How to debug pip install <package name> - debugging

Question

If I want to debug the setup.py file of my package packagename getting installed via "pip install packagename" , is there a way to do so? I have tried downloading the source, adding set_trace() in setup.py and run:
pip install .
However, as soon I get pdb() prompt, the install fails with error:
processing /Users/skauser/python-ibmdb/IBM_DB/ibm_db
Complete output from command python setup.py egg_info:
> /private/var/folders/b6/pmddncpn77550p8_g9kkx9f40000gp/T/pip-req-build-_fg8s5a2/setup.py(31)<module>()
-> machine_bits = 8 * struct.calcsize("P")
(Pdb)
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/private/var/folders/b6/pmddncpn77550p8_g9kkx9f40000gp/T/pip-req-build-_fg8s5a2/setup.py", line 31, in <module>
machine_bits = 8 * struct.calcsize("P")
File "/private/var/folders/b6/pmddncpn77550p8_g9kkx9f40000gp/T/pip-req-build-_fg8s5a2/setup.py", line 31, in <module>
machine_bits = 8 * struct.calcsize("P")
File "/Library/anaconda3/lib/python3.7/bdb.py", line 88, in trace_dispatch
return self.dispatch_line(frame)
File "/Library/anaconda3/lib/python3.7/bdb.py", line 113, in dispatch_line
if self.quitting: raise BdbQuit
bdb.BdbQuit
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/b6/pmddncpn77550p8_g9kkx9f40000gp/T/pip-req-build-_fg8s5a2/
Although I can debug the source via: python setup.py build, the behavior that I want to debug is applicable when installed through pip.

Answer 1

Pip is a python program. You can see it's content with cat $(which pip). Then you can copy it to a new file in your project's directory. For example, here is how it looks like for me:
File mypip.py:
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import re
import sys
from pip._internal.cli.main import main
if __name__ == '__main__':
sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
sys.exit(main())
Then you can add a breakpoint with pdb or use PyCharm as mentioned in the answer from Igor Yudnikov.
For reference, this is how it to looks like in my Pycharm

Answer 2

Oh! Just found a solution, its pretty easy. What is pip? It's a plain python file, which is I think somehow bound to run via python, and under the hood system makes something like
python pip install ...
so, at first we need to know where is pip
which pip
says
/Users/me/PycharmProjects/etlscripts/venv/bin/pip
So, we may go to Pycharm, create config like
then you'll be able to catch your exception. Cheers.