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Newbie inheritance problem

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Hi all, I have overwridden the __add__ method for a class, then builta class based on the above class; however, the object I'm returning isof the base class not the inherited class. If that doesn't make sensesee below:class A:    def __init__(self,value=0.0)        self._value=float(value)    def __add__(self,other)        return A(self._value+other._value)class B(A):    passx=B(3)y=B(2)z=x+yThe way I've done it z becomes an instance of A not B!!! How do I doit correctly? Do I have to override all the __add__, __sub__, etc...methods?

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