Python, for all its power and popularity, has long lacked a form of flow control found in other languages—a way to take a value and match it elegantly against one of a number of possible conditions.

Receive a 15% discount on “Machine Vision: Theory, Algorithms, Practicalities” by ordering from www.elsevierdirect.com and using offer code 92839. [Part 1 of this article begins with a look at the ...