ex41习题 41: 来自 Percal 25 号行星的哥顿人(Gothons)

ex41习题 41: 来自 Percal 25 号行星的哥顿人(Gothons)

学习到本题卡住了，遇到一点费解的地方，mark一下。本题主要是介绍函数在字典这种数据类型中的应用，本实验在python3环境下进行。

from sys import exit
from random import randint

def death():
    quitps = ["You died. You kinda suck at this.",
              "Nice job, you died ...jackass.",
              "Such a luser.",
              "I have a small puppy that's better at this."]
    print (quitps[randint(0,len(quitps)-1)])
    exit(1)

def central_corridor():
    print ("The Gothons of Planet Percal #25 have invaded your ship and destroyed")
    print ("your entire crew. You are the last surviving member and your last")
    print ("mission is to get the neutron destruct bomb from the Weapons Armory,")
    print ("put it in the bridge, and blow the ship up after getting into an ")
    print ("escape pod.")
    print ("\n")
    print ("You're running down the central corridor to the Weapons Armory when")
    print ("a Gothon jumps out, red scaly skin, dark grimy teeth, and evil clown costume")
    print ("flowing around his hate filled body. He's blocking the door to the")
    print ("Armory and about to pull a weapon to blast you.")

    action = input("> ")

    if action == "shoot!":
        print ("""Quick on the draw you yank out your blaster and fire it at the Gothon.
                His clown costume is flowing and moving around his body, which throws
               off your aim. Your laser hits his costume but misses him entirely. This
               completely ruins his brand new costume his mother bought him, which
               makes him fly into an insane rage and blast you repeatedly in the face until"
               you are dead. Then he eats you.""")
        return 'death'
    elif action == "dodge!":
        print ("""Like a world class boxer you dodge, weave, slip and slide right
                  as the Gothon's blaster cranks a laser past your head.
                  In the middle of your artful dodge your foot slips and you"
                  bang your head on the metal wall and pass out.
                  You wake up shortly after only to die as the Gothon stomps on
                  your head and eats you.""")
        return 'death'

    elif action == "tell a joke":
        print ("""Lucky for you they made you learn Gothon insults in the academy.
               You tell the one Gothon joke you know:
               Lbhe zbgure vf fb sng, jura fur fvgf nebhaq gur ubhfr, fur fvgf nebhaq gur ubhfr.
               The Gothon stops, tries not to laugh, then busts out laughing and can't move.
               While he's laughing you run up and shoot him square in the head
               putting him down, then jump through the Weapon Armory door.""")
        return 'laser_weapon_armory'

    else:
        print ("Dose not compute!")
        return 'central_corridor'

def laser_weapon_armory():
    print ("""You do a dive roll into the Weapon Armory, crouch and scan the room
              for more Gothons that might be hiding. It's dead quiet, too quiet.
              You stand up and run to the far side of the room and find the
              neutron bomb in its container. There's a keypad lock on the box
              and you need the code to get the bomb out. If you get the code
              wrong 10 times then the lock closes forever and you can't
              get the bomb. The code is 3 digits.""")
    code = "%d%d%d" % (randint(1,9), randint(1,9), randint(1,9))
    guess = input("[keypad]>")
    guesses = 0

    while guess != code and guesses <10:
        print ("BZZZZEDDD!")
        guesses += 1
        guess = input("[keypad]>")

    if guess == code:
        print ("""The container clicks open and the seal breaks, letting gas out.
               You grab the neutron bomb and run as fast as you can to the
               bridge where you must place it in the right spot.""")
        return 'the_bridge'
    else:
        print ("""The lock buzzes one last time and then you hear a sickening
                melting sound as the mechanism is fused together.
                You decide to sit there, and finally the Gothons blow up the
                ship from their ship and you die.""")
        return 'death'

def the_bridge():
       print ("""You burst onto the Bridge with the neutron destruct bomb
              under your arm and surprise 5 Gothons who are trying to
              take control of the ship. Each of them has an even uglier
              clown costume than the last. They haven't pulled their
              weapons out yet, as they see the active bomb under your
              arm and don't want to set it off.""")

       action = input(">")

       if action == "throw the bomb":
           print ("""In a panic you throw the bomb at the group of Gothons
                  and make a leap for the door. Right as you drop it a
                  Gothon shoots you right in the back killing you.
                  As you die you see another Gothon frantically try to disarm
                  the bomb. You die knowing they will probably blow up when
                  it goes off.""")
           return 'death'
       elif action == "slowly place the bomb":
            print ("""You point your blaster at the bomb under your arm
                   and the Gothons put their hands up and start to sweat.
                   You inch backward to the door, open it, and then carefully
                   place the bomb on the floor, pointing your blaster at it.
                   You then jump back through the door, punch the close button
                   and blast the lock so the Gothons can't get out.
                   Now that the bomb is placed you run to the escape pod to
                   get off this tin can.""")
            return 'escape_pod'
       else:
            print ("DOES NOT COMPUTE!")
            return "the_bridge"

def escape_pod():
    print ("""You rush through the ship desperately trying to make it to
           the escape pod before the whole ship explodes. It seems like
           hardly any Gothons are on the ship, so your run is clear of
           interference. You get to the chamber with the escape pods, and
           now need to pick one to take. Some of them could be damaged
           but you don't have time to look. There's 5 pods, which one
           do you take?""")

    good_pod = randint(1,5)
    guess = input("[pod #]>")

    if int(guess) != good_pod:
        print ("You jump into pod %s and hit the eject button." % guess)
        print ("""The pod escapes out into the void of space, then
               implodes as the hull ruptures, crushing your body
               into jam jelly.""")
        return 'death'
    else:
        print("You jump into pod %s and hit the eject button." % guess)
        print ("The pod easily slides out into space heading to")
        print ("the planet below. As it flies to the planet, you look")
        print ("back and see your ship implode then explode like a")
        print ("bright star, taking out the Gothon ship at the same")
        print ("time. You won!")
        exit(0)

ROOMS = {'death': death,
         'central_corridor': central_corridor,
         'laser_weapon_armory': laser_weapon_armory,
         'the_bridge': the_bridge,
         'escape_pod': escape_pod}

def runner(map, start):
    next = start

    while True:
        room = map[next]
        print ("\n--------")
        next = room()

runner(ROOMS, 'central_corridor')

runner 将 ROOMS 和central_corridor作为参数传入（map, start）；

next作为字符串变量接收start的值；

在while循环中

room = map[next] 从字典map中查找next所对应的值，此值当前为函数，赋给room，此时room为函数。

next = room() 此时根据room函数的返回结果对next进行赋值，再进行循环。