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Static code analysis workflow (python-lsp/python-lsp-server)

The Static code analysis workflow from python-lsp/python-lsp-server, explained and optimized by Latchkey.

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Source: python-lsp/python-lsp-server.github/workflows/static.ymlLicense MITView source

What it does

This is the Static code analysis workflow from the python-lsp/python-lsp-server 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: Static code analysis

on:
  push:
    branches:
      - develop

  pull_request:
    branches:
      - '*'

concurrency:
  group: static-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:
    name: Static code analysis
    runs-on: ubuntu-latest
    env:
      CI: 'true'
      OS: 'linux'
    timeout-minutes: 2
    steps:
      - uses: actions/cache@v4
        with:
          path: ~/.cache/pip
          key: static-pip-${{ hashFiles('pyproject.toml') }}
          restore-keys: static-pip-
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: '3.9'
          architecture: 'x64'
      - run: python -m pip install --upgrade pip setuptools jsonschema
      # If we don't install pycodestyle, pylint will throw an unused-argument error in pylsp/plugins/pycodestyle_lint.py:72
      # This error cannot be resolved by adding a pylint: disable=unused-argument comment ...
      - run: |
          pip install -e .[pylint,pycodestyle]
          pip install ruff==0.9.4
      - name: ruff linter and code style checks
        run: ruff check pylsp test
      - name: ruff code formatter check
        run: ruff format --check pylsp test
      - name: Validate JSON schema
        run: echo {} | jsonschema pylsp/config/schema.json
      - name: Ensure JSON schema and Markdown docs are in sync
        run: |
          python scripts/jsonschema2md.py pylsp/config/schema.json EXPECTED_CONFIGURATION.md
          diff EXPECTED_CONFIGURATION.md CONFIGURATION.md

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: Static code analysis
 
on:
  push:
    branches:
      - develop
 
  pull_request:
    branches:
      - '*'
 
concurrency:
  group: static-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    name: Static code analysis
    runs-on: latchkey-small
    env:
      CI: 'true'
      OS: 'linux'
    timeout-minutes: 2
    steps:
      - uses: actions/cache@v4
        with:
          path: ~/.cache/pip
          key: static-pip-${{ hashFiles('pyproject.toml') }}
          restore-keys: static-pip-
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: '3.9'
          architecture: 'x64'
      - run: python -m pip install --upgrade pip setuptools jsonschema
      # If we don't install pycodestyle, pylint will throw an unused-argument error in pylsp/plugins/pycodestyle_lint.py:72
      # This error cannot be resolved by adding a pylint: disable=unused-argument comment ...
      - run: |
          pip install -e .[pylint,pycodestyle]
          pip install ruff==0.9.4
      - name: ruff linter and code style checks
        run: ruff check pylsp test
      - name: ruff code formatter check
        run: ruff format --check pylsp test
      - name: Validate JSON schema
        run: echo {} | jsonschema pylsp/config/schema.json
      - name: Ensure JSON schema and Markdown docs are in sync
        run: |
          python scripts/jsonschema2md.py pylsp/config/schema.json EXPECTED_CONFIGURATION.md
          diff EXPECTED_CONFIGURATION.md CONFIGURATION.md

What changed

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:

This workflow runs 1 job 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/cache actions/checkout actions/setup-python