Speed up CI with uv ⚡

We can use uv to make linting and testing on GitHub Actions around 1.5 times as fast.

Linting

When using pre-commit for linting:

name: Lint

on: [push, pull_request, workflow_dispatch]

env:
  FORCE_COLOR: 1

permissions:
  contents: read

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false
      - uses: actions/setup-python@v5
        with:
          python-version: "3.x"
          cache: pip
      - uses: pre-commit/action@v3.0.1

We can replace pre-commit/action with tox-dev/action-pre-commit-uv:

       - uses: actions/setup-python@v5
         with:
           python-version: "3.x"
-          cache: pip
-      - uses: pre-commit/action@v3.0.1
+      - uses: tox-dev/action-pre-commit-uv@v1

name: Lint

on: [push, pull_request, workflow_dispatch]

env:
  FORCE_COLOR: 1

permissions:
  contents: read

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false
      - uses: actions/setup-python@v5
        with:
          python-version: "3.x"
      - uses: tox-dev/action-pre-commit-uv@v1

This means uv will create virtual environments and install packages for pre-commit, which is faster for the initial seed operation when there's no cache.

Lint comparison

For example: python/blurb#32

	Before	After	Times faster
No cache	60s	37s	1.62
With cache	11s	11s	1.00

Testing

When testing with tox:

name: Test

on: [push, pull_request, workflow_dispatch]

permissions:
  contents: read

env:
  FORCE_COLOR: 1

jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]

    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}
          allow-prereleases: true
          cache: pip

      - name: Install dependencies
        run: |
          python --version
          python -m pip install -U pip
          python -m pip install -U tox

      - name: Tox tests
        run: |
          tox -e py

We can replace tox with tox-uv:

       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
-          cache: pip

-      - name: Install dependencies
-        run: |
-          python --version
-          python -m pip install -U pip
-          python -m pip install -U tox
+      - name: Install uv
+        uses: hynek/setup-cached-uv@v2

       - name: Tox tests
         run: |
-          tox -e py
+          uvx --with tox-uv tox -e py

name: Test

on: [push, pull_request, workflow_dispatch]

permissions:
  contents: read

env:
  FORCE_COLOR: 1

jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]

    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}
          allow-prereleases: true

      - name: Install uv
        uses: hynek/setup-cached-uv@v2

      - name: Tox tests
        run: |
          uvx --with tox-uv tox -e py

tox-uv is tox plugin to replace virtualenv and pip with uv in your tox environments. We only need to install uv, and use uvx to both install tox-uv and run tox, for faster installs of tox, the virtual environment, and the dependencies within it.

Test comparison

For example: python/blurb#32

	Before	After	Times faster
No cache	2m 0s	1m 26s	1.40
With cache	1m 58s	1m 22s	1.44

Bonus tip

Run the new tool zizmor to find security issues in GitHub Actions.

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Header photo: "Road cycling at the 1952 Helsinki Olympics" by Olympia-Kuva Oy & Helsinki City Museum, Public Domain.

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