Protocol named "Protocol" or "Generic" has no members.

Bug report

Bug description:

If a protocol is named Protocol or Generic then it will ignore any defined members.

when you get lazy with naming in your unit tests this makes for quite a head scratcher...

Minimal Reproduction

import typing


class Protocol(typing.Protocol):
    a: int


members = typing.get_protocol_members(Protocol)

assert members == {"a"}, f"Expected members to be {{'a'}}, got {members}"

Output:

Traceback (most recent call last):
  File ".../test_protocol.py", line 10, in <module>
    assert members == {"a"}, f"Expected members to be {{'a'}}, got {members}"
           ^^^^^^^^^^^^^^^^
AssertionError: Expected members to be {'a'}, got frozenset()

Expected Output:

Nothing, script should succeed without error.

Investigation

The problem appears to stem from the _get_protocol_attrs function used by _ProtocolMeta which is defined as follows:

https://github.com/python/cpython/blob/171133aa84cd2fa8738bdbb0c76435645810e8d3/Lib/typing.py#L1879-L1899

The if statement on line 1887 is too loose in what it matches.

Possibile Fix

The check for base needs to be more specific, either using the instance itself:

if base in {Protocol, Generic}:
    continue

or checking the module too, in order to ensure its the correct class being excluded:

if base.__name__ in {'Protocol', 'Generic'} and base.__module__ == 'typing':
    continue

CPython versions tested on:

3.14

Operating systems tested on:

macOS

Linked PRs

• gh-145724

Beginne in Lib/typing.py bei _get_protocol_attrs, der im Bericht identifizierten Funktion, und führe die bereitgestellte minimale Reproduktion mit Python 3.14 aus. Fertig ist die Aufgabe, wenn eine benutzerdefinierte Klasse namens Protocol oder Generic ihre deklarierten Protokollmitglieder über typing.get_protocol_members offenlegt; prüfe vor dem Beginn gh-145724, da der Issue einen bestehenden Pull Request verlinkt.