[issue9348] Calling argparse's add_argument with the wrong number of metavars causes delayed error message

[Steven Bethard]

Steven Bethard <steven.bethard at 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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<http://bugs.python.org/issue9348>
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