Bug report

Bug description:

On python 3.10-3.12, the following snippet prints True, while on Python 3.13.0 it prints False:

from enum import Enum
from functools import partial


def a():
    pass


def b():
    pass


class MyCallables(Enum):
    A = a
    B = partial(b)


print(MyCallables.B in MyCallables)

This is because MyCallables.B is considered to be functools.partial(<function b at 0x756d7f0065c0>) on 3.13.0, when it used to be <MyCallables.B: functools.partial(<function b at 0x71f7cbc407c0>)> before.

This is something I've been using to allow function values in enums not to be considered methods, which I most likely got from this thread. In the example above, A would always be considered a method.

It seems like on 3.13.0, the "wrapper class" approach is the only one that works.

CPython versions tested on:

3.10, 3.11, 3.12, 3.13

Operating systems tested on:

Linux, Windows

Linked PRs

• [3.13] gh-125316: Fix using partial() as Enum member #125361