setuptools version

setuptools == 58.5.3

Python version

Python 3.9

OS

macOS

Additional environment information

No response

Description

When I try topip install <namespace-package> usingattr to determine the value of version I get a failure message.

Expected behavior

Thepip install <namespace-package> command works successfully.

How to Reproduce

I have created an example to show this behaviour:

1. Clone repo.https://github.com/hsorby/setuptools-issue
2. Create virtual environment:python -m venv issue
3. Activate:source issue/bin/activate
4. cd setuptools-issue
5. Installanimals.cat package:pip install animals.cat/
6. Installanimals.dog package:pip install animals.dog/

This will fail becauseModuleNotFoundError: No module named 'animals.dog'

If I now uninstallanimals.cat:pip uninstall animals.cat and then repeat steps 5. and 6. they will succeed, I'm guessing because something has been leftover from the uninstall?

Output

    File "<frozen importlib._bootstrap>", line 1030, in _gcd_import    File "<frozen importlib._bootstrap>", line 1007, in _find_and_load    File "<frozen importlib._bootstrap>", line 984, in _find_and_load_unlocked  ModuleNotFoundError: No module named 'animals.dog'  ----------------------------------------

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