Add support for the .python-version file
#1664
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Oct 14, 2024
Following on from the recent Python version refactoring, this now adds support for configuring the app's Python version using a `.python-version` file. This file is used by several tools in the Python ecosystem (such as pyenv, `actions/setup-python`, uv), whereas the existing `runtime.txt` file is proprietary to Heroku. This change is the classic Python buildpack equivalent of the Python CNB change here: heroku/buildpacks-python#272 If both a `runtime.txt` file and a `.python-version` file are present, then the `runtime.txt` file will take precedence. However, use of the `.python-version` file is now recommended, since `runtime.txt` will be deprecated in the future. Both the `runtime.txt` file and `.python-version` file take precedence over any Python version specified in a `Pipfile.lock` for Pipenv users. We support the following `.python-version` syntax: - Major Python version (e.g. `3.13`, which will then be resolved to the latest Python 3.13). (This form is recommended, since it allows for Python security updates to be pulled in without having to manually bump the version.) - Exact Python version (e.g. `3.13.0`) - Comments (lines starting with `#`) - Blank lines We don't support the following `.python-version` features: - Specifying multiple Python versions - Prefixing versions with `python-` (since this form is undocumented and will likely be deprecated by pyenv in the future) In addition, the existing `runtime.txt` support has been updated to allow specifying just the major Python version, in order to increase feature parity between the files, and avoid confusion if users try to use the major version only syntax from `.python-version` in their `runtime.txt`. Refs #913. Refs #932. GUS-W-7671453. GUS-W-16821357.
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Updated docs: Posted changelog: Updated the Python getting started guide to use |
This was referenced Oct 14, 2024
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Created entry in the public roadmap: |
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Following on from the recent Python version refactoring in #1658, this now adds support for configuring the app's Python version using a
.python-versionfile. This file is used by several tools in the Python ecosystem (such as pyenv,actions/setup-python, uv), whereas the existingruntime.txtfile is proprietary to Heroku.This change is the classic Python buildpack equivalent of the Python CNB change here:
heroku/buildpacks-python#272
If both a
runtime.txtfile and a.python-versionfile are present, then theruntime.txtfile will take precedence. However, use of the.python-versionfile is now recommended, sinceruntime.txtwill be deprecated in the future. Both theruntime.txtfile and.python-versionfile take precedence over any Python version specified in aPipfile.lockfor Pipenv users.We support the following
.python-versionsyntax:3.13, which will then be resolved to the latest Python 3.13). (This form is recommended, since it allows for Python security updates to be pulled in without having to manually bump the version.)3.13.0)#)We don't support the following
.python-versionfeatures:python-(since this form is undocumented and will likely be deprecated by pyenv in the future)In addition, the existing
runtime.txtsupport has been updated to allow specifying just the major Python version, in order to increase feature parity between the files, and avoid confusion if users try to use the major version only syntax from.python-versionin theirruntime.txt.Closes #913.
Closes #932.
GUS-W-7671453.
GUS-W-16821357.