class A(object):
    def __init__(self):
        self.__value = 1

    def getvalue(self):
        return self.__value

class B(A):
    def __init__(self):
        super(B, self).__init__()
        self.__value = 2

    def getvalue_cur(self):
        return self.__value

b = B()
print(b.getvalue())
print(b.getvalue_cur())
print(b.__value)

class A(object):
    def __init__(self):
        self.__value__ = 1

    def getvalue(self):
        return self.__value__

class B(A):
    def __init__(self):
        super(B, self).__init__()
        self.__value__ = 2

    def getvalue_cur(self):
        return self.__value__

b = B()
print(b.getvalue())
print(b.getvalue_cur())
print(b.__value)