== Summary ==
Update the Python stack in Fedora from Python 3.7 to Python 3.8.

== Owner ==
* Name: [[User:Churchyard|Miro HronĨok]]

== Detailed Description ==

We would like to upgrade Python to 3.8 in Fedora 31 thus we are
proposing this plan early.

See the upstream notes at
[ Features
for 3.8] and [ What's new
in 3.8].

=== Important dates and plan ===

* 2019-02-03 Python 3.8.0 alpha 1
** Package it as {{package|python38}} for testing purposes
** Start the bootstrap procedure in Copr
** Do a mass rebuild against every future release in Copr
* 2019-05-26 Python 3.8.0 beta 1
** If the Copr mass rebuild results were good, we will push the update
to rawhide and do the bootstrapping + mass rebuild in a side tag
* , 2019-06-23 Python 3.8.0 beta 2
** If the side tag bootstrapping and mass rebuild results were good,
we will merge it to Fedora at this point
* 2019-07-30 expected earliest Fedora 31 mass rebuild
* 2019-09-05 expected earliest Fedora 31 beta freeze
** Everything should be well tested on beta 1 to 4
* 2019-09-29 Python 3.8.0 candidate 1
** (we block Fedora release before we have this)
* 2019-10-16 expected earliest Fedora 31 final freeze
* 2019-10-20 Python 3.8.0 final
** Gets in with a pre-approved exception

(From [ Python 3.8
Release Schedule] and [[Releases/31/Schedule|Fedora 31 Release

The schedule is '''very tight''', but the Fedora dates are the
earliest estimates. So we are proposing this early, in the case the
Fedora schedule might need to be adjusted.

Note that upstream's "release candidates" are frozen except for
blocker bugs. Since we can and will backport blocker fixes between
Fedora and upstream, we essentially treat the Release Candidate as the
final release.

=== Notes from the previous upgrade ===
There are notes from the previous upgrade available, so this upgrade
may go smoother: [[SIGs/Python/UpgradingPython]]

== Benefit to Fedora ==
Fedora aims to showcase the latest in free and open source software -
we should have the most recent release of Python 3. Packages in Fedora
can use the new features from 3.8.

There's also a benefit to the larger Python ecosystem: by building
Fedora's packages against 3.8 while it's still in development, we can
catch critical bugs before the final 3.8.0 release.

== Scope ==

We will coordinate the work in a side tag and merge when ready.

* Proposal owners:
*# Introduce {{package|python38}} for all Fedoras
*# Prepare stuff in Copr as explained in description.
*# Retire {{package|python38}} from F31+
*# Update  {{package|python3}} to what was in {{package|python38}}
*#* Mass rebuild all the packages that BR
{{package|python3}}/{{package|python3-devel}}/... (~2700 listed in
[ Python 3 Porting Database for Fedora])
*# Reintroduce {{package|python37}} from Fedora 28. Update it to have
all fixes and enhancements from {{package|python3}} in Fedora 30 (or
31 before this change)
* Other developers: Maintainers of packages that fail to rebuild
during the rebuilds will be asked, using e-mail and bugzilla, to fix
or remove their packages from the distribution. If any issues appear,
they should be solvable either by communicating with the respective
upstreams first and/or applying downstream patches. Also the package
maintainers should have a look at:
Porting to Python 3.8]. And python-maint team will be available to
help with fixing issues.
* Fedora QA: Based on some troubles with the
[[Changes/Python3.6|change to 3.6]], we'd like to have an ack from QA
before we merge the side tag. We'd also like QA to approve this
* Release engineering: [ #8092] A
targeted rebuild for all python packages will be required, before the
mass rebuild.
** List of deliverables: nope
* Policies and guidelines: nope
* Trademark approval: nope

== Upgrade/compatibility impact ==
All the packages that depend on Python 3 must be rebuilt. User written
Python 3 scripts/applications may require a small amount of porting,
but mostly Python 3.7 is forward compatible with Python 3.8.

== How To Test ==
Interested testers do not need special hardware. If you have a
favorite Python 3 script, module, or application, please test it with
Python 3.8 and verify that it still works as you would expect. You can
test it using {{package|python38}} even before this change is
implemented, in Fedora 29 or 30.

Once the change is in place, test if you favorite Python apps are
working as they were before. File bugs if they don't.

== User Experience ==
Regular distro users shouldn't notice any change in system behavior
other than the Python 3 interpreter will be in version 3.8.

== Dependencies ==
~2700 packages depend on {{package|python3}}. See scope section.

== Contingency Plan ==
* Contingency mechanism: Do not merge the side tag with rawhide. If
the side tag has been merged and issues arise, that will justify a
downgrade, then use an epoch tag to revert to 3.7 version (never
needed before)
* Contingency deadline: TBD
* Blocks release? Yes, we'd like to block Fedora 31 release on at
least 3.8.0 rc 1
* Blocks product? See above

== Documentation ==
[ Python 3.8 Release Schedule]

[ Features for 3.8]

[ What's new in 3.8]

Porting to Python 3.8]

Ben Cotton
Fedora Program Manager
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