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# setup-python V4
# setup-python
<p align="left">
<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>
</p>
This action sets up a Python environment for use in actions by:
This action provides the following functionality for GitHub Actions users:
- 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](https://github.com/actions/python-versions/releases)) 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.
- optionally caching dependencies for pip, pipenv and poetry.
- registering problem matchers for error output.
- Installing a version of Python or PyPy and (by default) adding it to the PATH
- Optionally caching dependencies for pip, pipenv and poetry
- Registering problem matchers for error output
# What's new
- 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.
- Support for installing any version of PyPy on-flight
- Support for built-in caching of pip, pipenv and poetry dependencies
- Support for `.python-version` file
# Usage
## Basic usage
See [action.yml](action.yml)
Basic:
**Python**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
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
python-version: '3.10'
- run: python my_script.py
```
Read Python version from file:
**PyPy**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
- uses: actions/setup-python@v4
with:
python-version-file: '.python-version' # Read python version from a file
python-version: 'pypy3.9'
- run: python my_script.py
```
The `python-version` input is optional. If not supplied, the action will try to resolve the version from the default `.python-version` file. If the `.python-version` file doesn't exist Python or PyPy version from the PATH will be used. The default version of Python or PyPy in PATH varies between runners and can be changed unexpectedly so we recommend always using `setup-python`.
Matrix Testing:
```yaml
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
python-version: [ '2.x', '3.x', 'pypy2.7', 'pypy3.7', 'pypy3.8' ]
name: Python ${{ matrix.python-version }} sample
steps:
- uses: actions/checkout@v3
- name: Set up Python
uses: actions/setup-python@v4
with:
python-version: ${{ matrix.python-version }}
architecture: x64
- run: python my_script.py
```
The action will first check the local [tool cache](docs/advanced-usage.md#hosted-tool-cache) for a [semver](https://github.com/npm/node-semver#versions) match. If unable to find a specific version in the tool cache, the action will attempt to download a version of Python from [GitHub Releases](https://github.com/actions/python-versions/releases) and for PyPy from the official [PyPy's dist](https://downloads.python.org/pypy/).
Exclude a specific Python version:
```yaml
jobs:
build:
runs-on: ${{ matrix.os }}
strategy:
matrix:
os: [ubuntu-latest, macos-latest, windows-latest]
python-version: ['2.7', '3.7', '3.8', '3.9', '3.10', 'pypy2.7', 'pypy3.8']
exclude:
- os: macos-latest
python-version: '3.8'
- os: windows-latest
python-version: '3.6'
steps:
- uses: actions/checkout@v3
- name: Set up Python
uses: actions/setup-python@v4
with:
python-version: ${{ matrix.python-version }}
- name: Display Python version
run: python --version
```
For information regarding locally cached versions of Python or PyPy on GitHub hosted runners, check out [GitHub Actions Virtual Environments](https://github.com/actions/virtual-environments).
Download and set up a version of Python that does not come preinstalled on an image:
```yaml
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
# in this example, there is a newer version already installed, 3.7.7, so the older version will be downloaded
python-version: ['3.7.4', '3.8', '3.9', '3.10']
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: ${{ matrix.python-version }}
- run: python my_script.py
```
## Supported version syntax
Download and set up an accurate pre-release version of Python:
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.11.0-alpha.1'
- run: python my_script.py
```
The `python-version` input supports the [Semantic Versioning Specification](https://semver.org/) and some special version notations (e.g. `semver ranges`, `x.y-dev syntax`, etc.), for detailed examples please refer to the section: [Using python-version input](docs/advanced-usage.md#using-the-python-version-input) of the [Advanced usage](docs/advanced-usage.md) guide.
Download and set up the latest available version of Python (includes both pre-release and stable versions):
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.11.0-alpha - 3.11.0' # SemVer's version range syntax
- run: python my_script.py
```
## Supported architectures
Download and set up the latest patch version of Python (for specified major & minor versions):
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.11-dev'
- run: python my_script.py
```
Using `architecture` input it is possible to specify the required Python or PyPy interpreter architecture: `x86` or `x64`. If the input is not specified the architecture defaults to `x64`.
Download and set up the latest stable version of Python (for specified major version):
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.x'
- run: python my_script.py
```
## Caching packages dependencies
Download and set up PyPy:
The action has built-in functionality for caching and restoring dependencies. It uses [toolkit/cache](https://github.com/actions/toolkit/tree/main/packages/cache) under the hood for caching dependencies but requires less configuration settings. Supported package managers are `pip`, `pipenv` and `poetry`. The `cache` input is optional, and caching is turned off by default.
```yaml
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
python-version:
- 'pypy3.7' # the latest available version of PyPy that supports Python 3.7
- 'pypy3.7-v7.3.3' # Python 3.7 and PyPy 7.3.3
- 'pypy3.8' # the latest available version of PyPy that supports Python 3.8
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: ${{ matrix.python-version }}
- run: python my_script.py
```
More details on PyPy syntax and examples of using preview / nightly versions of PyPy can be found in the [Available versions of PyPy](#available-versions-of-pypy) section.
The action defaults to searching for a dependency file (`requirements.txt` for pip, `Pipfile.lock` for pipenv or `poetry.lock` for poetry) in the repository, and uses its hash as a part of the cache key. Input `cache-dependency-path` is used for cases when multiple dependency files are used, they are located in different subdirectories or different files for the hash that want to be used.
An output is available with the absolute path of the python interpreter executable if you need it:
```yaml
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
id: cp310
with:
python-version: "3.10"
- run: pipx run --python '${{ steps.cp310.outputs.python-path }}' nox --version
```
>The environment variable `pythonLocation` also becomes available after Python or PyPy installation. It contains the absolute path to the folder where the desired version of Python or PyPy is installed.
# 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).
# Available versions of Python
`setup-python` is able to configure Python from two sources:
- Preinstalled versions of Python in the tools cache on GitHub-hosted runners.
- For detailed information regarding the available versions of Python that are installed, see [Supported software](https://docs.github.com/en/actions/reference/specifications-for-github-hosted-runners#supported-software).
- For every minor version of Python, expect only the latest patch to be preinstalled.
- If `3.8.1` is installed for example, and `3.8.2` is released, expect `3.8.1` to be removed and replaced by `3.8.2` in the tools cache.
- If the exact patch version doesn't matter to you, specifying just the major and minor version will get you the latest preinstalled patch version. In the previous example, the version spec `3.8` will use the `3.8.2` Python version found in the cache.
- Use `-dev` instead of a patch number (e.g., `3.11-dev`) to install the latest patch version release for a given minor version, *alpha and beta releases included*.
- Downloadable Python versions from GitHub Releases ([actions/python-versions](https://github.com/actions/python-versions/releases)).
- All available versions are listed in the [version-manifest.json](https://github.com/actions/python-versions/blob/main/versions-manifest.json) file.
- If there is a specific version of Python that is not available, you can open an issue here
**Note:** Python versions used in this action are generated in the [python-versions](https://github.com/actions/python-versions) repository. For macOS and Ubuntu images python versions are built from the source code. For Windows the python-versions repository uses installation executable. For more information please refer to the [python-versions](https://github.com/actions/python-versions) repository.
# Available versions of PyPy
`setup-python` is able to configure PyPy from two sources:
- Preinstalled versions of PyPy in the tools cache on GitHub-hosted runners
- For detailed information regarding the available versions of PyPy that are installed, see [Supported software](https://docs.github.com/en/actions/reference/specifications-for-github-hosted-runners#supported-software).
- For the latest PyPy release, all versions of Python are cached.
- Cache is updated with a 1-2 week delay. If you specify the PyPy version as `pypy3.7` or `pypy-3.7`, the cached version will be used although a newer version is available. If you need to start using the recently released version right after release, you should specify the exact PyPy version using `pypy3.7-v7.3.3` or `pypy-3.7-v7.3.3`.
- Downloadable PyPy versions from the [official PyPy site](https://downloads.python.org/pypy/).
- All available versions that we can download are listed in [versions.json](https://downloads.python.org/pypy/versions.json) file.
- PyPy < 7.3.3 are not available to install on-flight.
- If some versions are not available, you can open an issue in https://foss.heptapod.net/pypy/pypy/
# Hosted Tool Cache
GitHub hosted runners have a tools cache that comes with a few versions of 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: [Install-Toolset.ps1](https://github.com/actions/virtual-environments/blob/main/images/linux/scripts/installers/Install-Toolset.ps1) [Configure-Toolset.ps1](https://github.com/actions/virtual-environments/blob/main/images/linux/scripts/installers/Configure-Toolset.ps1)
- Tools cache setup for Windows: [Install-Toolset.ps1](https://github.com/actions/virtual-environments/blob/main/images/win/scripts/Installers/Install-Toolset.ps1) [Configure-Toolset.ps1](https://github.com/actions/virtual-environments/blob/main/images/win/scripts/Installers/Configure-Toolset.ps1)
# Specifying a Python version
If there is a specific version of Python that you need and you don't want to worry about any potential breaking changes due to patch updates (going from `3.7.5` to `3.7.6` for example), you should specify the exact major, minor, and patch version (such as `3.7.5`)
- The only downside to this is that set up will take a little longer since the exact version will have to be downloaded if the exact version is not already installed on the runner due to more recent versions.
- MSI installers are used on Windows for this, so runs will take a little longer to set up vs Mac and Linux.
You should specify only a major and minor version if you are okay with the most recent patch version being used.
- There will be a single patch version already installed on each runner for every minor version of Python that is supported.
- The patch version that will be preinstalled, will generally be the latest and every time there is a new patch released, the older version that is preinstalled will be replaced.
- Using the most recent patch version will result in a very quick setup since no downloads will be required since a locally installed version Python on the runner will be used.
# Specifying a PyPy version
The version of PyPy should be specified in the format `pypy<python_version>[-v<pypy_version>]` or `pypy-<python_version>[-v<pypy_version>]`.
The `<pypy_version>` parameter is optional and can be skipped. The latest version will be used in this case.
```
pypy3.7 or pypy-3.7 # the latest available version of PyPy that supports Python 3.7
pypy3.8 or pypy-3.8 # the latest available version of PyPy that supports Python 3.8
pypy2.7 or pypy-2.7 # the latest available version of PyPy that supports Python 2.7
pypy3.7-v7.3.3 or pypy-3.7-v7.3.3 # Python 3.7 and PyPy 7.3.3
pypy3.7-v7.x or pypy-3.7-v7.x # Python 3.7 and the latest available PyPy 7.x
pypy3.7-v7.3.3rc1 or pypy-3.7-v7.3.3rc1 # Python 3.7 and preview version of PyPy
pypy3.7-nightly or pypy-3.7-nightly # Python 3.7 and nightly PyPy
```
Note: `pypy2` and `pypy3` have been removed in v3. Use the format above instead.
# Check latest version
The `check-latest` flag defaults to `false`. Use the default or set `check-latest` to `false` if you prefer stability and if you want to ensure a specific `Python/PyPy` version is always used.
If `check-latest` is set to `true`, the action first checks if the cached version is the latest one. If the locally cached version is not the most up-to-date, a `Python/PyPy` version will then be downloaded. Set `check-latest` to `true` if you want the most up-to-date `Python/PyPy` version to always be used.
> Setting `check-latest` to `true` has performance implications as downloading `Python/PyPy` versions is slower than using cached versions.
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v3
with:
python-version: '3.7'
check-latest: true
- run: python my_script.py
```
# Caching packages dependencies
The action has built-in functionality for caching and restoring dependencies. It uses [actions/cache](https://github.com/actions/toolkit/tree/main/packages/cache) under the hood for caching dependencies but requires less configuration settings. Supported package managers are `pip`, `pipenv` and `poetry`. The `cache` input is optional, and caching is turned off by default.
The action defaults to searching for a dependency file (`requirements.txt` for pip, `Pipfile.lock` for pipenv or `poetry.lock` for poetry) in the repository, and uses its hash as a part of the cache key. Use `cache-dependency-path` for cases where multiple dependency files are used, they are located in different subdirectories or different files for the hash want to be used.
- For pip, the action will cache global cache directory
- For pipenv, the action will cache virtualenv directory
- For poetry, the action will cache virtualenv directory
**Please Note:** Restored cache will not be used if the requirements.txt file is not updated for a long time and a newer version of the dependency is available that can lead to an increase in total build time.
The requirements file format allows to specify dependency versions using logical operators (for example chardet>=3.0.4) or specify dependencies without any versions. In this case the pip install -r requirements.txt command will always try to install the latest available package version. To be sure that the cache will be used, please stick to a specific dependency version and update it manually if necessary.
- For `pip`, the action will cache the global cache directory
- For `pipenv`, the action will cache virtualenv directory
- For `poetry`, the action will cache virtualenv directory
**Caching pip dependencies:**
@ -299,151 +65,31 @@ steps:
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'pip'
cache: 'pip' # caching pip dependencies
- run: pip install -r requirements.txt
```
>**Note:** Restored cache will not be used if the requirements.txt file is not updated for a long time and a newer version of the dependency is available which can lead to an increase in total build time.
**Caching pipenv dependencies:**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'pipenv'
- name: Install pipenv
run: curl https://raw.githubusercontent.com/pypa/pipenv/master/get-pipenv.py | python
- run: pipenv install
```
>The requirements file format allows for specifying dependency versions using logical operators (for example chardet>=3.0.4) or specifying dependencies without any versions. In this case the pip install -r requirements.txt command will always try to install the latest available package version. To be sure that the cache will be used, please stick to a specific dependency version and update it manually if necessary.
**Caching poetry dependencies:**
```yaml
steps:
- uses: actions/checkout@v3
- name: Install poetry
run: pipx install poetry
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'poetry'
- run: poetry install
- run: poetry run pytest
```
See examples of using `cache` and `cache-dependency-path` for `pipenv` and `poetry` in the section: [Caching packages](docs/advanced-usage.md#caching-packages) of the [Advanced usage](docs/advanced-usage.md) guide.
**If you only need poetry install, consider using pip:**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'pip'
cache-dependency-path: 'poetry.lock'
- run: pip install .
- run: pytest
```
## Advanced usage
**Using wildcard patterns to cache dependencies**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'pip'
cache-dependency-path: '**/requirements-dev.txt'
- run: pip install -r subdirectory/requirements-dev.txt
```
- [Using the python-version input](docs/advanced-usage.md#using-the-python-version-input)
- [Using the python-version-file input](docs/advanced-usage.md#using-the-python-version-file-input)
- [Check latest version](docs/advanced-usage.md#check-latest-version)
- [Caching packages](docs/advanced-usage.md#caching-packages)
- [Outputs and environment variables](docs/advanced-usage.md#outputs-and-environment-variables)
- [Available versions of Python and PyPy](docs/advanced-usage.md#available-versions-of-python-and-pypy)
- [Hosted tool cache](docs/advanced-usage.md#hosted-tool-cache)
- [Using `setup-python` with a self-hosted runner](docs/advanced-usage.md#using-setup-python-with-a-self-hosted-runner)
- [Using `setup-python` on GHES](docs/advanced-usage.md#using-setup-python-on-ghes)
**Using a list of file paths to cache dependencies**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'pipenv'
cache-dependency-path: |
server/app/Pipfile.lock
__test__/app/Pipfile.lock
- name: Install pipenv
run: curl https://raw.githubusercontent.com/pypa/pipenv/master/get-pipenv.py | python
- run: pipenv install
```
**Using a list of wildcard patterns to cache dependencies**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.10'
cache: 'pip'
cache-dependency-path: |
**/setup.cfg
**/requirements*.txt
- run: pip install -e . -r subdirectory/requirements-dev.txt
```
# Environment variables
The `update-environment` flag defaults to `true`.
With this setting, the action will add/update environment variables (e.g. `PATH`, `PKG_CONFIG_PATH`, `pythonLocation`) for `python` to just work out of the box.
If `update-environment` is set to `false`, the action will not add/update environment variables.
This can prove useful if you want the only side-effect to be to ensure python is installed and rely on the `python-path` output to run python.
Such a requirement on side-effect could be because you don't want your composite action messing with your user's workflows.
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
id: cp310
with:
python-version: '3.10'
update-environment: false
- run: ${{ steps.cp310.outputs.python-path }} my_script.py
```
# Using `setup-python` with a self hosted runner
Python distributions are only available for the same [environments](https://github.com/actions/virtual-environments#available-environments) that GitHub Actions hosted environments are available for. If you are using an unsupported version of Ubuntu such as `19.04` or another Linux distribution such as Fedora, `setup-python` will not work. If you have a supported self-hosted runner and you would like to use `setup-python`, there are a few extra things you need to make sure are set up so that new versions of Python can be downloaded and configured on your runner.
If you are experiencing problems while configuring Python on your self-hosted runner, turn on [step debugging](https://github.com/actions/toolkit/blob/main/docs/action-debugging.md#step-debug-logs) to see addition logs.
### Windows
- 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.
- If your runner is configured as a service, make sure the account that is running the service has the appropriate write permissions so that Python can get installed. The default `NT AUTHORITY\NETWORK SERVICE` should be sufficient.
- 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.
### Linux
- The Python packages that are downloaded from `actions/python-versions` are originally compiled from source with the [--enable-shared](https://github.com/actions/python-versions/blob/main/builders/ubuntu-python-builder.psm1#L37) flag.
- By default runner downloads and install the tools to the `RUNNER_TOOL_CACHE` directory, however `AGENT_TOOLSDIRECTORY` can be set to override this location.
### Mac
- The Python packages that are downloaded from `actions/python-versions` are originally compiled from source with the [--enable-shared](https://github.com/actions/python-versions/blob/main/builders/macos-python-builder.psm1#L44) flag, however lack the relocatable flag.
- Due to the fixed shared library path, only the hosted tool cache of `/Users/runner/hostedtoolcache` is supported, and the path must be writeable by the runner user.
# 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`.
# Using `setup-python` on GHES
`setup-python` comes pre-installed on the appliance with GHES if Actions is enabled. When dynamically downloading Python distributions, `setup-python` downloads distributions from [`actions/python-versions`](https://github.com/actions/python-versions) on github.com (outside of the appliance). These calls to `actions/python-versions` are made via unauthenticated requests, which are limited to [60 requests per hour per IP](https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting). If more requests are made within the time frame, then you will start to see rate-limit errors during download that read `##[error]API rate limit exceeded for...`.
To avoid hitting rate-limit problems, we recommend [setting up your own runner tool cache](https://docs.github.com/en/enterprise-server@2.22/admin/github-actions/managing-access-to-actions-from-githubcom/setting-up-the-tool-cache-on-self-hosted-runners-without-internet-access#about-the-included-setup-actions-and-the-runner-tool-cache).
# License
## License
The scripts and documentation in this project are released under the [MIT License](LICENSE).
# Contributions
## Contributions
Contributions are welcome! See our [Contributor's Guide](docs/contributors.md).
Contributions are welcome! See our [Contributor's Guide](docs/contributors.md).

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@ -1,35 +1,35 @@
---
name: 'Setup Python'
description: 'Set up a specific version of Python and add the command-line tools to the PATH.'
author: 'GitHub'
name: "Setup Python"
description: "Set up a specific version of Python and add the command-line tools to the PATH."
author: "GitHub"
inputs:
python-version:
description: "Version range or exact version of Python to use, using SemVer's version range syntax. Reads from .python-version if unset."
description: "Version range or exact version of Python or PyPy to use, using SemVer's version range syntax. Reads from .python-version if unset."
python-version-file:
description: "File containing the Python version to use. Example: .python-version"
cache:
description: 'Used to specify a package manager for caching in the default directory. Supported values: pip, pipenv, poetry.'
description: "Used to specify a package manager for caching in the default directory. Supported values: pip, pipenv, poetry."
required: false
architecture:
description: 'The target architecture (x86, x64) of the Python interpreter.'
description: "The target architecture (x86, x64) of the Python or PyPy interpreter."
check-latest:
description: 'Set this option if you want the action to check for the latest available version that satisfies the version spec.'
description: "Set this option if you want the action to check for the latest available version that satisfies the version spec."
default: false
token:
description: Used to pull python distributions from actions/python-versions. Since there's a default, this is typically not supplied by the user.
description: "Used to pull python distributions from actions/python-versions. Since there's a default, this is typically not supplied by the user."
default: ${{ github.token }}
cache-dependency-path:
description: 'Used to specify the path to dependency files. Supports wildcards or a list of file names for caching multiple dependencies.'
description: "Used to specify the path to dependency files. Supports wildcards or a list of file names for caching multiple dependencies."
update-environment:
description: 'Set this option if you want the action to update environment variables.'
description: "Set this option if you want the action to update environment variables."
default: true
outputs:
python-version:
description: "The installed python version. Useful when given a version range as input."
description: "The installed Python or PyPy version. Useful when given a version range as input."
cache-hit:
description: 'A boolean value to indicate a cache entry was found'
description: "A boolean value to indicate a cache entry was found"
python-path:
description: "The absolute path to the Python executable."
description: "The absolute path to the Python or PyPy executable."
runs:
using: 'node16'
main: 'dist/setup/index.js'

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# Advanced Usage
- [Using the python-version input](advanced-usage.md#using-the-python-version-input)
- [Specifying a Python version](advanced-usage.md#specifying-a-python-version)
- [Specifying a PyPy version](advanced-usage.md#specifying-a-pypy-version)
- [Matrix Testing](advanced-usage.md#matrix-testing)
- [Using the python-version-file input](advanced-usage.md#using-the-python-version-file-input)
- [Check latest version](advanced-usage.md#check-latest-version)
- [Caching packages](advanced-usage.md#caching-packages)
- [Outputs and environment variables](advanced-usage.md#outputs-and-environment-variables)
- [Outputs](advanced-usage.md#outputs)
- [Environment variables](advanced-usage.md#environment-variables)
- [Using update-environment flag](advanced-usage.md#using-update-environment-flag)
- [Available versions of Python and PyPy](advanced-usage.md#available-versions-of-python-and-pypy)
- [Python](advanced-usage.md#python)
- [PyPy](advanced-usage.md#pypy)
- [Hosted tool cache](advanced-usage.md#hosted-tool-cache)
- [Using `setup-python` with a self-hosted runner](advanced-usage.md#using-setup-python-with-a-self-hosted-runner)
- [Windows](advanced-usage.md#windows)
- [Linux](advanced-usage.md#linux)
- [macOS](advanced-usage.md#macos)
- [Using `setup-python` on GHES](advanced-usage.md#using-setup-python-on-ghes)
## Using the `python-version` input
### Specifying a Python version
If there is a specific version of Python that you need and you don't want to worry about any potential breaking changes due to patch updates (going from `3.7.5` to `3.7.6` for example), you should specify the **exact major, minor, and patch version** (such as `3.7.5`):
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.7.5'
- run: python my_script.py
```
- The only downside to this is that setup may take a little longer. If the exact version is not already installed on the runner due to more recent versions, the exact version will have to be downloaded.
- MSI installers are used on Windows for this, so runs will take a little longer to set up vs macOS and Linux.
You can specify **only a major and minor version** if you are okay with the most recent patch version being used:
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.7'
- run: python my_script.py
```
- There will be a single patch version already installed on each runner for every minor version of Python that is supported.
- The patch version that will be preinstalled, will generally be the latest and every time there is a new patch released, the older version that is preinstalled will be replaced.
- Using the most recent patch version will result in a very quick setup since no downloads will be required since a locally installed version of Python on the runner will be used.
You can specify the version with **prerelease tag** to download and set up an accurate pre-release version of Python:
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.11.0-alpha.1'
- run: python my_script.py
```
It's also possible to use **x.y-dev syntax** to download and set up the latest patch version of Python, alpha and beta releases included. (for specified major & minor versions):
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.11-dev'
- run: python my_script.py
```
You can also use several types of ranges that are specified in [semver](https://github.com/npm/node-semver#ranges), for instance:
- **[hyphen ranges](https://github.com/npm/node-semver#hyphen-ranges-xyz---abc)** to download and set up the latest available version of Python (includes both pre-release and stable versions):
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.11.0-alpha - 3.11.0'
- run: python my_script.py
```
- **[x-ranges](https://github.com/npm/node-semver#x-ranges-12x-1x-12-)** to specify the latest stable version of Python (for specified major version):
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.x'
- run: python my_script.py
```
Please refer to the [Advanced range syntax section](https://github.com/npm/node-semver#advanced-range-syntax) of the [semver](https://github.com/npm/node-semver) to check other available range syntaxes.
### Specifying a PyPy version
The version of PyPy should be specified in the format `pypy<python_version>[-v<pypy_version>]` or `pypy-<python_version>[-v<pypy_version>]`.
The `-v<pypy_version>` parameter is optional and can be skipped. The latest PyPy version will be used in this case.
```
pypy3.8 or pypy-3.8 # the latest available version of PyPy that supports Python 3.8
pypy2.7 or pypy-2.7 # the latest available version of PyPy that supports Python 2.7
pypy3.7-v7.3.3 or pypy-3.7-v7.3.3 # Python 3.7 and PyPy 7.3.3
pypy3.7-v7.x or pypy-3.7-v7.x # Python 3.7 and the latest available PyPy 7.x
pypy3.7-v7.3.3rc1 or pypy-3.7-v7.3.3rc1 # Python 3.7 and preview version of PyPy
pypy3.7-nightly or pypy-3.7-nightly # Python 3.7 and nightly PyPy
```
Download and set up PyPy:
```yaml
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
python-version:
- 'pypy3.7' # the latest available version of PyPy that supports Python 3.7
- 'pypy3.7-v7.3.3' # Python 3.7 and PyPy 7.3.3
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: ${{ matrix.python-version }}
- run: python my_script.py
```
More details on PyPy syntax can be found in the [Available versions of PyPy](#pypy) section.
### Matrix Testing
Using `setup-python` it's possible to use [matrix syntax](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategymatrix) to install several versions of Python or PyPy:
```yaml
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
python-version: [ '2.x', '3.x', 'pypy2.7', 'pypy3.7', 'pypy3.8' ]
name: Python ${{ matrix.python-version }} sample
steps:
- uses: actions/checkout@v3
- name: Set up Python
uses: actions/setup-python@v4
with:
python-version: ${{ matrix.python-version }}
architecture: x64
- run: python my_script.py
```
Exclude a specific Python version:
```yaml
jobs:
build:
runs-on: ${{ matrix.os }}
strategy:
matrix:
os: [ubuntu-latest, macos-latest, windows-latest]
python-version: ['2.7', '3.7', '3.8', '3.9', '3.10', 'pypy2.7', 'pypy3.8']
exclude:
- os: macos-latest
python-version: '3.8'
- os: windows-latest
python-version: '3.6'
steps:
- uses: actions/checkout@v3
- name: Set up Python
uses: actions/setup-python@v4
with:
python-version: ${{ matrix.python-version }}
- name: Display Python version
run: python --version
```
## Using the `python-version-file` input
`setup-python` action can read Python or PyPy version from a version file. `python-version-file` input is used for specifying the path to the version file. If the file that was supplied to `python-version-file` input doesn't exist, the action will fail with error.
>In case both `python-version` and `python-version-file` inputs are supplied, the `python-version-file` input will be ignored due to its lower priority.
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version-file: '.python-version' # Read python version from a file .python-version
- run: python my_script.py
```
## Check latest version
The `check-latest` flag defaults to `false`. Use the default or set `check-latest` to `false` if you prefer stability and if you want to ensure a specific `Python or PyPy` version is always used.
If `check-latest` is set to `true`, the action first checks if the cached version is the latest one. If the locally cached version is not the most up-to-date, a `Python or PyPy` version will then be downloaded. Set `check-latest` to `true` if you want the most up-to-date `Python or PyPy` version to always be used.
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v3
with:
python-version: '3.7'
check-latest: true
- run: python my_script.py
```
> Setting `check-latest` to `true` has performance implications as downloading `Python or PyPy` versions is slower than using cached versions.
## Caching packages
**Caching pipenv dependencies:**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'pipenv'
- name: Install pipenv
run: curl https://raw.githubusercontent.com/pypa/pipenv/master/get-pipenv.py | python
- run: pipenv install
```
**Caching poetry dependencies:**
```yaml
steps:
- uses: actions/checkout@v3
- name: Install poetry
run: pipx install poetry
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'poetry'
- run: poetry install
- run: poetry run pytest
```
**Using a list of file paths to cache dependencies**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'pipenv'
cache-dependency-path: |
server/app/Pipfile.lock
__test__/app/Pipfile.lock
- name: Install pipenv
run: curl https://raw.githubusercontent.com/pypa/pipenv/master/get-pipenv.py | python
- run: pipenv install
```
**Using wildcard patterns to cache dependencies**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.9'
cache: 'pip'
cache-dependency-path: '**/requirements-dev.txt'
- run: pip install -r subdirectory/requirements-dev.txt
```
**Using a list of wildcard patterns to cache dependencies**
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.10'
cache: 'pip'
cache-dependency-path: |
**/setup.cfg
**/requirements*.txt
- run: pip install -e . -r subdirectory/requirements-dev.txt
```
# Outputs and environment variables
## Outputs
### `python-version`
Using **python-version** output it's possible to get the installed by action Python or PyPy version. This output is useful when the input `python-version` is given as a range (e.g. 3.8.0 - 3.10.0 ), but down in a workflow you need to operate with the exact installed version (e.g. 3.10.1).
```yaml
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
id: cp310
with:
python-version: "3.8.0 - 3.10.0"
- run: echo '${{ steps.cp310.outputs.python-version }}'
```
### `python-path`
**python-path** output is available with the absolute path of the Python or PyPy interpreter executable if you need it:
```yaml
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
id: cp310
with:
python-version: "3.10"
- run: pipx run --python '${{ steps.cp310.outputs.python-path }}' nox --version
```
### `cache-hit`
**cache-hit** output is available with a boolean value that indicates whether a cache hit occurred on the primary key:
```
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
id: cp310
with:
python-version: "3.8.0"
cache: "poetry"
- run: echo '${{ steps.cp310.outputs.cache-hit }}' # true if cache-hit occured on the primary key
```
## Environment variables
These environment variables become available after setup-python action execution:
| **Env.variable** | **Description** |
| ----------- | ----------- |
| pythonLocation |Contains the absolute path to the folder where the requested version of Python or PyPy is installed|
| Python_ROOT_DIR | https://cmake.org/cmake/help/latest/module/FindPython.html#module:FindPython |
| Python2_ROOT_DIR |https://cmake.org/cmake/help/latest/module/FindPython2.html#module:FindPython2|
| Python3_ROOT_DIR |https://cmake.org/cmake/help/latest/module/FindPython2.html#module:FindPython3|
## Using `update-environment` flag
The `update-environment` flag defaults to `true`.
With this setting, the action will add/update environment variables (e.g. `PATH`, `PKG_CONFIG_PATH`, `pythonLocation`) for Python or PyPy to just work out of the box.
If `update-environment` is set to `false`, the action will not add/update environment variables.
This can prove useful if you want the only side-effect to be to ensure Python or PyPy is installed and rely on the `python-path` output to run executable.
Such a requirement on side-effect could be because you don't want your composite action messing with your user's workflows.
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
id: cp310
with:
python-version: '3.10'
update-environment: false
- run: ${{ steps.cp310.outputs.python-path }} my_script.py
```
## Available versions of Python and PyPy
### Python
`setup-python` is able to configure **Python** from two sources:
- Preinstalled versions of Python in the tool cache on GitHub-hosted runners.
- For detailed information regarding the available versions of Python that are installed, see [Supported software](https://docs.github.com/en/actions/reference/specifications-for-github-hosted-runners#supported-software).
- For every minor version of Python, expect only the latest patch to be preinstalled.
- If `3.8.1` is installed for example, and `3.8.2` is released, expect `3.8.1` to be removed and replaced by `3.8.2` in the tool cache.
- If the exact patch version doesn't matter to you, specifying just the major and minor versions will get you the latest preinstalled patch version. In the previous example, the version spec `3.8` will use the `3.8.2` Python version found in the cache.
- Use `-dev` instead of a patch number (e.g., `3.11-dev`) to install the latest patch version release for a given minor version, *alpha and beta releases included*.
- Downloadable Python versions from GitHub Releases ([actions/python-versions](https://github.com/actions/python-versions/releases)).
- All available versions are listed in the [version-manifest.json](https://github.com/actions/python-versions/blob/main/versions-manifest.json) file.
- If there is a specific version of Python that is not available, you can open an issue here
>**Note:** Python versions used in this action are generated in the [python-versions](https://github.com/actions/python-versions) repository. For macOS and Ubuntu images, python versions are built from the source code. For Windows, the python-versions repository uses installation executable. For more information please refer to the [python-versions](https://github.com/actions/python-versions) repository.
### PyPy
`setup-python` is able to configure **PyPy** from two sources:
- Preinstalled versions of PyPy in the tool cache on GitHub-hosted runners
- For detailed information regarding the available versions of PyPy that are installed, see [Supported software](https://docs.github.com/en/actions/reference/specifications-for-github-hosted-runners#supported-software).
- For the latest PyPy release, all versions of Python are cached.
- Cache is updated with a 1-2 week delay. If you specify the PyPy version as `pypy3.7` or `pypy-3.7`, the cached version will be used although a newer version is available. If you need to start using the recently released version right after release, you should specify the exact PyPy version using `pypy3.7-v7.3.3` or `pypy-3.7-v7.3.3`.
- Downloadable PyPy versions from the [official PyPy site](https://downloads.python.org/pypy/).
- All available versions that we can download are listed in [versions.json](https://downloads.python.org/pypy/versions.json) file.
- PyPy < 7.3.3 are not available to install on-flight.
- If some versions are not available, you can open an issue in https://foss.heptapod.net/pypy/pypy/
## Hosted tool cache
GitHub hosted runners have a tool cache that comes with a few versions of Python + PyPy already installed. This tool 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 the tool cache with Python and PyPy installed. `setup-python` works by taking a specific version of Python or PyPy from this tool 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 set up in [actions/virtual-environments](https://github.com/actions/virtual-environments). During the setup, the available versions of Python and PyPy are automatically downloaded, set up and documented.
- Tool cache setup for Ubuntu: [Install-Toolset.ps1](https://github.com/actions/virtual-environments/blob/main/images/linux/scripts/installers/Install-Toolset.ps1) [Configure-Toolset.ps1](https://github.com/actions/virtual-environments/blob/main/images/linux/scripts/installers/Configure-Toolset.ps1)
- Tool cache setup for Windows: [Install-Toolset.ps1](https://github.com/actions/virtual-environments/blob/main/images/win/scripts/Installers/Install-Toolset.ps1) [Configure-Toolset.ps1](https://github.com/actions/virtual-environments/blob/main/images/win/scripts/Installers/Configure-Toolset.ps1)
## Using `setup-python` with a self-hosted runner
Python distributions are only available for the same [environments](https://github.com/actions/virtual-environments#available-environments) that GitHub Actions hosted environments are available for. If you are using an unsupported version of Ubuntu such as `19.04` or another Linux distribution such as Fedora, `setup-python` may not work.
If you have a supported self-hosted runner and you would like to use `setup-python`, there are a few extra things you need to make sure are set up so that new versions of Python can be downloaded and configured on your runner.
### Windows
- 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.
- If your runner is configured as a service, make sure the account that is running the service has the appropriate write permissions so that Python can get installed. The default `NT AUTHORITY\NETWORK SERVICE` should be sufficient.
- You need `7zip` installed and added to your `PATH` so that the downloaded versions of Python files can be extracted properly during the 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.
> By default runner downloads and installs tools into the folder set up by `RUNNER_TOOL_CACHE` environment variable. The environment variable called `AGENT_TOOLSDIRECTORY` can be set to change this location for Windows self-hosted runners.
>If you are experiencing problems while configuring Python on your self-hosted runner, turn on [step debugging](https://github.com/actions/toolkit/blob/main/docs/action-debugging.md#step-debug-logs) to see additional logs.
### Linux
By default runner downloads and installs tools into the folder set up by `RUNNER_TOOL_CACHE` environment variable. The environment variable called `AGENT_TOOLSDIRECTORY` can be set to change this location for Linux self-hosted runners:
- In the same shell that your runner is using, type `export AGENT_TOOLSDIRECTORY=/path/to/folder`.
- More permanent way of setting the environment variable is to create an `.env` file in the same directory as your runner and to add `AGENT_TOOLSDIRECTORY=/path/to/folder`. This ensures the variable is always set if your runner is configured as a service.
If you're using a non-default tool cache directory be sure that the user starting the runner has write permission to the new tool cache directory. To check the current user and group that the runner belongs type `ls -l` inside the runner's root directory.
The runner can be granted write access to any 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.
- All users have write permission.
One quick way to grant access is to change the user and group of the non-default tool cache folder to be the same as the runners using `chown`:
`sudo chown runner-user:runner-group /path/to/folder`.
> 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://docs.github.com/en/actions/hosting-your-own-runners/configuring-the-self-hosted-runner-application-as-a-service#checking-the-status-of-the-service).
### macOS
The Python packages for macOS that are downloaded from `actions/python-versions` are originally compiled from the source in `/Users/runner/hostedtoolcache`. Due to the fixed shared library path, these Python packages are non-relocatable and require to be installed only in `/Users/runner/hostedtoolcache`. Before the use of `setup-python` on the macOS self-hosted runner:
- Create a directory called `/Users/runner/hostedtoolcache`
- Change the permissions of `/Users/runner/hostedtoolcache` so that the runner has write access
You can check the current user and group that the runner belongs to by typing `ls -l` inside the runner's root directory.
The runner can be granted write access to the `/Users/runner/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
- All users have write permission.
One quick way to grant access is to change the user and group of `/Users/runner/hostedtoolcache` to be the same as the runners using `chown`:
`sudo chown runner-user:runner-group /Users/runner/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://docs.github.com/en/actions/hosting-your-own-runners/configuring-the-self-hosted-runner-application-as-a-service#checking-the-status-of-the-service).
## Using `setup-python` on GHES
`setup-python` comes pre-installed on the appliance with GHES if Actions is enabled. When dynamically downloading Python distributions, `setup-python` downloads distributions from [`actions/python-versions`](https://github.com/actions/python-versions) on github.com (outside of the appliance). These calls to `actions/python-versions` are made via unauthenticated requests, which are limited to [60 requests per hour per IP](https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting). If more requests are made within the time frame, then you will start to see rate-limit errors during downloading that looks like: `##[error]API rate limit exceeded for...`.
To avoid hitting rate-limit problems, we recommend [setting up your own runner tool cache](https://docs.github.com/en/enterprise-server@2.22/admin/github-actions/managing-access-to-actions-from-githubcom/setting-up-the-tool-cache-on-self-hosted-runners-without-internet-access#about-the-included-setup-actions-and-the-runner-tool-cache).