I am the light!!!!
useful modules:
http://coolwanglu.github.io/pdf2htmlEX/
https://github.com/mstamy2/PyPDF3
https://github.com/requests/requests
example program:
https://github.com/zhuzhenpeng/PdfKit merging pdf, maybe we don't need it
https://github.com/mHasanMalik/Gce-Guide-Pdf-Downloader
git guide: https://guides.github.com/introduction/git-handbook/
pastpaper of cs:https://pan.baidu.com/s/1ZUF1bggnat6RS4mUZf3Lgg
too large to upload
to download html format's paper: http://www.theradianced.xyz/html.zip