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gh-100458: Clarify Enum.__format__() change of mixed-in types in the whatsnew/3.11.rst by anze3db · Pull Request #100387 · python/cpython · GitHub

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gh-100458: Clarify Enum.__format__() change of mixed-in types in the whatsnew/3.11.rst #100387

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Merged
ethanfurman merged 7 commits into from
May 1, 2023
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gh-100458: Clarify Enum.__format__() change of mixed-in types in the whatsnew/3.11.rst #100387

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e51f55c
Clarify Enum.__format__() change of mixed-in types
anze3db Dec 21, 2022
4ccc0fe
Point users to StrEnum or IntEnum for old formatting behavior
anze3db Dec 27, 2022
3311e3d
Merge branch 'main' into main
anze3db Dec 27, 2022
0d265a0
Split into multiple ines
anze3db Dec 27, 2022
5f30054
Fix small typo
anze3db Dec 27, 2022
bee67ca
Address PR feedback
anze3db Mar 22, 2023
6aed4ca
update prose
ethanfurman Apr 18, 2023
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18 changes: 5 additions & 13 deletions Doc/whatsnew/3.11.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -667,19 +667,11 @@ enum
for :meth:`~object.__str__` and :meth:`~object.__format__`
(used by :func:`str`, :func:`format` and :term:`f-string`\s).

* Changed :class:`~enum.IntEnum`, :class:`~enum.IntFlag` and :class:`~enum.StrEnum`
to now inherit from :class:`~enum.ReprEnum`,
so their :func:`str` output now matches :func:`format`
(both ``str(AnIntEnum.ONE)`` and ``format(AnIntEnum.ONE)`` return ``'1'``,
whereas before ``str(AnIntEnum.ONE)`` returned ``'AnIntEnum.ONE'``.

* Changed :meth:`Enum.__format__() <enum.Enum.__format__>`
(the default for :func:`format`, :meth:`str.format` and :term:`f-string`\s)
of enums with mixed-in types (e.g. :class:`int`, :class:`str`)
to also include the class name in the output, not just the member's key.
This matches the existing behavior of :meth:`enum.Enum.__str__`,
returning e.g. ``'AnEnum.MEMBER'`` for an enum ``AnEnum(str, Enum)``
instead of just ``'MEMBER'``.
* Changed :meth:`Enum.__format__() <enum.Enum.__format__>` (the default for
:func:`format`, :meth:`str.format` and :term:`f-string`\s) to always produce
the same result as :meth:`Enum.__str__()`: for enums inheriting from
:class:`~enum.ReprEnum` it will be the member's value; for all other enums
it will be the enum and member name (e.g. ``Color.RED``).

* Added a new *boundary* class parameter to :class:`~enum.Flag` enums
and the :class:`~enum.FlagBoundary` enum with its options,
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