Had a problem to find the difference of list of elements in two files

So here is a solution:

with open("file1.txt") as f:
    file_1_elements = f.read().splitlines()

with open("file2.txt") as f:
    file_2_elements = f.read().splitlines()


def Diff(li1, li2):
    return list(set(li1) - set(li2)) + list(set(li2) - set(li1))


print(Diff(file_1_elements,file_2_elements))

contents of file can be list of elements in each line

hello1
hello2
hello3