commit: 226f7edc8ca431f523e014cfc98751780ec0994c Author: Michał Górny <mgorny <AT> gentoo <DOT> org> AuthorDate: Tue May 22 16:27:19 2018 +0000 Commit: Michał Górny <mgorny <AT> gentoo <DOT> org> CommitDate: Tue May 22 16:27:19 2018 +0000 URL: https://gitweb.gentoo.org/data/gentoo-news.git/commit/?id=226f7edc
New item: Python 3.6 to become the default target 2018-05-22-python3-6/2018-05-22-python3-6.en.txt | 61 ++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/2018-05-22-python3-6/2018-05-22-python3-6.en.txt b/2018-05-22-python3-6/2018-05-22-python3-6.en.txt new file mode 100644 index 0000000..c8901e9 --- /dev/null +++ b/2018-05-22-python3-6/2018-05-22-python3-6.en.txt @@ -0,0 +1,61 @@ +Title: Python 3.6 to become the default target +Author: Michał Górny <mgo...@gentoo.org> +Posted: 2018-05-22 +Revision: 1 +News-Item-Format: 2.0 +Display-If-Installed: dev-lang/python:3.4 +Display-If-Installed: dev-lang/python:3.5 + +On 2018-06-22, Python 3.6 will replace Python 3.5 in the default Python +targets for Gentoo systems. The new default targets will be: + + PYTHON_TARGETS="python2_7 python3_6" + PYTHON_SINGLE_TARGET="python3_6" + +If you have not overriden the value of those variables on your system, +then your package manager will want to use the new targets immediately. +In order to prevent dependency conflicts, please clean stray packages +and rebuild/upgrade all packages with USE flag changes after the change, +e.g.: + + emerge --depclean + emerge -1vUD @world + emerge --depclean + +Please note that upgrading dependencies in place may cause some +of the package dependencies to be temporarily missing. While this +should not affect scripts that are already fully loaded, it may cause +ImportErrors while starting Python scripts or loading additional +modules (only scripts running Python 3.5 are affected). + +In order to improve stability of the upgrade, you may choose to +temporarily enable both targets, i.e. set in /etc/portage/make.conf +or its equivalent: + + PYTHON_TARGETS="python2_7 python3_5 python3_6" + PYTHON_SINGLE_TARGET="python3_5" + +This will cause the dependencies to include both Python 3.5 and 3.6 +support on the next system upgrade. Once all packages are updated, +you can restart your scripts, remove the custom setting and run another +upgrade to remove support for Python 3.5. + +If you would like to postpone the switch to Python 3.6, you can copy +the current value of PYTHON_TARGETS and/or PYTHON_SINGLE_TARGET +to /etc/portage/make.conf or its equivalent: + + PYTHON_TARGETS="python2_7 python3_5" + PYTHON_SINGLE_TARGET="python3_5" + +If you would like to migrate your systems earlier, you can do the same +with the new value. + +If you are still using Python 3.4, please consider switching to a newer +version as it is reaching its end-of-life. The end-of-life dates +for the currently used versions are: + + Python 3.4 2019-03-16 + Python 2.7 2020-01-01 + Python 3.5 2020-09-13 [1] + +[1]:https://devguide.python.org/#status-of-python-branches
