python class 找不到自己的属性

Question

我尝试创建类来表示一副纸牌。问题是 showDeck 方法没有找到卡片列表并打印出来：

Traceback (most recent call last):
  File "C:\Users\User\workspace\learn\cards\Deck.py", line 32, in <module>
    newDeck.showDeck()
  File "C:\Users\User\workspace\learn\cards\Deck.py", line 27, in showDeck
    for item in self.cards ():
AttributeError: 'Deck' object has no attribute 'cards'

代码如下：

class Card:
    def __init__(self,sign,number):
        self.number=number  
        self.sign=sign
   #constructor of card class

    def show (self):
        print ("["+str(self.sign)+","+str(self.number)+"]")
    #prints out the card  

class Deck:
    def _init_ (self):
       self.cards=[]
       for i in range (1,4):
           sign=i
           for i in range (1,14):
               number=i
               a=Card(sign,number)
               a.show()
               self.cards.append(a)
     #the constructor of the deck, creates a list, and then creats all the possible cards and adds them to the list          

    def showDeck (self):
        for item in self.cards ():
            item.show
    #prints out the deck

newDeck= Deck()

newDeck.showDeck()

Answer 1

您拼错了 Deck.__init__ 方法：

class Deck:
    def _init_ (self):

开始和结束需要两个下划线。您的 _init_ 方法永远不会被调用，所以 self.cards 永远不会被设置。

你对 Card class 是正确的；请注意 init?

两边的下划线数量是如何加倍的

class Card:
    def __init__(self,sign,number):

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