Python3.x aiogram机器人中处理文本输入异常而不是按钮点击的回调函数.

Friends，我正在学习创建简单的机器人.我自己也在为互联网上的问题寻找解决方案.但是现在我离不开你们的经验，我希望能得到你们的帮助！

Expected Result:个

1. 通过启动命令，我们启动机器人.
2. 此时会出现一条消息:"来自机器人的Hello！"在它下面有一个按钮:" Select 一个城市"
3. 当你按下按钮:" Select 一个城市"时，题词就会出现:"你的城市:"和一些带有城市名称的按钮.
4. 用户点击其中一个带有城市名称的按钮.

5.之后，带有城市的按钮消失，发送给聊天的文本显示按下的城市名称按钮.

6.Total:在code变量中，我们获得城市的名称.

Problem:个 在第3步之后，除了单击带有城市的任何按钮外，用户还可以在文本字段中输入内容.然后折叠按钮，如果输入了按钮上指示的城市名称以外的其他内容，则该过程将停止，因为城市名称是稍后发送请求所需的参数.

Solution:个 需要在第三步之后捕获除指定按钮名称之外的任何文本输入，如果文本！=其中一个按钮的名称=&gt；，则需要:

1. 显示您需要 Select 城市的消息！
2. 再次显示带有城市名称的按钮.
3. 捕获正确的名称并将其写入变量，该名称可以通过单击按钮或用户在文本字段中输入与城市名称完全匹配的名称来获得.

Regarding the expected result，一切对我来说都解决了，但我无法处理这个问题--输入错误或用户在文本字段中意外点击……我try 将其包装在While Loop中，但无法获得正确的响应. 如何才能解决这个问题？

from aiogram import Bot, Dispatcher, executor, types
from aiogram.dispatcher.filters.state import StatesGroup, State
from aiogram.contrib.fsm_storage.memory import MemoryStorage
from aiogram.types import InlineKeyboardMarkup, InlineKeyboardButton
import asyncio
import os as OSis
 
bot = Bot(token=OSis.getenv("TOKEN"), parse_mode=types.ParseMode.HTML)
dp = Dispatcher(bot, storage=MemoryStorage())
 
 
# State class:
class UserAnswer(StatesGroup):
    City = State()
 
 
@dp.message_handler(commands="start")
async def start(message: types.Message):
    # add button:
    markup = InlineKeyboardMarkup()
    start_button = InlineKeyboardButton(text='Select a city', callback_data="town_id")
    markup.add(start_button)
    await bot.send_message(message.chat.id, "Hello from the bot!", reply_markup=markup)
 
 
# Handler for displaying the result of a button click: start_button
@dp.callback_query_handler(lambda c: c.data == "town_id")
async def button_press(call: types.callback_query):
    """Displaying a list of cities in the form of buttons"""
    list_cities = ['Washington', 'Montgomery', 'Phoenix', 'Atlanta', 'Boise', 'Frankfort', 'Boston', 'Springfield', 'Helena', 'Nashville']
    while True:
        keyboard = types.ReplyKeyboardMarkup(resize_keyboard=True, one_time_keyboard=True)
        for name in list_cities:
            keyboard.row(types.KeyboardButton(name))
        await bot.answer_callback_query(call.id)
        await bot.send_message(call.message.chat.id, "Your city:", reply_markup=keyboard)
        # Set the status for the 1st response:
        await UserAnswer.City.set()
 
        # I tried to write the code below to handle the exception...
        enter_city = await get_answer_correct(call.message)
        if any(enter_city in item for item in list_cities):
            break
        else:
            await bot.send_message(call.message.chat.id, "CHOOSE YOUR CITY:", reply_markup=keyboard)
            await asyncio.sleep(5)  # I tried to slow down the loop but it didn't work
 
@dp.message_handler(state=UserAnswer.City)
async def get_answer_correct(message: types.Message):
    # Recording the user's response after clicking the city button or entering text in the field
    answer_correct_city = message.text
    print('answer_correct_city =', answer_correct_city)
    return answer_correct_city

def main():
    executor.start_polling(dp)

if __name__ == '__main__':
    main()