各位 Python 大神，帮忙看看这段代码哪里有问题，一直报错。

[Shaowen]

这是 Learn Python The Hard Way 的练习 43。

from sys import exit from random import randint from textwrap import dedent

class Scene(object):

def enter(self):
    print("This scene is not yet configured.")
    print("Subclass it and implement enter().")
    exit(1)

class Engine(object):

def __init__(self, scene_map):
    self.scene_map = scene_map

def play(self):
    current_scene = self.scene_map.opening_scene()
    last_scene = self.scene_map.next_scene('finished')

    while current_scene != last_scene:
        next_scene_name = current_scene.enter()
        current_scene = self.scene_map.next_scene(next_scene_name)

    # be sure to print out the last scene
    current_scene.enter()

class Death(Scene): 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.", "You're worse than your Dad's hokes." ]

def enter(self):
    print(Death.quips[randint(0, len(self.quips) - 1)])
    exit(1)

class CentralCorridor(Scene):

def enter(self):
    print(dedent("""
         The Gothons of Planet #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 = input("> ")

    if action == "shoot!":
        print(dedent("""
            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(dedent("""
            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(dedent("""
            Lucky for you they make 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("DOES NOT COMPUTE!")
        return 'central_corridor'

class LaserWeaponArmory(Scene):

def enter(self):
    print(dedent("""
          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 = f"{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(dedent("""
            The conrainer clicks open and seal breaks, letting
            gas out. You grab the newtron 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(dedent("""
            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'

class TheBridge(Scene):

def enter(self):
    print(dedent("""
          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
          clowm 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(dedent(""" 
              59 In a panic you throw the bomb at the group of Gothons 
              60 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(dedent("""
              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"

class EscapePod(Scene):

def enter(self):
    print(dedent("""
          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(dedent("""
              You jump into pod {guess} and hit eject button.
              The pod escapes out into the void of space, then
              implodes are the hull ruptures, crushing your body into
              jam jelly.
              """))
        return 'death'

    else:
        print(dedent("""
              You jump into pod {guess} and hit the eject button.
              The pod easily slides out into space heading to the
              planet below. As it files to the planet, you look 
              back and see your ship implode then explode like a
              bright star, taking out the Gothon ship at the same 
              time. You won!
              """))

        return 'finished'

class Finished(Scene):

def enter(self):
    print("You won! Good job.")
    return 'finished'

class Map(object): scenes = { 'central_corridor': CentralCorridor(), 'laser_weapon_armory': LaserWeaponArmory(), 'the_bridge': TheBridge(), 'escape_pod': EscapePod(), 'death': Death(), 'finished': Finished(), }

def __init__(self, start_scene):
    self.start_scene = start_scene

def next_scene(self, scene_name):
    val = Map.scenes.get(scene_name)
    return val

def opening_scene(self):
    return self.next_scene(self.start_scene)

a_map = Map('cantral_corridor') a_game = Engine(a_map) a_game.play()

[Shaowen]

def play(self):
current_scene = self.scene_map.opening_scene()
last_scene = self.scene_map.next_scene('finished')

while current_scene != last_scene:
next_scene_name = current_scene.enter()
current_scene = self.scene_map.next_scene(next_scene_name)

这一段一直报 AttributeError: 'NoneType' object has no attribute 'enter'

[jingniao]

不想吐槽，楼下呢？

[jingniao]

debug 不就是回溯么，好吧语气有点重了
pdb 一层一层看，有更好的办法楼下继续

[hackerwin7]

你 map get 出来没有对应的 scene，建议打印下 next_scene 里面 要 get 的 scene_name 和 map 现有的 scenes

[ooh]

correct a spelling mistake: cantral_corridor to central_corridor

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import exit
from random import randint
from textwrap import dedent


class Scene(object):
def enter(self):
print("This scene is not yet configured.")
print("Subclass it and implement enter().")
exit(1)


class Engine(object):
def __init__(self, scene_map):
self.scene_map = scene_map

def play(self):
current_scene = self.scene_map.opening_scene()
last_scene = self.scene_map.next_scene('finished')

while current_scene != last_scene:
next_scene_name = current_scene.enter()
current_scene = self.scene_map.next_scene(next_scene_name)

# be sure to print out the last scene
current_scene.enter()


class Death(Scene):
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.",
"You're worse than your Dad's hokes."
]

def enter(self):
print(Death.quips[randint(0, len(self.quips) - 1)])
exit(1)


class CentralCorridor(Scene):
def enter(self):
print(dedent("""
The Gothons of Planet #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 = input("> ")

if action == "shoot!":
print(dedent("""
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(dedent("""
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(dedent("""
Lucky for you they make 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("DOES NOT COMPUTE!")
return 'central_corridor'


class LaserWeaponArmory(Scene):
def enter(self):
print(dedent("""
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 = f"{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(dedent("""
The conrainer clicks open and seal breaks, letting
gas out. You grab the newtron 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(dedent("""
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'


class TheBridge(Scene):
def enter(self):
print(dedent("""
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
clowm 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(dedent("""
59 In a panic you throw the bomb at the group of Gothons
60 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(dedent("""
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"


class EscapePod(Scene):
def enter(self):
print(dedent("""
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(dedent("""
You jump into pod {guess} and hit eject button.
The pod escapes out into the void of space, then
implodes are the hull ruptures, crushing your body into
jam jelly.
"""))
return 'death'

else:
print(dedent("""
You jump into pod {guess} and hit the eject button.
The pod easily slides out into space heading to the
planet below. As it files to the planet, you look
back and see your ship implode then explode like a
bright star, taking out the Gothon ship at the same
time. You won!
"""))

return 'finished'


class Finished(Scene):
def enter(self):
print("You won! Good job.")
return 'finished'


class Map(object):
scenes = {
'central_corridor': CentralCorridor(),
'laser_weapon_armory': LaserWeaponArmory(),
'the_bridge': TheBridge(),
'escape_pod': EscapePod(),
'death': Death(),
'finished': Finished(),
}

def __init__(self, start_scene):
self.start_scene = start_scene

def next_scene(self, scene_name):
val = Map.scenes.get(scene_name)
return val

def opening_scene(self):
return self.next_scene(self.start_scene)


if __name__ == '__main__':
a_map = Map('central_corridor')
a_game = Engine(a_map)
a_game.play()

[jiangnanyanyu]

你可以打印 10 个字符的，那么长并没有啥用的字符串

[ifoolish]

请学会使用 IDE 的断点调试

[MarioLuisGarcia]

有一个网站叫 stackoverflow, 少年请开始你的冒险吧！