Question

将项目添加到列表中后，下次添加其他项目时，该项目将被删除。

food_choice = str(input("Do you want to add an item, remove an item or  search for a recipes? "))
food = []
if food_choice in ["Add", "add"]:
    food_to_add = str(input("Which item would you like to add? "))
    food.append(food_to_add)
    print(food_to_add, "has been addded to your fridge list.")
    print(food)

Answer 1

您需要初始化列表，然后重复添加项目。实现此目的的自然方法是将您的逻辑包装在while循环中，并添加一个结束循环的选项，例如关键字“结束”。

否则，就像您的代码中一样，food = []每次都会初始化一个新的空列表。

food = []

while True:
    food_choice = str(input("Do you want to add, remove, search, or end? "))

    if food_choice.lower() == 'end':
        break

    if food_choice.lower() == 'add':
        food_to_add = str(input("Which item would you like to add? "))
        food.append(food_to_add)
        print(food_to_add, "has been addded to your fridge list.")
        print(food)

用法示例：

Do you want to add, remove, search, or end? add
Which item would you like to add? banana
banana has been addded to your fridge list.
['banana']
Do you want to add, remove, search, or end? add
Which item would you like to add? orange
orange has been addded to your fridge list.
['banana', 'orange']
Do you want to add, remove, search, or end? end

为什么我的list.append不能永久添加我的项目？

1 个答案: