1. InvalidVersionSpecError: Invalid version spec: =2.7

anaconda 版本低导致， 下载了官网最新版本后解决。

2. anaconda SSLError(MaxRetryError(‘HTTPSConnectionPool(host=\’mirr

在命令行中输入conda config --set ssl_verify false修改设置，或者在文件~/.condarc末尾添加一行ssl_verify: false（有则修改即可）, 或将配置的源https改成http

3. jupyter连接不到内核, 后台400错误

 nginx 转发导致， 增加 web socket 支持
location  /api/kernels/ {
                proxy_pass            http://notebook;
                proxy_set_header      Host $host;                
                proxy_http_version    1.1;  # websocket support
                proxy_set_header      Upgrade "websocket";
                proxy_set_header      Connection "Upgrade";
                proxy_read_timeout    86400;
        }
        location  /terminals/ {
                proxy_pass            http://notebook;
                proxy_set_header      Host $host;                
                proxy_http_version    1.1;  # websocket support
                proxy_set_header      Upgrade "websocket";
                proxy_set_header      Connection "Upgrade";
                proxy_read_timeout    86400;
        }

4. AttributeError: type object IOLoop has no attribute initialized

conda install -c conda-forge jupyter-lsp

5. 404 GET /api/kernels/

conda install -c conda-forge ipywidgets

conda install -c conda-forge jupyter-collaboration

conda install -c anaconda pyzmq

conda update setuptools