Python中输入No时如何重启程序？（VS Code环境）

你的问题出在两个核心点：

• 代码最后一行的exit()会强制终止程序，不管前面的逻辑走到哪一步
• 输入"No"时没有让循环回到开头，反而继续执行后续代码，最终触发exit()

关键调整方向 #

1. 删掉末尾的exit()，靠while True循环和continue/break控制流程
2. 当用户输入"No"时（统一转成小写，兼容大小写输入），用continue直接回到循环开头，重新启动输入流程
3. 第二个产品确认错误时，同样用continue重启整个程序
4. 所有流程完成后，添加退出选项，用break终止循环

修改后的完整代码 #

while True:
    product = input("Enter product name: ")
    price = float(input("What is the price of the product: "))
    print(f'''You want to save towards purchasing {product.title()} which costs {price} dollars(Can)''')

    correct = input("Is this correct, Yes or No: ").lower()  # 统一转小写，避免大小写识别问题
        
    if correct == "no":
        print("Re-enter correct data")
        continue  # 直接回到循环开头，重新输入

    if correct == "yes":
        add_a_second_product = input("would you like to add a second product, Yes or No: ").lower()

        if add_a_second_product == "no":
            current_saved = float(input("How much money do you currently have saved: "))
            needed = round(price - current_saved, 2)
            print(f'''You need {needed} more dollars''')
            
            if current_saved >= price:
                print(f'''you have {current_saved} dollars which is enough to purchase {product} for {price}$''')
            
            # 询问是否重启程序
            restart = input("Do you want to start over? Yes or No: ").lower()
            if restart == "yes":
                continue
            else:
                break  # 终止循环，退出程序

        if add_a_second_product == "yes":
            product2 = input("Enter second product name: ")
            price2 = float(input("What is the price of the second product: "))
            total_price = round(price + price2, 2)
            print(f'''You want to save towards purchasing {product.title()} and {product2.title()} which costs {total_price} dollars(Can)''')

            correct2 = input("is this correct, Yes or No: ").lower()
            if correct2 == "no":
                print("Re-enter correct data")
                continue  # 回到循环开头，重新输入

            if correct2 == "yes":
                current_saved2 = float(input("How much do you currently have saved: "))
                needed_total = round(total_price - current_saved2, 2)
                print(f'''You need {needed_total} more dollars''')
                
                if current_saved2 >= price:
                    print(f'''you have {current_saved2} dollars which is enough to purchase {product} for {price}$''')
                
                if current_saved2 >= total_price:
                    print(f'''you have {current_saved2} dollars which is enough to purchase both {product} and {product2}''')
            
            # 询问是否重启程序
            restart = input("Do you want to start over? Yes or No: ").lower()
            if restart == "yes":
                continue
            else:
                break

额外说明 #

• .lower()处理用户输入，不管输入"No"、"NO"还是"no"都能正确识别
• continue会跳过当前循环的剩余代码，直接回到while True的开头，实现程序重启效果
• 流程结束后增加了重启询问，不想继续时用break终止循环退出程序

内容的提问来源于stack exchange，提问作者Carter Luscombe