Python-telegram-bot 在 telegram.error.TimedOut 上失败，无法重新启动（重新启动时获取“协程‘Updater.start_polling’从未等待”）

Question

我尝试为我的学校创建一个简单的 Telegram 机器人（以便学生可以在 Telegram 中接收时间表更新）。我为此使用 python-telegram-bot 。这是我从官方教程中获取的代码：

application = telegram.ext.ApplicationBuilder().token(token).build()

incoming_message_handler = telegram.ext.MessageHandler(
    telegram.ext.filters.TEXT & (~telegram.ext.filters.COMMAND),
    process_incoming_message
)

start_handler = telegram.ext.CommandHandler(
    'start',
    process_start_command
)

application.add_handler(start_handler)
application.add_handler(incoming_message_handler)
application.run_polling()

它工作正常，但我们没有那么好的互联网连接，我的机器人有时会崩溃并出现 telegram.error.TimedOut。

所以我决定使用无限循环和 try- except 来重新连接：

while True:
    try:
        application = telegram.ext.ApplicationBuilder().token(token).build()

        incoming_message_handler = telegram.ext.MessageHandler(
            telegram.ext.filters.TEXT & (~telegram.ext.filters.COMMAND),
            process_incoming_message
        )

        start_handler = telegram.ext.CommandHandler(
            'start',
            process_start_command
        )

        application.add_handler(start_handler)
        application.add_handler(incoming_message_handler)
        application.run_polling()
        
        break # exit the infinite loop
    except telegram.error.TimedOut:
        print('trying again')

但是我没有一次又一次地尝试，而是在第二次尝试时遇到了这个错误：

Traceback (most recent call last):
  File "bot.py", line 24, in __init__
    application.run_polling()
  File "~/.local/lib/python3.10/site-packages/telegram/ext/_application.py", line 765, in run_polling
    return self.__run(
  File "~/.local/lib/python3.10/site-packages/telegram/ext/_application.py", line 939, in __run
    loop.add_signal_handler(sig, self._raise_system_exit)
  File "/usr/lib/python3.10/asyncio/unix_events.py", line 99, in add_signal_handler
    self._check_closed()
  File "/usr/lib/python3.10/asyncio/base_events.py", line 515, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
sys:1: RuntimeWarning: coroutine 'Updater.start_polling' was never awaited

Answer 1

实际错误是

运行时错误：事件循环已关闭

因此 python-telegram-bot 库使用 asyncio 库并默认关闭事件循环，并且在捕获 TimedOut 异常后无法再次使用它。只需告诉库不要关闭事件循环，更改此：

application.run_polling()

对此：

application.run_polling(close_loop=False)