jupyter notebook安装插件，代码自动补全

1. 首先安装nbextensions，在命令行环境中输入

pip install jupyter_contrib_nbextensions -i https://pypi.mirrors.ustc.edu.cn/simple
jupyter contrib nbextension install --user

2. 安装nbextensions_configurator，在命令行环境中输入

pip install --user jupyter_nbextensions_configurator 
jupyter nbextensions_configurator enable --user

但是在安装完成之后，重新运行jupiter notebook，并没有出现nbextension插件，报错显示：

[W 21:01:51.399 NotebookApp] 加载插件 jupyter_nbextensions_configurator 失败
   Traceback (most recent call last):
     File "/home/vc/.local/lib/python3.5/site-packages/notebook/notebookapp.py", line 1572, in init_server_extensions
       mod = importlib.import_module(modulename)
     File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
       return _bootstrap._gcd_import(name[level:], package, level)
     File "", line 986, in _gcd_import
     File "", line 969, in _find_and_load
     File "", line 956, in _find_and_load_unlocked
   ImportError: No module named 'jupyter_nbextensions_configurator'

使用命令pip list确实已经安装了jupyter-contrib-nbextensions和jupyter-nbextensions-configurator，根据博客 https://blog.csdn.net/Fire_to_cheat_/article/details/84938975 所述，输入命令：

python -m pip install --user jupyter_contrib_nbextensions

重启jupyter notebook，还是没有显示，由于我的笔记本同时装了python2.7和python3.5，所以应该针对python3.5也执行命令：

python3.5 -m pip install --user jupyter_contrib_nbextensions

重新运行jupyter notebook就可以了，这下就可以自动补全了，一下子方便了许多。