Future improvements to our Python rules

[Lukács T. Berki]

Hello there,

Quick situation report: unfortunately, due to other prioritites, the Bazel team has not given much love to our Python rules recently. However, we know that they are important for you and for Bazel and it's going to get better soon: Jon Brandvein will be working on them from mid-August, starting with iterating on the design of these rules with this community.

Thanks for your continued collective patience and expect to see more activity in this space starting in August!

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Lukács T. Berki | Software Engineer | lbe...@google.com | 

Google Germany GmbH | Erika-Mann-Str. 33  | 80636 München | Germany | Geschäftsführer: Paul Manicle, Halimah DeLaine Prado | Registergericht und -nummer: Hamburg, HRB 86891

[Josh Burkart]

Thanks for the update! FYI I've been using the custom Bazel Python rules from this repo ("rules_pyz") with a lot of success. Might be a useful resource.

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Josh Burkart, PhD

Scientist/engineer

ClimaCell, Inc.

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[t...@spotify.com]

Thanks for the update indeed - that's fantastic to hear! We're currently looking into using Bazel for scientific Python projects at Spotify, so this is great news!

Best,

Thomas

[Alex Thompson]

Hi Lukács,

Any more updates on this front? Is design or development underway, and if so, how can we keep on eye on the progress?

Thanks!

Alex

[Jon Brandvein]

Hi Alex,

We've begun improving the core Python rules, mainly with regard to Py2 vs 3 issues, but the changes aren't committed yet due to a blocker that I expect to be resolved next week. As a prerequisite, we also open sourced some unit tests for the rules.

The fixes I expect soon are:

- building a Py3-only py_library at the top-level without having to specify --force_python (#1446)

- Py3 targets should run with the system "python3" command by default (#4815)

- clearer documentation for the various flags/attributes that control what python mode you're in

After that, we'll put out a design doc for a py_toolchain rule (perhaps just a refinement of the existing py_runtime) to allow per-target selection of the python interpreter -- basically a concretization of the py_toolchain proposed in the Purple Boa doc. Stay tuned.

Pip integration (rules_python) and building extensions are also big concerns but we do not yet have precise plans for those.

As for keeping up with the progress: I've been updating relevant github issue threads, and you can watch this mailing list for upcoming docs.

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[Alex Thompson]

Thanks so much for the update Jon. I'll keep an eye on the "rules > python" category on GitHub for progress. I appreciate the work you guys are doing!

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Alex