paul j3 added the comment:
This nargs test using the formater applies only when the container has a help
formatter. That is true for a ArgumentParser, but not for an argument_group.
group = parser.add_argument_group('g')
group.add_argument('bar', nargs='test')
does not raise an error.
format_help will produce an error: ...
File "./argparse.py", line 585, in _format_args
formats = ['%s' for _ in range(action.nargs)]
TypeError: 'str' object cannot be interpreted as an integer
while parse_args produces the error: ...
File "./argparse.py", line 2200, in _get_nargs_pattern
nargs_pattern = '(-*%s-*)' % '-*'.join('A' * nargs)
TypeError: can't multiply sequence by non-int of type 'str'
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<http://bugs.python.org/issue9849>
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