or 关键字也是用来把多个条件放在一起。如果使用 or，只要任意一个条件为真，就会执行代码块。
color = raw_input("Enter your favorite color: ")if color == "red" or color == "blue" or color == "green": print "You are allowed to play this game."else: print "Sorry, you can't play the game."