如何为餐厅小费账单生成器的所有场景实现统一打印语句？

要解决重复打印收据的问题，核心思路是把打印逻辑封装成独立函数，所有场景直接调用该函数即可，避免重复代码。以下是优化后的完整代码：

def print_receipt(subtotal, tax, tip):
    final_total = subtotal + tax + tip
    print("\nSubtotal: $", round(subtotal, 2), sep="")
    print("Tax Owed: $", round(tax, 2), sep="")
    print("Tip: $", round(tip, 2), sep="")
    print("Final Total: $", round(final_total, 2), sep="")

# 获取并验证小计
subtotal = float(input("Please enter the subtotal of your bill: $"))
if subtotal <= 0:
    print("Please enter a valid positive subtotal.")
    exit()

# 展示小费选项
print("\nPlease select an option:")
print("1. Enter tip percentage (%)")
print("2. Enter tip amount ($)")
print("3. No tip")
choice = int(input("How would you like to tip? "))
tax = subtotal * 0.13
tip = 0  # 初始化小费变量

# 处理不同小费选项
if choice == 1:
    tip_percentage = float(input("Please enter the percentage you would like to tip (%): "))
    if tip_percentage > 0:
        tip = subtotal * (tip_percentage / 100)
        print_receipt(subtotal, tax, tip)
    else:
        print("Please enter a valid positive percentage.")
elif choice == 2:
    tip_amount = float(input("Please enter the tip amount: $"))
    if tip_amount > 0:
        tip = tip_amount
        print_receipt(subtotal, tax, tip)
    else:
        print("Please enter a valid positive tip amount.")
elif choice == 3:
    print_receipt(subtotal, tax, tip)
else:
    print("Invalid option selected. Please try again.")

关键优化点： #

• 封装打印函数：将重复的4行print语句抽成print_receipt函数，后续无论哪种小费场景，只需调用该函数即可。如果以后需要修改收据格式（比如调整小数位数、添加货币符号），只需修改这一个函数，不用逐个分支修改。
• 统一变量管理：用一个tip变量存储所有场景下的小费金额，避免原代码中tip_1、tip_2、tip_3这类冗余变量，逻辑更清晰。
• 简化验证逻辑：先统一验证小计的合法性，不合法直接退出；小费的合法性检查也按分支单独处理，错误提示更明确。
• 优化输入类型：将选项输入choice改为int类型，符合选项是整数的实际场景，避免float类型可能带来的判断问题。

内容的提问来源于stack exchange，提问作者coder J