Castironpi and Dennis, WOW! Thank you very much for your examples!!!
I wasn't trolling for free development, just whether such a library existed and/or design ideas (basic object or generator). I had started to develop my own solution which was much more complicated (re: ugly) than your 2 very elegant approaches. Its interesting to compare your two very different approaches. I will to spend some more time studying your techniques before I choose a final approach. Thank you both again. I'm learning a lot of Python by studying your examples! :) Malcolm -- http://mail.python.org/mailman/listinfo/python-list
