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
