I wanted to install the module PyStray for a project.

I used the generic command ->
pip install Pystruct

Here is the error :

Collecting Pystruct
  Using cached pystruct-0.3.2.tar.gz (5.6 MB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... 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 "C:UsersMeit SantAppDataLocalProgramsPythonPython310libsite-packagespip_vendorpyproject_hooks_in_process_in_process.py", line 353, in <module>
          main()
        File "C:UsersMeit SantAppDataLocalProgramsPythonPython310libsite-packagespip_vendorpyproject_hooks_in_process_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
        File "C:UsersMeit SantAppDataLocalProgramsPythonPython310libsite-packagespip_vendorpyproject_hooks_in_process_in_process.py", line 118, in get_requires_for_build_wheel
          return hook(config_settings)
        File "C:UsersMeit SantAppDataLocalTemppip-build-env-3y5ayshqoverlayLibsite-packagessetuptoolsbuild_meta.py", line 325, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=['wheel'])
        File "C:UsersMeit SantAppDataLocalTemppip-build-env-3y5ayshqoverlayLibsite-packagessetuptoolsbuild_meta.py", line 295, in _get_build_requires
          self.run_setup()
        File "C:UsersMeit SantAppDataLocalTemppip-build-env-3y5ayshqoverlayLibsite-packagessetuptoolsbuild_meta.py", line 487, in run_setup
          super().run_setup(setup_script=setup_script)
        File "C:UsersMeit SantAppDataLocalTemppip-build-env-3y5ayshqoverlayLibsite-packagessetuptoolsbuild_meta.py", line 311, in run_setup
          exec(code, locals())
        File "<string>", line 3, in <module>
      ModuleNotFoundError: No module named 'numpy'
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.

As it says ModuleNotFoundError: No module named 'numpy', I installed Numpy using pip install numpy, which completed successfully.

Collecting numpy
  Downloading numpy-1.26.4-cp310-cp310-win_amd64.whl.metadata (61 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 61.0/61.0 kB 819.4 kB/s eta 0:00:00
Downloading numpy-1.26.4-cp310-cp310-win_amd64.whl (15.8 MB)
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 15.8/15.8 MB 2.6 MB/s eta 0:00:00
Installing collected packages: numpy
Successfully installed numpy-1.26.4

However on re-running the command pip install Pystruct. It threw the same error. Even though numpy is installed.