python -m pip install jupyter contrib nbextensions

jupyter contrib nbextension install --user --skip-running-check

pip install autopep8 -i https://pypi.douban.com/simple

如果报错，就:

安装较低版本的python包

pip install -i https://pypi.douban.com/simple pyqt5==5.12.3

pip install -i https://pypi.douban.com/simple pyqtwebengine==5.12.1