not as arguments to new "PyType_From*"
functions.

PyObject *PyType_FromMetaclass(PyTypeObject *metaclass, PyObject *module, PyType_Spec *spec, PyObject *bases)
    * Part of the Stable ABI since version 3.12.*

   Crea y retorna un tipo heap a partir del *spec* (ver
   "Py_TPFLAGS_HEAPTYPE").

   A non-"NULL" *metaclass* argument corresponds to the
   "Py_tp_metaclass" slot.

   A non-"NULL" *bases* argument corresponds to the "Py_tp_bases"
   slot, and takes precedence over "Py_tp_bases" and "Py_tp_bases"
   slots.

   A non-"NULL" *module* argument corresponds to the "Py_tp_module"
   slot.

   Esta función llama "PyType_Ready()" en el tipo nuevo.

   Note that this function does *not* fully match the behavior of
   calling "type()" or using the "class" statement. See the note in
   "PyType_FromSlots()" documentation for details.

   Added in version 3.12.

   Soft deprecated since version 3.16.0a0 (unreleased): Prefer
   "PyType_FromSlots()" in new code.

PyObject *PyType_FromModuleAndSpec(PyObject *module, PyType_Spec *spec, PyObject *bases)
    *Return value: New reference.** Part of the Stable ABI since
   version 3.10.*

   Equivalente a "PyType_FromMetaclass(NULL, module, spec, bases)".

   Added in version 3.9.

   Distinto en la versión 3.10: La función ahora acepta una sola clase
   como argumento *bases* y "NULL" como ranura "tp_doc".

   Distinto en la versión 3.12: La función ahora encuentra y usa una
   metaclase correspondiente a las clases base proporcionadas.
   Anteriormente, sólo se retornaban instancias de "type".The "tp_new"
   of the metaclass is *ignored*. which may result in incomplete
   initialization. Creating classes whose metaclass overrides "tp_new"
   is deprecated.

   Distinto en la versión 3.14: Creating classes whose metaclass
   overrides "tp_new" is no longer allowed.

   Soft deprecated since version 3.16.0a0 (unreleased): Prefer
   "PyType_FromSlots()" in new code.

PyObject *PyType_FromSpecWithBases(PyType_Spec *spec, PyObject *bases)
    *Return value: New reference.** Part of the Stable ABI since
   version 3.3.*

   Equivalente a "PyType_FromMetaclass(NULL, NULL, spec, bases)".

   Added in version 3.3.

   Distinto en la versión 3.12: La función ahora encuentra y usa una
   metaclase correspondiente a las clases base proporcionadas.
   Anteriormente, sólo se retornaban instancias de "type".The "tp_new"
   of the metaclass is *ignored*. which may result in incomplete
   initialization. Creating classes whose metaclass overrides "tp_new"
   is deprecated.

   Distinto en la versión 3.14: Creating classes whose metaclass
   overrides "tp_new" is no longer allowed.

   Soft deprecated since version 3.16.0a0 (unreleased): Prefer
   "PyType_FromSlots()" in new code.

PyObject *PyType_FromSpec(PyType_Spec *spec)
    *Return value: New reference.** Part of the Stable ABI.*

   Equivalente a "PyType_FromMetaclass(NULL, NULL, spec, NULL)".

   Distinto en la versión 3.12: La función ahora encuentra y usa una
   metaclase correspondiente a las clases base proporcionadas en las
   ranuras *Py_tp_base[s]*. Anteriormente, sólo se retornaban
   instancias de "type".The "tp_new" of the metaclass is *ignored*.
   which may result in incomplete initialization. Creating classes
   whose metaclass overrides "tp_new" is deprecated.

   Distinto en la versión 3.14: Creating classes whose metaclass
   overrides "tp_new" is no longer allowed.

   Soft deprecated since version 3.16.0a0 (unreleased): Prefer
   "PyType_FromSlots()" in new code.

type PyType_Spec
    * Part of the Stable ABI (including all members).*

   Structure defining a type's behavior, used for soft-deprecated
   functions like "PyType_FromMetaclass()".

   This structure contains several members that can instead be
   specified as slots for "PyType_FromSlots()", and an array of slot
   entries with a simpler structure.

   const char *name

      Corresponds to "Py_tp_name".

   int basicsize

      If positive, corresponds to "Py_tp_basicsize".

      If negative, corresponds to "Py_tp_extra_basicsize" set to the
      absolute value.

      Distinto en la versión 3.12: Anteriormente, este campo no podía
      ser negativo.

   int itemsize

      Corresponds to "Py_tp_itemsize".

   unsigned int flags

      Corresponds to "Py_tp_flags".

   PyType_Slot *slots

      Array of "PyType_Slot" (not "PySlot") structures.

      Terminated by the special slot value "{0, NULL}". Each slot ID
      should be specified at most once.

      type PyType_Slot
          * Part of the Stable ABI (including all members).*

         Structure defining optional functionality of a type, used for
         soft-deprecated functions like "PyType_FromMetaclass()".

         Note that a "PyType_Slot" array may be included in a "PySlot"
         array using "Py_tp_slots", and vice versa using
         "Py_slot_subslots".

         Each "PyType_Slot" structure "tpslot" is interpreted as the
         following "PySlot" structure:

            (PySlot){
               .sl_id=tpslot.slot,
               .sl_flags=PySlot_INTPTR | sub_static,
               .sl_ptr=tpslot.func
            }

         where "sub_static" is "PySlot_STATIC" if the slot requires
         the flag (such as for "Py_tp_methods"), or if this flag is
         present on the "parent" "Py_tp_slots" slot (if any).

         int slot

            Corresponds to "PySlot.sl_id".

         void *pfunc

            Corresponds to "PySlot.sl_ptr".
