>>> a = set([1, 2, 3, 4]) >>> b = set([3, 4, 5, 6]) >>> a | b # Union {1, 2, 3, 4, 5, 6} >>> a & b # Intersection {3, 4} >>> a < b # Subset False >>> a - b # Difference {1, 2} >>> a ^ b # Symmetric Difference {1, 2, 5, 6}