Python高级——类的知识

一、知识梳理：

二、货币场景搭建：

1）代码展示：

class RMB:count = 0def __init__(self,yuan=0,jiao=0,fen=0):self.__yuan = yuanself.__jiao = jiaoself.__fen = fenRMB.count += 1def __add__(self, other):temp = RMB()temp.__yuan = self.__yuan + other.__yuantemp.__jiao = self.__jiao + other.__jiaotemp.__fen = self.__fen + other.__fenreturn tempdef __sub__(self, other):temp = RMB()temp.__yuan = self.__yuan - other.__yuantemp.__jiao = self.__jiao - other.__jiaotemp.__fen = self.__fen - other.__fenreturn tempdef __gt__(self, other):if self.__yuan > other.__yuan:return Trueelif (self.__yuan == other.__yuan) and self.__jiao > other.__jiao:return Trueelif ((self.__yuan == other.__yuan) and (self.__jiao == other.__jiao)) and self.__fen > other.__fen:return Trueelse:return Falsedef __isub__(self, other=0):self.__yuan -= 1self.__jiao -= 1self.__fen -= 1def __iadd__(self, other=0):self.__yuan += 1self.__jiao += 1self.__fen += 1def __del__(self):RMB.count -= 1def __str__(self):return f"{self.__yuan}元{self.__jiao}角{self.__fen}分,count={RMB.count}"if __name__ == '__main__':x = RMB(5,5,5)print(f"x={x}")y = RMB(3,3,3)print(f"y={y}")z = x + yprint(f"x+y={z}")w = x - yprint(f"x-y={w}")print(f"x > y的结果是{x > y}")x.__isub__()print(f"x自减之后,x={x}")y.__iadd__()print(f"y自增之后,y={y}")

 2）结果展示：

x=5元5角5分,count=1
y=3元3角3分,count=2
x+y=8元8角8分,count=3
x-y=2元2角2分,count=3
x > y的结果是True
x自减之后,x=4元4角4分,count=3
y自增之后,y=4元4角4分,count=3