Python 3.13.3 Nanobind circular import for C packages

[petrasvestartas]

Bug description:

Nanobind C python packages fails to build for python 3.13.3 due to circular import.
All other versions works, I have no way to solver this.

Source:
https://github.com/compas-dev/compas_shapeop/tree/main/src/compas_shapeop

======================================================================================================================================= ERRORS ========================================================================================================================================
____________________________________________________________________________________________________________________ ERROR collecting tests/test_dynamicsolver.py _____________________________________________________________________________________________________________________
ImportError while importing test module 'C:\brg\code\forks\compas_shapeop\tests\test_dynamicsolver.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
C:\brg\code\forks\compas_shapeop\tests\test_dynamicsolver.py:3: in <module>
    from compas_shapeop import Solver
..\venv-test\Lib\site-packages\compas_shapeop\__init__.py:8: in <module>
    from .shapeop import Solver
..\venv-test\Lib\site-packages\compas_shapeop\shapeop.py:9: in <module>
    from . import _shapeop
E   ImportError: cannot import name '_shapeop' from partially initialized module 'compas_shapeop' (most likely due to a circular import) (C:\Users\petrasv\AppData\Local\Temp\cibw-run-5_x5v_b7\cp313-win_amd64\venv-test\Lib\site-packages\compas_shapeop\__init__.py)
=============================================================================================================================== short test summary info ===============================================================================================================================
ERROR ..\..\..\..\..\..\..\..\brg\code\forks\compas_shapeop\tests\test_dynamicsolver.py
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
================================================================================================================================== 1 error in 2.72s ===================================================================================================================================

CPython versions tested on:

3.13

Operating systems tested on:

Windows

[picnixz]

• Have you tried resetting up the entire virtual environment?
• Does it work with Python 3.14? if not, it could be easier to debug, otherwise it may be tricky.
• I couldn't find _shapeop in your sources, so I guess it's a C module, but should it be imported from .? It may also be an issue with the path? Is the module available? namely what if you run an interpreter and just try import _shapeop? Maybe it's not installed at all (hence the error?)
• Could it be a nanobind issue? if so, it should be reported first to their repository I think.

[petrasvestartas]

It was a nanobind issue:
scikit-build/scikit-build-core#1077

[henryiii]

It was a user issue - you need to request the Stable ABI component to use the Stable ABI when you FindPython in CMake. But nanobind could possibly produced a nice error instead of just doing the wrong thing.