Difference Between 2 files

[perfringo]

One should make unambiguous what does 'difference' means.

For example, using difflib.Differ() one will get differences as follows (provided data in files named diff_1.txt and diff_2.txt respectively):

with open('diff_1.txt', 'r') as x, open('diff_2.txt', 'r') as y:
    diff = difflib.Differ().compare(x.readlines(), y.readlines())
    different_rows = (value.strip() for value in diff if value.startswith(('+', '-')))
    print(*different_rows, sep='\n')

Output:
+ 4
+ 6
- 6
- 7