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

Nick Coghlan ncoghlan at gmail.com
Mon Mar 10 14:09:53 CET 2014

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+++ b/Doc/whatsnew/3.4.rst @@ -1948,6 +1948,11 @@ * The :mod:sysconfig key SO is deprecated, it has been replaced by EXTSUFFIX.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.

Cheers, Nick.

Deprecations in the C API ------------------------- @@ -2242,7 +2247,14 @@ * Since the digestmod argument to the :func:hmac.new function will in the future have no default, all calls to :func:hmac.new should be changed to - explicitly specify a digestmod. (:issue:17276). + explicitly specify a digestmod (:issue:17276). + +* Any calls to open functions that specify U should be modified. + U is ineffective in Python3 and will eventually raise an error if used. + Depending on the function, the equivalent of its old Python2 behavior can be + achieved using either a newline argument, or if necessary by wrapping the + stream in :mod:~io.TextIOWrapper to use its newline argument + (:issue:15204).

Changes in the C API -- Repository URL: http://hg.python.org/cpython

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