分支和函數(shù)

• 輸入：

# -*- coding: utf-8 -*-

from sys import exit

def gold_room():
    print "This room is full of gold. How much do you take?"
    
    choice = raw_input("> ")
    if "0"  in choice or "1" in choice:
        how_much = int(choice)
    else:
        dead("Man, learn to type a number.")
        
    if how_much < 50:
        print "Nice, you're not greedy, you win!"
        exit(0)
    else:
        dead("You greedy bastard!")

def bear_room():
    print "There is a bear here."
    print "The bear has a bunch of honey."
    print "The fat bear is in front of another door."
    print "How are you going to move the bear?"
    bear_moved = False
    
    while True:
        choice = raw_input("> ")
        
        if choice == "take honey":
            dead("The bear looks at you then slaps your face off.")
        elif choice == "taunt bear" and not bear_moved:
            print "The bear has moved from the door. You can go through it now."
            bear_moved = True
        elif choice == "taunt bear" and bear_moved:
            dead("The bear gets pissed off and chews your leg off.")
        elif choice == "open door" and bear_moved:
            gold_room()
        else:
            print "I got no idea what that means."

def cthulhu_room():
    print "Here you see the great evil Cthulhu."
    print "He, it, whatever stares at you and you go insane."
    print "Do you flee for your life or eat your head?"
    
    choice = raw_input("> ")
    
    if "flee" in choice:
        start()
    elif "head" in choice:
        head("Well that was tasty!")
    else:
        cthulhu_room()

def dead(why):
    print why, "Good job!"
    exit(0)
    
def start():
    print "You are in a dark room."
    print "There is a door to your righr and left."
    print "Which one do you take?"
    
    choice = raw_input("> ")
    
    if choice == "left":
        bear_room()
    elif choice == "right":
        cthulhu_room()
    else:
        dead("You stumble around the room until you starve.")
        
start()

• 運行：

  
  

附加題

• 這個 gold_room 游戲使用了奇怪的方式讓你鍵入數(shù)字。這種方式會導致什么樣的 bug？ 你可以用比檢查 0、1 更好的方式判斷輸入是否是數(shù)字嗎？int() 這個函數(shù)可以給你一些頭緒。

這里用了一個判斷輸入的數(shù)字是否含1或者0來檢查是否輸入的是數(shù)字，很明顯的bug就是避開0和1的數(shù)字會被當作非數(shù)字來執(zhí)行，例如輸入55

》》》初步的想法，檢測數(shù)字的話，用四則運算最直接，比如15/15=1，于是代碼改為：

def gold_room():
    print "This room is full of gold. How much do you take?"
    choice = raw_input("> ")
    if int(choice) / int(choice) == 1:
        how_much = int(choice)
    else:
        dead("Man, learn to type a number.")
        
    if how_much < 50:
        print "Nice, you're not greedy, you win!"
        exit(0)
    else:
        dead("You greedy bastard!")