Raymond Hettinger <pyt...@rcn.com> writes: > I'm writing-up more guidance on how to use super() and would like to > point at some real-world Python examples of cooperative multiple > inheritance.
I'd mention the SocketServer library, except I'm not sure what you mean by "cooperative", so I don't know if that counts. The few times I've tried to use multiple inheritance, I think it wasn't the right idea for what I was doing. It turns into a big mess quite easily. The classic example though is a window system, where you have a "window" class, and a "scroll bar" class, and a "drop-down menu" class, etc. and if you want a window with a scroll bar and a drop-down menu, you inherit from all three of those classes. They each have to support (e.g.) a "redraw" operation, so automatic method combination figures out what to call. I''ve mostly seen this stuff in connection with Lisp. If you look at a CLOS manual you can probably find examples. There are also some examples in the old CADR manual, using the MIT Flavors system which predated CLOS. That manual is online now: http://common-lisp.net/project/bknr/static/lmman/frontpage.html The object system is documented in this chapter: http://common-lisp.net/project/bknr/static/lmman/flavor.xml The paragraph about "defwrapper" gives a clear view into the machinery. -- http://mail.python.org/mailman/listinfo/python-list
