I would recommend Julien Danjou's "The Hacker's Guide to Python". He charges $29 for the PDF, but provides updates every year or so. I think it's a great book for getting more depth out of Python. :)

Topics include: modules/libraries, documentation, distribution, virtual environments, unit testing, methods/decorators, functional programming, optimization, scaling, RDBMS, and more.

https://thehackerguidetopython.com/