如何在 Python 2 中定义一个类？

Question

我刚刚开始学习 Python 中的类和对象，我在网上查找了为什么会出现错误的答案：“nameError, 'Bedroom' is not defined”并且有很多答案和解释，因为我必须定义类，但我只是看不出我个人做错了什么，这让我发疯，我知道这可能是一个非常愚蠢的错误，但我想你可以从中学习。

prompt = "> "

class Start():
    print "Project Storm v0.01"
    print "Press Enter to Play"
    raw_input(prompt)
    bedroom = Bedroom(Room)

class Room():
    def enter(self):
        pass

class Bedroom(Room):
    def enter(self):
        print "You wake up dazed and confused with no memory of how you got here."
        print "You find yourself in a dark bedroom with a closed door and a small lamp on the side."

Answer 1

试试这个：

class Room():
    def enter(self):
        pass

class Bedroom(Room):
    def enter(self):
        print "You wake up dazed and confused with no memory of how you got here."
        print "You find yourself in a dark bedroom with a closed door and a small lamp on the side."

class Start(): # shouldn't this be Game() or something?
    print "Project Storm v0.01"
    print "Press Enter to Play"
    raw_input(prompt)
    bedroom = Bedroom(Room)
    # Bedroom has now been defined, so it knows what that is.

不过，这是一种奇怪的结构。给我一点时间，我可以想出一些更可扩展的东西....

PROMPT = "> "

class Room():
    def __init__(self, msg):
        self.msg = msg
    def enter(self):
        print msg

class Bedroom(Room):
    pass
    # there's not actually anything special about this now, since all Room objects
    # will have a message. Maybe you have something special here?

class Game():
    def __init__(self):
        print "Project Storm v0.01"
        print "Press Enter to Play"
        raw_input(PROMPT) # all caps for constants
        self.rooms = {}
        self.rooms["bedroom"] = Bedroom("""You wake up dazed and confused with no memory of how you got here.
You find yourself in a dark bedroom with a closed door and a small lamp on the side.""")
    def start(self):
        self.rooms['bedroom'].enter()

if __name__ == "__main__":
    game = Game()
    game.start()

现在您可以更轻松地添加带有自己描述的房间并适当地调整游戏节奏。