he default executor.

This function cannot be called when another asyncio event loop is
running in the same thread.

If debug is True, the event loop will be run in debug mode.
If loop_factory is passed, it is used for new event loop creation.

This function always creates a new event loop and closes it at the end.
It should be used as a main entry point for asyncio programs, and should
ideally only be called once.

The executor is given a timeout duration of 5 minutes to shutdown.
If the executor hasn't finished within that duration, a warning is
emitted and the executor is closed.

Example:

    async def main():
        await asyncio.sleep(1)
        print('hello')

    asyncio.run(main())
Nz8asyncio.run() cannot be called from a running event loopr