Python #447 LIKE 0 0 def delta( listToDelta ): result = [] lastItem = listToDelta[0] for i, item in enumerate(listToDelta): if i == 0: result.append(item) else: result.append(item-lastItem) lastItem = item return result l = [2, 4, 6, 9, 7] print(l) l = delta(l) print(l)