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[3.15] GH-54732: Tweak wording around empty lines in argument files (GH-150980) by miss-islington · Pull Request #151165 · python/cpython · GitHub

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[3.15] GH-54732: Tweak wording around empty lines in argument files (GH-150980) #151165

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savannahostrowski merged 1 commit into from
Jun 9, 2026
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[3.15] GH-54732: Tweak wording around empty lines in argument files (GH-150980) #151165

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8 changes: 5 additions & 3 deletions Doc/library/argparse.rst
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Expand Up @@ -442,9 +442,8 @@ 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 that are read as arguments will result in an
"unrecognized arguments" error.
Each line is treated as a single argument, so an empty line is read as an
empty string (``''``).

:class:`ArgumentParser` uses :term:`filesystem encoding and error handler`
to read the file containing arguments.
Expand Down Expand Up @@ -2232,6 +2231,9 @@ Customizing file parsing
def convert_arg_line_to_args(self, arg_line):
return arg_line.split()

Note that with this override an argument can no longer contain spaces, since
each space-separated word becomes a separate argument.


Exiting methods
^^^^^^^^^^^^^^^
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