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## Specifying a Python version ## 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`): 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 ```yaml
steps: steps:
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python-version: '3.7.5' python-version: '3.7.5'
- run: python my_script.py - run: python my_script.py
``` ```
- 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. - 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 MacOS and Linux. - 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: You can specify **only a major and minor version** if you are okay with the most recent patch version being used:
```yaml ```yaml
steps: steps:
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- 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. - 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. - 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: You can specify the version with **prerelease tag** to download and set up an accurate pre-release version of Python:
```yaml ```yaml
steps: steps:
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- run: python my_script.py - 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): 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 ```yaml
steps: steps:
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- run: python my_script.py - 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: 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): - **[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):
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- run: python my_script.py - 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): **[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 ```yaml
steps: steps: