[issue14074] argparse allows nargs>1 for positional arguments but doesn't allow metavar to be a tuple

[Cyker Way]

Cyker Way <cykerway at gmail.com> added the comment:

Can confirm this bug still exists on master branch, python3.7, python3.6, and very likely other versions since it's reported.

It seems only `_format_action_invocation` and `_get_action_name` need to be fixed. So we can do it more lightweight (<10 lines).

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nosy: +cykerway
Added file: https://bugs.python.org/file47965/14074.patch

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<https://bugs.python.org/issue14074>
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