[Python-checkins] cpython: whatsnew: 'U' mode deprecation (#15204).
r.david.murray
python-checkins at python.org
Mon Mar 10 02:35:12 CET 2014
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* The :mod:`sysconfig` key ``SO`` is deprecated, it has been replaced by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.
+
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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