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update argparse's doc of append action. (#92344)

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Hai Shi 2022-05-06 11:32:35 +08:00 • committed by GitHub
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Doc/library/argparse.rst
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@ -846,8 +846,10 @@ how the command-line arguments should be handled. The supplied actions are:
Namespace(foo=True, bar=False, baz=True)
* ``'append'`` - This stores a list, and appends each argument value to the
list. This is useful to allow an option to be specified multiple times.
Example usage::
list. It is useful to allow an option to be specified multiple times.
If the default value is non-empty, the default elements will be present
in the parsed value for the option, with any values from the
command line appended after those default values. Example usage::
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('--foo', action='append')