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<!-- The actual name of your proposed change page should look something like: Changes/Your_Change_Proposal_Name.  This keeps all change proposals in the same namespace -->
<!-- The actual name of your proposed change page should look something like: Changes/Your_Change_Proposal_Name.  This keeps all change proposals in the same namespace -->
= Python 3.8 <!-- The name of your change proposal --> =
= Python 3.8 <!-- The name of your change proposal --> =
{{admon/important|Deferred to Fedora 32|This change was originally proposed for [[Releases/31|Fedora 31]], but has been deferred to [[Releases/32|Fedora 32]].}}


== Summary ==
== Summary ==
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== Current status ==
== Current status ==
* Targeted release: [[Releases/31 | Fedora 31 ]]  
* Targeted release: [[Releases/32|Fedora 32]]  
* Last updated: <!-- this is an automatic macro — you don't need to change this line -->  {{REVISIONYEAR}}-{{REVISIONMONTH}}-{{REVISIONDAY2}}  
* Last updated: <!-- this is an automatic macro — you don't need to change this line -->  {{REVISIONYEAR}}-{{REVISIONMONTH}}-{{REVISIONDAY2}}  
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CLOSED as NEXTRELEASE -> change is completed and verified and will be delivered in next release under development
CLOSED as NEXTRELEASE -> change is completed and verified and will be delivered in next release under development
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* Tracker bug: <will be assigned by the Wrangler>
* Tracker bug: [https://bugzilla.redhat.com/show_bug.cgi?id=1686977 #1686977]
* Release notes tracker: [https://pagure.io/fedora-docs/release-notes/issue/310 #310]


== Detailed Description ==
== Detailed Description ==


We want to upgrade Python to 3.8 in Fedora 31 and we propose this plan early.
We would like to upgrade Python to 3.8 in <del>Fedora 31</del> Fedora 32 thus we are proposing this plan early.


See the upstream notes at [https://www.python.org/dev/peps/pep-0569/#features-for-3-8 Features for 3.8] and [https://docs.python.org/3.8/whatsnew/3.8.html What's new in 3.8].
See the upstream notes at [https://www.python.org/dev/peps/pep-0569/#features-for-3-8 Features for 3.8] and [https://docs.python.org/3.8/whatsnew/3.8.html What's new in 3.8].


=== Important dates and plan ===
=== Important dates and plan (updated for Fedora 32) ===


* 2019-02-03 Python 3.8.0 alpha 1
* 2019-02-03 Python 3.8.0 alpha 1
** we package it as {{package|python38}} for testing purposes
** Package it as {{package|python38}} for testing purposes
** we start bootstrapping against it in Copr
** Start the bootstrap procedure in Copr
** we mass rebuild against every future release in Copr
** Do a mass rebuild against every future release in Copr
* 2019-05-26 Python 3.8.0 beta 1
* 2019-06-04 Python 3.8.0 beta 1 (was: 2019-05-27)
** if Copr was good, we push to rawhide and bootstrap + mass rebuild in a side tag
* 2019-07-04 Python 3.8.0 beta 2 (was: 2019-07-01)
* , 2019-06-23 Python 3.8.0 beta 2
* <del>2019-07-24 expected Fedora 31 mass rebuild</del>
** if side tag was good, we merge it to Fedora at this point
* 2019-07-29 Python 3.8.0 beta 3
* 2019-07-30 expected earliest Fedora 31 mass rebuild
* 2019-08-13 expected Fedora 31 branching (Rawhide becomes future Fedora 32)
* 2019-09-05 expected earliest Fedora 31 beta freeze
** after branching, we can start building in Fedora 32 side tag
** everything should be well tested on beta 1 to 4
* 2019-08-21 The side tag was merged
* 2019-09-29 Python 3.8.0 candidate 1
* 2019-08-26 Python 3.8.0 beta 4
** (we block Fedora release before we have this)
* <del>2019-08-29 expected Fedora 31 beta freeze</del>
* 2019-10-16 expected earliest Fedora 31 final freeze
* 2019-09-30 Python 3.8.0 candidate 1
* 2019-10-20 Python 3.8.0 final
* 2019-10-07 Python 3.8.0 candidate 2 (if necessary)
** gets in with an pre-approved exception
* <del>2019-10-08 expected Fedora 31 final freeze</del>
* 2019-10-21 Python 3.8.0 final
* 2020-01-24 expected Fedora 32 mass rebuild
** gives us about 3 months between side tag merge and mass rebuild
* 2020-02-29 expected Fedora 32 beta freeze
** gives us about 4 months between side tag merge and beta freeze
** chances are, 3.8.1 is already out at this point


(From [https://www.python.org/dev/peps/pep-0569/#schedule Python 3.8 Release Schedule] and [[Releases/31/Schedule|Fedora 31 Release Schedule]].)
(From [https://www.python.org/dev/peps/pep-0569/#schedule Python 3.8 Release Schedule] and [[Releases/31/Schedule|Fedora 31 Release Schedule]] ([[Releases/32/Schedule|Fedora 32 Release Schedule]] is not yet available).)


The schedule is '''very tight''', but the Fedora dates are the earliest expectations. So we propose this early and the Fedora schedule might get adjusted.
<del>The schedule is '''very tight''' for Fedora 31. So we are proposing this early, in the case the Fedora schedule might need to be adjusted.</del>


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.
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.
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<!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
<!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
*# Introduce {{package|python38}} for all Fedoras
*# Introduce {{package|python38}} for all Fedoras
*# Prep stuff in Copr as explained in description.
*# Prepare stuff in Copr as explained in description.
*# Retire {{package|python38}} from F31+
*# Retire {{package|python38}} from F32+
*# Update  {{package|python3}} to what was in {{package|python38}}
*# Update  {{package|python3}} to what was in {{package|python38}}
*#* Mass rebuild all the packages that BR {{package|python3}}/{{package|python3-devel}}/... (~2700 listed in [http://fedora.portingdb.xyz/ Python 3 Porting Database for Fedora])
*#* Mass rebuild all the packages that BR {{package|python3}}/{{package|python3-devel}}/... (~3000 listed in [http://fedora.portingdb.xyz/ 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)
*# Reintroduce {{package|python37}} from Fedora 28. Update it to have all fixes and enhancements from {{package|python3}} in Fedora 31 (or 32 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 upstreams first and/or applying downstream patches. Also the package maintainers should have a look at: [https://docs.python.org/3.8/whatsnew/3.8.html#porting-to-python-3-8 Porting to Python 3.8]. And python-maint team will be available to help with fixing issues.
* 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: [https://docs.python.org/3.8/whatsnew/3.8.html#porting-to-python-3-8 Porting to Python 3.8]. And python-maint team will be available to help with fixing issues.
<!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
<!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->


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<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->


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 expect. You can test it using {{package|python38}} even before this change is implemented, in Fedora 29 or 30.
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. If the application you are testing does not require any other modules, 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 bugzillas if they don't.
In case your application requires other modules, or if you are testing an rpm package, it is necessary to install the 3.8 version of the python3 rpm. Right now that rpm is available in copr, along with all other python packages that build successfully with python 3.8. See https://copr.fedorainfracloud.org/coprs/g/python/python3.8/ for detailed instructions how to enable Python 3.8 copr for mock.
 
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 ==
== User Experience ==
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* Contingency deadline: TBD  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
* Contingency deadline: TBD  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
<!-- Does finishing this feature block the release, or can we ship with the feature in incomplete state? -->
<!-- Does finishing this feature block the release, or can we ship with the feature in incomplete state? -->
* Blocks release? Yes, we'd like to block Fedora 31 release on at least 3.8.0 rc 1 <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
* Blocks release? Yes, we'd like to block Fedora 32 release on at least 3.8.0rc1 <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
* Blocks product? See above <!-- Applicable for Changes that blocks specific product release/Fedora.next -->
* Blocks product? See above <!-- Applicable for Changes that blocks specific product release/Fedora.next -->


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Release Notes are not required for initial draft of the Change Proposal but has to be completed by the Change Freeze.  
Release Notes are not required for initial draft of the Change Proposal but has to be completed by the Change Freeze.  
-->
-->
Note: Make sure to document this: https://bugzilla.redhat.com/show_bug.cgi?id=1812598


* Release Notes tracking: [https://pagure.io/fedora-docs/release-notes/issue/XXX #XXX]
* Release Notes tracking: [https://pagure.io/fedora-docs/release-notes/issue/XXX #XXX]


[[Category:ChangeReadyForWrangler]]
[[Category:ChangeAcceptedF32]]
<!-- When your change proposal page is completed and ready for review and announcement -->
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Latest revision as of 17:26, 11 March 2020


Python 3.8

Deferred to Fedora 32
This change was originally proposed for Fedora 31, but has been deferred to Fedora 32.

Summary

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

Owner

  • Email: python-maint@redhat.com
  • Release notes owner:

Current status

Detailed Description

We would like to upgrade Python to 3.8 in Fedora 31 Fedora 32 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 (updated for Fedora 32)

  • 2019-02-03 Python 3.8.0 alpha 1
    • Package it as python38 for testing purposes
    • Start the bootstrap procedure in Copr
    • Do a mass rebuild against every future release in Copr
  • 2019-06-04 Python 3.8.0 beta 1 (was: 2019-05-27)
  • 2019-07-04 Python 3.8.0 beta 2 (was: 2019-07-01)
  • 2019-07-24 expected Fedora 31 mass rebuild
  • 2019-07-29 Python 3.8.0 beta 3
  • 2019-08-13 expected Fedora 31 branching (Rawhide becomes future Fedora 32)
    • after branching, we can start building in Fedora 32 side tag
  • 2019-08-21 The side tag was merged
  • 2019-08-26 Python 3.8.0 beta 4
  • 2019-08-29 expected Fedora 31 beta freeze
  • 2019-09-30 Python 3.8.0 candidate 1
  • 2019-10-07 Python 3.8.0 candidate 2 (if necessary)
  • 2019-10-08 expected Fedora 31 final freeze
  • 2019-10-21 Python 3.8.0 final
  • 2020-01-24 expected Fedora 32 mass rebuild
    • gives us about 3 months between side tag merge and mass rebuild
  • 2020-02-29 expected Fedora 32 beta freeze
    • gives us about 4 months between side tag merge and beta freeze
    • chances are, 3.8.1 is already out at this point

(From Python 3.8 Release Schedule and Fedora 31 Release Schedule (Fedora 32 Release Schedule is not yet available).)

The schedule is very tight for Fedora 31. 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.

  • 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 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 change.
  • Release engineering: #8092 A targeted rebuild for all python packages will be required, before the mass rebuild.
  • 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. If the application you are testing does not require any other modules, you can test it using python38 even before this change is implemented, in Fedora 29 or 30.

In case your application requires other modules, or if you are testing an rpm package, it is necessary to install the 3.8 version of the python3 rpm. Right now that rpm is available in copr, along with all other python packages that build successfully with python 3.8. See https://copr.fedorainfracloud.org/coprs/g/python/python3.8/ for detailed instructions how to enable Python 3.8 copr for mock.

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 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 32 release on at least 3.8.0rc1
  • 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

Release Notes

Note: Make sure to document this: https://bugzilla.redhat.com/show_bug.cgi?id=1812598

  • Release Notes tracking: #XXX
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