We're using tornadoweb which already runs an event loop single-threaded, and we want to use asyncio.run to run other coroutines, but it show error 'Event loop already running', found this library nest-asyncio that allows event loop to be nested, sorry not expert on threading or event loop, does nest-asyncio runs coroutines on separated thread?or no connection on threading?
1 Answers
If the event loop is already running, you can't call asyncio.run.
You have a few options:
1. Tornado's IOLoop.add_callback:
This will run the coroutine in the background (that means you won't be able to get it's result).
from tornado import ioloop
loop = ioloop.IOLoop.current() # get the current running event loop
loop.add_callback(coro_func) # coro_func is the coroutine you want to run
2. Use asyncio.create_task:
This will also allow you to get the coroutine's result.
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