New submission from Tom Brown <thecap...@gmail.com>:
The following script runs without error in 3.8.5 and raises an error in 3.8.6,
3.9.5 and 3.10.0b1.
Source:
```
import enum, pickle
class MyInt(int):
pass
# work-around: __reduce_ex__ = int.__reduce_ex__
class MyEnum(MyInt, enum.Enum):
A = 1
pickle.dumps(MyEnum.A)
```
Error (same in 3.8.6, 3.9.5 and 3.10.0b1):
```
Traceback (most recent call last):
File "/home/thecap/projects/covid-data-model/./enum-pickle.py", line 12, in
<module>
pickle.dumps(MyEnum.A)
File "/home/thecap/.pyenv/versions/3.10.0b1/lib/python3.10/enum.py", line 83,
in _break_on_call_reduce
raise TypeError('%r cannot be pickled' % self)
TypeError: MyEnum.A cannot be pickled
```
Like https://bugs.python.org/issue41889 this seems to be related to the fix for
https://bugs.python.org/issue39587 which changes member_type from int to MyInt.
A work-around is in the comment above.
----------
components: Library (Lib)
messages: 395300
nosy: Tom.Brown
priority: normal
severity: normal
status: open
title: enum with inherited type won't pickle
versions: Python 3.10, Python 3.8, Python 3.9
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44342>
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