Re: [gentoo-dev] News item review: Python 3.6 to become the default target

[Michał Górny]

W dniu wto, 15.05.2018 o godzinie 08∶20 +0200, użytkownik Michał Górny
napisał:
> Hello, everyone.
>
> Please review the following news item. The 'xx'-es will be replaced with
> the publication date, making the deadline appropriately pub + 1 month.
>
> ---
> Title: Python 3.6 to become the default target
> Author: Michał Górny <mgorny@g.o>
> Posted: 2018-05-xx
> Revision: 1
> News-Item-Format: 2.0
> Display-If-Installed: dev-lang/python:3.5
>
> On 2018-06-xx, 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
>

Finally committed it.  This puts the deadline at 2018-06-22.
Also included users using python:3.4.

-- 
Best regards,
Michał Górny