Python Object-Class 4 inheritance and method overloading

1. Inheritance of classes and overloading of methods

The above is defined by a Class A, and then by the definition of a class B,b inherits the Class A, so that B has a non-private properties and methods.

1 classWasher:2company='ZBL'3def __init__ (self,water=Ten, scour=2):4Self._water=water #不想让用户直接访问实例变量, can be marked as private5Self.scour=Scour6Self.year= -#这是生产日期7 #属性包装, wraps the water property into a method that is actually accessed when the user uses water8 @staticmethod #定义一个静态方法9 def spins_ml (spins):Ten         returnspins*0.4 OnePrint'Company :', Washer.company) A#print ('Year :', Self.year) #错误, static methods cannot use instance properties - @classmethod - def get_washer (cls,water,scour): #cls相当于实例方法中的self, call is not provided with this parameter the         returnCLS (WATER,CLS.SPINS_ML (Scour)) #cls代表类名Washer, it is not hard-coded (the class name is not changed to CLS, if the CLS is replaced by the class name is also the same, but if the name of the change in this place also needs to change) -      - @property - def water1 (self): #如果用户使用 instance. Water is equivalent to accessing this method instead of actually accessing the property +         returnSelf._water -      + @water1. Setter A def water1 (self,water): at         if 0<water<= -: -Self._water=Water -         Else: -Print'Set failure! ') - @property - def total_year (self): in         return  .-Self.year -      to def set_water (self,water): +Self.water=Water -  the def set_scour (self,scour): *Self.scour=Scour $ Panax Notoginseng def add_water (self): -Print'Add Water:', Self._water) the  + def add_scour (self): APrint'Add Scour:', Self.scour) the  + def start_wash (self): - Self.add_water () $ Self.add_scour () $Print'Start Wash ...') -          - classWasherdry (Washer): # Create a new class that inherits from washer the def Dry (self): #新类中可以定义只属于子类的新方法 -Print'Dry cloths ...')Wuyi 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 the Self.add_scour () - Self.add_water () Wu          - if__name__=='__main__': About# # Print (WASHER.SPINS_ML (8)) $# # W=Washer () -# # Print (W.SPINS_ML (8)) -# # W=washer ( $, WASHER.SPINS_ML (8)) - # # W.start_wash () Aw=Washerdry () + W.start_wash () the print (W.scour,w.company) -W.dry ()

Python Object-Class 4 inheritance and method overloading