[英]calling one class's method inside another in python
我该如何调用属于Deck类的shuffle和takecard方法,并在Dealer类中调用它而不继承整个类。
#!/usr/bin/python
import random
class Card:
"""A card object with a suit and rank."""
RANKS = (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
SUITS = ('Spades', 'Diamonds', 'Hearts', 'Clubs')
def __init__(self, rank, suit):
self._rank = rank
self._suit = suit
def getRank(self):
return self._rank
def getSuit(self):
return self._suit
def __str__(self):
translate = {11:'Jack', 12:'Queen', 13:'King', 14: 'Ace'}
r = self._rank
if r in [11, 12, 13, 14]:
myrank = translate[r]
else:
myrank = str(r)
return myrank + " of " + self._suit
def __lt__(self, other):
return( self._rank < other.getRank() )
class Deck:
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 takecard(self):
if len(self._cards) == 0:
return None
else:
#print self._cards.pop()
return self._cards.pop()
def __len__(self):
return len(self._cards)
def __str__(self):
result = ""
for c in self._cards:
result = result + str(c) + '\n'
return result
class Dealer(object):
def __init__(self, name):
self.name = name
def shuffle(self):
deck=self.deck
self.deck.shuffle()
def deal(self):
self.deck.takecard()
如果我这样声明self.deck.takecard和self.deck.shuffle不会返回Deck方法: Dealer('Bob',Deck)
如果要在创建Dealer的实例时传递Deck的实例,将平台作为属性附加到经销商,然后从经销商的功能中调用平台的功能,则可以执行以下操作:
class Dealer(object):
def __init__(self, name, deck):
self.name = name
self.deck = deck
def shuffle(self):
self.deck.shuffle()
def deal(self):
return self.deck.takecard()
您作为参数'deck'传入的对象必须是Deck的一个实例:
a_deck = Deck()
我相信您的代码存在的问题是您需要从Dealer函数返回,而不仅仅是从Deck的函数返回,如下所示。 您还需要在初始化程序中设置平台:
class Dealer(object):
def __init__(self, name, deck):
self.name = name
self.deck = deck
def shuffle(self):
deck=self.deck
return self.deck.shuffle()
def deal(self):
return self.deck.takecard()
最后,您应该使用以下命令初始化此类:
my_dealer = Dealer("Bob", Deck())
仅使用不带括号的Deck会导致将类提供给经销商,而不是您想要的类实例。
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