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@ -739,7 +739,7 @@ how the command-line arguments should be handled. The supported actions are:
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* ``'version'`` - This expects a ``version=`` keyword argument in the
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:meth:`~ArgumentParser.add_argument` call, and prints version information
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and exits when invoked.
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and exits when invoked::
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>>> import argparse
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>>> parser = argparse.ArgumentParser(prog='PROG')
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@ -791,8 +791,8 @@ single action to be taken. The ``nargs`` keyword argument associates a
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different number of command-line arguments with a single action. The supported
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values are:
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* ``N`` (an integer). ``N`` arguments from the command line will be gathered together into a
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list. For example::
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* ``N`` (an integer). ``N`` arguments from the command line will be gathered
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together into a list. For example::
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>>> parser = argparse.ArgumentParser()
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>>> parser.add_argument('--foo', nargs=2)
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@ -861,7 +861,7 @@ values are:
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* ``argparse.REMAINDER``. All the remaining command-line arguments are gathered
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into a list. This is commonly useful for command line utilities that dispatch
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to other command line utilities.
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to other command line utilities::
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>>> parser = argparse.ArgumentParser(prog='PROG')
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>>> parser.add_argument('--foo')
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@ -884,7 +884,8 @@ the various :class:`ArgumentParser` actions. The two most common uses of it are
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* When :meth:`~ArgumentParser.add_argument` is called with
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``action='store_const'`` or ``action='append_const'``. These actions add the
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``const`` value to one of the attributes of the object returned by :meth:`~ArgumentParser.parse_args`. See the action_ description for examples.
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``const`` value to one of the attributes of the object returned by
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:meth:`~ArgumentParser.parse_args`. See the action_ description for examples.
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* When :meth:`~ArgumentParser.add_argument` is called with option strings
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(like ``-f`` or ``--foo``) and ``nargs='?'``. This creates an optional
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@ -1595,21 +1596,21 @@ FileType objects
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The :class:`FileType` factory creates objects that can be passed to the type
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argument of :meth:`ArgumentParser.add_argument`. Arguments that have
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:class:`FileType` objects as their type will open command-line arguments as files
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with the requested modes and buffer sizes:
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with the requested modes and buffer sizes::
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>>> parser = argparse.ArgumentParser()
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>>> parser.add_argument('--output', type=argparse.FileType('wb', 0))
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>>> parser.parse_args(['--output', 'out'])
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Namespace(output=<_io.BufferedWriter name='out'>)
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>>> parser = argparse.ArgumentParser()
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>>> parser.add_argument('--output', type=argparse.FileType('wb', 0))
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>>> parser.parse_args(['--output', 'out'])
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Namespace(output=<_io.BufferedWriter name='out'>)
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FileType objects understand the pseudo-argument ``'-'`` and automatically
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convert this into ``sys.stdin`` for readable :class:`FileType` objects and
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``sys.stdout`` for writable :class:`FileType` objects:
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``sys.stdout`` for writable :class:`FileType` objects::
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>>> parser = argparse.ArgumentParser()
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>>> parser.add_argument('infile', type=argparse.FileType('r'))
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>>> parser.parse_args(['-'])
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Namespace(infile=<_io.TextIOWrapper name='<stdin>' encoding='UTF-8'>)
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>>> parser = argparse.ArgumentParser()
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>>> parser.add_argument('infile', type=argparse.FileType('r'))
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>>> parser.parse_args(['-'])
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Namespace(infile=<_io.TextIOWrapper name='<stdin>' encoding='UTF-8'>)
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Argument groups
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