This action sets up a Python environment for use in actions by:

• optionally installing and adding to PATH a version of Python that is already installed in the tools cache.
• downloading, installing and adding to PATH an available version of Python from GitHub Releases (actions/python-versions) if a specific version is not available in the tools cache.
• failing if a specific version of Python is not preinstalled or available for download.
• registering problem matchers for error output.

• Ability to download, install and set up Python packages from actions/python-versions that do not come preinstalled on runners.
  • Allows for pinning to a specific patch version of Python without the worry of it ever being removed or changed.
• Automatic setup and download of Python packages if using a self-hosted runner.
• Support for pre-release versions of Python.

See action.yml

Basic:

steps:
- uses: actions/checkout@v2
- uses: actions/setup-python@v2
  with:
    python-version: '3.x' # Version range or exact version of a Python version to use, using SemVer's version range syntax
    architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
- run: python my_script.py

Matrix Testing:

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: [ '2.x', '3.x', 'pypy2', 'pypy3' ]
    name: Python ${{ matrix.python-version }} sample
    steps:
      - uses: actions/checkout@v2
      - name: Setup python