s = set([2,3,4]) t = set([3,4,5]) u = set([1,3,5]) print s s.difference_update(t) u.difference_update(t) print s print u print s == set([2]) print u == set([1]) s = set([2,3,4]) t = set([3,4,5]) t.difference_update(s, u) print t print t == set([5])
