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formatfloat wrong return in unicode_format.c #151845

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formatfloat wrong return in unicode_format.c#151845
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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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@aisk
aisk
opened on Jun 21, 2026

Bug report

Bug description:

Original gist: https://gist.github.com/devdanzin/577421b083bad6802aa391b909d1a725

formatfloat (line 163): Returns 0 (success) when _PyUnicode_FromASCII fails. Caller has safety net, but violates return-value contract.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

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  1. aisk
    added
    type-bugAn unexpected behavior, bug, or error
    on Jun 21, 2026
  2. aisk
    added a parent issue on Jun 21, 2026
  3. aisk
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on Jun 21, 2026
  4. sobolevn
    added 2 commits that reference this issue on Jun 21, 2026

    gh-151845: Fix formatfloat() return-value contract in unicode_format.c (

    c2661e6

    [3.15] gh-151845: Fix formatfloat() return-value contract in unicode_…

    f5119a5
  5. StanFromIreland
    closed this as completedon Jun 21, 2026
  6. pyctrl
    added a commit that references this issue on Jul 5, 2026

    pythongh-151845: Fix formatfloat() return-value contract in unicode_f…

    3eb78f4
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    interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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