ModuleNotFoundError while running unit tests

Question

With such a project structure:

- code
  - modules
    - tests
      test_data_quality_service.py
    data_quality_service.py
  - web

I keep getting errors when I try to import class DataQualityChecker from data_quality_service. I get these erros both for absolute

from code.modules.data_quality_service import DataQualityChecker
E   ModuleNotFoundError: No module named 'code.modules'; 'code' is not a package

and relative imports:

from ..data_quality_service import DataQualityChecker
E   ImportError: attempted relative import with no known parent package

How can I fix it? It's happening in PyCharm, I'm running unit tests and I also tried pytest but I had the same error.

From wich directory are you executing the tests? Did you create `__init__.py` files? — Fran Arenas, Aug 12 '22 at 13:40
Yes, I did. I've changed the project structure a little bit but only adding import sys sys.path.append("..") before imports solved the problem — dark_matter88, Aug 15 '22 at 10:36
That means that you are executing the script in the wrong path. Try to execute the script from the root of the project — Fran Arenas, Aug 15 '22 at 11:02

Fran Arenas · Answer 1 · 2022-08-12T13:49:01.967

1

You need to add an __init__.py file (it can be empty) on each folder to mark it as a python package.

- code
  - modules
    - tests
      test_data_quality_service.py
      __init__.py
    data_quality_service.py
    __init__.py
  - web

Also, probably you should consider a better project structure

edited Aug 12 '22 at 13:49

answered Aug 12 '22 at 13:42

Fran Arenas

score 0 · Answer 2 · answered Aug 12 '22 at 13:46

0

In python installation directory there is file python38._pth You have to give module path code.modules

answered Aug 12 '22 at 13:46

Raja M

This can be done with the flag -m when executing the python script. Btw, with an IDE as pycharm this is not necesary if you use it to execute the code – Fran Arenas Aug 12 '22 at 13:47

2 Answers2