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

[paul j3]

paul j3 added the comment:

oops - to fix the error message that OP complained about, I need to patch 
'_get_action_name' as well:

    def _get_action_name(argument):
    ...
        elif argument.metavar not in (None, SUPPRESS):
            metavar = argument.metavar
            if isinstance(metavar, tuple):
                metavar = '|'.join(metavar)
            return metavar

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