[issue9849] Argparse needs better error handling for nargs

[paul j3]

paul j3 added the comment:

http://bugs.python.org/issue21666
raises the possibility of testing the 'help' parameter in the same way.  By 
adding (to _check_argument):

        # check the 'help' string
        try:
            self._get_formatter()._expand_help(action)
        except (ValueError, TypeError, KeyError) as e:
            raise ArgumentError(action, 'badly formed help string')

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