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gh-54732: Make argparse error caused by empty rows in option files explicit #136795

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Merged
merged 6 commits into from
Jul 19, 2025
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gh-54732: Make argparse error caused by empty rows in option files explicit #136795

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1cfa51b
gh-54732: Make argparse error caused by empty rows explicit
jdunter Jul 19, 2025
5fe6fc4
Merge branch 'main' into doc_argparse_empty_rows
jdunter Jul 19, 2025
4808daa
Merge branch 'python:main' into doc_argparse_empty_rows
jdunter Jul 19, 2025
d2f76e4
gh-54732: Address suggestions from PR Discussion.
jdunter Jul 19, 2025
ea51887
gh-54732: Address suggestions from real life PR Discussion.
jdunter Jul 19, 2025
b74413d
Update Doc/library/argparse.rst
AA-Turner Jul 19, 2025
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6 changes: 6 additions & 0 deletions Doc/library/argparse.rst
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Expand Up @@ -440,6 +440,12 @@ were in the same place as the original file referencing argument on the command
line. So in the example above, the expression ``['-f', 'foo', '@args.txt']``
is considered equivalent to the expression ``['-f', 'foo', '-f', 'bar']``.

.. note::

Empty lines are treated as empty strings (''), which are allowed as values but not
as arguments. Empty lines as arguments will result in an “unrecognized arguments”
error.

:class:`ArgumentParser` uses :term:`filesystem encoding and error handler`
to read the file containing arguments.

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