python 文档字符串打印机问题

Question

我正在努力学习 Zed Shaw 的 LPTHW，但在(新)练习 43 Extra Credit 3 中遇到了障碍。

所以我在这里尝试创建一个函数，打印另一个函数，它是一个大文档字符串。

这是引擎

class Game(object):

    def __init__(self, start):
        self.quips = [
            "You died.  You kinda suck at this.",
            "Your mom would be proud. If she were smarter.",
            "Such a luser.",
            "I have a small puppy that's better at this."
        ]
        self.start = start

    def play(self):
        # next_room_name is taken from init argument start
        next_room_name = self.start

        while True:
            print "\n--------"
            # set variable room to get function from next_room_name
            room = getattr(self, next_room_name)
            # unpacks function from next_room_name into room
            next_room_name = room()

            room = current_room
            print current_room.__doc__

下面是我尝试调用以启动游戏的一些函数。

    def central_corridor(self):
        """
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 = raw_input("> ")

        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'

这是它在主程序中的调用方式

a_game = Game("central_corridor")
a_game.play()

但我得到的只是

--------
> 

编辑:为了成功完成练习，我需要编辑引擎以打印出文档字符串，而不是编辑函数。

Answer 1

按照你现在的方式，current_room 永远不会改变，所以它总是会打印 current_room 的初始值的文档字符串，如果有的话。

看来你根本不需要current_room。您可以删除行 room = current_room 并只写:

print room.__doc__

编辑:我查看了actual exercise显然 central_corridor 中的内容比您在问题中显示的要多 - 它要求用户输入。由于您希望在用户输入之前显示文档字符串，因此您应该在 调用 room() 之前打印文档字符串。