Home/ Questions/Error: runtimeerror this event loop is already running – quick tips
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Alma Walsh
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Asked: 2022-05-18T15:34:03+00:00 In:

Error: runtimeerror this event loop is already running – quick tips

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Hi everyone, I’m learning about python. While working, I try calls asyncio.get_event_loop().run_until_complete(foo()) twice. Once from foo() and second time from function called by foo(). As a result, I get the message:

RuntimeError: This event loop is already running in python

What can I do about the “runtimeerror this event loop is already running” issue? Is there a better approach?

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2 Answers

  1. Best Answer
    Expert

    The cause: You might have a misunderstanding about how asyncio works because Event loop running – is an entry point of your async program. It oversees the execution of all coroutines, tasks, and callbacks. Running a loop while it’s running makes no sense: it’s like trying to run a job executor from a job executor that’s already running.

    The solution: You can fix this issue by using nest_async or asyncio

    Solution #1

    Simply follow these steps to install the package:

    pip install nest-asyncio

    Then add the following lines:

    import nest_asyncio 
nest_asyncio.apply()

    Solution #2

    If nest asyncio isn’t working, try using asyncio:

    import asyncio 
asyncio.set_event_loop(asyncio.new_event_loop())
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  2. The nest_async solved the problem. 

    pip install nest-asyncio

    Add the following lines to my file 

    import nest_asyncio
nest_asyncio.apply()
__import__('IPython').embed()
    • 11

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