1.先卸载：
分别用cmd命令，卸载之前的安装
pip uninstall jupyter_contrib_nbextensions
pip uninstall jupyter_nbextensions_configurator
2.重新下载并安装：
2.1 先cmd命令安装
pip install -i http://pypi.douban.com/simple –trusted-host pypi.douban.com jupyter_contrib_nbextensions
2.2 然后cmd进入目录
C:\Users\he\Python\Python38\Lib\site-packages\jupyter_contrib_nbextensions
2.3 cmd执行下面命令手动安装
python application.py install
2.4 然后安装
jupyter contrib-nbextension install –user
这时就不会
提示
“Jupyter command
jupyter-contrib
not found.”这个问题了
3 接下来继续安装
pip install -i http://pypi.douban.com/simple –trusted-host pypi.douban.com jupyter_nbextensions_configurator
jupyter nbextensions_configurator enable –user
这时从新启动jupyter
notebook
就成功看到工具Nbextensions在工具栏了
本文地址：https://blog.csdn.net/duqiumail/article/details/107650058