mirror of
https://github.com/actions/setup-python.git
synced 2024-11-05 23:45:49 -05:00
102 lines
4.2 KiB
Markdown
102 lines
4.2 KiB
Markdown
# setup-python
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<p align="left">
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<a href="https://github.com/actions/setup-python"><img alt="GitHub Actions status" src="https://github.com/actions/setup-python/workflows/Main%20workflow/badge.svg"></a>
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</p>
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This action sets up a Python environment for use in actions by:
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- optionally installing a version of Python and adding to PATH. Note that this action only uses versions of Python already installed in the cache. The action will fail if no matching versions are found.
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- registering problem matchers for error output
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# Usage
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See [action.yml](action.yml)
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Basic:
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```yaml
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steps:
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- uses: actions/checkout@v1
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- uses: actions/setup-python@v1
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with:
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python-version: '3.x' # Version range or exact version of a Python version to use, using semvers version range syntax.
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architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
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- run: python my_script.py
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```
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Matrix Testing:
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```yaml
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jobs:
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build:
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runs-on: ubuntu-latest
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strategy:
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matrix:
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python-version: [ '2.x', '3.x', 'pypy2', 'pypy3' ]
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name: Python ${{ matrix.python-version }} sample
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steps:
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- uses: actions/checkout@v1
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- name: Setup python
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uses: actions/setup-python@v1
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with:
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python-version: ${{ matrix.python-version }}
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architecture: x64
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- run: python my_script.py
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```
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Exclude a specific Python version:
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```yaml
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jobs:
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build:
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runs-on: ubuntu-latest
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strategy:
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matrix:
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os: [ubuntu-latest, macos-latest, windows-latest]
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python-version: [2.7, 3.6, 3.7, 3.8, pypy2, pypy3]
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exclude:
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- os: macos-latest
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python-version: 3.8
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- os: windows-latest
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python-version: 3.6
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steps:
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- uses: actions/checkout@v1
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- name: Set up Python
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uses: actions/setup-python@v1
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with:
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python-version: ${{ matrix.python-version }}
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- name: Display Python version
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run: python -c "import sys; print(sys.version)"
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```
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# Getting started with Python + Actions
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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).
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# Hosted Tool Cache
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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.
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|| Location |
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|------|-------|
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|**Tool Cache Directory** |`RUNNER_TOOL_CACHE`|
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|**Python Tool Cache**|`RUNNER_TOOL_CACHE/Python/*`|
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|**PyPy Tool Cache**|`RUNNER_TOOL_CACHE/PyPy/*`|
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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.
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- [Tools cache setup for Ubuntu](https://github.com/actions/virtual-environments/blob/master/images/linux/scripts/installers/1804/hosted-tool-cache.sh)
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- [Tools cache setup for Windows](https://github.com/actions/virtual-environments/blob/master/images/win/scripts/Installers/Download-ToolCache.ps1)
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# Using Python without `setup-python`
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`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`.
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# Available versions of Python
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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)
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# License
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The scripts and documentation in this project are released under the [MIT License](LICENSE)
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# Contributions
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Contributions are welcome! See [Contributor's Guide](docs/contributors.md)
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