[a3n]

Suggestion: a short main() and if __name__ = ... for each file, serving as a demo/smoke test. It doesn't stop you from importing it as a module, and it's nice to see using code.

[felixhummel]

Along the same lines - use doctests maybe?

    if __name__ == "__main__":
        import doctest
        doctest.testmod()

https://docs.python.org/3.5/library/doctest.html

[a3n]

A great idea. But I'd also like to see an all-in-one-place dog and pony show, constructing it and using it right next to each other.

[majke]

Agreed. Such code without decent doctests is close to useless. Also - try to get decent code coverage if you can.