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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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11354>
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