placid wrote:

> Why is there old and new classes? What are the differences?

the "what's new" document for the release where they were introduced 
(2.2) contains a nice overview, written from a "before and after" 
perspective:

     http://www.python.org/doc/2.2.3/whatsnew/sect-rellinks.html

(however, the exact details of the MRO algorithm was changed in 2.3; see
http://www.python.org/download/releases/2.3/mro for the full story)

</F>

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