feat(toolchain): drop 3.8 and print info level messages about it (#3387)

Before this PR we had to have at least one 3.8 toolchain to not break
things.
With this we should be good to drop it.

Any python_version 3.8 registrations will be dropped if there are no
actual
URLs configured, which means that 3.8 will not be selected. The same
with
pip.parse, we will just ignore it and won't add it to the hub. 

In order to ensure that `is_python_3.x` flags continue working, we
just alias them to `@platforms//:incompatible`. No deprecation message
is
printed.

Work towards #2704 

Next step for anyone interested and who has more time than me these
days:
- [ ] Remove the 3.9 URLs and add them individually to our examples to
show
      that one can do that.
- [ ] Update the examples to no longer use 3.9, because it is a
maintenance burden.
6 files changed
tree: 4018ad7878d330a82fe71de411c7853a659727bb
  1. .bazelci/
  2. .bcr/
  3. .ci/
  4. .github/
  5. docs/
  6. examples/
  7. gazelle/
  8. private/
  9. python/
  10. sphinxdocs/
  11. tests/
  12. tools/
  13. .bazelignore
  14. .bazelrc
  15. .bazelversion
  16. .editorconfig
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .pre-commit-config.yaml
  21. .python-version
  22. .readthedocs.yml
  23. addlicense.sh
  24. AGENTS.md
  25. AUTHORS
  26. BUILD.bazel
  27. BZLMOD_SUPPORT.md
  28. CHANGELOG.md
  29. CONTRIBUTING.md
  30. CONTRIBUTORS
  31. GEMINI.md
  32. internal_dev_deps.bzl
  33. internal_dev_setup.bzl
  34. LICENSE
  35. MODULE.bazel
  36. README.md
  37. RELEASING.md
  38. version.bzl
  39. WORKSPACE
  40. WORKSPACE.bzlmod
README.md

Python Rules for Bazel

Build status

Overview

This repository is the home of the core Python rules -- py_library, py_binary, py_test, py_proto_library, and related symbols that provide the basis for Python support in Bazel. It also contains package installation rules for integrating with PyPI and other indices.

Documentation for rules_python is at https://rules-python.readthedocs.io and in the Bazel Build Encyclopedia.

Examples live in the examples directory.

The core rules are stable. Their implementation is subject to Bazel's backward compatibility policy. This repository aims to follow semantic versioning.

The Bazel community maintains this repository. Neither Google nor the Bazel team provides support for the code. However, this repository is part of the test suite used to vet new Bazel releases. See How to contribute page for information on our development workflow.

Documentation

For detailed documentation, see https://rules-python.readthedocs.io

Bzlmod support

See Bzlmod support for more details.