阿里云

https://mirrors.aliyun.com/pypi/simple/

pip install -i https://mirrors.aliyun.com/pypi/simple/

豆瓣

https://pypi.doubanio.com/simple/

pip install -i https://pypi.doubanio.com/simple/

清华大学

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

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