型ヒントのためのオブジェクト
****************************

Various built-in types for type hinting are provided. Only
GenericAlias is exposed to C.

PyObject* Py_GenericAlias(PyObject *origin, PyObject *args)

   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.

   以下は拡張の型をジェネリックにする例です。

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

   参考: データモデルメソッド "__class_getitem__()" 。

   バージョン 3.9 で追加.

PyTypeObject Py_GenericAliasType

   "Py_GenericAlias()" により返されるCの型オブジェクトです。Pythonの
   "types.GenericAlias" と同等です。

   バージョン 3.9 で追加.
