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Thu Mar 20 21:50:22 CET 2008 · https://mail.python.org/pipermail/python-dev/2008-March/077948.html

Martin v. Löwis wrote:
>> Anything having to do with the str->bytes/unicode->str move is so far
>> off-limits to 2to3.
>>     
>
> Sure - but does that mean you need to separate code bases?
>
> Why does this move prevent people from running the same
> code in 2.x and 3.x? In 2.x, they should use Unicode objects
> for text and regular strings for binary data, and such code
> will run fine after converted by 2to3.
>   

Not if it includes code that looks like this:

    if type(response) in (str, unicode): .....

and it's really true that "[a]nything having to do with the 
str->bytes/unicode->str move is so far off-limits" to the upgrade tool.

-- 
Bob Kline
http://www.rksystems.com
mailto:bkline at rksystems.com

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[Python-Dev] The Breaking of distutils and PyPI for Python 3000?