Catherine Devlin <fredv8vi...@liquidid.net> added the comment:

I'm attaching a unit test patch that does something vaguely like Steven 
suggests.  It definitely needs review.

Also, I'm assuming that it's OK to specify *fewer* metavars than nargs, just 
not more... but I'm not sure about that.

----------
keywords: +patch
nosy: +catherine
Added file: http://bugs.python.org/file18327/wrong_metavars_test.patch

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