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

R. David Murray rdmurray at bitdance.com
Mon Mar 10 14🔞03 CET 2014

On Mon, 10 Mar 2014 23:09:53 +1000, Nick Coghlan <ncoghlan at gmail.com> wrote:

On 10 Mar 2014 11:36, "r.david.murray" <python-checkins at python.org> wrote: > > http://hg.python.org/cpython/rev/2d5544afb510 > changeset: 89547:2d5544afb510 > user: R David Murray <rdmurray at bitdance.com> > date: Sun Mar 09 20:33:35 2014 -0400 > summary: > whatsnew: 'U' mode deprecation (#15204). > > files: > Doc/whatsnew/3.4.rst | 14 +++++++++++++- > 1 files changed, 13 insertions(+), 1 deletions(-) > > > diff --git a/Doc/whatsnew/3.4.rst b/Doc/whatsnew/3.4.rst > --- a/Doc/whatsnew/3.4.rst > +++ b/Doc/whatsnew/3.4.rst > @@ -1948,6 +1948,11 @@ > * The :mod:sysconfig key SO is deprecated, it has been replaced by > EXTSUFFIX. > > +* The U mode accepted by various open functions is deprecated. > + In Python3 it does not do anything useful, and should be replaced by > + appropriate uses of :class:io.TextIOWrapper (if needed) and its newline > + argument. > +

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.

It's a deprecation, not a removal. I believe the idea is to not remove it before 4.0.

--David

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