Fredrik Lundh wrote: > please don't hit reply to arbitrary messages when you're posting new > messages; it messes up the message threading. > > Chaz Ginger wrote: > >> I was writing some code that used someone else class as a subclass. He >> wrote me to tell me that using his class as a subclass was incorrect. >> I am wondering under what conditions, if ever, does a class using a >> subclass not work. > > your terminology is confused: if you inherit from another class, *your* > class is the subclass, while the class you inherit from is known as a > "base class" or "super class". > > a subclass will share the instance namespace with the base class, which > means, among other things, that you may accidentally override internal > attributes and methods, and thus break the base class. > > and even if it appears to work now, it may break when you upgrade the > base class. or when you end up in a code path that you haven't tested > before. > > </F> > Sorry for the threading screw up. I thought I had just hit the write button.
I understand when my class overrides the super class. But that would just be "normal" class related things. I was wondering if there was something more subtle I am missing in Python class handling. Chaz -- http://mail.python.org/mailman/listinfo/python-list
