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gh-98250: Improve documentation about change to Enum.__format__ #98261

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gh-98250: Improve documentation about change to Enum.__format__ #98261

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gh-98250: Improve documentation about change to Enum.__format__
mdboom Oct 14, 2022
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Add note about `__format__` used in f-strings
mdboom Oct 17, 2022
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5 changes: 5 additions & 0 deletions Doc/whatsnew/3.11.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -624,6 +624,11 @@ enum

* ``EnumMeta`` renamed to ``EnumType`` (``EnumMeta`` kept as alias).

* The output of ``Enum.__format__`` has changed to include both the enum name
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Might be worth adding explicitly that this affects enums included in f-strings, since that may not be obvious to a lot of readers.

and the member name (e.g. ``Enum.MEMBER``). In 3.10 and earlier it only
included the member name (e.g. ``MEMBER``). To restore the new behavior,
inherit from a subclass of ``ReprEnum``, such as ``IntEnum`` or ``StrEnum``.

* ``StrEnum`` added -- enum members are and must be strings.

* ``ReprEnum`` added -- causes only the ``__repr__`` to be modified, not the
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