Steven D'Aprano wrote: > On Sun, 22 Jan 2006 18:29:45 +0100, Christoph Zwerschke wrote: >> For doing such things I would use a vector subtype of list. > > Not everything needs to be a separate class! Why create a magic class for > every piece of functionality you want? Just create functions that operate > on existing classes! > > What advantage is there to creating a "list with cartesian product" > subclass of list?
Principally, you're right (see also my example with iterators). But I can still see two reasons for classes: 1) That function would have to make a lot of case distinctions (check the types of operands). If you have a class, you already know the type of the operands (at least one). 2) It allows you to write a*b instead of mul(a,b) which looks nicer. -- Christoph -- http://mail.python.org/mailman/listinfo/python-list
