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ctypes: Remove misleading comment about tuple support in _as_parameter_ and add regression test #142174

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ctypes: Remove misleading comment about tuple support in _as_parameter_ and add regression test#142174
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docsDocumentation in the Doc dirDocumentation in the Doc dirextension-modulesC modules in the Modules dirC modules in the Modules dirtopic-ctypes
@CodeMaverick-143

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@CodeMaverick-143
CodeMaverick-143
opened on Dec 2, 2025
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Bug report

Bug description:

Modules/_ctypes/callproc.c contained a comment (marked XXX) stating that as_parameter
allows constructing arbitrary tuples and passing them, describing this convention as "dangerous".
Analysis confirms that
ctypes
does not support returning tuples from as_parameter for default conversions. Attempting to do so raises a "TypeError" (wrapped in an ArgumentError), meaning the described security risk does not exist in the current codebase.

CPython versions tested on:

3.13

Operating systems tested on:

macOS

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    docsDocumentation in the Doc dirDocumentation in the Doc dirextension-modulesC modules in the Modules dirC modules in the Modules dirtopic-ctypes

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