pytest:py3 workflow (beelit94/python-terraform)

The pytest:py3 workflow from beelit94/python-terraform, explained and optimized by Latchkey.

What it does

This is the pytest:py3 workflow from the beelit94/python-terraform 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

name: "pytest:py3 "

on:
  push:
    branches:
      - '**'
  pull_request:
    branches: [ master ]
    
  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

jobs:
  build:

    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        python-version: [3.7, 3.8, 3.9]
        os: [ubuntu-latest, macOS-latest]

    steps:
    - uses: actions/checkout@v2
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v2
      with:
        python-version: ${{ matrix.python-version }}
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install -r requirements_dev.txt
    - name: Test with pytest
      run: |
        PYTHONPATH=. python -m pytest -v -s --cache-clear --cov=python-terraform test

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: "pytest:py3 "
 
on:
  push:
    branches:
      - '**'
  pull_request:
    branches: [ master ]
    
  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
 
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        python-version: [3.7, 3.8, 3.9]
        os: [ubuntu-latest, macOS-latest]
 
    steps:
    - uses: actions/checkout@v2
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v2
      with:
        cache: 'pip'
        python-version: ${{ matrix.python-version }}
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install -r requirements_dev.txt
    - name: Test with pytest
      run: |
        PYTHONPATH=. python -m pytest -v -s --cache-clear --cov=python-terraform test
 

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• Cancel superseded runs when a branch or PR gets a newer push.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