Python package workflow (jitsi/jiwer)

The Python package workflow from jitsi/jiwer, explained and optimized by Latchkey.

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Source: jitsi/jiwer.github/workflows/pythonpackage.ymlLicense Apache-2.0View source

What it does

This is the Python package workflow from the jitsi/jiwer repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

name: Python package

on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]

jobs:
  style:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: ["3.10"]

    steps:
    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744  # v3

    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@7f4fc3e22c37d6ff65e88745f38bd3157c663f7c  # v4
      with:
        python-version: ${{ matrix.python-version }}

    - name: Install uv
      uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86  # v5
      with:
        # Install a specific version of uv.
        version: "0.5.26"

    - name: Setup dependencies
      run: |
        uv sync --all-extras --all-groups

    - name: Lint with ruff
      run: |
        uv run ruff check .

    - name: Check formatting with ruff
      run: |
        uv run ruff format . --diff

  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]

    steps:
    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744  # v3

    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@7f4fc3e22c37d6ff65e88745f38bd3157c663f7c  # v4
      with:
        python-version: ${{ matrix.python-version }}

    - name: Install uv
      uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86  # v5
      with:
        # Install a specific version of uv.
        version: "0.5.26"

    - name: Install dependencies
      run: |
        uv sync --all-extras --all-groups

    - name: Test with pytest
      run: |
        uv run python --version
        uv run pytest

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
name: Python package
 
on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  style:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      matrix:
        python-version: ["3.10"]
 
    steps:
    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744  # v3
 
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@7f4fc3e22c37d6ff65e88745f38bd3157c663f7c  # v4
      with:
        cache: 'pip'
        python-version: ${{ matrix.python-version }}
 
    - name: Install uv
      uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86  # v5
      with:
        # Install a specific version of uv.
        version: "0.5.26"
 
    - name: Setup dependencies
      run: |
        uv sync --all-extras --all-groups
 
    - name: Lint with ruff
      run: |
        uv run ruff check .
 
    - name: Check formatting with ruff
      run: |
        uv run ruff format . --diff
 
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      matrix:
        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 
    steps:
    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744  # v3
 
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@7f4fc3e22c37d6ff65e88745f38bd3157c663f7c  # v4
      with:
        cache: 'pip'
        python-version: ${{ matrix.python-version }}
 
    - name: Install uv
      uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86  # v5
      with:
        # Install a specific version of uv.
        version: "0.5.26"
 
    - name: Install dependencies
      run: |
        uv sync --all-extras --all-groups
 
    - name: Test with pytest
      run: |
        uv run python --version
        uv run pytest

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
Cancel superseded runs when a branch or PR gets a newer push.
Cache dependency installs on the setup step so they are served from cache.
Add a job timeout so a hung step cannot burn hours of runner time.

This workflow runs 2 jobs (7 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout actions/setup-python astral-sh/setup-uv