python memo

 1 #安装
 2 打开Anaconda Prompt窗口，执行第一个命令，用于安装nbextensions：
 3 pip install jupyter_contrib_nbextensions
 4 再执行第二个命令，用于安装 javascript and css files
 5 jupyter contrib nbextension install --user
 6 最后执行，用于安装configurator
 7 pip install jupyter_nbextensions_configurator
 8 
 9 #卸载
10 pip uninstall jupyter_contrib_nbextensions
11 pip uninstall jupyter_nbextensions_configurator