# asyncio.exceptions.CancelledError

- **ID:** `python/asyncio-cancel-error-on-shutdown`
- **领域:** python
- **类别:** runtime_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

关闭期间任务被取消，finally 块中等待清理操作时未处理 CancelledError。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 3.11 | active | — | — |

## 解决方案

1. **** (85% 成功率)
   ```
   await asyncio.shield(cleanup()) within finally to protect cleanup from cancellation
   ```
2. **** (90% 成功率)
   ```
   asyncio.run(main()) handles cancellation gracefully by cancelling all remaining tasks
   ```

## 无效尝试

- **** —  (70% 失败率)
- **** —  (60% 失败率)