Iain, thanks - very helpful. Really I'm trying to write a simulation program that goes through a number of objects that are linked to one another and does calculations at each object. The calculations might be backwards or fowards (i.e. starting at the supply or demand ends of the system and then working through the objects). And also, I might have multiple objects linked to a single object (upstream or downstream) - e.g. compressor -- multiple combusters - turbine
I like your idea of using something like a setStreams method to establish the linking. The streams do reflect each other, although having many-to-one and vice versa will complicate that. I have not quite got my head around having multiple links. In C++ I would be thinking about something like a linked-list but I'm not sure that's the right approach here. Dave -- http://mail.python.org/mailman/listinfo/python-list
