Is there a way to require a mutually exclusive group, where one of the groups has multiple options?

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I would like a behavior where exactly one of

  • --a
  • --b AND --c

are required. I know how to do it if the second requirement were just --b:

group = parser.add_mutually_exclusive_group(required=True)
group.add_argument('--a', type=str)
group.add_argument('--b', type=str)


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