“RuntimeError: This event loop is already running”; debugging aiohttp, asyncio and IDE “spyder3” in python 3.6.5

Question

I\'m struggling to understand why I am getting the \"RuntimeError: This event loop is already running\" runtime error. I have tried to run snippets of code from \"https://aiohtt

Answer 1

Looks to me Spyder runs its own event loop. You cannot run two event loops in a single thread.

asyncio.run(coro, *, debug=False)

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

This is what worked for me. I start my own loop if there is not other running loop:

import asyncio

async def say_after(delay, what):
    await asyncio.sleep(delay)
    print(what)

async def main():
    await say_after(2, 'done')

await say_after(1, 'ahoy')    

loop = asyncio.get_event_loop()
print(loop) # <_WindowsSelectorEventLoop running=True closed=False debug=False>
if loop.is_running() == False:
    asyncio.run(main())
else:
    await main()