On 29 Apr., 05:41, Ross <ross.j...@gmail.com> wrote: > If I have a list x = [1,2,3,4,5,6,7,8,9] and another list that is a > subset of x: y = [1,4,7] , is there a quick way that I could return > the complementary subset to y.... z=[2,3,5,6,8,9] ? > > The reason I ask is because I have a generator function that generates > a list of tuples and I would like to divide this list into > complementary lists.
z = [u for u in x if u not in y] or z = [u for u in x if u not in set(y)] Since you are dealing with tuples and a natural order might not be that relevant you can also set objects in the first place: z = x - y -- http://mail.python.org/mailman/listinfo/python-list
