解决Jupyter command `jupyter-contrib` not found. 问题，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

原文链接:https://blog.csdn.net/duqiumail/article/details/107650058