How do I solve a ModuleNotFound error: No module named 'stuff' in VSCode Python 3.10.0

Question

I created a module named stuff, and in stuff folder, I created these files, visual studio code preview

__init__.py, and accum.py

in accum.py I have

class Accumulator:

    def __init__(self):
        self._count = 0
    
    @property
    def count(self):
        return self._count
        
    def add(self, more=1):
        self._count += more

I created a new folder test, and in the test folder I created a file test_accum.py

in test_accum.py file I have

import pytest

from stuff.accum import Accumulator

when I run the Python file it returns:

ModuleNotFoundError: No module named 'stuff'

Answer 1

If you try to run the test module, it fails because it is not in the path like @tromgy explained. However, to run tests you don't need the init files or mess with sys.path.

With pytest, you are not supposed to run the test module itself to run tests, but instead run pytest from command line with python -m pytest tests. Just make sure you are running from your project folder i.e. "tau-intro-to-pytest". If you want to run a specific test function, you can specify that from the command line wtih python -m pytest tests/test_mod.py::test_func, but there are good VS Code extensions to do that without writing lengthy command line calls. The python extension has a tests explorer included in it, but I like the UI of Python Test Explorer for VS Code better.