我有一个以空列表开头的购物清单程序，用户在列表中输入输入

Question

用户不仅可以将项目添加到列表中，还可以从列表中弹出项目。 我似乎被困在用户从列表中弹出项目的位置，但 output 只需要显示已弹出该项目的第一个和最后一个字母。 例如

["Oranges" , "Apples" , "Mangoes"]
["O-----s" , "Apples" , "Mangoes"]

下面的代码是我到目前为止所拥有的：

add_item = []
choice = 0
while(True):
    choice = int(input('Welcome to your Shopping list! \n 1) Add Item \n 2) Check Off 
Item \n 3) Print list \n 4) Exit \n Enter a Choice: '))
    if choice == 1:
        add = input('What will you add to the list? ')
        add_item.append(add)
    elif choice == 2:
        remove = int(input('Which item will you check off? '))
        item_2 = add_item.pop(remove)
        
    elif choice == 3:
        for i, item in enumerate(add_item, 1):
            print(i,item.title())
    elif choice == 4:
        print('Goodbye!')
        break

Answer 1

创建 function 以查找弹出列表项的新值。

def popItemFromList(item):
    # find new value of item popped
    dash_string = ""
    if len(item) > 2:
        for i in range(0, len(item)-2):
            dash_string += "-"
    
    new_value = item[0] + dash_string + item[len(item)-1]
    return new_value

add_item = []
popped_list = []
choice = 0
while(True):
    print(f'current_list: {add_item }')
    print(f'popped_list: {popped_list}')
    choice = int(input('Welcome to your Shopping list! \n 1) Add Item \n 2) Check Off Item \n 3) Print list \n 4) Exit \n Enter a Choice: '))
    if choice == 1:
        add = input('What will you add to the list? ')
        add_item.append(add)
    elif choice == 2:
        remove = int(input('Which item will you check off? '))
        item_2 = add_item.pop(remove)
        popped_list.append(popItemFromList(item_2))

    elif choice == 3:
        for i, item in enumerate(add_item, 1):
            print(i,item.title())
    elif choice == 4:
        print('Goodbye!')
        break