Message377460
The following code:
group = parser.add_mutually_exclusive_group()
group.add_argument('--install-only', action='store_true',
help='just install the program, do not run it')
group.add_argument('args', metavar='ARGUMENT', nargs='*', default=None,
help='arguments to PROGRAM')
gives the following error:
group.add_argument('args', metavar='ARGUMENT', nargs='*',
File "/usr/lib/python3.8/argparse.py", line 1398, in add_argument
return self._add_action(action)
File "/usr/lib/python3.8/argparse.py", line 1621, in _add_action
raise ValueError(msg)
ValueError: mutually exclusive arguments must be optional
But the 'args' argument *is* optional, as there can be 0 of them. |
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Date |
User |
Action |
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2020-09-24 20:23:50 | rrt | set | recipients:
+ rrt |
2020-09-24 20:23:50 | rrt | set | messageid: <1600979030.91.0.326865229332.issue41854@roundup.psfhosted.org> |
2020-09-24 20:23:50 | rrt | link | issue41854 messages |
2020-09-24 20:23:50 | rrt | create | |
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