F41 Change Proposal: Retire Python 2.7 (system-wide)

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Wiki - https://fedoraproject.org/wiki/Changes/RetirePython2.7
Discussion thread -
https://discussion.fedoraproject.org/t/f41-change-proposal-retire-python-2-7-system-wide/124331

This is a proposed Change for Fedora Linux.
This document represents a proposed Change. As part of the Changes
process, proposals are publicly announced in order to receive
community feedback. This proposal will only be implemented if approved
by the Fedora Engineering Steering Committee.

== Summary ==

The {{package|python2.7}} package will be retired without replacement
from [[Releases/41|Fedora Linux 41]].
There will be no Python 2 in Fedora 41+ other than PyPy.
Packages requiring {{package|python2.7}} on runtime or buildtime will
have to deal with the retirement or be retired as well.

== Owner ==

* Name: [[User:Churchyard|Miro Hrončok]]
* Email: mhroncok@xxxxxxxxxx




== Detailed Description ==

The {{package|python2.7}} package with the Python interpreter in
version 2.7 was kept in Fedora after upstream EOL
([https://devguide.python.org/versions/#versions 2020-01-01]) only to
make it possible for Fedora users to test their software against the
Python version shipped in RHEL 7, CentOS 7 and RHEL 8 and to support
remaining packages that could not be ported.

* Fedora 41 is to be released in October 2024, nearly 5 years after
the upstream EOL of Python 2.
* RHEL 7 will reach the end of its maintenance support 2 phase on
[https://www.redhat.com/en/technologies/linux-platforms/enterprise-linux/rhel-7-end-of-maintenance
2024-06-30].
* CentOS Linux 7 will reach end of life (EOL) on
[https://www.redhat.com/en/topics/linux/centos-linux-eol 2024-06-30].
* RHEL 8 Python 2.7 application stream retirement date is
[https://access.redhat.com/support/policy/updates/rhel-app-streams-life-cycle
June 2024].

=== Dependent packages ===

Based on `repoquery --repo=rawhide{,-source} --whatrequires
python2.7`, the following packages still depend on
{{package|python2.7}}:

* {{package|email2trac}} runtime and buidltime.
[https://bugzilla.redhat.com/1738907 rhbz#1738907] -- no response from
package maintainers since 2019. This package will be retired if not
fixed.
* {{package|flatpak-builder}} runtime only (shebang) in the tests
subpackage. [https://bugzilla.redhat.com/2249819 rhbz#2249819] -- no
response from package maintainers since late 2023, but we belive this
is a buggy dependency.
* {{package|flowcanvas}} buidltime only.
[https://bugzilla.redhat.com/1805233 rhbz#1805233] -- no response from
package maintainers since 2021. This package will fail to build and
will be eventually retired when Fedora 41 goes EOL if not fixed.
* {{package|kdissert}} buidltime only.
[https://bugzilla.redhat.com/1807513 rhbz#1807513] -- no response from
package maintainers since 2020. This package will fail to build and
will be eventually retired when Fedora 41 goes EOL if not fixed.
* {{package|qt5-qtwebengine}} buidltime only. No bugzilla. Package
bundles Python 2 for build in EPEL 9 and can probably do the same on
Fedora. Alternativelly, can use PyPy (untested assumption). This
package will fail to build and will be eventually retired when Fedora
41 goes EOL if not fixed.
* {{package|qtwebkit}} buidltime only.
[https://bugzilla.redhat.com/1807543 rhbz#1807543] -- no response from
package maintainers since 2021. The latest meaningful response: "The
plan is still to try to sunset Qt4WebKit entirely". This package will
fail to build and will be eventually retired when Fedora 41 goes EOL
if not fixed.

==== GIMP ====

The rest of the dependents exist merely for GIMP.

* {{package|gimp}}
* {{package|gimp-layer-via-copy-cut}}
* {{package|gimp-resynthesizer}}
* {{package|pygobject2}}
* {{package|pygtk2}}
* {{package|python2-cairo}}

[[Changes/Gimp_3|GIMP will be updated to GIMP 3 with Python 3
support]]. Python 2 dependencies of GIMP will be retired.

If by the time of the Fedora 41 Beta Freeze (2024-08-20) no Release
Candidate of GIMP 3 has come around, we will postpone the retirement
of Python 2 to Fedora 42.

== Feedback ==

See the [https://discussion.fedoraproject.org/t/f41-change-proposal-gimp-version-3-self-contained/120254/38
GIMP 3 discussion] for feedback from the GIMP maintainer.

== Benefit to Fedora ==

The Python maintainers will no longer regularly backport security
fixes to Python 2.7 in RHEL, due to the the end of maintenance of RHEL
7 and the retirement of the Python 2.7 application stream in RHEL 8.
We provided this obsolete package for 5 years beyond its retirement
date and will continue to provide it until Fedora 40 goes end of life.
Enough has been enough.

We do not wish to simply orphan the package, as we are afraid it would
not receive proper care if taken by somebody else.
If there are potential maintainers interested in maintaining Python 2
in Fedora beyond Fedora 41, they can talk to us and demonstrate their
ability and will to take care of Python 2 by joining the maintenance
early.

Users who need to run their application in Python 2 should do so on a
platform that offers support for it. Running applications on
unsupported Python is dangerous.

Developers who still need to test their software on Python 2 can use
containers with older Fedora releases or unsupported CentOS/RHEL
versions.

== Scope ==
* Proposal owners:
** Coordinate closely with the GIMP maintainers.
** `fedpkg retire python2.7` before the beta freeze if GIMP is ready.
** Remove `Recommends: python2.7` from {{package|asv}} and {{package|tox}}.


* Other developers:
** Retire or fix the remaining dependent packages.

* Release engineering: [https://pagure.io/releng/issue/12175 #12175]

* Policies and guidelines: Using Python 2 is already forbidden for
Fedora packages.

* Trademark approval: not needed for this Change

* Alignment with the Fedora Strategy: n/a


== Upgrade/compatibility impact ==

Unless Python 2 stops being installable, we do not plan to Obsolete it.
Users who upgrade to Fedora Linux 41+ from earlier releases with
Python 2 installed, will likely still get it, but they will receive no
support.


== Early Testing (Optional) ==
Do you require 'QA Blueprint' support? N

== How To Test ==

Try installing {{package|python2.7}} on Fedora Linux 41+. It should fail.


== User Experience ==

Some users might be unhappy about this, but we decided to do it
anyway. We cannot keep legacy software forever, Fedora Linux is not
that kind of Linux.


== Dependencies ==

* [[Changes/Gimp_3]]


== Contingency Plan ==

* Contingency mechanism: postpone to Fedora 42
* Contingency deadline: A week after Beta Freeze
* Blocks release? No

== Documentation ==
There is no more Python 2 in Fedora Linux 41+.

== Release Notes ==
There is no more Python 2 in Fedora Linux 41+.



-- 
Aoife Moloney

Fedora Operations Architect

Fedora Project

Matrix: @amoloney:fedora.im

IRC: amoloney

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