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Title: [3.14] gh-85943: Fix BytesWarning in the struct format cache under -bb (GH-153627) by miss-islington · Pull Request #153835 · python/cpython · GitHub

Open Graph Title: [3.14] gh-85943: Fix BytesWarning in the struct format cache under -bb (GH-153627) by miss-islington · Pull Request #153835 · python/cpython

X Title: [3.14] gh-85943: Fix BytesWarning in the struct format cache under -bb (GH-153627) by miss-islington · Pull Request #153835 · python/cpython

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Open Graph Description: Normalize bytes format strings to str before using them as the cache key, so that equal str and bytes formats no longer collide and get compared. (cherry picked from commit 190d2ff) Co-authored-by:...

X Description: Normalize bytes format strings to str before using them as the cache key, so that equal str and bytes formats no longer collide and get compared. (cherry picked from commit 190d2ff) Co-authored-by:...

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[3.14] gh-85943: Fix BytesWarning in the struct format cache under -bb (GH-153627)https://github.com/python/cpython/pull/153835#top
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Jul 17, 2026https://github.com/python/cpython/pull/153835#issue-4909249475
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When using python -bb, struct.calcsize raises a warning when used with str argument after being used with bytes (might be a larger problem with dicts) #85943https://github.com/python/cpython/issues/85943
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: Fix BytesWarning in the struct format cache under -bb (https://github.com/python/cpython/pull/153835/commits/e3616a92854cb7cd70faf0962366199539d510c3
…https://github.com/python/cpython/pull/153627
e3616a9https://github.com/python/cpython/pull/153835/commits/e3616a92854cb7cd70faf0962366199539d510c3
…pythonGH-153627https://github.com/python/cpython/pull/153627
190d2ffhttps://github.com/miss-islington/cpython/commit/190d2ffbb969ad571fd12d4988b37519091194d5
When using python -bb, struct.calcsize raises a warning when used with str argument after being used with bytes (might be a larger problem with dicts) #85943 https://github.com/python/cpython/issues/85943
gh-85943: Fix BytesWarning in the struct format cache under -bb #153627 https://github.com/python/cpython/pull/153627
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struct: non-ASCII bytes format raises UnicodeEncodeError instead of struct.error on 3.13/3.14 #158172 https://github.com/python/cpython/issues/158172
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