8000 bpo-44392: Add Py_GenericAlias to C API docs (GH-26724) · python/cpython@84ce737 · GitHub
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bpo-44392: Add Py_GenericAlias to C API docs (GH-26724)
Also fix stable ABI type definitions (cherry picked from commit 6773c3e) Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
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‎Doc/c-api/concrete.rst

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coro.rst
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contextvars.rst
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datetime.rst
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typehints.rst

‎Doc/c-api/typehints.rst

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.. highlight:: c
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.. _typehintobjects:
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Objects for Type Hinting
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------------------------
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Various built-in types for type hinting are provided. Currently,
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two types exist -- :ref:`GenericAlias <types-genericalias>` and
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:ref:`Union <types-union>`. Only ``GenericAlias`` is exposed to C.
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.. c:function:: PyObject* Py_GenericAlias(PyObject *origin, PyObject *args)
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Create a :ref:`GenericAlias <types-genericalias>` object.
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Equivalent to calling the Python class
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:class:`types.GenericAlias`. The *origin* and *args* arguments set the
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``GenericAlias``\ 's ``__origin__`` and ``__args__`` attributes respectively.
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*origin* should be a :c:type:`PyTypeObject*`, and *args* can be a
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:c:type:`PyTupleObject*` or any ``PyObject*``. If *args* passed is
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not a tuple, a 1-tuple is automatically constructed and ``__args__`` is set
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to ``(args,)``.
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Minimal checking is done for the arguments, so the function will succeed even
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if *origin* is not a type.
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The ``GenericAlias``\ 's ``__parameters__`` attribute is constructed lazily
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from ``__args__``. On failure, an exception is raised and ``NULL`` is
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returned.
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Here's an example of how to make an extension type generic::
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...
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static PyMethodDef my_obj_methods[] = {
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// Other methods.
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...
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{"__class_getitem__", (PyCFunction)Py_GenericAlias, METH_O|METH_CLASS, "See PEP 585"}
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...
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}
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.. seealso:: The data model method :meth:`__class_getitem__`.
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.. versionadded:: 3.9
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.. c:var:: PyTypeObject Py_GenericAliasType
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The C type of the object returned by :c:func:`Py_GenericAlias`. Equivalent to
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:class:`types.GenericAlias` in Python.
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.. versionadded:: 3.9

‎Doc/data/stable_abi.dat

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function,Py_Finalize,3.2,
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function,Py_FinalizeEx,3.6,
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function,Py_GenericAlias,3.9,
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function,Py_GenericAliasType,3.9,
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var,Py_GenericAliasType,3.9,
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function,Py_GetBuildInfo,3.2,
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function,Py_GetCompiler,3.2,
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function,Py_GetCopyright,3.2,

‎Misc/NEWS.d/next/Documentation/2021-06-16-18-09-49.bpo-44392.6RF1Sc.rst

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Added a new section in the C API documentation for types used in type
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hinting. Documented ``Py_GenericAlias`` and ``Py_GenericAliasType``.

‎Misc/stable_abi.txt

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added 3.9
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function Py_GenericAlias
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added 3.9
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function Py_GenericAliasType
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data Py_GenericAliasType
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added 3.9
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function PyCMethod_New
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added 3.9 # Windows: 3.10 & 3.9.2 -- https://bugs.python.org/issue43155

‎PC/python3dll.c

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EXPORT_FUNC(Py_Finalize)
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EXPORT_FUNC(Py_FinalizeEx)
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EXPORT_FUNC(Py_GenericAlias)
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EXPORT_FUNC(Py_GenericAliasType)
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EXPORT_FUNC(Py_GetArgcArgv)
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EXPORT_FUNC(Py_GetBuildInfo)
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EXPORT_FUNC(Py_GetCompiler)
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EXPORT_DATA(_PyWeakref_RefType)
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EXPORT_DATA(Py_FileSystemDefaultEncodeErrors)
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EXPORT_DATA(Py_FileSystemDefaultEncoding)
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EXPORT_DATA(Py_GenericAliasType)
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EXPORT_DATA(Py_HasFileSystemDefaultEncoding)
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EXPORT_DATA(Py_UTF8Mode)
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EXPORT_DATA(PyBaseObject_Type)

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