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Update README.md

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Konrad Pabjan 2019-12-23 11:51:09 -05:00 committed by GitHub
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@ -28,7 +28,7 @@ Matrix Testing:
```yaml
jobs:
build:
runs-on: ubuntu-16.04
runs-on: ubuntu-latest
strategy:
matrix:
python-version: [ '2.x', '3.x', 'pypy2', 'pypy3' ]
@ -42,6 +42,53 @@ jobs:
architecture: x64
- run: python my_script.py
```
Exclude a specific Python version:
```yaml
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
os: [ubuntu-latest, macos-latest, windows-latest]
python-version: [2.7, 3.6, 3.7, 3.8, pypy2, pypy3]
exclude:
- os: macos-latest
python-version: 3.8
- os: windows-latest
python-version: 3.6
steps:
- uses: actions/checkout@v1
- name: Set up Python
uses: actions/setup-python@v1
with:
python-version: ${{ matrix.python-version }}
- name: Display Python version
run: python -c "import sys; print(sys.version)"
```
# Getting started with Python + Actions
Check out our detailed guide on using [Python with GitHub Actions](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/using-python-with-github-actions).
# Hosted Tool Cache
GitHub hosted runners have a tools cache that comes with Python + PyPy already installed. This tools cache helps speed up runs and tool setup by not requiring any new downloads. There is an environment variable called `RUNNER_TOOL_CACHE` on each runner that describes the location of this tools cache and there is where you will find Python and PyPy installed. `setup-python` works by taking a specific version of Python or PyPy in this tools cache and adding it to PATH.
|| Location |
|------|-------|
|**Tool Cache Directory** |`RUNNER_TOOL_CACHE`|
|**Python Tool Cache**|`RUNNER_TOOL_CACHE/Python/*`|
|**PyPy Tool Cache**|`RUNNER_TOOL_CACHE/PyPy/*`|
GitHub virtual environments are setup in [actions/virtual-environments](https://github.com/actions/virtual-environments). During the setup, the available versions of Python and PyPy are automatically downloaded, setup and documented.
- [Tools cache setup for Ubuntu](https://github.com/actions/virtual-environments/blob/master/images/linux/scripts/installers/1804/hosted-tool-cache.sh)
- [Tools cache setup for Windows](https://github.com/actions/virtual-environments/blob/master/images/win/scripts/Installers/Download-ToolCache.ps1)
# Using Python without `setup-python`
`setup-python` helps keep your dependencies explicit and ensures consistent behavior between different runners. If you use `python` in a shell on a GitHub hosted runner without `setup-python` it will default to whatever is in PATH. The default version of Python in PATH vary between runners and can change unexpectedly so we recommend you always use `setup-python`.
# Available versions of Python
For detailed information regarding the available versions of Python that are installed see [Software installed on GitHub-hosted runners](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/software-installed-on-github-hosted-runners)