python - 艰难地学习 Python ex41 额外学分

Question

我通过 LPTHW 的方式努力，并且在练习 41 的额外学分上卡住了:

Extra Credit:

1. Add cheat codes to the game so you can get past the more difficult rooms.
2. Instead of having each function print itself, learn about “doc string” style comments. Write the room description as doc comments, and change the runner to print them.
3. Once you have doc comments as the room description, do you need to have the function prompt even? Have the runner prompt the user, and pass that in to each function. Your functions should just be if-statements printing the result and returning the next room.

据我所知，到目前为止使用这样的文档字符串是不受欢迎的，但这是我想出的:

from sys import exit
from random import randint

globvar = ''

def death():
    quips = ["You died.  You kinda suck at this.",
             "Nice job, you died ...jackass.",
             "Such a loser.",
             "I have a small puppy that's better at this."]

    print quips[randint(0, len(quips)-1)]
    exit(1)


def central_corridor():
    """The Gothons of Planet Percal #25 have invaded your ship and destroyed
    your entire crew.  You are the last surviving member and your last
    mission is to get the neutron destruct bomb from the Weapons Armory,
    put it in the bridge, and blow the ship up after getting into an 
    escape pod.

    You're running down the central corridor to the Weapons Armory when
    a Gothon jumps out, red scaly skin, dark grimy teeth, and evil clown costume
    flowing around his hate filled body.  He's blocking the door to the
    Armory and about to pull a weapon to blast you.
    """

    action = globvar

    if action == "shoot!":
        print "Quick on the draw you yank out your blaster and fire it at the Gothon."
        print "His clown costume is flowing and moving around his body, which throws"
        print "off your aim.  Your laser hits his costume but misses him entirely.  This"
        print "completely ruins his brand new costume his mother bought him, which"
        print "makes him fly into an insane rage and blast you repeatedly in the face until"
        print "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"
        print "as the Gothon's blaster cranks a laser past your head."
        print "In the middle of your artful dodge your foot slips and you"
        print "bang your head on the metal wall and pass out."
        print "You wake up shortly after only to die as the Gothon stomps on"
        print "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."
        print "You tell the one Gothon joke you know:"
        print "Lbhe zbgure vf fb sng, jura fur fvgf nebhaq gur ubhfr, fur fvgf nebhaq gur ubhfr."
        print "The Gothon stops, tries not to laugh, then busts out laughing and can't move."
        print "While he's laughing you run up and shoot him square in the head"
        print "putting him down, then jump through the Weapon Armory door."
        return 'laser_weapon_armory'

    else:
        print "DOES NOT COMPUTE!"
        return 'central_corridor'

def laser_weapon_armory():
    """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 = globvar
    guesses = 0
    cheat = '007'

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

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


def the_bridge():
    """You burst onto the Bridge with the netron 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 = globvar

    if action == "throw the bomb":
        print "In a panic you throw the bomb at the group of Gothons"
        print "and make a leap for the door.  Right as you drop it a"
        print "Gothon shoots you right in the back killing you."
        print "As you die you see another Gothon frantically try to disarm"
        print "the bomb. You die knowing they will probably blow up when"
        print "it goes off."
        return 'death'

    elif action == "slowly place the bomb":
        print "You point your blaster at the bomb under your arm"
        print "and the Gothons put their hands up and start to sweat."
        print "You inch backward to the door, open it, and then carefully"
        print "place the bomb on the floor, pointing your blaster at it."
        print "You then jump back through the door, punch the close button"
        print "and blast the lock so the Gothons can't get out."
        print "Now that the bomb is placed you run to the escape pod to"
        print "get off this tin can."
        return 'escape_pod'
    else:
        print "DOES NOT COMPUTE!"
        return "the_bridge"

def escape_pod():
    """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 = globvar
    great_pod = 1

    if int(guess) == good_pod:
        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)
    elif int(guess) == great_pod:
        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)
    else:
        print "You jump into pod %s and hit the eject button." % guess
        print "The pod escapes out into the void of space, then"
        print "implodes as the hull ruptures, crushing your body"
        print "into jam jelly."
        return 'death'


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


def runner(themap, start):
    next = start

    while True:
        ## Global variable in order to pass prompt value to rooms        
        global globvar

        room = themap[next]

        print "\n--------"
        print room.__doc__

        ## Room dependent prompts

        if room == laser_weapon_armory:
            prompt = raw_input("[keypad]> ")
        elif room == escape_pod:
            prompt = raw_input("[pod #]> ")
        elif room == death:
            return 'death'
        else:
            prompt = raw_input("> ")

        ## Set raw_input from prompt to Global variable (globvar)
        globvar = prompt

        next = room()

runner(ROOMS, 'central_corridor')

除“return 'death'”外，一切正常。它只是在打印以下内容后退出:

--------
None

在靠近底部的 runner 函数中，我认为添加 'elif room == death:' 位会像没有它一样工作，它只是挂起等待 raw_input() 然后打印一个随机的 'quip'，因为它应该在之后我按 ENTER。有人可以帮助我了解我所缺少的吗？任何帮助表示赞赏!

编辑感谢一些快速的反馈，这就是我得到的，尽管 rocksportrocker 的解决方案更简单:

def runner(themap, start):
    next = start

    while True:
        ## Global variable in order to pass prompt value to rooms        
        global globvar

        room = themap[next]

        ## Room dependent prompts

        if room == laser_weapon_armory:
            print "\n--------"
            print room.__doc__
            prompt = raw_input("[keypad]> ")
        elif room == escape_pod:
            print "\n--------"
            print room.__doc__
            prompt = raw_input("[pod #]> ")
        elif room == the_bridge:
            print "\n--------"
            print room.__doc__
            prompt = raw_input("> ")
        elif room == central_corridor:
            print "\n--------"
            print room.__doc__
            prompt = raw_input("> ")
        else:
            pass

        ## Set raw_input from prompt to Global variable (globvar)
        globvar = prompt

        next = room()

Answer 1

death 没有文档字符串。如果 room==death 然后 print room.__doc__ 打印 None。在下面的 if/elifs 中，您从函数 runnner 返回，这导致程序结束。

如果您添加缺少的文档字符串并且您将 runner() 中的 return "death" 替换为简单的 "pass”，或者省略相应的 elif 子句。