From: R David Murray Date: Mon, 10 Mar 2014 00:33:35 +0000 (-0400) Subject: whatsnew: 'U' mode deprecation (#15204). X-Git-Tag: v3.4.1rc1~233^2~92 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c38f89146d801c4c4834b8b010f06fb9de2cc859;p=python whatsnew: 'U' mode deprecation (#15204). --- diff --git a/Doc/whatsnew/3.4.rst b/Doc/whatsnew/3.4.rst index d26cee64f0..4a65b89023 100644 --- a/Doc/whatsnew/3.4.rst +++ b/Doc/whatsnew/3.4.rst @@ -1948,6 +1948,11 @@ Deprecations in the Python API * The :mod:`sysconfig` key ``SO`` is deprecated, it has been replaced by ``EXT_SUFFIX``.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 @@ Changes in the Python API * 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