call asyncio.sleep(0.1) RuntimeError: no running event loop

[wood-j]

Hello, I have been using quamash with pyqt5 for 2 years, it works great(thanks alot to you). But recently my envirioment updated, I got error when calling asyncio.sleep(0.1) in pyqt views bisiness.

My environment:

• linux system with kernel 4.19
• python3.8
• Quamash ==0.6.1

Here is some test code could raise the same error as my business:

import sys
import asyncio
import quamash
from PyQt5 import QtWidgets


async def loop_func():
    for i in range(1000):
        print('hello')
        await asyncio.sleep(0.1)


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    loop = quamash.QEventLoop(app)
    asyncio.set_event_loop(loop)
    with loop:
        asyncio.ensure_future(loop_func(), loop=loop)
        loop.run_forever()

Output:

Task exception was never retrieved
future: <Task finished name='Task-1' coro=<loop_func() done, defined at /home/wood/project/data-manage-client/test.py:7> exception=RuntimeError('no running event loop')>
Traceback (most recent call last):
  File "/home/wood/project/data-manage-client/test.py", line 10, in loop_func
    await asyncio.sleep(0.1)
  File "/usr/lib64/python3.8/asyncio/tasks.py", line 637, in sleep
    loop = events.get_running_loop()
RuntimeError: no running event loop

I have search the same error: https://github.com/gmarull/asyncqt/issues/12 https://github.com/gmarull/asyncqt/pull/13

Refer to that, I solve it with:

    asyncio.set_event_loop(loop)
    asyncio.events._set_running_loop(loop)    # <--------------------------------------------
    with loop:
        ....