[issue18349] argparse usage should preserve () in metavars such as range(20)

[paul j3]

paul j3 added the comment:

This issue should also preserve a metavar like: '(one)two', i.e. '(' at the start.  

In http://bugs.python.org/issue10984 these _re replacements are applied to individual action strings as well as the whole usage line.  So if () are to be removed from '[-h] (-y)', they should also be removed from '(-y)'.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18349>
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