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GeezerVison is showing github.com — Enable testing with Python 3.15 by QuLogic · Pull Request #32202 · matplotlib/matplotlib

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@QuLogic

@QuLogic QuLogic commented Aug 12, 2026

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PR summary

Since Python 3.15 has now had its first release candidate, the wheel ABI is stable, and we can start to see wheels being deployed. So we should be able to enable testing as well.

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PR quality check

  • Use an expressive title, e.g. "Fix title font property precedence"
  • New and changed code is tested
  • [n/a] Plotting related features are demonstrated in an example
  • [n/a] New features and API changes have release notes
  • Documentation complies with general and docstring guidelines

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@QuLogic
QuLogic force-pushed the py315 branch from b320c41 to c59c076 Compare August 12, 2026 06:14
@melissawm melissawm added CI: testing CI configuration and testing Maintenance labels Aug 12, 2026
@QuLogic

QuLogic commented Aug 15, 2026

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Very strange that so many things are hanging here; I cannot reproduce this locally with whatever toolkits I can install.
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@QuLogic
QuLogic force-pushed the py315 branch from c59c076 to 3670e04 Compare August 29, 2026 03:13
@QuLogic
QuLogic force-pushed the py315 branch from c289811 to c986fa9 Compare September 10, 2026 19:45
@scottshambaugh

scottshambaugh commented Oct 4, 2026

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Heads up that python 3.15rc3 is released now, with full release set for October 9.

https://www.python.org/downloads/release/python-3150rc3/
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@scottshambaugh

scottshambaugh commented Oct 10, 2026

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3.15 is out now
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@tacaswell
tacaswell marked this pull request as ready for review October 12, 2026 02:43
@tacaswell tacaswell closed this Oct 12, 2026
@tacaswell tacaswell reopened this Oct 12, 2026
@tacaswell

tacaswell commented Oct 12, 2026

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power-cycled to re-run CI.
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@QuLogic
QuLogic force-pushed the py315 branch from c986fa9 to 50596ac Compare October 13, 2026 19:59
@QuLogic

QuLogic commented Oct 14, 2026

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Still seems to be timing out with Tk backend tests, and still I can't reproduce it locally.
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@timhoffm

timhoffm commented Oct 15, 2026

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There are also timeouts for

  • lib/matplotlib/tests/test_backends_interactive.py::test_lazy_auto_backend_selection
  • lib/matplotlib/tests/test_backends_interactive.py::test_qt_missing

maybe it’s not a Tk-specific issue but more generally a subprocess topic. I’d try to deactivate parallel test execution to exclude any race conditions.
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@QuLogic

QuLogic commented Oct 15, 2026

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We can try, but both could still be hanging trying to auto-select Tk. The subprocess tests in, e.g., test_rcparams.py seem okay.
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@QuLogic
QuLogic force-pushed the py315 branch 2 times, most recently from d31cccb to 4335d4d Compare October 16, 2026 00:25
@khaeru khaeru mentioned this pull request Oct 16, 2026
Confirm support for Python 3.15 and drop 3.10 khaeru/genno#204
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timhoffm
timhoffm reviewed Oct 16, 2026
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Comment thread .github/workflows/tests.yml Resolved

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@QuLogic QuLogic mentioned this pull request Oct 16, 2026
ci: Test running on Ubuntu 26.04 #32478
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@QuLogic
QuLogic force-pushed the py315 branch 4 times, most recently from 9cfcb58 to 4a10f88 Compare October 20, 2026 03:44
QuLogic added 2 commits October 20, 2026 00:16
@QuLogic
Enable testing with Python 3.15
939f35c 
Since Python 3.15 has now had its first release candidate, the wheel ABI
is stable, and we can start to see wheels being deployed. So we should be
able to enable testing as well.
@QuLogic
ci: Skip GUI backends on 3.15 for now
34afefc 
We can re-enable these once the packages have tested wheels available,
and Tk doesn't freeze.
@QuLogic
QuLogic force-pushed the py315 branch from 4a10f88 to 34afefc Compare October 20, 2026 04:16
@QuLogic

QuLogic commented Oct 20, 2026

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The final Python 3.15 release seemed to have fixed the code coverage brokenness, so I tried again with Tk, but it's still hanging, so I'm leaving that out again.
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timhoffm
timhoffm approved these changes Oct 20, 2026
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Let's get 3.15 in now. We should investigate the Tk issues in a follow-up.

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@tacaswell
tacaswell merged commit 98dd035 into matplotlib:main Oct 21, 2026
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@QuLogic
QuLogic deleted the py315 branch October 21, 2026 00:51
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@timhoffm timhoffm timhoffm approved these changes

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5 participants

@QuLogic @scottshambaugh @tacaswell @timhoffm @melissawm
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