[Python-Dev] The fate of the -U option

Barry Warsaw barry at python.org
Thu Feb 4 10:13:25 CET 2010

On Feb 03, 2010, at 09:55 AM, Guido van Rossum wrote:

>On Wed, Feb 3, 2010 at 9:09 AM, Barry Warsaw <barry at python.org> wrote:

>> -----snip snip-----
>> from __future__ import unicode_literals
>> def func(foo, bar):
>>    print foo, bar
>> kw = {'foo': 7, 'bar': 9}
>> func(**kw)
>> -----snip snip-----
>> That will raise a TypeError in 2.6 but works in 2.7.  Is it appropriate and
>> feasible to back port that to Python 2.6?  I remember talking about this a
>> while back but I don't remember what we decided and I can't find a bug on the
>> issue.
>I don't know about feasible but I think it's (borderline) appropriate.
>There are various other paths that lead to this error and it feels to
>me it's just a long-standing bug that we never took care of until 2.7.
>However, I don't think it needs to support non-ASCII characters in the
>keywords (even though 2.7 does seem to support those).

The back port from trunk of r68805 to fix this was really pretty trivial.


Assigned to Benjamin for review.
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