I cannot import the module I built for pypi

[snippsat]

You have build it as a package.
Then is your folder named src also part of import.

(my_env) E:\1\my_env
λ pip install catslog
Collecting catslog
  Downloading catslog-1.0.5.tar.gz
Installing collected packages: catslog
  Running setup.py install for catslog ... done
Successfully installed catslog-1.0.5

>>> import src
>>> src.catslog
<module 'src.catslog' from 'E:\\1\\my_env\\lib\\site-packages\\src\\catslog.py'>
>>> help(src.catslog)
Help on module src.catslog in src:

NAME
    src.catslog

FUNCTIONS
    catslog(f)

FILE
    e:\1\my_env\lib\site-packages\src\catslog.py

If it's a singe module can use py_modules=['catslog'] in setup.py,and just drop package.
Eg

# setup.py
from setuptools import setup
 
__author__ = 'you'
 
setup(
   name="catslog",
   version='0.1',
   py_modules=['catslog'],
   description="Something",
   url='',
   author_email='something@',
)

You should always build wheel and not source distributions(sdist).

python setup.py bdist_wheel