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Issue #25314: store_true and store_false also create appropriate defaults.

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This commit is contained in:
Raymond Hettinger 2011-11-20 11:05:23 -08:00
parent f6b1d66a3c
commit f9cddccf8c
1 changed files with 6 additions and 4 deletions
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Doc/library/argparse.rst
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@ -729,15 +729,17 @@ how the command-line arguments should be handled. The supplied actions are:
>>> parser.parse_args('--foo'.split()) >>> parser.parse_args('--foo'.split())
Namespace(foo=42) Namespace(foo=42)
* ``'store_true'`` and ``'store_false'`` - These store the values ``True`` and * ``'store_true'`` and ``'store_false'`` - These are special cases of
``False`` respectively. These are special cases of ``'store_const'``. For ``'store_const'`` used for storing the values ``True`` and ``False``
example:: respectively. In addition, they create default values of ``False`` and
``True`` respectively. For example::
>>> parser = argparse.ArgumentParser() >>> parser = argparse.ArgumentParser()
>>> parser.add_argument('--foo', action='store_true') >>> parser.add_argument('--foo', action='store_true')
>>> parser.add_argument('--bar', action='store_false') >>> parser.add_argument('--bar', action='store_false')
>>> parser.add_argument('--baz', action='store_false')
>>> parser.parse_args('--foo --bar'.split()) >>> parser.parse_args('--foo --bar'.split())
Namespace(bar=False, foo=True) Namespace(foo=True, bar=False, baz=True)
* ``'append'`` - This stores a list, and appends each argument value to the * ``'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. list. This is useful to allow an option to be specified multiple times.