LinkedIn Courses
LEARNING PATH: Become a Python Developer, 14 courses with a total time of 29 hours including some generic programming courses. Some of the courses expand on topics introduced in Python Essentail Tranining.
COURSE: Python Generators, this is a very short course at just 44 minutes and is one of the topics introduced in Python Essential Training but this is not included in the Become a Python Developer Learning Path.
Online Articles
Python - Method Overloading. An interesting article relating to how Python approaches method overloading or perhaps more accurately, how to counter the fact that Python doesn't really support method overloading.
Documentation
The latest online documentation at python.org.