This is much more helpful than I could have imagined. The writing is concise with solid, insightful examples. I read a few introductory Python texts before (Learn Python the Hard Way etc) that are really a waste of time if you understand programming concepts.

definition for protester: "dissenter: a person who dissents from some established policy."

definition for rioter: "troublemaker who participates in a violent disturbance of the peace; someone who rises up against the constituted authority."

sounds like these were rioters http://www.pbs.org/wgbh/aia/part2/2h48b.html