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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