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

[R. David Murray]

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  * The :mod:`sysconfig` key ``SO`` is deprecated, it has been replaced by
> >    ``EXT_SUFFIX``.
> >
> > +* 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