Python: best way to find out from which set the results of `symmetric_difference` are from? -


what best practice finding out set results of symmetric_difference from?

intersect = s1.symmetric_difference(s2)

the result should 

{'34':'s1', '66':'s2'}

where '34','66' unique items.

to cleanly, following should work:

intersect = s1.symmetric_difference(s2) result = dict([(i, ("s1" if in s1 else "s2")) in intersect])

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