Python对象进行大小对比，重写gt、eq等方法

左手的ㄟ右手 2022-03-07 15:44 335阅读 0赞

本文介绍了重写重写\_\_gt\_\_、\_\_eq\_\_等对象内置方法。  
比较不同花色的扑克牌，按黑红梅方顺序从大到小比较，相同花色比较数值大小。

#!/usr/bin/env python
    # encoding: utf-8
    """
    @author: 
    @license: (C) Copyright 2013-2017, Node Supply Chain Manager Corporation Limited.
    @contact: 
    @software: pycharm
    @file: 8.8.py
    @time: 2019/2/16 12:23
    @desc:
    """
    
    flowers = ('♦', '♣', '♥', '♠')
    values = ('2', '3', '4', '5',
              '6', '7', '8', '9',
              '10', 'J', 'Q', 'K', 'A')
    
    
    class Card(object):
        def __init__(self, flower, value):
            self.flower = flower
            self.value = value
    
        def __gt__(self, other):
            if not isinstance(other, Card):
                raise TypeError('>运算对象是Card')
            if flowers.index(self.flower) > flowers.index(other.flower):
                return True
            elif flowers.index(self.flower) == flowers.index(other.flower) and \
                values.index(self.value) > values.index(other.value):
                return True
            else:
                return False
    
    
        def __eq__(self, other):
            if not isinstance(other, Card):
                raise TypeError('=运算要求目标是Card')
            if values.index(self.value) == values.index(other.value) and \
                    flowers.index(self.flower) == flowers.index(other.flower):
                return True
            else:
                return False
    
        def __ge__(self, other):
            if not isinstance(other, Card):
                raise TypeError('>=运算要求目标是Card')
            return self > other or self == other
    
        def __repr__(self):
            return '%s-%s' % (self.flower, self.value)
    
    
    if __name__ == "__main__":
        cd1 = Card(flower="♠", value="A")
        cd2 = Card(flower="♠", value="K")
        cd3 = Card(flower="♥", value="K")
        cd4 = Card(flower="♥", value="J")
        cd5 = Card(flower="♥", value="K")
        print(cd1 > cd2)  # True
        print(cd1 < cd2)  # False
        print(cd2 < cd3)  # False
        print(cd2 > cd3)  # True
        print(cd3 == cd5)  # True
        print(cd3 < cd5)  # False
        print(cd3 > cd5)  # False
        print(cd3 >= cd5)  # True
        print(cd3 <= cd5)  # True