Learn Python The Hard Way学习(31) - 作出选择

Learn Python The Hard Way学习(31) - 做出选择
在以前的练习中，我们一直在打印和调用函数，所有的程序都是至上而下执行的。如果你写了一个函数，执行的时候需要你自己选择执行哪个分支，现在我们就可以用if，else和elif实现这。
上一个练习只是一些简单的问答集，下面的练习我们提出问题，并且由用户自己选择答案。print "You enter a dark room with two doors. Do you go through door #1 or door #2?"door = raw_input("> ")if door == "1": print "There's a giant bear here eating a cheese cake, What do you do?" print "1. Take the cake." print "2. Scream at the bear." bear = raw_input("> ") if bear == "1": print "The bear eats your face off. Good job!" elif bear == "2": print "The bear eats your legs off. Good job!" else: print "Well, doing %s id probably better. Bear runs away." % bearelif door == "2": print "You stare into the endless abyss at Cthulhu's retina." print "1. Blueberries." print "2. Yellow jacket clothespins." print "3. Understanding revolvers yelling melodies." insanity = raw_input("> ") if insanity == "1" or insanity == "2": print "Your body survies powered by a mind of jello. Good job!" else: print "The insanity rots your eyes into a pool of muck. Good job!"else: print "You stumble around and fall on a knife and die. Good job!"

这么代码的重点是if语句里面包含if语句，这种嵌套非常的强大和常用。
运行结果root@he-desktop:~/mystuff# python ex31.py You enter a dark room with two doors. Do you go through door #1 or door #2?> 1There's a giant bear here eating a cheese cake, What do you do?1. Take the cake.2. Scream at the bear.> 1     The bear eats your face off. Good job!root@he-desktop:~/mystuff# python ex31.py You enter a dark room with two doors. Do you go through door #1 or door #2?> 2You stare into the endless abyss at Cthulhu's retina.1. Blueberries.2. Yellow jacket clothespins.3. Understanding revolvers yelling melodies.> 1Your body survies powered by a mind of jello. Good job!root@he-desktop:~/mystuff# 
加分练习扩展上面的游戏，添加一些新的判断。