Python 异步请求抛出错误：对象 NoneType 不能在“await”表达式中使用

Question

我正在使用streamlit hello示例应用程序测试tornado websocket api，

我向tornado.websocket.WebSocketHandler get方法添加了一个异步包装器来记录websocket连接

# pip3 install streamlit
# streamlit already have inbuilt example hello
# you can start it by streamlit hello

#create a async wrapper
def async_wrapper(original):
    async def wrapper(*args, **kwargs):
        try:
            print("websocket connection")
            res = await original(*args,**kwargs)
            return res
        except Exception as exc:
            raise exc
    return wrapper

# copy paste the above code in tornado.websocket file and add decorator @async_wrapper to get method

对我来说，异步包装器没有获取任何对象，并且抛出 NonType object not waitable 错误

2024-02-05 17:59:39.786 Uncaught exception GET /_stcore/stream (::1)
HTTPServerRequest(protocol='http', host='localhost:8501', method='GET', uri='/_stcore/stream', version='HTTP/1.1', remote_ip='::1')
Traceback (most recent call last):
  File "/env/lib/python3.10/site-packages/tornado/web.py", line 1790, in _execute
    result = await result
  File "wrapper.py", line 157, in wrapper
    raise exc
  File "wrapper.py", line 146, in wrapper
    res = await original(*args, **kwargs)
  File "/env/lib/python3.10/site-packages/tornado/websocket.py", line 273, in get
    await self.ws_connection.accept_connection(self)
  File "/env/lib/python3.10/site-packages/tornado/websocket.py", line 863, in accept_connection
    await self._accept_connection(handler)
  File "/env/lib/python3.10/site-packages/tornado/websocket.py", line 946, in _accept_connection
    await self._receive_frame_loop()
  File "/env/lib/python3.10/site-packages/tornado/websocket.py", line 1102, in _receive_frame_loop
    await self._receive_frame()
  File "/env/lib/python3.10/site-packages/tornado/websocket.py", line 1193, in _receive_frame
    await handled_future
TypeError: object NoneType can't be used in 'await' expression

任何人都可以解释一下问题是什么吗

Answer 1

由于它不是异步的，因此删除

await

关键字：

original(*args,**kwargs)