You can go to the following domestic sources to download:
Tsinghua: https://pypi.tuna.tsinghua.edu.cn/simple
Alibaba Cloud: http://mirrors.aliyun.com/pypi/simple/
University of Science and Technology of China https://pypi.mirrors.ustc.edu.cn/simple/
Huazhong University of Science and Technology: http://pypi.hustunique.com/
Shandong University of Technology: http://pypi.sdutlinux.org/
Douban: http://pypi.douban.com/simple/
The download instruction is:
pip install package-i https://pypi.tuna.tsinghua.edu.cn/simple (Note: take Tsinghua Yuan as an example)
