>> A series of examples seems more concrete than a formal description,<<
Amen. This is why people buy the books: The good ones have lots of examples. The wizards glance at them in passing and think, "Duh." And the rest of us (including the intermediate folks, I'll bet) are grateful for the chance to see a real live example. rd -- http://mail.python.org/mailman/listinfo/python-list
