intersection of three sets in python?

Posted by Phil Brown on Stack Overflow See other posts from Stack Overflow or by Phil Brown
Published on 2012-10-08T21:36:20Z Indexed on 2012/10/08 21:36 UTC
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Filed under:

python

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intersection

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sets

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set-intersection

Currently I am stuck trying to find the intersection of three sets. Now these sets are really lists that I am converting into sets, and then trying to find the intersection of.

Here's what I have so far:

for list1 in masterlist: list1=thingList1 for list2 in masterlist: list2=thingList2 for list3 in masterlist: list3=thingList3

d3=[set(thingList1), set(thingList2), set(thingList3)] setmatches c= set.intersection(*map(set,d3)) print setmatches

and I'm getting

set([]) Script terminated.

I know there's a much simpler and better way to do this, but I can't find one...

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