Trouver différent entre la liste
a = ['1', '2']
b = ['1', '2', '3', '4']
diff = list(set(a) - set(b))
['3', '4']
peamdev
a = ['1', '2']
b = ['1', '2', '3', '4']
diff = list(set(a) - set(b))
['3', '4']