Python package workflow (havakv/pycox)

The Python package workflow from havakv/pycox, explained and optimized by Latchkey.

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Source: havakv/pycox.github/workflows/pythonpackage.ymlLicense BSD-2-ClauseView source

What it does

This is the Python package workflow from the havakv/pycox repository, a real project running GitHub Actions. It is shown here with attribution under its BSD-2-Clause license.

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

The workflow

workflow (.yml)

name: Python package

on:
  push:
    branches:
      - master
  pull_request:

jobs:
  build_test:
    name: Test on ${{ matrix.config.os }} with Python ${{ matrix.python-version }}
    runs-on: ${{ matrix.config.os }}
    strategy:
      max-parallel: 4
      fail-fast: false
      matrix:
        python-version: ['3.8', '3.9', '3.10']
        config:
        - { os: ubuntu-latest, torch-version: "torch --index-url https://download.pytorch.org/whl/cpu"}
        - { os: windows-latest, torch-version: "torch"} 
        - { os: macOS-latest, torch-version: "torch"}
    steps:
    - uses: actions/checkout@v4
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v5
      with:
        python-version: ${{ matrix.python-version }}
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install ${{ matrix.config.torch-version }}
        # python setup.py install
        pip install .
        pip install -r requirements-dev.txt
    - name: Lint with flake8
      run: |
        pip install flake8
        # stop the build if there are Python syntax errors or undefined names
        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
    - name: Test with pytest
      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.

name: Python package
 
on:
  push:
    branches:
      - master
  pull_request:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build_test:
    timeout-minutes: 30
    name: Test on ${{ matrix.config.os }} with Python ${{ matrix.python-version }}
    runs-on: ${{ matrix.config.os }}
    strategy:
      max-parallel: 4
      fail-fast: false
      matrix:
        python-version: ['3.8', '3.9', '3.10']
        config:
        - { os: ubuntu-latest, torch-version: "torch --index-url https://download.pytorch.org/whl/cpu"}
        - { os: windows-latest, torch-version: "torch"} 
        - { os: macOS-latest, torch-version: "torch"}
    steps:
    - uses: actions/checkout@v4
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v5
      with:
        cache: 'pip'
        python-version: ${{ matrix.python-version }}
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install ${{ matrix.config.torch-version }}
        # python setup.py install
        pip install .
        pip install -r requirements-dev.txt
    - name: Lint with flake8
      run: |
        pip install flake8
        # stop the build if there are Python syntax errors or undefined names
        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
    - name: Test with pytest
      run: |
        pytest

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 (9 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