my_foods = ['apple','pizza','cake'] friend_foods = my_foods my_foods.pop() print(friend_foods) #显示['apple','pizza'] #所以这不是复制列表,这属于赋值,python让两个变量同时指向了一个列表 #列表复制如下 my_foods = ['apple','pizza','cake'] friend_foods = my_foods[:] my_foods.pop() print(friend_foods) #['apple','pizza','cake']