属性错误Blackjack Python（固定）

Question

我必须从我的课本修改这个程序来使用下注，但我甚至不能让原来的程序运行。这是该书中出现的程序，除了每个课程在不同的页面上。我不确定是否需要输入所有这些课程，因为我的教授说要拿二十一点计划并修改它来接受投注，但是它会导入甲板和卡片，所以我不确定。我将它们输入以防万一，因为我认为它不会造成太大的伤害，也许我错了。

class Card(object): 

    RANKS=(1,2,3,4,5,6,7,8,9,10,11,12,13) 
    SUITS=('Spades','Diamonds','Hearts','Clubs') 

    def _init_(self,rank,suit): 
    self.rank=rank 
    self.suit=suit 

    def _str_(self): 
    if self.rank==1: 
     rank='Ace' 
    elif self.rank==11: 
     rank='Jack' 
    elif self.rank==12: 
     rank='Queen' 
    elif self.rank==13: 
     rank='King' 
    else: 
     rank=self.rank 
    return str(rank)+ ' of ' + self.suit 

import random 

class Deck(Card,object): 

    def _init_(self): 
    self._cards=[] 
    for suit in Card.SUITS: 
     for rank in Card.RANKS: 
      c=Card(rank,suit) 
      self._cards.append(c) 

    def shuffle(self): 
    random.shuffle(self._cards) 

    def deal(self): 
    if len(self)==0: 
     return None 
    else: 
     return self._cards.pop(0) 

    def _len_(self): 
    return len(self._cards) 

    def _str_(self): 
    result='' 
    for c in self._cards: 
     result= result+str(c)+'\n' 
    return result 

class Player(Deck,object): 

    def _init_(self, cards): 
    self._cards= cards 

    def _str_(self): 
    result=",".join(map(str,self._cards)) 
    results += "\n " + str(self.getPoints()) + " points" 
    return result 

    def hit(self,card): 
    self._cards.append(card) 

    def getPoints(self): 
    count=0 
    for card in self._cards: 
     if card.rank>9: 
      count+=10 
     elif card.rank==1: 
      count+=11 
     else: 
      count+=card.rank 
    for card in self._cards: 
     if count <=21: 
      break 
     elif card.rank==1: 
      count -= 10 
    return count 

    def hasBlackjack(self): 
    return len(self._cards)==2 and self.getpoints()==21 

class Dealer(Player,object): 

    def _init_(self,cards): 
    Player._init_(self,cards) 
    self._showOneCard= True 

    def _str_(self): 
    if self._showOneCard: 
     return str(self._cards[0]) 
    else: 
     return Player._str_(self) 

    def hit(self,deck): 
    self._showOneCard= False 
    while self.getPoints() <17: 
     self.Cards.append(deck.deal()) 

class Blackjack(Player, object): 

    def _init_(self): 
    self._deck = Deck() 
    self._deck.shuffle() 

    self._player = Player([self._deck.deal(), 
          self._deck.deal()]) 
    self._dealer = Dealer([self._deck.deal(), 
          self._deck.deal()]) 

    def play(self): 
    print ("Player:\n", self._player) 
    print ("Dealer:\n", self._dealer) 
    while True: 
     choice = input("Do you want to hit? [y/n]: ") 
     if choice in ("Y","y"): 
      self._player.hit(self._deck.deal()) 
      points = self._player.getPoints() 
      print ("Player:\n", self._player) 
      if points >= 21: 
       break 
     else: 
      break 
    playerPoints = self._player.getPoints() 
    if playerPoints> 21: 
     print ("You bust and lose") 
    else: 
     self._dealer.hit(self._deck) 
     print ("Dealer:\n", self._dealer) 
     dealerPoints=self._dealer.getpoints() 
     if dealerPoints >21: 
      print ("Dealer busts you win") 
     elif dealerPoints>playerPoints: 
      print ("Dealer wins") 
     elif dealerPoints<playerPoints and playerPoints <= 21: 
      print ("You win") 
     elif dealerPoints == playerPoints: 
      if self._player.hasBlackjack() and not self._dealer.hasBlackjack(): 
       print ("You win") 
     elif not self._player.hasBlackjack() and self._dealer.hasBlackjack(): 
      print ("Dealer wins") 
     else: 
      print ("There is a tie") 

Blackjack().play() 

我得到

Traceback (most recent call last): 
File "C:\Users\Schuler\bj.py", line 151, in <module> 
Blackjack().play() 
File "C:\Users\Schuler\bj.py", line 117, in play 
print ("Player:\n", self._player) 
AttributeError: 'Blackjack' object has no attribute '_player' 

我直接复制一切从书中，我无法弄清楚什么是错的。

_____ 编辑 _____

因此有人指出，我忘了双下划线，所以我固定的。然后，我跑了10次，发现它现在运行的小拼写错误。

Answer 1

它看起来像你遗漏了你的一些方法定义的双下划线。它是__init__，而不是_init_。 __str__，__len__以及其他特殊类方法也是如此。

这些特殊的方法名称必须准确写入否则它们将不起作用。例如，如果您有一个名为__init__的方法，那么当您实例化该类型的对象时，该方法中的代码将自动运行。由于您输入的方式错误，该方法从未运行且您的代码发生了错误。

如何__init__作品的一个简单的例子：

class Player(object): 
    def __init__(self): 
     print 'new player object' 

Player() # __init__() called automatically and prints 'new player object'