import copy # importer le module copy a = [[10],[20],[30]] b = copy.deepcopy(a) print "Avant la copie", "=>" print "a=> ", a print "b=> ",b # Modifier la copie originale a[0][0] = 0 a[1] = None print "Après la copie", "=>" print "a=> ", a print "b=> ",b """ Avant la copie => a=> [[10], [20], [30]] b=> [[10], [20], [30]] Après la copie => a=> [[0], None, [30]] b=> [[10], [20], [30]] """