工具包已经下载但是安装时出现“Jupyter command jupyter-contrib not found.”
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