Pip: Traceback running setup.py clean: ModuleNotFoundError: No module named 'setuptools'

[cjerdonek]

It was reported in issue #6634 that when building a wheel using (PEP 517), a traceback displayed when setup.py clean failed was unneeded.

Excerpt:

  Running `pyo3-pack build -i python --no-sdist --bindings=cffi`
  Error: Command '['pyo3-pack', 'build', '-i', 'python', '--no-sdist', '--bindings=cffi']' returned non-zero exit status 1.
  Building wheel for cffi-pure (PEP 517) ... error
  ERROR: Failed building wheel for cffi-pure
  Running setup.py clean for cffi-pure
  Running command /home/konsti/pyo3-pack/venv/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-req-build-sphjswqi/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' clean --all
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
  ModuleNotFoundError: No module named 'setuptools'
  ERROR: Failed cleaning build dir for cffi-pure
Failed to build cffi-pure

[pradyunsg]

:eyes:

You don't have to explain what happened here, but it'd be nice if you do. 😛

[cjerdonek]

I closed this after creating it because when I looked at the code, it seemed like the traceback only displays when verbose mode is enabled, in which case it doesn't really seem like an issue (it's verbose mode). But I'm not 100% sure, so I'll leave it open for completeness for now.

[chrahunt]

This looks like a bug, unless I'm missing something.

1. pep517 build takes place
2. _build_one_pep517 returns None on exception
3. if wheel is None, then execute _clean_one
4. unconditionally execute setup.py clean and log exceptions at error level