gh-145688: Handle typing_extensions.Protocol in _get_protocol_attrs

Address review feedback: also skip bases from typing_extensions module
so the backported Protocol class is treated the same as typing.Protocol.
Simplify NEWS entry to focus on user-visible behavior.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mvanhorn

Lib/typing.py

@@ -1884,7 +1884,7 @@ def _get_protocol_attrs(cls):
     """
     attrs = set()
     for base in cls.__mro__[:-1]:  # without object
-        if base.__name__ in {'Protocol', 'Generic'} and base.__module__ == 'typing':
+        if base.__name__ in {'Protocol', 'Generic'} and base.__module__ in {'typing', 'typing_extensions'}:
             continue
         try:
             annotations = base.__annotations__

Misc/NEWS.d/next/Library/2026-03-09-00-00-00.gh-issue-145688.protocol-name.rst

@@ -1,5 +1,2 @@
-Fixed :func:`typing.get_protocol_members` and :attr:`~typing.Protocol.__protocol_attrs__`
-returning empty results for Protocol subclasses named ``"Protocol"`` or ``"Generic"``.
-The check in :func:`_get_protocol_attrs` now uses identity comparison instead of
-name-based comparison to skip the base :class:`typing.Protocol` and
-:class:`typing.Generic` classes.
+Fixed :func:`typing.get_protocol_members` returning empty results for
+:class:`typing.Protocol` subclasses named ``"Protocol"`` or ``"Generic"``.