Function Overloading and Python

Stefan Behnel stefan_ml at behnel.de
Mon Feb 25 08:46:13 CET 2008


Stefan Behnel wrote:
> Allen Peloquin wrote:
>> class B
>> {
>>     fun(A x, A y, A z)...
>>     fun(A1 x, A y, A z)...
>> }
>>
>> class B1
>> {
>>     fun(A1 x, A y, A z)...
>> }
>>
>> Such that any previous behavior is inherited, but behaves
>> polymorphically because of the single function name.
> 
> Try something like this:
> 
> class B(object):
>     def fun(x,y,z):
>         if isinstance(x, A1):
>             return self._fun(x,y,z)
>         # ...
> 
>     def _fun(x,y,z):
>         # ...
> 
> class B1(B):
>     def _fun(x,y,z):
>         # ...

Oh, well, make that:

 class B(object):
     def fun(self, x,y,z):
         if isinstance(x, A1):
             return self._fun(x,y,z)
         # ...

     def _fun(self, x,y,z):
         # ...

 class B1(B):
     def _fun(self, x,y,z):
         # ...


(but you already knew that anyway, didn't you?)

Stefan



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