用简单的收银机纸条算出总数

Question

我刚开始学习Python，如果能给我一些建议，我将不胜感激。在

当我试图保存“总价”列表中的最后一个总价时，它没有保存。 我做错什么了？在

还有，有没有更好的方法来写这个？ 谢谢你

price_list = {'gold': 10,
              'red': 20,
              'brown': 30
              }

vol_list = {'gold': 0.1,
            'red': 0.2,
            'brown': 0.3
            }

cl_list = {'gold': 100,
           'red': 200,
           'brown': 300
           }


while True:
    print("What do you want to buy?")
    choice = input("Choices: gold, red or brown > ")

    amount = int(input("How many do you want? >"))

    price = price_list[choice] * amount
    vol = (cl_list[choice] * amount) * vol_list[choice]

    total_price = []
    total_vol = []

    total_price.append(price)
    total_vol.append(vol)

    print_price = sum(total_price[:])
    print_vol = sum(total_vol[:])

    print("-" * 10)
    print("Your total is now: ", print_price)
    print("Your total vol is now: ", print_vol)
    print("-" * 10)

    cont = input("Do you want to continue shopping [Y/n]?> ")
if cont == "n" or cont == "no":
    print("#" * 10)
    print("#" * 10)
    print("Your total is: ", print_price)
    print("Your total vol is: ", print_vol)
    print("#" * 10)
    print("#" * 10)
    break

Answer 1

您正在while循环中初始化数组，因此每次新的迭代都会覆盖旧的total_price。在

在循环之前初始化数组

total_price = []
total_vol = []


while True:
...