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Title: gh-132762: Fix underallocation bug in dict.fromkeys() and expand test coverage by angela-tarantula · Pull Request #133627 · python/cpython · GitHub

Open Graph Title: gh-132762: Fix underallocation bug in dict.fromkeys() and expand test coverage by angela-tarantula · Pull Request #133627 · python/cpython

X Title: gh-132762: Fix underallocation bug in dict.fromkeys() and expand test coverage by angela-tarantula · Pull Request #133627 · python/cpython

Description: The Python programming language. Contribute to python/cpython development by creating an account on GitHub.

Open Graph Description: Closes #132762 Summary dict_set_fromkeys() was only sizing its new table by the size of the iterable input, ignoring any existing entries in the dictionary. This triggered an infinite loop in dictr...

X Description: Closes #132762 Summary dict_set_fromkeys() was only sizing its new table by the size of the iterable input, ignoring any existing entries in the dictionary. This triggered an infinite loop in dictr...

Opengraph URL: https://github.com/python/cpython/pull/133627

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og:image:altCloses #132762 Summary dict_set_fromkeys() was only sizing its new table by the size of the iterable input, ignoring any existing entries in the dictionary. This triggered an infinite loop in dictr...
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[3.13]https://github.com/python/cpython/commit/6ab4a4a32c284ddf2af765e011f59de70ff31eb6
gh-132762https://github.com/python/cpython/issues/132762
: Fix underallocation bug inhttps://github.com/python/cpython/commit/6ab4a4a32c284ddf2af765e011f59de70ff31eb6
dict.fromkeys()https://github.com/python/cpython/commit/6ab4a4a32c284ddf2af765e011f59de70ff31eb6
(https://github.com/python/cpython/commit/6ab4a4a32c284ddf2af765e011f59de70ff31eb6
gh-133627https://github.com/python/cpython/pull/133627
6ab4a4ahttps://github.com/python/cpython/commit/6ab4a4a32c284ddf2af765e011f59de70ff31eb6
https://github.com/python/cpython/pull/133627
gh-133686https://github.com/python/cpython/pull/133686
421ba58https://github.com/python/cpython/commit/421ba589d02b53131f793889d221ef3b1f1410a4
Pranjal095https://github.com/Pranjal095
Jul 12, 2025 https://github.com/python/cpython/pull/133627#ref-commit-3bac685
https://github.com/angela-tarantula
https://github.com/Pranjal095
pythongh-132762https://github.com/python/cpython/issues/132762
: Fix underallocation bug inhttps://github.com/Pranjal095/cpython/commit/3bac6852b78ff0ed0eab62cc243d9cf8427d1aa7
dict.fromkeys()https://github.com/Pranjal095/cpython/commit/3bac6852b78ff0ed0eab62cc243d9cf8427d1aa7
(https://github.com/Pranjal095/cpython/commit/3bac6852b78ff0ed0eab62cc243d9cf8427d1aa7
pythong…https://github.com/python/cpython/pull/133627
3bac685https://github.com/Pranjal095/cpython/commit/3bac6852b78ff0ed0eab62cc243d9cf8427d1aa7
…h-133627https://github.com/python/cpython/pull/133627
taegyunkimhttps://github.com/taegyunkim
Aug 4, 2025 https://github.com/python/cpython/pull/133627#ref-commit-3758179
https://github.com/angela-tarantula
https://github.com/taegyunkim
pythongh-132762https://github.com/python/cpython/issues/132762
: Fix underallocation bug inhttps://github.com/taegyunkim/cpython/commit/375817974b9738239735212dc9fa626a145baae8
dict.fromkeys()https://github.com/taegyunkim/cpython/commit/375817974b9738239735212dc9fa626a145baae8
(https://github.com/taegyunkim/cpython/commit/375817974b9738239735212dc9fa626a145baae8
pythong…https://github.com/python/cpython/pull/133627
3758179https://github.com/taegyunkim/cpython/commit/375817974b9738239735212dc9fa626a145baae8
…h-133627https://github.com/python/cpython/pull/133627
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dict_set_fromkeys() calculates size of dictionary improperly https://github.com/python/cpython/issues/132762
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