Jupyter notebook cannot start with python 3.8 in Windows 10 [duplicate]

Answer 1

Following one of the comments in this thread, I've solved the problem by:

1. Locate and open the asyncio.py file. In my case it's in C:\Users\[USERNAME]\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\tornado\platform\
2. After the line import asyncio add the following:

from sys import platform 
if platform == "win32":               
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy()) # python-3.8.0a4

This will force using SelectorEventLoop on Windows.