- uses: actions/checkout@v2

- uses: actions/setup-python@v2

with:

- run: python my_script.py

- Your runner needs to be running with administrator privileges so that the appropriate directories and files can be set up when downloading and installing a new version of Python for the first time.

- You need `7zip` installed and added to your `PATH` so that the downloaded versions of Python files can be extracted properly during first-time setup.

- MSI installers are used when setting up Python on Windows. A word of caution as MSI installers update registry settings.

- The 3.8 MSI installer for Windows will not let you install another 3.8 version of Python. If `setup-python` fails for a 3.8 version of Python, make sure any previously installed versions are removed by going to "Apps & Features" in the Settings app.

- The runner can be granted write access to the `/opt/hostedtoolcache` directory using a few techniques:

- The user starting the runner is the owner, and the owner has write permission

- The user starting the runner is in the owning group, and the owning group has write permission

- One quick way to grant access is to change the user and group of `/opt/hostedtoolcache` to be the same as the runners using `chown`

- `sudo chown runner-user:runner-group opt/hostedtoolcache/`

- If your runner is configured as a service and you run into problems, make sure the user that the service is running as is correct. For more information, you can [check the status of your self-hosted runner](https://help.github.com/en/actions/hosting-your-own-runners/configuring-the-self-hosted-runner-application-as-a-service#checking-the-status-of-the-service).