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Merged
cclauss merged 7 commits into from
Aug 31, 2026
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CI: Upgrade to free-threaded Python 3.14t #15104

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a9fc9e3
ci: switch default Python to free-threaded 3.14t
priya-sundaram-dev Aug 28, 2026
265c8a7
ci(3.14t): gate opencv-python into optional 'cv' group + skip cv2 files
priya-sundaram-dev Aug 28, 2026
53d6a74
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Aug 28, 2026
981259c
ci(3.14t): add --ignore-gil-enabled so sklearn/xgboost imports don't …
priya-sundaram-dev Aug 28, 2026
c12f697
ci(3.14t): gate qiskit into an optional group like opencv
priya-sundaram-dev Aug 31, 2026
09d228b
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Aug 31, 2026
64e8e32
ci: single-source 3.14t via .python-version; declare Free Threading :…
priya-sundaram-dev Aug 31, 2026
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21 changes: 19 additions & 2 deletions .github/workflows/build.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -17,18 +17,35 @@ jobs:
cache-dependency-glob: uv.lock
- uses: actions/setup-python@v7
with:
python-version-file: pyproject.toml
python-version: 3.14t

@cclauss cclauss Aug 28, 2026

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Let's make this change in all workflows that use actions/setup-python.

Suggested change
python-version: 3.14t
python-version-file: 'pyproject.toml'

This will make the diffs smaller in PRs like this one and:

allow-prereleases: true
- run: uv sync --group=test
- name: Run tests
# opencv-python is gated out on 3.14t (no cp314t wheel yet), so skip the
# files that import cv2. Pure-Python algorithms in computer_vision/ and
# data_compression/ still run; digital_image_processing/ is almost entirely
# cv2-based so it is skipped as a tree. Re-enable when a cp314t wheel ships.
# --ignore-gil-enabled: some compiled deps (sklearn, xgboost, ...) don't
# yet ship the Py_mod_gil slot, so importing them re-enables the GIL under
# 3.14t. That's an upstream-wheel gap, not our code; the flag lets the suite
# run anyway and pytest-run-parallel still reports which tests are not
# thread-safe. Drop the flag once the scientific stack ships free-threaded wheels.
# qiskit is likewise gated out of the 3.14t deps (Qiskit/qiskit#16893), so the
# single file that imports it (quantum/q_fourier_transform.py) is skipped too.
run: uv run --with=pytest-run-parallel pytest
--iterations=8 --parallel-threads=auto
--iterations=8 --parallel-threads=auto --ignore-gil-enabled
--ignore=computer_vision/cnn_classification.py
--ignore=computer_vision/flip_augmentation.py
--ignore=computer_vision/harris_corner.py
--ignore=computer_vision/mosaic_augmentation.py
--ignore=data_compression/peak_signal_to_noise_ratio.py
--ignore=digital_image_processing/
--ignore=docs/conf.py
--ignore=dynamic_programming/k_means_clustering_tensorflow.py
--ignore=machine_learning/lstm/lstm_prediction.py
--ignore=neural_network/input_data.py
--ignore=project_euler/
--ignore=quantum/q_fourier_transform.py
--ignore=scripts/validate_solutions.py
--ignore=web_programming/current_stock_price.py
--ignore=web_programming/fetch_anime_and_play.py
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2 changes: 1 addition & 1 deletion .github/workflows/directory_writer.yml
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Expand Up @@ -11,7 +11,7 @@ jobs:
fetch-depth: 0
- uses: actions/setup-python@v7
with:
python-version-file: pyproject.toml
python-version: 3.14t
allow-prereleases: true
- name: Write DIRECTORY.md
run: |
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4 changes: 2 additions & 2 deletions .github/workflows/project_euler.yml
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Expand Up @@ -25,7 +25,7 @@ jobs:
- uses: astral-sh/setup-uv@v7
- uses: actions/setup-python@v7
with:
python-version-file: pyproject.toml
python-version: 3.14t
allow-prereleases: true
- run: uv sync --group=euler-validate --group=test
- run: uv run pytest --doctest-modules --cov-report=term-missing:skip-covered --cov=project_euler/ project_euler/
Expand All @@ -43,7 +43,7 @@ jobs:
- uses: astral-sh/setup-uv@v7
- uses: actions/setup-python@v7
with:
python-version-file: pyproject.toml
python-version: 3.14t
allow-prereleases: true
- run: uv sync --group=euler-validate --group=test
- run: uv run pytest scripts/validate_solutions.py
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2 changes: 1 addition & 1 deletion .github/workflows/sphinx.yml
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Expand Up @@ -36,7 +36,7 @@ jobs:
- uses: astral-sh/setup-uv@v7
- uses: actions/setup-python@v7
with:
python-version-file: pyproject.toml
python-version: 3.14t
allow-prereleases: true
- run: uv sync --group=docs
- uses: actions/configure-pages@v6
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19 changes: 17 additions & 2 deletions pyproject.toml
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Expand Up @@ -18,10 +18,8 @@ dependencies = [
"lxml>=6",
"matplotlib>=3.9.3",
"numpy>=2.1.3",
"opencv-python>=4.10.0.84",
"pandas>=2.3.3",
"pillow>=11.3",
"qiskit>=2",
"rich>=13.9.4",
"scikit-learn>=1.5.2",
"scipy>=1.16.2",
Expand All @@ -42,10 +40,27 @@ docs = [
"sphinx>=8.2",
"sphinx-autoapi>=3.4",
]
# opencv-python has no free-threaded (cp314t) wheel yet and fails to build from
# source under 3.14t (CMake), which blocks `uv sync` for every job. Keep it in an
# optional group so the free-threaded CI can install everything else and actually
# run pytest-run-parallel on the pure-Python algorithms. Re-fold into core deps
# once a cp314t wheel ships (upstream: opencv/opencv#27933).
cv = [
"opencv-python>=4.10.0.84",
]
euler-validate = [
"httpx>=0.28.1",
"numpy>=2.1.3",
]
# qiskit does not yet run on free-threaded CPython: its compiled core re-enables
# the GIL under 3.14t and the team is still scoping free-threading support
# (upstream: Qiskit/qiskit#16893). Keep it in an optional group so the
# free-threaded CI can install everything else; only quantum/q_fourier_transform.py
# imports it, and that file is ignored in the 3.14t test run. Re-fold into core
# deps once qiskit supports free-threading.
quantum = [
"qiskit>=2",
]

[tool.ruff]
target-version = "py314"

@cclauss cclauss Aug 31, 2026

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Suggested change
target-version = "py314"
target-version = "py314t"

and restore python-version-file: pyproject.toml in all workflows.

@priya-sundaram-dev priya-sundaram-dev Aug 31, 2026

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Both of these turn out to be blocked by tooling constraints rather than choices, so I left them as-is — details below in case it's useful:

target-version = "py314t" — ruff doesn't accept a free-threaded target. On ruff 0.15.21:

$ ruff check --config 'target-version = "py314t"' .
unknown variant `py314t`, expected one of `py37`, `py38`, `py39`, `py310`, `py311`, `py312`, `py313`, `py314`, `py315`

target-version is the language version (it gates which syntax/lint rules apply), and free-threading doesn't change the language — 3.14 and 3.14t parse identically. So py314 is correct here and py314t would fail the config parse in every ruff run.

python-version-file: pyproject.toml — setup-python resolves that file via project.requires-python, which is semver, and 3.14t isn't valid semver (see actions/setup-python#973 — the t suffix is pyenv/wheel notation, not semver). So requires-python = ">=3.14" would install the GIL build, not the free-threaded one, which defeats the PR. The only version-file that can carry 3.14t is .python-version, but that's gitignored here (.gitignore:76) by convention so contributors can keep a local pin without committing it. That's why I used the explicit python-version: 3.14t — it's the minimal way to actually select the free-threaded interpreter in CI.

If you'd rather single-source it across the 4 workflows anyway, I'm happy to un-ignore .python-version, pin it to 3.14t, and switch them all to python-version-file: .python-version — that keeps the diffs small and gives one place to bump. Just let me know if the gitignore-convention change is worth it to you and I'll push it.

@cclauss cclauss Aug 31, 2026

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Nice detective work!! Please un-ignore .python-version, pin it to 3.14t, and switch them all to python-version-file: .python-version.

Also, we should declare that we are free-threaded beta https://py-free-threading.github.io/porting/#define-and-document-thread-safety-guarantees

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