John Henry wrote: > What's the cleanest way to say: > > 1) Give me a list of the items that are in all of the sets? (3 in the > above example) > 2) Give me a list of the items that are not in all of the sets? (1,2 in > the above example) > > Thanks,
If you have an arbitrary list of sets, reduce comes in handy: See this recipe: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/476215 py> sets = [set((1, 2, 3)), set((2, 3)), set((1, 3))] py> reduce(set.intersection, sets) set([3]) py> reduce(set.union, sets) set([1, 2, 3]) py> reduce(set.union, sets) - reduce(set.intersection, sets) set([1, 2]) -- Brian Beck Adventurer of the First Order -- http://mail.python.org/mailman/listinfo/python-list
