New submission from Mariusz Felisiak <felisiak.mari...@gmail.com>:
We noticed a behavior change in Python3.10.0a4 (it works properly in
Python3.10.0a3) when running Django's test suite[1]. Subclassing `enum.Enum`
with `ipaddress.IPv4Network/IPv6Network` raises `TypeError`, e.g.
>>> import enum
>>> import ipaddress
>>> class NewEnum(ipaddress.IPv4Address, enum.Enum):
... pass
...
>>> class NewEnum(ipaddress.IPv4Network, enum.Enum):
... pass
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.10/enum.py", line 239, in __new__
enum_class.__bases__ = enum_class.__bases__[1:] #or (object, )
File "/usr/local/lib/python3.10/enum.py", line 483, in __setattr__
super().__setattr__(name, value)
TypeError: __bases__ assignment: 'IPv4Network' object layout differs from
'_NoInitSubclass'
It still works for `ipaddress.IPv4Address/IPv6Address`.
[1]
https://github.com/django/django/blob/102d92fc09849e1a9004dd3f9a14a0ea9ca392cd/tests/model_enums/tests.py#L225-L235
----------
components: Library (Lib)
messages: 384563
nosy: barry, eli.bendersky, ethan.furman, felixxm
priority: normal
severity: normal
status: open
title: Subclassing Enum with ipaddress.IPv4Network/IPv6Network raises TypeError.
type: crash
versions: Python 3.10
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42851>
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