[Python] Add support and wheels for Python 3.15

Describe the enhancement requested

It is still early but we could try adding support for Python 3.15 with the Python 3.15.0 alpha 1. See 3.15.0 schedule

Related issue: #47823 and comment.

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Is there a way to setup the build so that a 3.15 failure doesn't fail the entire nightly?

@raulcd

Good question.
Looking at python_wheel_xlinux_build.sh, for example, the wheels seem to be built on PyArrow main and that should have the PyWeakref_GET_OBJECT fix (if that is what you had in mind with 3.15 failure). @raulcd please correct me if I am wrong.

Is there a way to setup the build so that a 3.15 failure doesn't fail the entire nightly?

I am not sure I understand the question. The different jobs for the nightlies are isolated. One job failing does not affect the others. If a Python 3.15 job would fail the rest of our Python CI nightly jobs won't be impacted. If the question wasn't about other jobs but for the specific Python 3.15 job if a test fails to continue this will depend on the failure, if the failure is a segfault when running a test or a build we won't be able to continue if it's a normal test failure we still keep running the rest of the tests.

By the way, I think is a good idea and we could try to have a job with this, probably start with a minimal one as we might have issues with building other Python dependencies (pandas? numpy?)

I was really asking whether a 3.15 failure would 'fail' the entire nightly. If not, great.

If I'm looking at this right, the changes needed are fairly modest.

* I assumed more work would be needed on the test cases, but it looks like the appropriate logic is in place to tolerate (skipif) missing CFFI and/or Pandas.

dev/tasks/tasks.yml: add cp315/315t
python/requirements-wheel-build.txt: numpy 2.3.5 doesn't have a 3.15 wheel, but built from source fine (nothing special needed, just pip installed it), so no changes are needed.
python/requirements-wheel-test.txt and python/requirements-test.txt: add markers for cffi & pandas ; python_version < "3.15"

I didn't build all the extensions, but the ninja-release-python preset built and tested fine: no pytest failures.

@paultiq

Thanks @paultiq !
If you want to submit a PR I am happy to help reviewing and/or guiding if there's something missing.

GH-48172: [Python] Add cp315 to build (#48191)

Issue resolved by pull request 48191
#48191

Cool that 3.15 is now supported!

When can we expect wheels on PyPI?

When can we expect wheels on PyPI?

I don't speak for the maintainers, but according to the GitHub milestone, 26.0.0 is scheduled for September 30th, so right before the final 3.15 release.

In the meantime you can use the nightly index. For example, with uv:

[tool.uv.sources]
pyarrow = [
    { index = "scientific-python-nightly-wheels", marker = "python_version >= '3.15'" },
]

[[tool.uv.index]]
name = "scientific-python-nightly-wheels"
url = "https://pypi.anaconda.org/scientific-python-nightly-wheels/simple"
explicit = true

feat: Support Python 3.15 (meltano#3726)

@edgarrmondragon

30th of September is just a placeholder for the feature freeze date for our next major release. Due to the Apache Software Foundation release process the release take some days to verify and vote. We plan to upload 3.15 wheels as part of the 26.0.0 release, in the meantime as @edgarrmondragon suggested you can use the nightlies to test.

Will wheels for pyarrow be published on PyPI for the Apache Arrow 26.0.0 RC0 release? That would enable us to start testing with pip install --pre.

once the release vote is successful, expected in ~72 hours if no blockers are found, I will upload the wheels to PyPI. We don't upload unreleased assets to PyPI.

Wheel are available on PyPI now.

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[Python] Add support and wheels for Python 3.15 #48172

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[Python] Add support and wheels for Python 3.15 #48172

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paultiq commented on Nov 19, 2025

AlenkaF commented on Nov 19, 2025

raulcd commented on Nov 19, 2025

raulcd commented on Nov 19, 2025

paultiq commented on Nov 19, 2025

paultiq commented on Nov 19, 2025

raulcd commented on Nov 20, 2025

raulcd commented on Aug 21, 2026

EwoutH commented on Aug 30, 2026

edgarrmondragon commented on Aug 30, 2026

raulcd commented on Sep 7, 2026

EwoutH commented on Oct 5, 2026

raulcd commented on Oct 5, 2026

raulcd commented on Oct 9, 2026

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