Python CI workflow (kaifcodec/ytconverter)

The Python CI workflow from kaifcodec/ytconverter, explained and optimized by Latchkey.

CI health: D - needs work

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Source: kaifcodec/ytconverter.github/workflows/python-ci.ymlLicense MITView source

What it does

This is the Python CI workflow from the kaifcodec/ytconverter 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: Python CI

on:
  push:
   branches: [ main ]
  pull_request:
    branches: [ main ]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4

    - name: Set up Python
      uses: actions/setup-python@v5
      with:
        python-version: '3.9'

    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install colored fontstyle httpx yt-dlp

    - name: Check syntax of ytconverter.py
      run: python -m py_compile standalone/ytconverter.py

  test-on-windows:
    runs-on: windows-latest
    needs: build
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4

    - name: Set up Python
      uses: actions/setup-python@v5
      with:
        python-version: '3.9'

    - name: Install dependencies
      shell: bash
      run: |
        python -m pip install --upgrade pip
        pip install colored fontstyle httpx yt-dlp

    - name: Create dummy data.json
      shell: bash
      run: |
        echo "{\"Name\": \"CI User\", \"Num\": \"ci@example.com\"}" > data.json

    - name: Install ffmpeg (Windows)
      shell: pwsh
      run: |
        choco install ffmpeg -y

    - name: Check for ffmpeg (Windows)
      shell: pwsh
      run: |
        ffmpeg -version

    - name: Test Single MP3 Download
      shell: bash
      run: |
        echo "Starting Single MP3 Download Test"
        printf "n\nn\nn\n1\nhttp://www.youtube.com/watch?v=dQw4w9WgXcQ\n0\n\n" | python3 standalone/ytconverter.py
        echo "Single MP3 Download Test Finished"

    - name: Test Single MP4 Download
      shell: bash
      run: |
        echo "Starting Single MP4 Download Test"
        printf "\n2\nhttp://www.youtube.com/watch?v=dQw4w9WgXcQ\n1\n\n" | python3 standalone/ytconverter.py
        echo "Single MP4 Download Test Finished"

    - name: Test Multiple MP4 Download
      shell: bash
      run: |
        echo "Starting Multiple MP4 Download Test"
        printf "n\nn\nn\n3\nhttp://www.youtube.com/watch?v=dQw4w9WgXcQ\n0\n1\n\n" | python3 standalone/ytconverter.py
        echo "Multiple MP4 Download Test Finished"

    - name: Test Exit Option
      shell: bash
      run: |
        echo "Starting Exit Option Test"
        printf "n\nn\nn\n4\n" | python3 standalone/ytconverter.py
        echo "Exit Option Test Finished"

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 CI
 
on:
  push:
   branches: [ main ]
  pull_request:
    branches: [ main ]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4
 
    - name: Set up Python
      uses: actions/setup-python@v5
      with:
        cache: 'pip'
        python-version: '3.9'
 
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install colored fontstyle httpx yt-dlp
 
    - name: Check syntax of ytconverter.py
      run: python -m py_compile standalone/ytconverter.py
 
  test-on-windows:
    timeout-minutes: 30
    runs-on: windows-latest
    needs: build
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4
 
    - name: Set up Python
      uses: actions/setup-python@v5
      with:
        cache: 'pip'
        python-version: '3.9'
 
    - name: Install dependencies
      shell: bash
      run: |
        python -m pip install --upgrade pip
        pip install colored fontstyle httpx yt-dlp
 
    - name: Create dummy data.json
      shell: bash
      run: |
        echo "{\"Name\": \"CI User\", \"Num\": \"ci@example.com\"}" > data.json
 
    - name: Install ffmpeg (Windows)
      shell: pwsh
      run: |
        choco install ffmpeg -y
 
    - name: Check for ffmpeg (Windows)
      shell: pwsh
      run: |
        ffmpeg -version
 
    - name: Test Single MP3 Download
      shell: bash
      run: |
        echo "Starting Single MP3 Download Test"
        printf "n\nn\nn\n1\nhttp://www.youtube.com/watch?v=dQw4w9WgXcQ\n0\n\n" | python3 standalone/ytconverter.py
        echo "Single MP3 Download Test Finished"
 
    - name: Test Single MP4 Download
      shell: bash
      run: |
        echo "Starting Single MP4 Download Test"
        printf "\n2\nhttp://www.youtube.com/watch?v=dQw4w9WgXcQ\n1\n\n" | python3 standalone/ytconverter.py
        echo "Single MP4 Download Test Finished"
 
    - name: Test Multiple MP4 Download
      shell: bash
      run: |
        echo "Starting Multiple MP4 Download Test"
        printf "n\nn\nn\n3\nhttp://www.youtube.com/watch?v=dQw4w9WgXcQ\n0\n1\n\n" | python3 standalone/ytconverter.py
        echo "Multiple MP4 Download Test Finished"
 
    - name: Test Exit Option
      shell: bash
      run: |
        echo "Starting Exit Option Test"
        printf "n\nn\nn\n4\n" | python3 standalone/ytconverter.py
        echo "Exit Option Test Finished"

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.

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 2 jobs 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