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Mon Mar 10 17:32:13 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-March/133036.html

10.03.14 15:09, Nick Coghlan написав(ла):
> Huh, I missed that change. Don't we still need U when writing 2/3
> compatible code at this point? If so, perhaps we may want to reconsider
> this particular deprecation in 3.4.1.

In most cases the 'U' mode either no-op or forbidden in Python 3. It may 
be needed only when you use built-in open() in Python 2 and open without 
the encoding and newlines arguments in Python 3 (but it will be better 
to use io.open()).

http://bugs.python.org/issue15204

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[Python-Dev] cpython: whatsnew: 'U' mode deprecation (#15204).