adding type hints to one of my projects, things learned

[Ethan Furman]

Thank you for that write-up!  I haven't used type hints, fearing pretty much the obstacles you ran into.

The only thing I can (partially) offer is a tool, written by Google I believe, that parses and annotates code with the 
types the code is /currently/ working with.  I say partially because I cannot find it at the moment... ah ha!  found it!

   https://github.com/google/pytype

--
~Ethan~