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gh-143674: document complex representation using f/d formats in struct #143879

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test: checking github-wsl connection
darshan2456 Dec 6, 2025
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gh-143674: document complex representation using f/d formats in struct
darshan2456 Jan 15, 2026
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Merge branch 'main' into test_branch
skirpichev Jan 16, 2026
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4 changes: 4 additions & 0 deletions Doc/library/struct.rst
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Expand Up @@ -280,6 +280,10 @@ platform-dependent.
.. versionchanged:: 3.14
Added support for the ``'F'`` and ``'D'`` formats.

Complex numbers may also be represented using two consecutive floating-point
format characters. In this case, the real part is stored first, followed by
the imaginary part. The format characters ``f`` and ``d`` determine the type
used for each component.
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@skirpichev skirpichev Jan 16, 2026 •
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The are note (10) right below. Much more precise and clear, IMO. What means "may also be"?

Are you used LLM to generate PR? It looks you haven't read the documentation by yourself. Please see this:

Maintainers may close issues and PRs that are not useful or productive, including those that are fully generated by AI. If a contributor repeatedly opens unproductive issues or PRs, they may be blocked.


Notes:

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4 changes: 3 additions & 1 deletion Modules/_struct.c
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Expand Up @@ -2696,7 +2696,9 @@ these can be preceded by a decimal repeat count:\n\
x: pad byte (no data); c:char; b:signed byte; B:unsigned byte;\n\
?: _Bool (requires C99; if not available, char is used instead)\n\
h:short; H:unsigned short; i:int; I:unsigned int;\n\
l:long; L:unsigned long; f:float; d:double; e:half-float.\n\
l:long; L:unsigned long; f:float; d:double; e:half-float.\n\
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@skirpichev skirpichev Jan 16, 2026

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That change is unrelated.

For complex numbers, the real and imaginary parts are represented by two\n\
consecutive values of the specified floating-point type.\n\
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@skirpichev skirpichev Jan 16, 2026

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Misleading. No one "specified" a "floating-point type". 'F' and 'D' formats specify a complex C types.

BTW, there are already opened PR (#143675). Next time please check the issue thread and comment why you would like to open an extra PR.

I think it's better to close this. But CC @vstinner

Special cases (preceding decimal count indicates length):\n\
s:string (array of char); p: pascal string (with count byte).\n\
Special cases (only available in native format):\n\
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Empty file added test_PAT.txt
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