重拾python 三十一

练习if分支语句，ex31.py：

#!/usr/bin/python# -*- coding: utf-8 -*-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 is 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 survives 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!"

每次尝试不同的输入，看看程序如何运行