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add check-latest to the documentation

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Dmitry Shibanov 2022-05-09 10:32:31 +02:00
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@ -209,6 +209,24 @@ pypy-3.7-v7.3.3rc1 # Python 3.7 and preview version of PyPy
pypy-3.7-nightly # Python 3.7 and nightly PyPy
```
# 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.