python - 列表换行符

Question

我有一个可以工作的脚本，但它没有按照我想要的方式工作:

print('Add as many items to the basket as you want. When you are done, enter "nothing".')
print('What do you want to put into the basket now?')
basket = []
while True:
    myInput = input()
    if myInput == "nothing":
        print('There are ' + str(len(basket)) + ' items in the basket: '+ str(basket))
        break
    else:
        basket.append(myInput)
        print('Okay, what else?')

最后一行应该是这样的:

There are 3 items in the basket: 
Item 1: a sandwich
Item 2: two cans of Dr Pepper
Item 3: some napkins

有什么建议吗？

Answer 1

使用enumerate起始索引为 1 和 str.format:

while True:
    myInput = input()
    if myInput == "nothing":
        print('There are {} items in the basket: '.format(len(basket)))
        for ind, item in enumerate(basket,1):
            print("Item{}: {} ".format(ind,item))
        break
    else:
        basket.append(myInput)
        print('Okay, what else?')

您还可以使用列表理解和 iter 而无需 while 循环，它会一直循环直到用户输入 sentinel 值 "nothing":

print('Add as many items to the basket as you want. When you are done, enter "nothing".')
print('What do you want to put into the basket now?')
basket = [ line for line in iter(lambda:input("Please enter an item to add"), "nothing")]

print('There are {} items in the basket: '.format(len(basket)))
for ind,item in enumerate(basket,1):
    print("Item{}: {} ".format(ind,item))