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