Python Async Event Loop Error

Python is throwing an asyncio event loop error and the message means nothing to you. This explains what an event loop actually is and why Python is complaining about yours, names the likely cause from your code, then gives the fix, with the correct version for a Jupyter notebook, a plain script, or a FastAPI or Django app. For developers who want the cause, not just a patch.

I'm getting this asyncio error in Python: {ERROR_MESSAGE}. Code that caused it: {CODE_SNIPPET}. Context: {USAGE_CONTEXT}.

Explain in plain English what an event loop actually is and why Python is complaining about it here. Tell me the most likely cause given my code context. Then give me the fix, and if the fix is different for Jupyter notebooks versus a script versus a FastAPI or Django app, show me the right one for my situation.