Steven Bethard added the comment:

@gcbirzan: Could you please open up a new issue? The current issue is fixed - 
it's just that the fix caused a new issue.

I would say that the `args` parameter was never intended to be anything but a 
list, so currently there's a documentation bug since that isn't stated 
explicitly anywhere. (But certainly the tests only test for lists, not any 
other sequences.)

Adding support for stuff other than lists feels more like a feature request, 
but given that it apparently worked by accident before, I guess we need to 
treat it as a bug. Probably the fix for that bug needs to have a ton of tests 
that check whether tuples work in all the various ways that parse_args is used.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13922>
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