paul j3 <[email protected]> added the comment:
Give the positional a non-none default:
e.g.
group.add_argument('args', metavar='ARGUMENT', nargs='*', default=[],
help='arguments to PROGRAM')
Since a '*' or '?' positional works with an empty list of arguments, it is
"always seen". It requires some special handling to allow it to work in the
mutually exclusive context. It's a tricky piece of code that might not be well
documented (if at all).
----------
nosy: +paul.j3
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<https://bugs.python.org/issue41854>
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