A generic question: idiom for a paramterized base class?

[Samuele Pedroni]

> ############ example.py ###########
> class GenericBase(object):
>     def __iadd__(self,other):
>         return TAdd(self,other) # Problem!!

return self.__class__(self,other)


>     def __add__(self,r):
>         return GenericBase.__iadd__(self,r)
>     def __radd__(self,l):
>         return GenericBase.__iadd__(l,self)
>