"ModuleNotFoundError: No module named 'numpy' " error when pip installing

[sschmidt23]

We have a recent issue that started occurring: we have a repo where somoclu is installed via pip in a nightly GitHub action. While previously installing just fine, in late October (October 25th to be exact) the action started failing with a "ModuleNotFoundError: No module named 'numpy' " error.

We're not sure if there was an update to setuptools, pypi build code, or something else, but we think it might be due to pypi's handling of build isolation and the lack of explicit build requirements in somoclu, i.e.: this post

(though I do note that this may not be the actual problem since I don't see an actual change from pypi or setuptools in October that would have suddenly triggered this. The errors coming explicitly from setuptools/build_meta does seem relevant in tracking this down).

Here is the full traceback of the error from our GitHub action:

Collecting somoclu (from pz-rail-som->pz-rail==0.1.dev1+ga251e75eb)
  Downloading somoclu-1.7.6.tar.gz (1.6 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.6/1.6 MB 54.5 MB/s  0:00:00
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'error'
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [17 lines of output]
      Traceback (most recent call last):
        File "/opt/hostedtoolcache/Python/3.10.18/x64/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 389, in <module>
          main()
        File "/opt/hostedtoolcache/Python/3.10.18/x64/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 373, in main
          json_out["return_val"] = hook(**hook_input["kwargs"])
        File "/opt/hostedtoolcache/Python/3.10.18/x64/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 143, in get_requires_for_build_wheel
          return hook(config_settings)
        File "/tmp/pip-build-env-a649r7b2/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 331, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=[])
        File "/tmp/pip-build-env-a649r7b2/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 301, in _get_build_requires
          self.run_setup()
        File "/tmp/pip-build-env-a649r7b2/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 512, in run_setup
          super().run_setup(setup_script=setup_script)
        File "/tmp/pip-build-env-a649r7b2/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 317, in run_setup
          exec(code, locals())
        File "<string>", line 4, in <module>
      ModuleNotFoundError: No module named 'numpy'
      [end of output] 

[Tortoise17]

@sschmidt23 Install numpy < 2 before pip install somoclu

[sschmidt23]

Are there any plans to update pypi installs to support numpy >= 2.0? conda installed versions of the code currently work just fine (at least for the SOM functionality that we employ) with numpy > 2.0. Also, while we do not have explicit numpy > 2.0 requirements in our code yet, packages are starting to drop numpy < 2.0 support, and this issue is bound to crop up again in the near future if the version is pinned as a temporary solution.

[xgdgsc]

I tried uv a bit but didn' t figure out how to do it properly. You can try 2b36228 to see if it works. If not working, PRs welcome.