[issue25882] argparse help error: arguments created by add_mutually_exclusive_group() are shown outside their parent group created by add_argument_group()

[paul j3]

paul j3 added the comment:

In

_ActionsContainer._add_container_actions there is this note:

    # add container's mutually exclusive groups
    # NOTE: if add_mutually_exclusive_group ever gains title= and
    # description= then this code will need to be expanded as above

In other bug/issues we've noted that the way to give an exclusive group a title and description is to nest it in an argument_group.

So it looks like no one has worked through the details - in this parent situation - of adding a nested mutually exclusive group.

In my preliminary tests, it looks like the 'group_map' is being messed up by the block of code that adds the mutually_exclusive_groups.  I don't know how easy it is to fix that.

The immediate user solution is not use parents and nested mutually exclusive groups together.

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nosy: +paul.j3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25882>
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