python runtime_error ai_generated true

RuntimeError: asyncio.run() cannot be called from a running event loop

ID: python/asyncio-runner-not-found

Also available as: JSON · Markdown · 中文
80%Fix Rate
87%Confidence
0Evidence
2024-06-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.10 active — — —
3.11 active — — —

Root Cause

asyncio.run() is called inside an async function where an event loop is already running, causing a nested loop conflict.

generic

中文

在异步函数内部调用 asyncio.run()，此时事件循环已在运行，导致嵌套循环冲突。

Workarounds

  1. 95% success Use await directly instead of asyncio.run() 
    await some_coroutine()
  2. 90% success Use asyncio.create_task() to schedule the coroutine 
    task = asyncio.create_task(some_coroutine())
await task

Dead Ends

Common approaches that don't work:

  1. Using asyncio.get_event_loop().run_until_complete() instead 70% fail

    This still tries to run a new loop inside an existing one, leading to the same error.

  2. Wrapping the call in a thread to avoid loop conflict 50% fail

    asyncio.run() still needs a loop; running in a thread without proper loop setup may cause other issues.