[Tutor] When to Chop Suey...

[alan.gauld@bt.com]

> I am writing a med sized program and I'm wondering if anyone 
> has advice on when to chop off a bunch of classes from my 
> main module and put it in another one?  

Generally I always put class definitions in separate modules to 
the main program. That way I can reuse the classes and the main 
program just creates some objects and uses them.

As to how many classes per module I suggest that mutually dependant 
classes go in the same module - thus if you can't create an A without 
also having to create a B keep A and B together. As somebody famous 
said (Robert Martin?) "the unit of reuse is the category" which is a 
reference to the old Booch notation for a group of classes that work 
together. Categories in Booch translate to modules in Python.

Alan G