Let's use type hints!

[tailaiw]

We like to start using type hints for better practice of python programming. For a first-time contributor, this is probably a nice starting point, as you will go through every part of the code base and familiarize yourself with the code structure.

To-do's:

• Add type hints to all functions.
• Modify docstrings accordingly, so sphinx-autodoc will automatically grab type info from type hints.
• Add unit tests (with mypy?) for type checking.

Have fun!

[roycoding]

WIP in branch type-hints

[Pask423]

Hi,
Is this issue still valid and open, as I would like to try implement it ?
Same for #15