Support major Python version syntax in runtime.txt
#322
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Historically the `runtime.txt` file has only supported specifying an exact Python version, in the form `python-3.X.Y`. This adds support for the `python-3.X` form too, which means the app will automatically receive new Python patch updates during subsequent builds. This means the Python CNB's `runtime.txt` supported syntax now matches that supported by the classic Python buildpack (which gained support for the major version form as part of adding support for the `.python-version` file). The `runtime.txt` file remains deprecated (a deprecation warning will be added shortly), however, in the meantime this improves parity between the classic buildpack and CNB. GUS-W-17660224.
Malax
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Jan 23, 2025
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## heroku/python ### Added - Added `runtime.txt` support for the `python-3.X` major Python version form. ([#322](#322)) - Enabled `libcnb`'s `trace` feature. ([#320](#320)) ### Changed - The Python 3.13 version alias now resolves to Python 3.13.2. ([#326](#326)) - The Python 3.12 version alias now resolves to Python 3.12.9. ([#326](#326)) - Deprecated support for the `runtime.txt` file. ([#325](#325)) - Improved the error messages shown when the `.python-version` file contents aren't valid. ([#325](#325))
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## heroku/python ### Added - Added `runtime.txt` support for the `python-3.X` major Python version form. ([#322](heroku/buildpacks-python#322)) - Enabled `libcnb`'s `trace` feature. ([#320](heroku/buildpacks-python#320)) ### Changed - The Python 3.13 version alias now resolves to Python 3.13.2. ([#326](heroku/buildpacks-python#326)) - The Python 3.12 version alias now resolves to Python 3.12.9. ([#326](heroku/buildpacks-python#326)) - Deprecated support for the `runtime.txt` file. ([#325](heroku/buildpacks-python#325)) - Improved the error messages shown when the `.python-version` file contents aren't valid. ([#325](heroku/buildpacks-python#325))
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Historically the
runtime.txtfile has only supported specifying an exact Python version, in the formpython-3.X.Y.This adds support for the
python-3.Xform too, which means the app will automatically receive new Python patch updates during subsequent builds (similar to what's already supported for the.python-versionfile).This means the Python CNB's
runtime.txtsupported syntax now matches that supported by the classic Python buildpack (which gained support for the major version form as part of adding support for the.python-versionfile in heroku/heroku-buildpack-python#1664).The
runtime.txtfile remains deprecated (a deprecation warning will be added shortly: #275), however, in the meantime this improves parity between the classic buildpack and CNB.GUS-W-17660224.