Adding two Objects in Python 3

I am defining a class, and one of the methods I want is to return the SUM of two objects which hold int values. My code currently reads -

def get_total(self):
    return self.__num1 + self.__num2

The error I get -

    return self.__num1 + self.__num2
TypeError: unsupported operand type(s) for +: 'Num' and 'Num'


If anyone can help me out I'd appreciate it.

>>6
Problem?