Refactoring similar subclasses

[Bruno Desthuilliers]

Steven D'Aprano a écrit :
> I have some code that currently takes four different classes, A, B, C and 
> D, and subclasses each of them in the same way:
> 
> class MyA(A):
>     def method(self, x):
>         result = super(MyA, self).method(x)
>         if result == "spam":
>             return "spam spam spam"
>         return result
>     # many more methods overloaded
> 
> 
> class MyB(B):
>     def method(self, x):
>         result = super(MyB, self).method(x)
>         if result == "spam":
>             return "spam spam spam"
>         return result
>     # many more methods overloaded
> 

If that's really what your code is doing - I mean, calling the super() 
implementation, checking the result and eventually returning something 
else instead - then a simple decorator might be enough... Could even be 
"applied" by the metaclass.