David Isaac a écrit : > Bruno wrote: > >>This is usually known as a 'factory method'. You do realise that both > > solutions are *not* strictky equilavent, do you? > > Your point I believe is that after inheritance the factory method > in the subclass will still > return MyClass() > but will return an instance of the subclass if I > return self.__class__() > > Right.
Right. > You did not comment further so I take it your view is that > each is fine, pick the one that gives the behavior you want. I did not comment because I don't know which behaviour is appropriate in *your* case. > But Steve suggests going with the latter. That's what I'd do too a priori. > Here is an (very crude) argument for going with the latter: > if you know you want an instance of MyClass(), > you can do that directly, Sure, but that's another point. If you want an instance of a subclass of MyClass, you can also do that directly !-) MVHO is that in most cases, one would expect such a factory method to play nicely with subclassing. But as I said, this is not a hard rule. -- http://mail.python.org/mailman/listinfo/python-list
