# Objetos para indicaciones de tipado

Se proporcionan varios tipos incorporados para indicaciones de tipado. Actualmente existen dos tipos – GenericAlias y Union. Solo `GenericAlias` es expuesto a C.

PyObject *Py_GenericAlias(PyObject *origin, PyObject *args)
  Part of the Stable ABI since version 3.9.

  Create a GenericAlias object. Equivalent to calling the Python class `types.GenericAlias`. The origin and args arguments set the `GenericAlias`“s `__origin__` and `__args__` attributes respectively. origin should be a PyTypeObject*, and args can be a PyTupleObject* or any `PyObject*`. If args passed is not a tuple, a 1-tuple is automatically constructed and `__args__` is set to `(args,)`. Minimal checking is done for the arguments, so the function will succeed even if origin is not a type. The `GenericAlias`“s `__parameters__` attribute is constructed lazily from `__args__`. On failure, an exception is raised and `NULL` is returned.

  Aquí hay un ejemplo sobre cómo hacer un tipo de extensión genérica:

      ...
      static PyMethodDef my_obj_methods[] = {
          // Other methods.
          ...
          {"__class_getitem__", Py_GenericAlias, METH_O|METH_CLASS, "See PEP 585"}
          ...
      }

  Ver también

  The data model method `__class_getitem__()`.

  Added in version 3.9.

PyTypeObject Py_GenericAliasType
  Part of the Stable ABI since version 3.9.

  El tipo en C del objeto retornado por `Py_GenericAlias()`. Equivalente a `types.GenericAlias` en Python.

  Added in version 3.9.