compare lists of strings and remove any that are similar - python

Question

For example:

List1 = [1,2,3,4,5,6,7]

List2 = [3,4,5,6,7,8,9]

and I would like it to return [8,9] because 3,4,5,6 and 7 are in both lists.

Any ideas? Thanks in advance.

Answer 1

return list(set(List1) - set(List2))