[issue23298] Add ArgumentParser.add_mutually_dependence_group

[R. David Murray]

R. David Murray added the comment:

Well, it doesn't make much sense in the English language sense.  If I got that error message I'd have no idea what was wrong.

It sounds like what you want to do is dynamically make some arguments be required, depending on whether or not other arguments are present or not.

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nosy: +r.david.murray

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<http://bugs.python.org/issue23298>
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