笨办法学Python（learn python the hard way）--练习程序31-35

下面是练习31-练习35，基于python3

 #ex31.py
 1 print("You enter a dark room witn two doors.  Do you go through door #1 or door #2?")

 door = input("> ")

 if door == "":
     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 = input("> ")

     if bear == "":
         print("The bear eats your face off.  Good job!")
     elif bear == "":
         print("The bear eats your legs off.  Good job!")
     else:
         print("Well, doing %s is probably better.  Bear runs away." %bear)

 elif door == "":
     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 = input("> ")

     if insanity == "" or insanity == "":
         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!")

 #ex32.py
 1 the_count = [1, 2, 3, 4, 5]
 fruits = ['apples', 'oranges', 'pears', 'apricots']
 change = [1, 'pennies', 2, 'dimes', 3, 'quarters']

 # this first kind of for-loop goes through a list
 for number in the_count:
     print("This is count %d" % number)

 # same as above
 for fruit in fruits:
     print("A ftuit of type: %s" % fruit)

 # also we can go through mixed lists too
 # notice we have to use %r since we don't know what's in it
 for i in change:
     print("I got %r" % i)

 # we can also build lists, first start with an empty one
 #elements = []

 elements = range(0, 6)
 # then use the range function to do 0 to 5 counts
 #for i in range(0, 6):
    # print("Adding %d to the list." % i)
     # append is a function that lists understand
   #  elements.append(i)

 # now we can print them out too
 for i in elements:
     print("Element was: %d" % i)

 #ex33.py
 1 i = 0
 numbers = []

 while i < 6:
     print("At the top i is %d" % i)
     numbers.append(i)

     i = i + 1
     print("Numbers now: ", numbers)
     print("At the bottom i is %d" % i)

 print("The numbers: ")

 for num in numbers:
     print(num)

 #ex33+.py
 1 # 加分习题
 #函数里边的变量和脚本里边的变量之间是没有连接的
 #所以定义函数必须返回numbers变量并重新给numbers赋值
 def numbers_append(j,k):
     i = 0
     numbers = []
     while i < j:
         print("At the top i is %d" % i)
         numbers.append(i)

         i = i + k
         print("Numbers now: ", numbers)
         print("At the bottom i is %d" % i)
     return numbers

 numbers = numbers_append(6, 1)

 print("The numbers: ")

 for num in numbers:
     print(num)

#ex34.py
1 animals = ['bear', 'tiger', 'penguin', 'zebra']
 bear = animals[1]
 print(bear)

 #ex35.py
 1 #sys.exit() 引发一个 SystemExit异常，若没有捕获这个异常，Python解释器会直接退出；捕获这个异常可以做一些额外的清理工作。0为正常退出，其他数值（1-127）为不正常，可抛异常事件供捕获。
 from sys import exit

 def gold_room():
     print("This room is full of gold.  How much do you take?")

     next = input("> ")
     if "" in next or "" in next:
         how_much = int(next)
     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:
         next = input("> ")

         if next == "take honey":
             dead("The bear looks at you then slaps your face off.")

         elif next == "taunt bear" and not bear_moved:
             print("The bear has moved from the door.  You can go through it now.")
             bear_moved = True

         elif next == "taunt bear" and bear_moved:
             dead("The bear gets pissed off and chews your leg off.")

         elif next == "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?")

     next = input("> ")

     if "flee" in next:
         start()
     elif "head" in next:
         dead("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 right and left.")
     print("Which one do you take?")

     next = input("> ")

     if next == "left":
         bear_room()
     elif next == "right":
         cthulhu_room()
     else:
         dead("You stumble around the room until you starve.")

 start()