Python 3.3类方法不起作用，为什么？

Question

你好，下面是我问题相关的代码：

    class Player:
        def __init__(self, name, x, y, isEvil):
            self.health = 50
            self.attack = randint(1, 5)
            self.name = name
            self.x = x
            self.y = y
            self.isEvil = isEvil

        def checkIsAlive(self):
            if self.health <= 0:
            return False
        else:
            return True

    # implicit in heritance. if the child doesn't have a function that the parent has
    # the functions of the parent can be called as if it were being called on the
    # parent itself

    class Enemy(Player):


        #def __init__(self, name, x, y, isEvil):
        # self.health = 50
        # self.name = name
        # self.x = x
        # self.y = y
        pass

还有一些更多的代码：

    e = Enemy('Goblin', 10, 11, True)

    p = Player('Timmeh', 0, 1, False)
    isLight()

    while True:
        if p.checkIsAlive() == True and e.checkIsALive() == True:
            fight()

        else:
            if p.checkIsAlive() == True:
                print('%s is victorious!!! %s survived with %s health points.' % (p.name, p.name, p.health))
            else:
                print('%s shrieks in its bloodlust!!! %s has %s health points' % (e.name, e.name, e.health))

但是当我尝试运行这个代码时，我遇到了以下错误：

    Traceback (most recent call last):
    File "<string>", line 420, in run_nodebug
    File "C:\Python33\practice programs\textstrat\classees.py", line 94, in <module>
    if p.checkIsAlive() == True and e.checkIsALive() == True:
    AttributeError: 'Player' object has no attribute 'checkIsAlive'

不过在使用交互式控制台时，我可以这样做：

    if p.checkIsAlive() == True and e.checkIsAlive() == True:
    ...     print('they are')
    ...     
    they are

我想做的就是调用checkIsAlive的布尔值，以确定这两个对象是否会打斗。在其他方面它都能正常工作，我本来可以直接用： if p.health <= 0 or e.health <= 0: 但这样的话，我的checkIsAlive()方法就没什么用处了，因为我还想尽可能重复使用代码。我真的搞不懂为什么会这样，希望能理解这个问题。提前感谢你的帮助。

错误处理代码重用布尔值类方法方法调用对象交互式控制台健康检查

Python 3.3类方法不起作用，为什么？

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