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

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> I am not sure disallowing tuple metavars would break backup 
> compatibility or not~

Given that tuple metavars currently doesn't work, there is no backward compatibility issue.  What is being proposed is to give more friendly error messages.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue14074>
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