Support for python 3.13.0?

[blockjon-dd]

Should this work with python 3.13.0?

When I try to use the new rules_python 0.37.1 and to use Python version 3.13.0, rules_pycross fails with this message:

$ bazel run //services/demohelloworldpython:main
INFO: Invocation ID: 98cd8f79-6766-42d9-b389-a2c703ee34da
ERROR: /home/dev/.cache/bazel/_bazel_dev/155bb1574771dc607335fbe8110386b4/external/rules_python~/python/config_settings/BUILD.bazel: no such target '@@rules_python~//python/config_settings:is_python_3.10.11': target 'is_python_3.10.11' not declared in package 'python/config_settings' defined by /home/dev/.cache/bazel/_bazel_dev/155bb1574771dc607335fbe8110386b4/external/rules_python~/python/config_settings/BUILD.bazel (did you mean is_python_3.11.10, _is_python_3.11.10, is_python_3.10, is_python_3.11, is_python_3.12.7, is_python_3.13.0, is_python_3.8.12, _is_python_3.12.7, _is_python_3.13.0, or is_python_3.12?)
ERROR: /home/dev/.cache/bazel/_bazel_dev/155bb1574771dc607335fbe8110386b4/external/rules_pycross~~toolchains~pycross_toolchains/BUILD.bazel:6:33: errors encountered resolving select() keys for @@rules_pycross~~toolchains~pycross_toolchains//:_interpreter_version
ERROR: /workspaces/myproject/services/demohelloworldpython/BUILD.bazel:3:10: Analysis failed
ERROR: Analysis of target '//services/demohelloworldpython:main' failed; build aborted
INFO: Elapsed time: 1.274s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
ERROR: Build did NOT complete successfully
ERROR: Build failed. Not running target

[betaboon]

heya. I just stumbled upon this (or something similar) yesterday.

someone on slack helped me debug, and we found a solution/workaround.

add in MODULE.bazel:

python.override(register_all_versions = True)

I haven't yet fully understood the cause tho.

these are my findings:

• bisecting revealed fix(bzlmod): set the default_version to the python_version flag bazelbuild/rules_python#2253 to introduce the issue
• that MR changes the toolchain-registration to use the newly introduced PYTHON_VERSIONSfrom @pythons_hub instead of the previous TOOL_VERSIONS
• pycross uses TOOL_VERSIONS from rules_python to construct select-options here

so it might be that pycross should use PYTHON_VERSIONS instead of TOOL_VERSIONS ?

[betaboon]

i just noticed something else.

i got the following in my MODULE.bazel:

python.toolchain(
    is_default = True,
    python_version = "3.12",
)

this normally would have caused the latest patch-level to be used (e.g. 3.12.7)
but i can observe that 3.12.0 is being used.

I don't know if that is due to the workaround or something else.

[betaboon]

@aignas just reported in slack that he found a bug on rules_python's end, which might be the root-cause for this.
bazelbuild/rules_python#2350

[blockjon-dd]

Thanks @betaboon ... looking forward for the next release of rules_python!