Steven Bethard <steven.beth...@gmail.com> added the comment:
You can specify either 1 or N. So for n=3, you can specify metavar="X" or
metavar=("X", "Y", "Z") but not metavar=("X", "Y"). The special nargs value "?"
always takes only one, while "*" and "+" always take two. (This makes sense if
you think about how they're formatted, e.g. "X [X ...]".)
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9348>
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