paul j3 added the comment:
While playing with some examples, I found that exclusive group formatting has
another failure case. If the usage line is long enough to wrap, optionals and
positionals are formatted separately, with positionals appearing on a separate
line(s). That means that if a group includes a positional, it will not be
marked.
So (shortening lines for convenience sake), instead of:
usage: [-h] ... (-a | -b | x)
we get
usage: [-h] ... [-a] [-b]
x
This is true even if arguments are added to the group in the normal way.
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<http://bugs.python.org/issue10984>
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