Armin Rigo added the comment:
Getting consistently one behavior or the other would be much better imho; I
think it's wrong-ish to have the behavior depend uncontrollably on
implementation details. But I agree that it's slightly messy to declare which
of the two possible fixes is the "right" one. I'm slightly in favor of the
more permissive solution ("--bar 42" equivalent to no arguments at all if 42 is
the default) only because the other solution might break someone's existing
code. If I had no such backward-compatibility issue in mind, I'd vote for the
other solution (you can't specify "--bar" with any value, because you already
specified "--foo").
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<http://bugs.python.org/issue18943>
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