問題：安裝jupyterlab出現
以上說明，install和安裝庫的源頭沒關系，那怎么解決？
這里引入了另外一個鏡像網站：
http://pypi.doubanio.com/simple/
對應安裝的命令為：
pip install 安裝包名字 -i http://pypi.doubanio.com/simple/ --trusted-host pypi.doubanio.com
想要安裝jupyterlab
安裝jupyterlab出現 ERROR: Could not find a version that satisfies the requirement jupyter-lab (from versions: none)
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