Python 3 Module of the Week by Doug Hellmann
From the webpage:
PyMOTW-3 is a series of articles written by Doug Hellmann to demonstrate how to use the modules of the Python 3 standard library….
Hellman documents one hundred and thirty-nine (139) modules in the Python standard library.
How many of them can you name?
To improve your score, use Hellman’s list as a one hundred and thirty-nine (139) week lectionary cycle on Python.
Some modules may take less than a week, but some, re — Regular Expressions, will take more than a week.
Even if you don’t finish a longer module, push on after two weeks so you can keep that feeling of progress and encountering new material.