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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