# list1 = [[1,2,3],[4,5,6],[7,8,9]] # n = int(input()) # for out_x in list1: # for inn_x in out_x: # inn_x *= n # 列表元素是不可变的,只是提供了索引,因此并不可行!正确的做法是要索引赋值 # print(list1) list1 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] n = int(input("")) # 直接通过索引对原始列表中的元素进行操作 for out_x in range(len(list1)): for inn_x...