python3.8-運行jupyter 報raise NotImplementedError

經過多次查證 貌似是3.8版本的bug...

C:\Users\xxx\AppData\Local\Programs\Python\Python38\Lib\site-packages\tornado\platform\asyncio.py 這個文件，打開將下邊這句編輯進去，保存。

import asyncio
import sys
if sys.platform == 'win32' and sys.version_info > (3, 8, 0, 'alpha', 3) :
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())