[issue11354] argparse: nargs could accept range of options count

[paul j3]

paul j3 added the comment:

With a minor tweak to `argparse._is_mnrep()`, `nargs='{3}'` would also work.  This means the same as `nargs=3`, so it isn't needed.  But it is consistent with the idea of accepting Regular Expression syntax where it makes sense.  `nargs='{2,3}?'` also works, though I think that's just the same as `nargs=2`.

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<http://bugs.python.org/issue11354>
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