python包仓库:
https://www.lfd.uci.edu/~gohlke/pythonlibs

pip 镜像库 ：

-i https://pypi.tuna.tsinghua.edu.cn/simple

Chrome插件商店：
https://chrome.google.com/webstore/category/extensions?hl=zh-CN

上学吧：
https://www.shangxueba365.com/
https://www.shangxuebavip.com/

百度文库：
https://wenku.baiduvvv.com