Enum with NamedTuples which copy each other break

[rmtmckenzie]

Bug report

I'm using a 3rd-party library as part of my CI process, and since github updated their mac image to include python 3.11.1 it is breaking. It worked fine in 3.11.0.

The 3rd-party tool is in pip; codemagic-cli-tools. When importing, it fails when declaring an enum. This can be reproduced by running from codemagic.tools import Keychain after installing version 0.36.4.

As near as I can tell, a class inheriting NamedTuple is being interpreted as a tuple when declared as part of an enum. When declared elsewhere it doesn't seem to exhibit this behaviour.

I've managed to reproduce this with a much more minimal example; when you run the following:

import enum
from typing import NamedTuple

class NT(NamedTuple):
  s: str

nt0 = NT(s="s0")
nt0._replace(s="other") # this is valid

class E(enum.Enum):
  nt1 = NT(s="s1")
  nt2 = nt1._replace(s="s2")

it fails with the error AttributeError: 'tuple' object has no attribute '_replace' in python 3.11.1 but not python 3.11.0.

If it this is in fact just incorrect python, fair enough - I'll open a bug against the codemagic-cli-tools library, but this does seem like unexpected behaviour to me.

Your environment

Python 3.11.1; I reproduced this in the docker image python:3.11.1. In the docker image python:3.11.0 the code above produces no errors.

• CPython versions tested on: 3.11.1, 3.11.0
• Operating system and architecture: macos x64, but run in docker

[AlexWaygood]

Duplicate of #100098; it'll be fixed in 3.11.2; see #100098 for workarounds on 3.11.1

(Cc. @ethanfurman for enum stuff)