Python-Telegram-Bot ConversationHandler 无法接收消息

Question

我正在使用 Python-Telegram-Bot 包。我的电报机器人无法接收状态为FIRST 的消息。发送我的机器人/start 后，我会收到start_command 中所示的短信提示。但是，在向机器人发送 url 后，机器人无法接收消息，如我的消息右下角的“单勾”所示。

# Stages
FIRST, SECOND = range(2)

def start_command(update: Update, context: CallbackContext):
    update.message.reply_text("""
To use: 
1. Send the google sheets URL and sheet name to this telegram bot in the following format:
your_google_sheets_url (your_sheet_name)
""")
    global user_id
    user_id = update.message.from_user['id']

    return FIRST


def select(update: Update, context: CallbackContext):
    if update.message.text:
        user_input = update.message.text
        update.message.reply_text('I have received your Google Sheets!')
    reply_markup = InlineKeyboardMarkup(build_menu(button_list, n_cols=1))
    update.message.reply_text('Please choose the headers:', reply_markup=reply_markup)

    return SECOND

    dp = updater.dispatcher
    dp.add_handler(CommandHandler("start", start_command))
    conv_handler = ConversationHandler(
        entry_points=[CommandHandler('start', start_command)],
        states={
            FIRST: [MessageHandler(Filters.text, select)],
            SECOND: [CallbackQueryHandler(display)],
        },
        fallbacks=[CommandHandler('cancel', cancel)],
    )
    dp.add_handler(conv_handler)

Answer 1

不应添加 start 的 CommandHandler。这是因为当用户输入/start时，会调用CommandHandler而不是ConversationHandler来处理命令。