I've just finished publishing all the parts to Python Beginners - Functions:
http://showmedo.com/videos/series?name=4oReffvYq"This series teaches you how to define your own functions in Python. We cover how to write functions, argument passing, scoping, gotchas and nested functions."
This is a Club series aimed at new Python programmers, the series covers:
Overview (Functions)
Defining a Function
Arguments and Return Values 1
Arguments and Return Values 2
Variable Scope
Nested and Private Functions
Cheers,
Ian.