What is proper way to require a method to be overridden?

[Robert Kern]

belinda thom wrote:

> I imagine the NotImplementedError is actually a defined object, but I  
> really don't know.

It is.

> So, back to my question: is a catalog of standard python errors  
> available? I've looked on the python site but had no success.

http://docs.python.org/lib/module-exceptions.html

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco