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Title: gh-145743: Fix inconsistency after calling Struct.__init__() with invalid format by serhiy-storchaka · Pull Request #145744 · python/cpython · GitHub

Open Graph Title: gh-145743: Fix inconsistency after calling Struct.__init__() with invalid format by serhiy-storchaka · Pull Request #145744 · python/cpython

X Title: gh-145743: Fix inconsistency after calling Struct.__init__() with invalid format by serhiy-storchaka · Pull Request #145744 · python/cpython

Description: Only set the format attribute after successful (re-)initialization. Issue: gh-145743

Open Graph Description: Only set the format attribute after successful (re-)initialization. Issue: gh-145743

X Description: Only set the format attribute after successful (re-)initialization. Issue: gh-145743

Opengraph URL: https://github.com/python/cpython/pull/145744

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7336aaa gh-145743: Fix inconsistancy after calling Struct.__init__() with inv… serhiy-storchaka Mar 10, 2026 https://github.com/python/cpython/pull/145744/commits/7336aaad1a7458630089c4aecc8806b15ec64b23
a23f9bb Update Modules/_struct.c serhiy-storchaka Mar 10, 2026 https://github.com/python/cpython/pull/145744/commits/a23f9bb13d3b70d4db72f4a64d6de2cc7b7c5b3f
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