xmlschema workflow (sissaschool/xmlschema)

The xmlschema workflow from sissaschool/xmlschema, explained and optimized by Latchkey.

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Source: sissaschool/xmlschema.github/workflows/test-xmlschema.ymlLicense MITView source

What it does

This is the xmlschema workflow from the sissaschool/xmlschema 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: xmlschema

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

jobs:
  build:

    runs-on:  ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t", "3.15.0-beta.3", "pypy-3.10", "pypy-3.11"]
        exclude:
          - os: macos-latest
            python-version: "3.10"
          - os: windows-latest
            python-version: "3.10"

    steps:
      - uses: actions/checkout@v6
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v6
        with:
          python-version: ${{ matrix.python-version }}
      - name: Install pip and setuptools
        run: |
          python -m pip install --upgrade pip
          pip install setuptools
      - name: Install lxml optional dependency
        if: |
          matrix.python-version != '3.15.0-beta.3' && 
          matrix.python-version != 'pypy-3.10' &&
          matrix.python-version != 'pypy-3.11' &&
          matrix.python-version != '3.14t'
        run: |
          pip install lxml
      - name: Install lxml optional dependency for PyPy 3.10 on Ubuntu
        if: |
          matrix.os == 'ubuntu-latest' && 
          matrix.python-version != 'pypy-3.10'
        run: |
          sudo apt install -y libxml2-dev libxslt-dev python3-dev
          pip install lxml
      - name: Install other optional dependencies
        run: pip install jinja2
      - name: Test with unittest
        run: |
          pip install .
          python -m unittest
      - name: Lint with flake8
        run: |
          pip install flake8
          flake8 xmlschema --max-line-length=100 --statistics
      - name: Lint with mypy==2.1.0
        if: ${{ matrix.python-version != 'pypy-3.10' && matrix.python-version != 'pypy-3.11' }}
        run: |
          pip install mypy==2.1.0 xmlschema lxml-stubs
          mypy --show-error-codes --strict xmlschema

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: xmlschema
 
on:
  push:
    branches: [master, develop]
  pull_request:
    branches: [master, develop]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
 
    runs-on:  ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t", "3.15.0-beta.3", "pypy-3.10", "pypy-3.11"]
        exclude:
          - os: macos-latest
            python-version: "3.10"
          - os: windows-latest
            python-version: "3.10"
 
    steps:
      - uses: actions/checkout@v6
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v6
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
      - name: Install pip and setuptools
        run: |
          python -m pip install --upgrade pip
          pip install setuptools
      - name: Install lxml optional dependency
        if: |
          matrix.python-version != '3.15.0-beta.3' && 
          matrix.python-version != 'pypy-3.10' &&
          matrix.python-version != 'pypy-3.11' &&
          matrix.python-version != '3.14t'
        run: |
          pip install lxml
      - name: Install lxml optional dependency for PyPy 3.10 on Ubuntu
        if: |
          matrix.os == 'ubuntu-latest' && 
          matrix.python-version != 'pypy-3.10'
        run: |
          sudo apt install -y libxml2-dev libxslt-dev python3-dev
          pip install lxml
      - name: Install other optional dependencies
        run: pip install jinja2
      - name: Test with unittest
        run: |
          pip install .
          python -m unittest
      - name: Lint with flake8
        run: |
          pip install flake8
          flake8 xmlschema --max-line-length=100 --statistics
      - name: Lint with mypy==2.1.0
        if: ${{ matrix.python-version != 'pypy-3.10' && matrix.python-version != 'pypy-3.11' }}
        run: |
          pip install mypy==2.1.0 xmlschema lxml-stubs
          mypy --show-error-codes --strict xmlschema

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 (27 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