# -*- coding:utf-8 -*-
#隐藏一个属性、不想让类的外部调用
#保护这个属性、不让这个属性随意被改变
#不想让子类继承

class Room:
    def __init__(self,name,length,width):
        self.name = name
        self.__length = length
        self.__width = width
    def area(self):
        return self.__length * self.__width
nezha = Room('哪吒',6,3)
print(nezha.area())
#-------------------------------------------------
class Room:
    def __init__(self,name,length,width):
        self.__name = name
        self.__length = length
        self.__width = width
    def get_name(self):
        return self.__name
    def set_name(self,newName):
        if type(newName) is str and newName.isdigit() == False:
            self.__name = newName
        else:
            print('不合法的姓名')
    def area(self):
        return self.__length * self.__width
nezha = Room('哪吒',6,3)
print(nezha.area())
nezha.set_name('123')
print(nezha.get_name())
#--------------------------------------------------
#父类的私有属性=不能被子类调用
class Foo:
    __key = '123'    #    _Foo__key

class Son(Foo):
    print(Foo.__key)  #子类不可以调用父类的私有属性     _Son__key
# AttributeError: type object 'Foo' has no attribute '_Son__key'