RuntimeError：异常被忽略：<function_ProactorBasePipeTransport

我正在使用aiohttp、asyncio和codetiming来发出并发请求。我最近将 Python 升级到 3.9.0 版，但出现 RuntimeError: 程序运行后事件循环已关闭。我正在尝试使用队列数据结构发出异步请求...

import asyncio
import aiohttp
from codetiming import Timer
async def task(name, work_queue):
    timer = Timer(text=f"Task {name} elapsed time: {{:.1f}}")
    async with aiohttp.ClientSession() as session:
        while not work_queue.empty():
            url = await work_queue.get()
            print(f"Task {name} getting URL: {url}")
            timer.start()
            async with session.get(url) as response:
                await response.text()
            timer.stop()
async def main():
    # Create the queue of work
    work_queue = asyncio.Queue()
    # Put some work in the queue
    for url in [
        "http://google.com",
        "http://yahoo.com",
        "http://linkedin.com",
        "http://apple.com",
        "http://microsoft.com",
        "http://facebook.com",
        "http://twitter.com",
    ]:
        await work_queue.put(url)

    # Run the tasks
    with Timer(text="nTotal elapsed time: {:.1f}"):
        await asyncio.gather(
            asyncio.create_task(task("One", work_queue)),
            asyncio.create_task(task("Two", work_queue)),
        )

if __name__ == "__main__":
    asyncio.run(main())

我也得到了有效结果，但我不知道为什么会出现此运行时错误。输出如下：

Exception ignored in: <function _ProactorBasePipeTransport.__del__ at 0x0000020634355E50>
Traceback (most recent call last):
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 116, in __del__
    self.close()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 108, in close
    self._loop.call_soon(self._call_connection_lost, None)
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 746, in call_soon
    self._check_closed()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 510, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
Exception ignored in: <function _ProactorBasePipeTransport.__del__ at 0x0000020634355E50>
Traceback (most recent call last):
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 116, in __del__
    self.close()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 108, in close
    self._loop.call_soon(self._call_connection_lost, None)
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 746, in call_soon
    self._check_closed()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 510, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
Exception ignored in: <function _ProactorBasePipeTransport.__del__ at 0x0000020634355E50>
Traceback (most recent call last):
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 116, in __del__
    self.close()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 108, in close
    self._loop.call_soon(self._call_connection_lost, None)
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 746, in call_soon
    self._check_closed()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 510, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
Exception ignored in: <function _ProactorBasePipeTransport.__del__ at 0x0000020634355E50>
Traceback (most recent call last):
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 116, in __del__
    self.close()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 108, in close
    self._loop.call_soon(self._call_connection_lost, None)
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 746, in call_soon
    self._check_closed()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 510, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
Exception ignored in: <function _ProactorBasePipeTransport.__del__ at 0x0000020634355E50>
Traceback (most recent call last):
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 116, in __del__
    self.close()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasyncioproactor_events.py", line 108, in close
    self._loop.call_soon(self._call_connection_lost, None)
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 746, in call_soon
    self._check_closed()
  File "C:UsersDELLAppDataLocalProgramsPythonPython39libasynciobase_events.py", line 510, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed

回答