如何计算Python汽车驾驶体验程序的总费用？

原代码的关键错误点 #

• 额外圈数费用添加错误：final_cost.append(cars_prices[add_laps])中add_laps是"Yes"，并非车型，会触发KeyError；正确做法是将圈数总费用num_of_laps * laps_cost添加到费用列表
• 总费用计算与展示错误：final_cost.append(cars_prices)会把整个价格字典加入列表，且append()方法返回None，导致最终打印的总费用为None；需用sum()计算所有费用的总和
• 手机号输入类型错误：用int()接收手机号，若号码含前缀或长度超出整数范围会报错，应改用str()
• 错误车型选择无重试逻辑：用户输入无效车型时，当前循环直接跳过，未提供重新选择的机会
• 选中车型打印格式错误：print("\nYou have selected to drive the", {select_cars})会将车型显示为集合格式（如{'Ferrari'}），应直接输出变量值
• 圈数费用打印错误：原代码打印final_cost列表，而非单独的圈数费用

修正后的完整代码 #

cars_list = ["Lamborghini", "Ferrari", "Porsche", "Audi", "BMW"]
cars_prices = {"Lamborghini":50, "Ferrari":45, "Porsche":45, "Audi":30, "BMW":30}
laps_cost = 30
final_cost = []
final_order = {}

# 获取用户选择的车辆数量，限制1-5辆
cust_num_cars = int(input("Please enter the number of cars you want to drive in this session: "))
while cust_num_cars > 5 or cust_num_cars < 1:
    cust_num_cars = int(input("You can only drive 1 to 5 cars! Please try again.\n Enter cars: "))

# 循环选择车辆，支持错误重试
for index in range(cust_num_cars):
    while True:
        print("\nChoose a car type from the following list:", cars_list)
        select_car = input("Select a car type: ")
        if select_car in cars_list:
            print(f"\nYou have selected to drive the {select_car}")
            final_cost.append(cars_prices[select_car])
            final_order[f"Car {index+1}"] = select_car
            break
        else:
            print(f"\n{select_car} is not in the available list of cars to drive! Please try again.")

# 获取用户信息，手机号用字符串存储避免格式错误
cust_name = input("\nPlease enter your full name: ")
cust_address = input("Please enter your full address: ")
cust_phone_num = input("Please enter your mobile phone number: ")

# 处理额外圈数选择
total_laps_cost = 0
add_laps = input("\nWould you like to drive additional laps? (Yes/No): ").strip().capitalize()
if add_laps == "Yes":
    num_of_laps = int(input("Number of additional laps: "))
    print(f"\nYou have selected {num_of_laps} additional laps!")
    total_laps_cost = num_of_laps * laps_cost
    final_cost.append(total_laps_cost)
else:
    print("\nYou have selected no additional extra laps.")

# 计算并展示总费用
total_cost = sum(final_cost)
print(f"\nTotal laps cost: £{total_laps_cost}")
print("\n----Order & Billing summary----")
print("Customer Full Name:", cust_name)
print("Customer Address:", cust_address)
print("Customer Phone Number:", cust_phone_num)
print("Selected Cars:", final_order)
print(f"Total cost: £{total_cost}")

核心修改说明 #

1. 修复圈数费用逻辑：单独计算圈数总费用并添加到费用列表，避免KeyError
2. 正确计算总费用：用sum(final_cost)求和所有车辆与圈数费用，直接打印结果
3. 手机号改为字符串输入：适配各种号码格式，避免转换错误
4. 增加车型选择重试：嵌套循环确保用户输入有效车型才进入下一步
5. 优化打印格式：用f-string实现清晰的格式化输出
6. 补充车辆数量下限检查：防止用户输入0或负数车辆数量

内容的提问来源于stack exchange，提问作者Josh