Reading the source of libraries I'm using has been a real eye-opener for me. Even from very good documentation you can only learn how to use it, not learn how to write something similar yourself.
PyCharm is amazing help for it as well. Control-click on a function or class, and you will jump into its definition in the library source.
PyCharm is amazing help for it as well. Control-click on a function or class, and you will jump into its definition in the library source.