Consider using pip and requirements.txt for dependencies

[patcon]

I see that you're using submodules to manage external libraries and packages. I'm not a python dev, but my experience is that package managers tend to make projects much more transparent and easier to maintain.

pip allows you to pull in official packages, but also host your own custom ones on github:
https://devcenter.heroku.com/articles/python-pip#git-backed-distributions

As I said, I'm not a python developer, but happy to help if I can. Lemme know