To update requirements and generate BUILD.bazel files run:

bazel run //:requirements.update
bazel run //:gazelle_python_manifest.update
bazel run //:gazelle

or: make generate_build_files

Then go forth and run your targets to your heart's content. E.g. bazel run //test_project:test_project_bin

PyO3

The PyO3 Support in this Repo is there, but it is pretty sketchy. The Crux of the matter: one needs to build one's own versions of pyo3 with specific compiler flags for one's python version. It is particularly important to compile pyo3-ffi and pyo3-macros as, without compiling them in bazel, I was not able to get the right proc macros I needed. Most notably #[pyfunction], #[pymodule] & #[pyfn].

Lastly, one needs to make sure that the crate_name of the rust_shared_library is the same as the name of the pymodule defined in the rust code. Else it does not import.

Time permitting I may convert this into a rules_pyo3 repo that can more easily be reused.