Downloading PIP package is too slow

Domestic mirror sites can be used , I have used Qinghua and Douban , They are used as follows:

1. pip install package -i https://tuna.tsinghua.edu.cn/simple

2. pip install package -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

Personal experience is that Douban is more stable than the mirror point of Tsinghua .