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Enable testing with Python 3.15 by QuLogic · Pull Request #32202 · matplotlib/matplotlib · GitHub

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Enable testing with Python 3.15 - #32202

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tacaswell merged 2 commits into
matplotlib:mainfrom
QuLogic:py315
Oct 21, 2026
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Enable testing with Python 3.15#32202
tacaswell merged 2 commits into
matplotlib:mainfrom
QuLogic:py315

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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

melissawm added CI: testing CI configuration and testing Maintenance labels Aug 12, 2026

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.

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/

scottshambaugh commented Oct 10, 2026

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3.15 is out now

tacaswell marked this pull request as ready for review October 12, 2026 02:43
tacaswell closed this Oct 12, 2026
tacaswell reopened this Oct 12, 2026

tacaswell commented Oct 12, 2026

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power-cycled to re-run CI.

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.

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.

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.

QuLogic force-pushed the py315 branch 2 times, most recently from d31cccb to 4335d4d Compare October 16, 2026 00:25
khaeru mentioned this pull request Oct 16, 2026
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timhoffm reviewed Oct 16, 2026
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QuLogic mentioned this pull request Oct 16, 2026
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QuLogic force-pushed the py315 branch 4 times, most recently from 9cfcb58 to 4a10f88 Compare October 20, 2026 03:44
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.
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 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.

timhoffm approved these changes Oct 20, 2026
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Let's get 3.15 in now. We should investigate the Tk issues in a follow-up.

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