Python物件導向編程——一些類定義（雜）

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一、abstractmethod

• 子類必須全部實現重寫父類的abstractmethod方法
• 非abstractmethod方法可以不實現重寫
• 帶abstractmethod方法的類不能執行個體化

  from abc import abstractmethod, ABCMeta

 1 class BettingStrategy(metaclass=ABCMeta): 2  3     @abstractmethod 4     def bet(self): 5         print(‘0‘) 6  7     def record_win(self): 8         print(‘win‘) 9 10     def record_loss(self):11         print(‘loss‘)12 13 14 class Bet(BettingStrategy):15     def bet(self):16         print(‘1‘)

 

擴充：abc模組

 

二、staticmethod：靜態函數

對象不用執行個體化即可調用的函數

 1 class Hand4: 2     def __init__(self, dealer_card, *cards): 3         self.dealer_card = dealer_card 4         self.cards = cards 5  6     @staticmethod 7     def freeze(other): 8         hand = Hand4(other.dealer_card, *other.cards) 9         return hand10 11     @staticmethod12     def split(other, card0, card1):13         hand0 = Hand4(other.dealer_card, other.cards[0], card0)14         hand1 = Hand4(other.dealer_card, other.cards[1], card1)15         return hand0, hand116 17     def __str__(self):18         return ‘,‘.join(map(str, self.cards))

 

 

1 h41 = Hand4(deck3.pop(), deck3.pop(), deck3.pop())2     s1, s2 = Hand4.split(h41, deck3.pop(), deck3.pop())3     s3 = Hand4.freeze(h41)

調用

 

Python物件導向編程——一些類定義（雜）