Python属性继承

我是python的新手,我不确定我在做什么是正确的.
我有一个基类A和一个继承的类B.

class A(object):

    def __init__(self,name):
        self.__name = name

    @property
    def name(self):
        return self.__name

    @name.setter
    def name(self,name):
        self.__name = name

class B(A):
    def __init__(self,name):
        super(NominalValue,self).__init__(name)

    @property
    def name2(self):
        return self.__name2

    @name2.setter
    def name2(self,n):
        self.__name2 = n

    def toString():
        print self.__name + self.__name2

if __name__ == "__main__":
    instance = B('name');
    instance.toString()

当我运行它时,它抱怨B类没有任何属性__name.

AttributeError: 'B' object has no attribute '_B__name'

我显然没有正确地进行继承.如何处理要正确继承的属性并避免在继承的类中重复属性？