7.8　使用 or

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."