On Tue, Aug 6, 2013 at 4:36 PM, BrJohan <brjo...@gmail.com> wrote: > Consider a botanical classification system (somewhat analogous to my > 'problem' as it effectively is related to classification of entities): > > A Domain should know about its Kingdoms, > a Kingdom should know about its Phylums, > ... > a Genus should know about its Species.
I don't believe it's that clear. In some situations it may be best to work that way; in others, each tier should know only those above it. Does the generic Widget know about being a PushButton, a ListBox, and a Slider? No, but the Slider knows what a Widget is. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
