How to find out unique elements of list1 from list2

Question

Let's:
l1 = [1,2,3,4,5]
l2 = [3,4,5]

output should be [1,2]

Answer 1

Here is a version using set() and difference():

a = [1,2,3,4,5]
b = [3,4,5]
print(set(a).difference(set(b)))

Answer 2

List comprehension
a=[1,2,3,4,5]
b=[3,4,5]
print([i for i in a if i not in b])

Answer 3

print( set(l1) - set(l2))