Keeping track of subclasses and instances?

Steven D'Aprano steve at
Thu Oct 11 04:54:50 CEST 2007

On Thu, 11 Oct 2007 03:19:07 +0200, Karlo Lozovina wrote:

> Here is a longer description - I have a function that given input
> creates a custom class and returns it back. The user is free to subclass
> that (even more, he should do that), and of course he will make
> instances of those subclasses. Now, my question is how to keep track of
> subclasses and their instances, without the need for user interaction
> (appending them to a list, or adding to dictionary)?

The real question is why you think you need to keep track of them instead 
of letting the user and/or Python keep track of them, like any other 


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