清华：https://pypi.tuna.tsinghua.edu.cn/simple
阿里云：http://mirrors.aliyun.com/pypi/simple/
中国科技大学 https://pypi.mirrors.ustc.edu.cn/simple/
华中理工大学：http://pypi.hustunique.com/
山东理工大学：http://pypi.sdutlinux.org/
豆瓣：http://pypi.douban.com/simple/
temporary use:
可以在使用pip的时候加参数-i https://pypi.tuna.tsinghua.edu.cn/simple
例如：pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pyspider，这样就会从清华这边的镜像去安装pyspider库。
Modified forever, once and for all
Linux
Under Linux, modify ~/.pip/pip.conf (create a folder and file if you don’t have it. Add "." to the folder to indicate a hidden folder)
[global] index-url = https://pypi.tuna.tsinghua.edu.cn/simple [install] trusted-host=mirrors.aliyun.com
windows
Under windows, create a pip directory in the user directory, such as C:\Users\xx\pip, and create a new file pip.ini. The content is the same as above.