如何编写/back命令Python电报机器人？

import logging
from telegram.ext import Updater, CommandHandler

logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
                     level=logging.INFO)
logger = logging.getLogger(__name__)

def back(update, context):
    # 在这里编写/back命令的逻辑代码
    # 可以通过update.message.reply_text()方法回复消息给用户
    update.message.reply_text("您触发了/back命令！")

updater = Updater(token='YOUR_TELEGRAM_BOT_TOKEN', use_context=True)

dispatcher = updater.dispatcher
back_handler = CommandHandler('back', back)
dispatcher.add_handler(back_handler)

updater.start_polling()

import logging
from telegram.ext import Updater, CommandHandler

logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
                     level=logging.INFO)
logger = logging.getLogger(__name__)

def back(update, context):
    update.message.reply_text("您触发了/back命令！")

def main():
    updater = Updater(token='YOUR_TELEGRAM_BOT_TOKEN', use_context=True)
    dispatcher = updater.dispatcher
    back_handler = CommandHandler('back', back)
    dispatcher.add_handler(back_handler)
    updater.start_polling()
    updater.idle()

if __name__ == '__main__':
    main()