了解 Python Hard Way ex 43 循环问题

Question

我目前正在通过学习 Python 艰难的方式进行这项练习，并且正在努力解决一些问题。每当我到达 LaserWeaponArmory(scene)我的部分代码，它会在执行实际死亡场景之前循环两次。基本上允许我 20 次尝试猜测门密码，而不是仅仅 10 次。它将在接下来的 10 次尝试之前循环回到场景的开始。之后会正常退出。

对象和类对我来说开始变得更有意义，但我目前只是在寻找解决此问题的方向的一些指示。我将不胜感激任何人提供的任何建议！

我在下面提供了我认为与我的问题相关的代码，但我仍然是一个菜鸟，所以如果您需要查看更多内容来回答我的问题，请告诉我！

class Scene(object):

    def enter(self):
         print "This scene is not yet configured. 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 kind 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."
    ]

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

class LaserWeaponArmory(Scene):

    def enter(self):
        print "You do a dive roll into the Weapon Armory, crouch and scan the room"
        print "for more Gothons that might be hiding. It's dead quiet, too quiet."
        print "You stand up and run to the far side of the room and find the"
        print "neutron bomb and it's container. There's a keypad lock on the box"
        print "and you need the code to get the bomb out. If you get the code"
        print "wrong 10 times then lock closes forever and you can't"
        print "get the bomb. The code is 3 digits."
        code = "%d%d%d" % (randint(1, 9), randint(1,9), randint(1,9))
        guesses = 0
        attempt = 1
        print "Attempt number %s." % attempt
        guess = raw_input("[keypad]> ")


        while guess != code and guesses != 9:
            print "BZZZZZZEDDD!"
            guesses += 1
            attempt += 1
            print "Attempt number %s." % attempt
            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'
        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'

Answer 1

在你的 Engine 循环中你 enter 每个场景两次。第一次是最后一行：

current_scene.enter()

第二次是重新进入循环的时候：

next_scene_name = current_scene.enter()

我认为最后一行应该在 while 循环之外。只是取消缩进:)

了解 Python Hard Way ex 43 循环问题

Learn Python the Hard Way ex 43 looping issue

python

class

object

while-loop