[issue14074] argparse allows nargs>1 for positional arguments but doesn't allow metavar to be a tuple

[paul j3]

paul j3 added the comment:

An alternative fix is to disallow tuple metavars for positionals.  

A tuple metavar may look nice in the usage.  But a well selected dest seems better in the help line, and error messages.  Using dest in all 3 roles, as we do now, is the simplest compromise.

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<http://bugs.python.org/issue14074>
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