I have the follwing folder structure of my Python project:
Project is the base directory.

Project     
  |------package1
  |          |--------module1.py
  |          |--------module2.py 
  |------package2
  |          |--------module3.py
  |          |--------module4.py 
  |------Test
  |        |-----test.py

The contents of test.py is:

import package1.module1

When I run test.py, the below error is thrown:

ModuleNotFoundError: No module named 'package1'

I am aware that the package/module search would contain the directory where the script is run.
So in this case, package1 directory path is NOT included; hence the error is thrown.
Adding the path of package1 via sys.path.append() is not a nicer way whenever we do imports.

I see that many projects import modules/packages in the above mentioned way only.
I am wondering how they work actually.

can I get some guidance on how to make the above setup work.

Thanks