Jupyter Notebook安装与使用_warning: the scripts jupyter-migrate.exe, jupyter-

Jupter Notebook
安装问题
因为之前安装了python环境，所以选择使用 pip安装Jupyter Notebook。
win+r cmd
pip install Jupyter Notebook
但遇到了两种问题：

1.WARNING: The scripts jupyter-migrate.exe, jupyter-troubleshoot.exe and jupyter.exe are installed in ‘C:\Users\Caroline\AppData\Roaming\Python\Python39\Scripts’ which is not on PATH.

解决办法：将’C:\Users\Caroline\AppData\Roaming\Python\Python39\Scripts 添加到环境变量Path中
高级系统设置——环境变量——Path

2.WARNING: You are using pip version 20.0.2, however version 20.2.3 is available. 解决办法：升级pip python -m pip install --upgrade pip -i https://pypi.douban.com/simple

 ***不要直接win+R然后cmd，而是要选择“开始”—“Windows系统”—“命令提示符”—右键“以管理员身份运行”！！！***
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然后再重新安装 pip install Jupyter Notebook 就成功了。
最后开启Jupyter Notebook服务器，默认浏览器会打开以下页面，打不开输入网址http://localhost:8888/tree