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state_group = parser.add_mutually_exclusive_group()
state_group.add_argument('--param1', nargs='?', const='default', metavar='NAME',
help=SUPPRESS)
state_group.add_argument('--param2', nargs='?', const='default', metavar='NAME',
help=SUPPRESS)will cause an assert in
assert ' '.join(opt_parts) == opt_usage
of argparse.py
because the empty group [] is converted into two spaces
e.g.
[group1] [] [group 2]
gets converted to this by the opt_usage = format(optionals, groups) code above the assert:
[group1] [group 2]
and the two spaces don't match the single space of the assert
Your environment
- CPython versions tested on: 3.10.4
- Operating system and architecture: OSX, arm64
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