Class inheritance and method overloading examples

1. Class inheritance and method overloading

The above is to first define a class A, and then define a class B. B inherits class A, so that B has the non-private properties and methods of A.

 1 class Washer: 2     company='ZBL' 3     def __init__(self,water=10,scour=2): 4         self._water=water #不想让用户直接访问实例变量，可以标志成私有 5         self.scour=scour 6         self.year=2000#这是生产日期 7         #属性包装，将water属性包装成方法，用户使用water时实际是访问的方法 8     @staticmethod #定义一个静态方法 9     def spins_ml(spins):10         return spins*0.411         print('company:',Washer.company)12         #print('year:',self.year)#错误，静态方法不能使用实例属性13     @classmethod14     def get_washer(cls,water,scour):#cls相当于实例方法中的self，调用是不用提供这个参数15         return cls(water,cls.spins_ml(scour))#cls代表类名Washer,故不是硬编码（改类名是不用改cls，若cls用类名代替也对，但若改类名这个地方也需要改动）16     17     @property18     def water1(self):#如果用户使用 实例.water相当于访问这个方法，而不是真的访问属性19         return self._water20     21     @water1.setter22     def water1(self,water):23         if 0<water<=500:24             self._water=water25         else:26             print('set Failure！')27     @property28     def total_year(self):29         return 2017-self.year30     31     def set_water(self,water):32         self.water=water        
33 34     def set_scour(self,scour):35         self.scour=scour        
36 37     def add_water(self):38         print('Add water:',self._water)39 40     def add_scour(self):41         print('Add scour:',self.scour)42 43     def start_wash(self):44         self.add_water()45         self.add_scour()46         print('Start wash...')47         48 class WasherDry(Washer):# 建立一个新类，继承自Washer49     def dry(self):#新类中可以定义只属于子类的新方法50         print('Dry cloths...')51     def start_wash(self):#在子类中新定义与父类同名的方法就是方法的重载52         self.add_scour()53         self.add_water()54         55 if __name__=='__main__':56 ##    print(Washer.spins_ml (8))57 ##    w=Washer()58 ##    print(w.spins_ml(8))59 ##    w=Washer(200,Washer.spins_ml(8))60 ##    w.start_wash()61     w=WasherDry()62     w.start_wash()63     print(w.scour,w.company)64     w.dry()

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