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[3.13] gh-85935: Explicitly document the case nargs=0 in argparse (GH-125302) (GH-125357)

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(cherry picked from commit 07c2d15977)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2024-10-12 15:02:26 +02:00 • committed by GitHub
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@ -728,6 +728,9 @@ how the command-line arguments should be handled. The supplied actions are:
.. versionadded:: 3.8
Only actions that consume command-line arguments (e.g. ``'store'``,
``'append'`` or ``'extend'``) can be used with positional arguments.
You may also specify an arbitrary action by passing an Action subclass or
other object that implements the same interface. The ``BooleanOptionalAction``
is available in ``argparse`` and adds support for boolean actions such as
@ -855,6 +858,8 @@ See also :ref:`specifying-ambiguous-arguments`. The supported values are:
If the ``nargs`` keyword argument is not provided, the number of arguments consumed
is determined by the action_. Generally this means a single command-line argument
will be consumed and a single item (not a list) will be produced.
Actions that do not consume command-line arguments (e.g.
``'store_const'``) set ``nargs=0``.
.. _const: