Steve Holden <st...@holdenweb.com> writes: > It isn't. Even inheritance itself isn't as useful as it at first > appears, and composition turns out in practice to be much more useful. > That goes double for multiple inheritance.
Composition /with a convenient notation for delegation/ works fairly well. Indeed, this can be seen as the basis of Self. But downwards delegation -- where a superclass leaves part of its behaviour unspecified and requires (concrete) subclasses to fill in the resulting blanks -- is hard to express like this without some kind of means of identifying the original recipient of the delegated message. Once you've done that, there isn't much of a difference between a superclass and a component with implicit delegation. -- [mdw] -- http://mail.python.org/mailman/listinfo/python-list
