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[3.12] gh-105535 Document potential performance trap during enum creation (GH-107119) by miss-islington · Pull Request #116511 · python/cpython · GitHub

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[3.12] gh-105535 Document potential performance trap during enum creation (GH-107119) #116511

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ethanfurman merged 1 commit into from
Mar 9, 2024
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[3.12] gh-105535 Document potential performance trap during enum creation (GH-107119) #116511

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7 changes: 7 additions & 0 deletions Doc/library/enum.rst
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Expand Up @@ -269,13 +269,20 @@ Data Types
>>> Color.RED.value
1

Value of the member, can be set in :meth:`~object.__new__`.

.. note:: Enum member values

Member values can be anything: :class:`int`, :class:`str`, etc. If
the exact value is unimportant you may use :class:`auto` instances and an
appropriate value will be chosen for you. See :class:`auto` for the
details.

While mutable/unhashable values, such as :class:`dict`, :class:`list` or
a mutable :class:`~dataclasses.dataclass`, can be used, they will have a
quadratic performance impact during creation relative to the
total number of mutable/unhashable values in the enum.

.. attribute:: Enum._name_

Name of the member.
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