如何在输入非int类型时触发自定义错误提示？

修正后的代码 #

import os
# 定义跨平台清屏命令
clear = 'cls' if os.name == 'nt' else 'clear'

def rating_system():
    rate = input("\nWould you like to rate your experience with MealMatcher? (y/n) ")

    if rate.lower() in ["yes", "y", "yeah"]:
        try:
            star = int(input("How would you rate our service on a scale of 1 to 10? "))
        except ValueError:
            # 捕获非整数输入异常
            os.system(clear)
            print("Answer not Recognised.")
            rating_system()
            return

        if 1 <= star <= 10:
            os.system(clear)
            confirmation = input(f"Thank you for your rating! | You gave our service {star} stars out of 10, is that correct? (y/n) ")
            if confirmation.lower() in ["yes", "y", "yeah"]:
                os.system(clear)
                close = input("Thank you for using MealMatcher! Would you like to close? (y/n)")
                if close.lower() in ["yes", "y", "yeah"]:
                    os.system(clear)
                    print("Closing Application... | Thank you for using MealMatcher" * 3)
                    raise SystemExit
                elif close.lower() in ["no", "n", "nope"]:
                    os.system(clear)
                    print("Well you have to...")
                    print("*kicks out*")
                    print("\x1B[3m" + "User in your channel was banned from the server." + "\x1B[0m")
                    raise SystemExit
                else:
                    os.system(clear)
                    print("Answer Invalid")
                    rating_system()
            elif confirmation.lower() in ["no", "n", "nope"]:
                os.system(clear)
                print("Retrying Statement... \n")
                rating_system()
            else:
                os.system(clear)
                print("Answer Invalid")
                rating_system()
        else:
            os.system(clear)
            print("That is not a valid answer | Try again: \n")
            rating_system()
    elif rate.lower() in ["no", "n", "nope"]:
        os.system(clear)
        print("Closing Application | Thank you for your time. \n" * 3)
        raise SystemExit
    else:
        os.system(clear)
        print("Answer Invalid \n")
        rating_system()

关键修改说明 #

• 捕获非整数输入：用try-except块包裹整数转换操作，当输入无法转为int时触发ValueError，直接输出目标错误提示并重新调用函数。
• 修复语法错误：原代码中else块缩进混乱，调整后让条件分支逻辑清晰，避免语法报错。
• 优化范围判断：将star in range(0,11)改为1 <= star <=10，贴合“1到10分”的业务需求（原逻辑包含0，不符合评分场景）。
• 提升输入兼容性：添加.lower()让输入不区分大小写，减少用户输入失误。
• 补充清屏变量：原代码未定义clear变量，补充跨平台的清屏命令，避免运行报错。

内容的提问来源于stack exchange，提问作者user19574555