enum.Flag with a flag set to None raises an exception #115539
Description
Bug report
Bug description:
The following code snippet defines a Flag class denoting an unsupported flag with None.
from enum import Flag
class TestFlag(Flag):
O_NONE = 0
O_ONE = 1
O_TWO = 2
O_FOUR = 4
O_NOT_SUPPORTED = NoneWhile working fine on earlier Python versions, this code raises an exception on Python 3.11 and 3.12 without even instantiating the class.
The snippet above on Python 3.9:
Python 3.9.13 (tags/v3.9.13:6de2ca5, May 17 2022, 16:36:42) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from enum import Flag
>>> class TestFlag(Flag):
... O_NONE = 0
... O_ONE = 1
... O_TWO = 2
... O_FOUR = 4
... O_NOT_SUPPORTED = None
...
>>>Same snippet on Python 3.12:
Python 3.12.2 (tags/v3.12.2:6abddd9, Feb 6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from enum import Flag
>>> class TestFlag(Flag):
... O_NONE = 0
... O_ONE = 1
... O_TWO = 2
... O_FOUR = 4
... O_NOT_SUPPORTED = None
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.12_3.12.752.0_x64__qbz5n2kfra8p0\Lib\enum.py", line 593, in __new__
raise exc.with_traceback(tb)
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.12_3.12.752.0_x64__qbz5n2kfra8p0\Lib\enum.py", line 583, in __new__
enum_class = super().__new__(metacls, cls, bases, classdict, **kwds)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.12_3.12.752.0_x64__qbz5n2kfra8p0\Lib\enum.py", line 286, in __set_name__
enum_class._flag_mask_ |= value
TypeError: unsupported operand type(s) for |=: 'int' and 'NoneType'
>>>Works on:
- Python 3.8 (Windows and Linux)
- Python 3.9 (Windows and Linux)
Fails on:
- Python 3.11 (Windows, Linux not tested)
- Python 3.12 (Windows and Linux)
CPython versions tested on:
3.8, 3.9, 3.11, 3.12
Operating systems tested on:
Linux, Windows
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