I was working on this. I think i got the basics of slicing understood. by the way, for a beginner, udacity it pretty cool!
http://www.udacity.com/view#Course/cs101/CourseRev/apr2012/Unit/671054/Nugget/964001 Read More
The Python's slicing operator can be used with any indexed sequence like strings, lists, ...
syntax --> seq[begin : end : step]
step is optional
defaults are index begin=0, index end=len(seq)-1, step=1
step = -1 reverses sequence