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1. cdce8p

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Jul 20, 2023
2. ethanfurman

   self-assigned this

   on Jul 20, 2023
3. ethanfurman commented on Jul 20, 2023

   

   ethanfurman

   on Jul 20, 2023

   Member

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   Thank you for the report!

   What is your use-case for this behavior? Typically, an enum with no members is meant to be subclassed.

   👍React with 👍1Reacted by Kirill Podoprigora
4. AlexWaygood

   added

   stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

   3.12only security fixesonly security fixes

   3.13only security fixesonly security fixes

   on Jul 20, 2023
5. cdce8p commented on Jul 20, 2023

   

   cdce8p

   on Jul 20, 2023

   ContributorAuthor

   More actions

   What is your use-case for this behavior? Typically, an enum with no members is meant to be subclassed.

   Tbh I stumbled upon this while testing a third party library: https://github.com/zigpy/zigpy
   As best as I can tell, they do also subclass it, but bitmap.from_bytes in that case is used in a deserialization routine from a binary struct.

   I could post a longer example, just not sure it's all that useful, that's why I condensed it initially.
6. ethanfurman commented on Jul 21, 2023

   

   ethanfurman

   on Jul 21, 2023

   Member

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   Please open an issue with zigpy and reference this one. They should be able to confirm if this is a problem in practice.

   👍React with 👍1Reacted by Marc Mueller
7. AlexWaygood

   added this to enum issueson Jul 21, 2023
8. puddly commented on Jul 26, 2023

   

   puddly

   on Jul 26, 2023

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   While this new 3.12 behavior is backwards-incompatible with Python 3.11, we've resolved this problem by avoiding the functional API by replacing the enum metaclass (zigpy/zigpy#1236):

   import enum
   
   
   class AlwaysCreateEnumType(enum.EnumMeta):
       """Enum metaclass that skips the functional creation API."""
   
       def __call__(cls, value, names=None, *values) -> type[enum.Enum]:  # type: ignore
           return cls.__new__(cls, value)  # type: ignore
   
   
   class bitmap8(
       int,
       enum.ReprEnum,
       enum.Flag,
       boundary=enum.KEEP,
       metaclass=AlwaysCreateEnumType,
   ):
       pass
   
   bitmap8(0)  # works with 3.11 and 3.12

   You can consider this issue resolved if no other projects rely on using the enum classes this way.
9. ethanfurman

   closed this as not plannedon Jul 27, 2023
10. github-project-automation

    moved this to Done in enum issueson Jul 27, 2023