已安装Jupyter Notebook 5.7.5版，但出现错误

Question

Installed Jupyter 5.7.5 and when I type jupyter notebook --version 5.7.5 is displayed but later when I type jupyter notebook I get the following error and tried all posssible solutions listed on StackOVerflow website but could not fix it.

Answer 1

我现在看到的问题是您正在使用Python 3.8，请按照之前的线程尝试以下操作：

1. 找到并打开asyncio.py文件。就我而言，它位于C：\ Users [USERNAME] \ AppData \ Local \ Programs \ Python \ Python38-32 \ Lib \ site-packages \ tornado \ platform \ asyncio.py
2. 在行导入asyncio之后添加以下内容：

import sys

if platform == "win32":               
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())