Org = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i']
mod = ['i', 'b', 'c', 'z', 'd', 'f', 'g', 'h', 'a']
differences = set(difflib.ndiff(Org, mod))
python, detecting elements have been removed/added/changed positions in a list