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gh-114803: Mention that @dataclass should not be applied on enums (GH-114891)

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Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
Co-authored-by: Ethan Furman <ethan@stoneleaf.us>
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Nikita Sobolev 2024-02-04 00:55:38 +03:00 committed by GitHub
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Doc/howto/enum.rst
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@ -497,13 +497,30 @@ the :meth:`~Enum.__repr__` omits the inherited class' name. For example::
>>> Creature.DOG
<Creature.DOG: size='medium', legs=4>
Use the :func:`!dataclass` argument ``repr=False``
Use the :func:`~dataclasses.dataclass` argument ``repr=False``
to use the standard :func:`repr`.
.. versionchanged:: 3.12
Only the dataclass fields are shown in the value area, not the dataclass'
name.
.. note::
Adding :func:`~dataclasses.dataclass` decorator to :class:`Enum`
and its subclasses is not supported. It will not raise any errors,
but it will produce very strange results at runtime, such as members
being equal to each other::
>>> @dataclass # don't do this: it does not make any sense
... class Color(Enum):
... RED = 1
... BLUE = 2
...
>>> Color.RED is Color.BLUE
False
>>> Color.RED == Color.BLUE # problem is here: they should not be equal
True
Pickling
--------