New submission from puddly <pudd...@gmail.com>:
The following code worked in 3.8.5 but does not in 3.8.6 due to the fix for
#39587:
```
import enum
class MyInt(int):
def __new__(cls, value):
return super().__new__(cls, value)
class HexMixin:
def __repr__(self):
return hex(self)
class MyIntEnum(HexMixin, MyInt, enum.Enum):
pass
class Foo(MyIntEnum):
TEST = 1
assert isinstance(Foo.TEST, MyInt)
assert repr(Foo.TEST) == "0x1"
```
In 3.8.6, the `Foo` enum itself fails to be created because `HexMixin` is now
considered the member type instead of `MyInt`:
```
Traceback (most recent call last):
File "enum_test.py", line 18, in <module>
class Foo(MyIntEnum):
File
"/usr/local/Cellar/python@3.8/3.8.6/Frameworks/Python.framework/Versions/3.8/lib/python3.8/enum.py",
line 215, in __new__
enum_member = __new__(enum_class)
TypeError: object.__new__(Foo) is not safe, use int.__new__()
```
----------
components: Library (Lib)
messages: 377692
nosy: barry, eli.bendersky, ethan.furman, puddly
priority: normal
severity: normal
status: open
title: enum: Mixin and int base class regression in 3.8.6
type: behavior
versions: Python 3.10, Python 3.8, Python 3.9
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41889>
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