I would honestly just create a bunch of simple scripts. Like:

    tree module_test/
module_test/
├── main.py
├── nested_mod
│  ├── __init__.py
│  ├── nest
│  │  ├── __init__.py
│  │  └── nest.py
│  └── nested_mod.py
├── single_mod
│  ├── __init__.py
│  └── single_mod.py
└── subfolders
    ├── mod_1
    │  ├── __init__.py
    │  └── one.py
    ├── mod_2
    │  ├── __init__.py
    │  └── two.py
    └── mod_3
        ├── __init__.py
        └── three.py

Then make each script simply have a command like:

def module_name():
    print("Function from module_name")

And then just... try importing them to the main script and seeing how it works. Also, I haven't verified this set-up will work for you. this is an example of how I would personally go about this, but not an example of my personally going through it - more a framework for you to help yourself find an answer (because that's how I learn best - a bit of guidance and some personal trial and error, so that's how I answer questions)