A question about 'Event loop is closed'

[fc5igm]

I will appreciate it if anyone could give me some help!
My code:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

import asyncio import aiohttp from lxml import etree import requests headers = {     'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36' } async def download(url):     name = url.rsplit('/',1)[1]     async with aiohttp.ClientSession() as session:         async with session.get(url) as res:             with open(f'彼岸桌面壁纸下载/{name}','wb') as f: # '彼岸壁纸下载' is a directory I builded before.                 f.write(await res.content.read()) async def main():     tasks=[]     for url in urls:         tasks.append(download(url))     await asyncio.wait(tasks) if __name__ == '__main__':     url0 = 'https://www.enterdesk.com/zhuomianbizhi/'     text = requests.get(url0).text     tree = etree.HTML(text)     urls = tree.xpath('/html/body/div[13]/div[1]/div/dl/dd/a/img/@src')     asyncio.run(main())

Error:

Error:
D:\MyPcharmProject\venv\Scripts\python.exe D:/MyPcharmProject/爬虫/Umei.py
Exception ignored in: <function _ProactorBasePipeTransport.__del__ at 0x0000023AD6F1C670>
Traceback (most recent call last):
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python38\lib\asyncio\proactor_events.py", line 116, in __del__
    self.close()
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python38\lib\asyncio\proactor_events.py", line 108, in close
    self._loop.call_soon(self._call_connection_lost, None)
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py", line 711, in call_soon
    self._check_closed()
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py", line 504, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
Process finished with exit code 0

It seem that pictures have been captured. However, I can't make this error disappear even though I use try-except!

[deanhystad]

Have you used asyncio before? I would expect to see code setting up an event loop and tasks added to the event loop.

[fc5igm]

Have you used asyncio before? I would expect to see code setting up an event loop and tasks added to the event loop.

Yeah...But in the new vision, we can omit loop.create_task and put list which contains coroutine function into asyncio.wait directly. And then, use asyncio.run instead get_event_loop and loop.close, isn't it? If there is anything wrong, I'm willing to be refuted.

[skdaro]

for me:

1	asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

solves this issue.

buran write Oct-01-2024, 11:47 AM:
Please post all code, output and errors (it it's entirety) between their respective tags. Refer to BBCode help topic on how to post. Use the "Preview Post" button to make sure the code is presented as you expect before hitting the "Post Reply/Thread" button.