尝试从类继承时出现错误：“x 实例没有属性 y”

我无法真正理解我做错了什么，因为当我在“小规模”中尝试它并且它在那里工作时。

我有一个名为Play()

我是这样的：

class Play():
    def __init__(self):
        file = open("/home/trufa/Desktop/test", "r")
        self.word = random.choice(file.readlines()).rstrip()
        self.errAllowed = 7
        self.errMade = 0
        self.errList = []
        self.cheatsAllowed = 2##chetas not incrementing
        self.cheatsMade =0
        self.wordList = ["*"]*len(self.word) ##this one is the one I want to have available in another class

...

然后我还有另一个课程叫Score()

class Score(Play):
    def __init__(self):
        self.initialScore = 0

    def letterGuess(self):
        self.initialScore += 1
        return self.errList

...

我实例化了两者：

game = Play()
points = Score()

如果我这样做：

print points.letterGuess()

它给了我一个错误：

Traceback (most recent call last):
  File "/home/trufa/workspace/hangpy/src/v2.py", line 188, in <module>
    startGame()
  File "/home/trufa/workspace/hangpy/src/v2.py", line 134, in startGame
    print points.letterGuess()
  File "/home/trufa/workspace/hangpy/src/v2.py", line 79, in letterGuess
    return self.errList
AttributeError: Score instance has no attribute 'errList'

我不明白为什么，因为我可以毫无困难地做到这一点：

class One():
    def __init__(self):
        self.list= [1,2]

class Two(One):
    def meth(self):
        return self.list

uan = One()
tu = Two()

print uan.list 
print tu.meth() ## Both output [1,2]

我对 OOP 很陌生，所以我可能会犯各种愚蠢的错误，但我不知道在哪里！

I think我已经发布了所有相关代码，但我认为错误可能在其他地方，我可以提供。

^{As I said I'm very new, so this might have nothing to do with inheritance I just think it called that when you get "something" from within another class (you must be shouting at the screen by now)}

你覆盖原来的__init__，然后它就不会被调用，也不会初始化成员。你必须打电话给父母__init__单独地，通常使用以下片段：

def __init__(self):
    super(Score, self).__init__()

See the 文档用于super() http://docs.python.org/library/functions.html#super了解详情。然而，super()仅适用于所谓的新式课程。因此，您必须更改以下定义Play继承自object:

class Play(object)

或者直接调用父级的方法：

def __init__(self):
    Play.__init__(self)