[BUG] `pip install -e` broken since setuptools==60.0.0

setuptools version

Since setuptools==60.0.0

Python version

3.7.13

OS

Ubuntu 18.04

Additional environment information

No response

Description

I have a python library in local, which I'm developing. Therefore, I'm interested in installing it with pip install -e as I've always done, to develop it while it's installed.

However, today I updated setuptools from 46.1.3 to the newest (62.1.0) and I realized that even if pip install -e /path/to/my/lib reports no error in output, but I cannot import the library in python.

I've tracked down the version that broke this and it looks like it's 60.0.0.

Install setuptools==59.8.0:

root@7a13ec49fbba:~# pip install --upgrade setuptools==59.8.0
Collecting setuptools==59.8.0
  Using cached setuptools-59.8.0-py3-none-any.whl (952 kB)
Installing collected packages: setuptools
Successfully installed setuptools-59.8.0
WARNING: You are using pip version 20.2.2; however, version 22.0.4 is available.
You should consider upgrading via the '/usr/bin/python3 -m pip install --upgrade pip' command.

Install library with pip install -e:

root@7a13ec49fbba:~# pip install -e work/ner
Obtaining file:///root/work/ner
Installing collected packages: ner
  Running setup.py develop for ner
Successfully installed ner
WARNING: You are using pip version 20.2.2; however, version 22.0.4 is available.
You should consider upgrading via the '/usr/bin/python3 -m pip install --upgrade pip' command.

Try to import library in python:

root@7a13ec49fbba:~# python3
Python 3.7.13 (default, Apr 24 2022, 01:04:09) 
[GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import ner
>>> ner.__version__
'1.0.0'

It works with setuptools==59.8.0.

Now let's do the same with setuptools==60.0.0:

root@7a13ec49fbba:~# pip install --upgrade setuptools==60.0.0
Collecting setuptools==60.0.0
  Downloading setuptools-60.0.0-py3-none-any.whl (952 kB)
Installing collected packages: setuptools
Successfully installed setuptools-60.0.0
WARNING: You are using pip version 20.2.2; however, version 22.0.4 is available.
You should consider upgrading via the '/usr/bin/python3 -m pip install --upgrade pip' command.

Install library with pip install -e:

root@7a13ec49fbba:~# pip install -e work/ner
Obtaining file:///root/work/ner
Installing collected packages: ner
  Running setup.py develop for ner
Successfully installed ner
WARNING: You are using pip version 20.2.2; however, version 22.0.4 is available.
You should consider upgrading via the '/usr/bin/python3 -m pip install --upgrade pip' command.

Try to import library in python:

root@7a13ec49fbba:~# python3
Python 3.7.13 (default, Apr 24 2022, 01:04:09) 
[GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import ner
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'ner'

Expected behavior

The installed library via pip install -e should be able to be imported like with setuptools < 60

How to Reproduce

1. Install setuptools>60 via pip install setuptools==60.0.0
2. Download a library to install it in local. e.g. via git clone https://github.com/ivsanro1/gft-ner
3. Try to install library via pip install -e. e.g. pip install -e ~/repos/gft-ner
4. Try to import the library in python, via python3 -c "import ner"

Output

root@7a13ec49fbba:~# pip install setuptools==60.0.0
Collecting setuptools==60.0.0
  Using cached setuptools-60.0.0-py3-none-any.whl (952 kB)
Installing collected packages: setuptools
Successfully installed setuptools-60.0.0
WARNING: You are using pip version 20.2.2; however, version 22.0.4 is available.
You should consider upgrading via the '/usr/bin/python3 -m pip install --upgrade pip' command.
root@7a13ec49fbba:~# cd repos/
root@7a13ec49fbba:~/repos# git clone https://github.com/ivsanro1/gft-ner
Cloning into 'gft-ner'...
remote: Enumerating objects: 60, done.
remote: Counting objects: 100% (60/60), done.
remote: Compressing objects: 100% (33/33), done.
remote: Total 60 (delta 21), reused 60 (delta 21), pack-reused 0
Unpacking objects: 100% (60/60), done.
root@7a13ec49fbba:~/repos# cd ..
root@7a13ec49fbba:~# pip install -e repos/gft-ner
Obtaining file:///root/repos/gft-ner
Installing collected packages: ner
  Running setup.py develop for ner
Successfully installed ner
WARNING: You are using pip version 20.2.2; however, version 22.0.4 is available.
You should consider upgrading via the '/usr/bin/python3 -m pip install --upgrade pip' command.
root@7a13ec49fbba:~# python3 -c "import ner"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'ner'

Reproduce the failure with setuptools==60.0.0 using the gft-ner example and the pip install -e command; compare it with setuptools==59.8.0. Start at the setup.py develop path shown in the output, and consider the issue done when the editable installation succeeds and python3 -c "import ner" works with setuptools 60.0.0.