build: add support for python 3.14

[CandiedCode]

Summary

Fixes #16750

While scanning my docker images for CVE's there are several that are being found due to python 3.13

NAME                INSTALLED                     FIXED IN     TYPE    VULNERABILITY        SEVERITY    EPSS           RISK 
python              3.13.13                                    binary  CVE-2025-12781       Medium      < 0.1% (4th)   < 0.1  
python              3.13.13                                    binary  CVE-2026-1502        Medium      < 0.1% (18th)  < 0.1  
python              3.13.13                                    binary  CVE-2026-3298        High        < 0.1% (20th)  < 0.1  
python              3.13.13                                    binary  CVE-2026-4786        High        < 0.1% (5th)   < 0.1  
python              3.13.13                                    binary  CVE-2026-6019        Low         < 0.1% (15th)  < 0.1  
python              3.13.13                                    binary  CVE-2026-6100        Critical    0.2% (35th)    0.1    

Pytorch and vllm support python 3.14, but I'm unable to upgrade until Executorch supports 3.14 as well.

Test plan

I added 3.14 to CI for it to run all the tests

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19254

• 📄 Preview Python docs built from this PR

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❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• [ROCm] MI350 CI jobs will have longer queue times due to CI migration

❌ 2 Pending, 2 Unrelated Failures, 9 Unclassified Failures

As of commit 0dd706e with merge base 99bce90 ():

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• Build Aarch64 Linux Wheels / pytorch/executorch / build-wheel-py3_14-cpu-aarch64 (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  /tmp/pip-install-3_2_x97p/scipy_b5f24b2bb91f49dbaf2a079c3fb9d3e5/.mesonpy-zj168kdz/meson-private/tmpa5usbicj/testfile.c:5:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'foo'
• Build Aarch64 Linux Wheels / pytorch/executorch / upload / upload-wheel-py3_14-cpu-aarch64 (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.14_cpu_aarch64
• Build Linux Wheels / pytorch/executorch / build-manywheel-py3_14-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  /tmp/pip-install-sopaulfm/scipy_91edaa7566ca4bca81d7097390f0f45c/.mesonpy-bc2_ni3o/meson-private/tmpy49b23ac/testfile.c:5:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'foo'
• Build Linux Wheels / pytorch/executorch / upload / upload-manywheel-py3_14-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.14_cpu_x86_64
• Build macOS Wheels / pytorch/executorch / build-wheel-py3_14-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Process completed with exit code 1.
• Build macOS Wheels / pytorch/executorch / upload / upload-wheel-py3_14-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.14_cpu_
• Build Windows Wheels / pytorch/executorch / build-wheel-py3_14-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  ..\numpy\_core\src\common\simd/simd.h(4): fatal error C1083: Cannot open include file: 'stdalign.h': No such file or directory
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_14-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.14_cpu_x64
• pull / test-qnn-wheel-packages-linux (3.14) / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  RuntimeError: Command docker exec -t 5c095cff283629dc3c41e4061d73a0904e4a7670f60247189ea58c0176739a23 /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)
• trunk / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[github-actions]

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[Copilot]

Pull request overview

This PR updates ExecuTorch’s packaging metadata, documentation, and CI matrices to recognize/support Python 3.14 (issue #16750), primarily by widening the declared supported Python range and running CI/wheel builds against 3.14.

Changes:

• Expand supported Python range in packaging metadata (requires-python, classifiers) and formatting config (Black target versions).
• Update multiple docs/READMEs to advertise Python 3.14 support.
• Add Python 3.14 to GitHub Actions test and wheel build matrices.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pyproject.toml	Add Python 3.14 classifier; widen requires-python to <3.15; include py314 for Black.
docs/source/using-executorch-building-from-source.md	Update documented supported Python range to 3.10–3.14.
docs/source/raspberry_pi_llama_tutorial.md	Update prerequisite Python range and version-check guidance to 3.10–3.14.
docs/source/quick-start-section.md	Update prerequisite Python range to 3.10–3.14.
docs/source/pathway-quickstart.md	Update virtualenv Python range guidance to 3.10–3.14.
docs/source/pathway-beginner.md	Update prerequisites to 3.10–3.14.
docs/source/getting-started.md	Update system requirements to 3.10–3.14.
README-wheel.md	Update supported Python versions list to include 3.14.
.github/workflows/pull.yml	Add 3.14 to the test-qnn-wheel-packages-linux matrix.
.github/workflows/build-wheels-windows.yml	Add 3.14 to wheel build matrix.
.github/workflows/build-wheels-macos.yml	Add 3.14 to wheel build matrix.
.github/workflows/build-wheels-linux.yml	Add 3.14 to wheel build matrix.
.github/workflows/build-wheels-aarch64-linux.yml	Add 3.14 to wheel build matrix.
.claude/skills/building/SKILL.md	Update Python version guidance to include 3.14.
.ci/scripts/test_coreml_bc.sh	Update comment about Python compatibility for backward-compat CoreML test script.

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[Copilot]

Pull request overview

Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.

[mergennachin]

Running CI tests now

[pytorch-bot]

Workflows were awaiting approval. CI has now been triggered for the ciflow labels on this PR.

[Copilot]

Pull request overview

Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 15 out of 15 changed files in this pull request and generated 3 comments.

[CandiedCode]

@mergennachin can we rerun ci tests?

[Copilot]

Pull request overview

Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.

[Lorenzo-Mazza]

I could be wrong, but in the dependencies, I believe sklearn should be bumped to >=1.7.1, as 1.7.2 seems to be the first version to support python 3.14 (here)