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[3.14] gh-132762: Fix underallocation bug in`dict.fromkeys()`(gh-133627)#133685

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Merged

colesbury merged 1 commit intopython:3.14frommiss-islington:backport-421ba58-3.14

May 8, 2025

Merged

[3.14] gh-132762: Fix underallocation bug in`dict.fromkeys()`(gh-133627)#133685

colesbury merged 1 commit intopython:3.14frommiss-islington:backport-421ba58-3.14

May 8, 2025

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miss-islington commentedMay 8, 2025•
edited by bedevere-appbot
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The functiondict_set_fromkeys() adds elements of a set to an existing
dictionary. The size of the expanded dictionary was estimated with
PySet_GET_SIZE(iterable), which did not take into account the size of the
existing dictionary.
(cherry picked from commit421ba58)

Co-authored-by: Angela Liss59097311+angela-tarantula@users.noreply.github.com

Issue:dict_set_fromkeys() calculates size of dictionary improperly #132762

pythongh-132762: Fix underallocation bug indict.fromkeys()(pythong…

460aeda

…h-133627)The function `dict_set_fromkeys()` adds elements of a set to an existingdictionary. The size of the expanded dictionary was estimated with`PySet_GET_SIZE(iterable)`, which did not take into account the size of theexisting dictionary.(cherry picked from commit421ba58)Co-authored-by: Angela Liss <59097311+angela-tarantula@users.noreply.github.com>