[issue11874] argparse assertion failure with brackets in metavars

[paul j3]

paul j3 added the comment:

Another example of code hitting this AssertionError.  Here the problem was a space in the option argument, '--out '.

http://stackoverflow.com/questions/23159845/python-argparse-assertionerror

'parser.add_argument('-o', '--out ', help='b', required = True)'

That space would have cause problems later when trying access the 'args' attributes.  But producing the error during the help formatting didn't help.

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<http://bugs.python.org/issue11874>
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