Remove support for runtime.txt
#352
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The Heroku-proprietary `runtime.txt` file was previously deprecated in both the classic buildpack and CNB, in favour of the more widely supported `.python-version` file: https://devcenter.heroku.com/changelog-items/3005 https://devcenter.heroku.com/changelog-items/3141 We will be keeping support for `runtime.txt` in the classic Python buildpack for a while longer. However, since the CNB is new (and not used by any/many Heroku apps yet since it only GAed this week), we're dropping support for `runtime.txt` here sooner, to encourage migration. (Particularly since uv support will require apps to be using `.python-version`) Closes #275. GUS-W-16878263.
colincasey
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## heroku/python ### Removed - Removed support for the deprecated `runtime.txt` file. Python versions must now be specified using a `.python-version` file instead. ([#352](#352)) - Removed support for Ubuntu 20.04 (and thus Heroku-20 / `heroku/builder:20`). ([#358](#358)) ### Changed - Improved the error messages shown when `.python-version` contains an invalid Python version or stray invisible characters (such as ASCII control codes). ([#353](#353) and [#354](#354)) - Improved the error messages shown if I/O errors occur. ([#355](#355) and [#356](#356))
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## heroku/python ### Removed - Removed support for the deprecated `runtime.txt` file. Python versions must now be specified using a `.python-version` file instead. ([#352](heroku/buildpacks-python#352)) - Removed support for Ubuntu 20.04 (and thus Heroku-20 / `heroku/builder:20`). ([#358](heroku/buildpacks-python#358)) ### Changed - Improved the error messages shown when `.python-version` contains an invalid Python version or stray invisible characters (such as ASCII control codes). ([#353](heroku/buildpacks-python#353) and [#354](heroku/buildpacks-python#354)) - Improved the error messages shown if I/O errors occur. ([#355](heroku/buildpacks-python#355) and [#356](heroku/buildpacks-python#356))
edmorley
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Backports the improvements made as part of: - heroku/buildpacks-python#352 - heroku/buildpacks-python#353 - heroku/buildpacks-python#354 - heroku/buildpacks-python#355 Plus: - applies similar changes to equivalent error messages that only exist in the classic buildpack (eg the Pipenv errors) - switches to use of contractions as per the CX team's style guidelines GUS-W-18225347. GUS-W-18421778.
edmorley
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May 2, 2025
Backports the error message/build output improvements made as part of: - heroku/buildpacks-python#352 - heroku/buildpacks-python#353 - heroku/buildpacks-python#354 - heroku/buildpacks-python#355 Plus: - applies similar changes to equivalent error messages that only exist in the classic buildpack (eg the Pipenv errors) - switches to use of contractions as per the CX team's style guidelines GUS-W-18225347. GUS-W-18421778.
edmorley
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May 2, 2025
Backports the error message/build output improvements made as part of: - heroku/buildpacks-python#352 - heroku/buildpacks-python#353 - heroku/buildpacks-python#354 - heroku/buildpacks-python#355 Plus: - applies similar changes to equivalent error messages that only exist in the classic buildpack (eg the Pipenv errors) - switches to use of contractions as per the CX team's style guidelines GUS-W-18225347. GUS-W-18421778.
edmorley
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May 2, 2025
Backports the error message/build output improvements made as part of: - heroku/buildpacks-python#352 - heroku/buildpacks-python#353 - heroku/buildpacks-python#354 - heroku/buildpacks-python#355 Plus: - applies similar changes to equivalent error messages that only exist in the classic buildpack (eg the Pipenv errors) - switches to use of contractions as per the CX team's style guidelines GUS-W-18225347. GUS-W-18421778.
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The Heroku-proprietary
runtime.txtfile was previously deprecated in both the classic buildpack and CNB, in favour of the more widely supported.python-versionfile:https://devcenter.heroku.com/changelog-items/3005
https://devcenter.heroku.com/changelog-items/3141
We will be keeping support for
runtime.txtin the classic Python buildpack for a while longer. However, since the CNB is new (and not used by any/many Heroku apps yet since it only GAed this week), we're dropping support forruntime.txthere sooner, to encourage migration to.python-versionwhen apps migrate from Cedar to Fir. (Particularly since uv support will require apps to be using.python-version)Closes #275.
GUS-W-16878263.