python runtime_error ai_generated true

运行时错误：不能在同步上下文中使用异步生成器。

RuntimeError: You cannot use async generator in sync context

ID: python/fastapi-async-sync-mixing

其他格式: JSON · Markdown 中文 · English
80%修复率
84%置信度
0证据数
2024-06-15首次发现

版本兼容性

版本状态引入弃用备注
3.x active — — —

根因分析

在 FastAPI 依赖或路由处理器中错误地混合异步和同步代码，例如在同步端点中调用异步函数。

English

Mixing async and sync code incorrectly in FastAPI dependencies or route handlers, e.g., calling async functions from sync endpoints.

generic

解决方案

  1. 95% 成功率 
    Define endpoint as async def if using async functions: @app.get('/')
async def read_root():
    result = await some_async_function()
  2. 90% 成功率 
    Use anyio.to_thread.run_sync for sync functions in async context: from anyio import to_thread
result = await to_thread.run_sync(sync_function)

无效尝试

常见但无效的做法:

  1. 90% 失败

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

  2. 85% 失败

    Calling async function returns coroutine object, not result; must be awaited.