Javier, Allen, Kent, Liam Hmm, I think I understand what you all are saying. Basically, my familiar take on "code reuse" (the function model) as used in the utility is essentially not rewriting any more of a block than what is different, as opposed to "do all" blocks with convoluted switching. Whereas what it seems to me you are saying is levels of functional abstraction more akin to the Unix model.
My only prior experience with OOP was with Lingo several years ago in a variable record file use, which was simple to grasp. Obviously my take is flawed, so I will study the material noted, reread my Learning Python Part VI, and take another stab at it. No doubt this is "rank amateurish" to you all - somewhat like I felt back in the 80's when a "senior analyst" asked me how to use more than one output file in a COBOL program ;') Anyway, starting with assembler in the 60s, and doing my last substantial technical work in the 80s with C and Pascal, I have a bit of catching up to do :~) Thank you all for pointing me in the right direction, Lee C _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor