weixin_44655378
weixin_44655378
采纳率25%
2019-04-05 01:54

笨方法学python3上的习题43AttributeError: 'NoneType' object has no attribute 'enter',哪错了

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 pround...if she were smarter.",
"such a luser.",
"I have a small puppy that's better st this.",
"You're worse than your Dad's jokes.",
]

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 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 runing 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
    zbout 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 repeattedly in the face until you are
            dead. Then he eats you.
            """))
        return 'death'
    elif action == "dodge!":
        print(dedent("""
            Lke 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 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 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("""
        Youd 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 off
        the room and find the neutron bomb in its container.
        There's a keypad lock on 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 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(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 eith the entron destruct bomb
        under your arm and surprise 5 Gonthons who are trying to 
        take control of the ship. Each of them has an even uglier
        clown sostume than last.They have'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("""
            In a panic you throw the bomb at 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(dedent(""""
            You point your blaster at the bomb under your arm and
            the Gothons put their hands up adn 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 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 EscapePod(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 you 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 5pods, 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 the eject button.
            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(dedent("""
            You jump into pod {guess} and hit the eject button.
            The pod easily slides out into space heading to
            the plantes below. As it flies 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('central_corrider')
a_game = Engine(a_map)
a_game.play()

返回结果:
Traceback (most recent call last):
File "F:/Python/test43.py", line 228, in
a_game.play()
File "F:/Python/test43.py", line 18, in play
next_scene_name = current_scene.enter()
AttributeError: 'NoneType' object has no attribute 'enter'

Process finished with exit code 1
看了好久,就是找不到是哪里错了,很烦

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2条回答

  • weixin_43925799 weixin_43925799 2年前

    while current_scene != last_scene:
    next_scene_name = current_scene.enter()
    current_scene = self.scene_map.next_scene(next_scene_name)
    这段代码改为:
    while current_scene != last_scene:
    current_scene = self.scene_map.next_scene(current_scene.enter())
    这样就可以了,我遇到同样的问题三这样解决的

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  • weixin_45123141 定而后能静 2年前

    return 'the bridge' 少了一个下划线

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