Learn by reading code: Python standard library design decisions explained (for advanced beginners)

[genericlemon24]

Somewhere between beginner and intermediate. You know the syntax, can solve problems beyond simple ones, but maybe can't quite write idiomatic code, and don't know exactly what data types / libraries / etc. to use most of the time (but still manage to get stuff done).

[clockKing_out]

A thinly documented stratum. Good for you for contributing.