问题：安装jupyterlab出现
以上说明，install和安装库的源头没关系，那怎么解决？
这里引入了另外一个镜像网站：
http://pypi.doubanio.com/simple/
对应安装的命令为：
pip install 安装包名字 -i http://pypi.doubanio.com/simple/ --trusted-host pypi.doubanio.com
想要安装jupyterlab
安装jupyterlab出现 ERROR: Could not find a version that satisfies the requirement jupyter-lab (from versions: none)
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