Bruce Eckel wrote: >>>> class Flower: pass >>>> class Daisy(Flower): pass >>>> Daisy is Flower > 0 > > What am I missing here? A Daisy is *A* Flower, not *THE* Flower. Or in python, an instance of Flower, not the class Flower. Identity relationships from the real world of objects carry quite well to the world of python objects. cheers, f