Find elements NOT in the intersection of two lists

Question

So I know how to find the intersection of two lists by doing:

>>> a = [1,2,3,4,5]
>>> b = [1,3,5,6]
>>> list(set(a) & set(b))
         


        

Answer 1

Symmetric difference?

>>> set(a).symmetric_difference(b)
{2, 4, 6}

Answer 2

I usually prefer a shortcut:

set(a) ^ set(b)
{2, 4, 6}