Standard ways to get union, intersection, difference of lists?

[John Hunter]

>>>>> "Mike" == Mike C Fletcher <mcfletch at rogers.com> writes:

    Mike> I've back-ported sets to 2.2.2.  It was a matter of
    Mike> implementing a few functions from itertools (which is a
    Mike> Python module IIRC).  Here's the majority of the backporting
    Mike> code:

Worked like a charm -- thanks!

John Hunter