Continuous Integration workflow (pyparsing/pyparsing)

The Continuous Integration workflow from pyparsing/pyparsing, explained and optimized by Latchkey.

CI health: D - needs work

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Source: pyparsing/pyparsing.github/workflows/ci.ymlLicense MITView source

What it does

This is the Continuous Integration workflow from the pyparsing/pyparsing repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

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

The workflow

workflow (.yml)

name: Continuous Integration
on:
  push:
    branches:
      - master

  pull_request:
    paths:
      - .github/workflows/ci.yml
      - pyparsing/*
      - pyproject.toml
      - tox.ini

permissions:
  contents: read

jobs:
  tests:
    name: Unit tests
    runs-on: ${{ matrix.os || 'ubuntu-latest' }}
    strategy:
      matrix:
        os: ["ubuntu-latest"]
        toxenv: [py]
        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
        include:
          - python-version: "3.14"
            os: macos-latest
          - python-version: "3.12"
            toxenv: mypy-check
          - python-version: "pypy-3.9"
    env:
      TOXENV: ${{ matrix.toxenv || 'py' }}
    steps:
      - uses: actions/checkout@v5

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v6
        with:
          python-version: ${{ matrix.python-version }}

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          python -m pip install tox railroad-diagrams Jinja2

      - name: Test
        run: tox

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.

name: Continuous Integration
on:
  push:
    branches:
      - master
 
  pull_request:
    paths:
      - .github/workflows/ci.yml
      - pyparsing/*
      - pyproject.toml
      - tox.ini
 
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  tests:
    timeout-minutes: 30
    name: Unit tests
    runs-on: ${{ matrix.os || 'ubuntu-latest' }}
    strategy:
      matrix:
        os: ["ubuntu-latest"]
        toxenv: [py]
        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
        include:
          - python-version: "3.14"
            os: macos-latest
          - python-version: "3.12"
            toxenv: mypy-check
          - python-version: "pypy-3.9"
    env:
      TOXENV: ${{ matrix.toxenv || 'py' }}
    steps:
      - uses: actions/checkout@v5
 
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v6
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
 
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          python -m pip install tox railroad-diagrams Jinja2
 
      - name: Test
        run: tox

What changed

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.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

Dependency installs

This workflow runs 1 job (6 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