I am writing to you because I have a problem importing my python modules.
This is the structure of my project:

project structure

Specifically, when i specify inside the main.py this: from instruments.guitar import song_bp , then I obtain the following when I try to execute the app:

ModuleNotFoundError: No module named ...

The same error happens when i try to import in guitar.py the module piano.py, in this way: import piano

I have already set my env and all the necessary thing, so I don’t understand what is the problem.