Question

我很抱歉这个问题已被提出，并且多次回答。我已经检查了他们的大量问题，看到了确切的问题，并看到了他们的答案，但他们要么对我不起作用，要么是太简单的思维理解。这是我的代码;

from sys import exit
from random import randint

class Scene(object):

    def enter(self):
        print("Scene not configured")
        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)

class Death(Scene):

    quips = [
    "Your dead",
    "rekt",
    "super rekt"]

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

class Corridor(Scene):

    def enter(self):
        print("\nYou've a gun and stuff, what will you do? Shoot/Leg it")

        action = input("\n>> ")

        if action == "Shoot":
            print("\nYou killed someone, good stuff")
            print("You get into the armory.")
            return 'laser_weapon_armory'

        elif action == "Leg it":
            print("\nYou get shot before you get away.")
            return 'death'

        else:
            print("\nThat was not an option")
            return 'central_corridor'

class LaserWeaponArmory(Scene):

    def enter(Self):
        print("\nRight, you're in the armory.")
        print("There's a lock on the next door. \nEnter 3 digits to unlock")
        code = "%d%d%d" % (randint(1,9), randint(1,9), randint(1,9))
        guess = input("\n >> ")
        guesses = 0

        while guess != code and guesses < 10:
            print("\nDENIED")
            guesses += 1
            guess = input("\n >> ")

        if guess == code:
            print("\nDoor opens.")
            print("You enter the bridge.")
            return 'the_bridge'

        else:
            print("\nDoor remains locked. You get killed")
            Death()

class TheBridge(Scene):

    def enter(Self):
        print("\nYou're in the bridge.")
        print("There's a bomb. What do you do?")
        print("Defuse/Run away")

        action = input("\n >> ")

        if action == 'Defuse':
            print("\nYou failed, bomb goes off")
            return 'death'

        elif action == 'Run away':
            print("\nYou get in the escape pod bay.")
            return 'escape_pod'

        else:
            print("\nThat was not an option.")
            Death()

class EscapePod(Scene):

    def enter(self):
        print("\nThere's 5 pods, which do you take?")

        good_pod = randint(1.5)
        pod = input("\n>>Pod #")

        if int(pod) != good_pod:
            print("\nThis pod is fucked.")
            Death()

        else:
            print("\nYurt, the pod works. You're out of here kid.")
            return 'finished'

class Finished(Scene):

    def enter(self):
        print("\nGame over. Go away.")
        return 'finished'

class Map(object):

    scenes = {
    'central_corridor': Corridor(),
    'laser_weapon_armory': LaserWeaponArmory(),
    'the_bridge': TheBridge(),
    'escape_pod': EscapePod(),
    'finished': Finished(),
    }

    def __init__(self, start_scene):
        self.start_scene = start_scene
        print("start_scene in __init__", self.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_corridor')
    a_game = Engine(a_map)
    a_game.play()

错误;

Traceback (most recent call last):
  File "C:\Python\Shtuff\game.py", line 143, in <module>
    a_game.play()
  File "C:\Python\Shtuff\game.py", line 20, in play
    next_scene_name = current_scene.enter()
AttributeError: 'NoneType' object has no attribute 'enter'

我是Python的新手，主要是了解类和所有这些。据我所知，这与LPTHW中的代码完全一样。我在代码中遇到的这个问题的两个答案，所以无法看到我出错的地方。这可能与我使用Python3和LPTHW所有关于Python 2.XX的事情有关吗？

Answer 1

对于不存在的键，字典的None方法返回a = {'hello': 'world'} print(a.get('hello')) # -> world print(a.get('test')) # -> None：

enter

您假设每个场景的'death'方法都返回下一个场景的名称。其中一些方法返回Corridor（例如，请参阅TheBridge和Map.scenes）。然后，此返回值将用作'death'的键。但是那里没有None键，所以它返回self。

顺便说一下，Self和INSERT INTO..NOWAIT是完全不同的，但是你同时使用它们并期望它们做同样的事情。

ex43学习Python的难点

1 个答案: