efficient intersection of lists with rounding

[Michael Hoffman]

Steven Bethard wrote:

> Well, in Python 2.3, I believe sets are implemented in Python while 
> they're implemented in C in Python 2.4.

I think the Python 2.3 Sets implementation is likely to be quicker than 
whatever list-manipulation answer you come up with instead. But there's 
only one way to find out ;)
-- 
Michael Hoffman