Maric Michaud a écrit : > Le vendredi 08 septembre 2006 10:15, Bruno Desthuilliers a écrit : > >>You >>mentioned NotImplementedError, which is indeed the usual way to make >>something "abstract" in Python. > > > Hummm, some more thoughts about this. > > I can imagine class hierarchies where the presence of not implemented methods > doesn't mean that the class is actually an abstract one.
I can imagine this too - as well as I can imagine the nightmarish spaghetti code that could use this class hierarchie. > Even if partial > implementation is not a common scheme it can save you from writing a lot of > classes. A partial implementation should return default values, not raise (aka NullObjectPattern). Well, IMHO at least. (snip) > And this can become a true spider net for more complicated cases. Obviously, > in practice we will choose alternatives to inheritance (strategies, > visitors, ...) Composition/delegation... > to work with such complex situations, Indeed. -- http://mail.python.org/mailman/listinfo/python-list
