1、在后面加-i https://mirrors.aliyun.com//pypi//simple或https://pypi.tuna.tsinghua.edu.cn/simple
pip install numpy -i https://mirrors.aliyun.com//pypi//simple
pip install numpy==1.21.0 -i https://pypi.tuna.tsinghua.edu.cn/sim
1、在后面加-i https://mirrors.aliyun.com//pypi//simple或https://pypi.tuna.tsinghua.edu.cn/simple
pip install numpy -i https://mirrors.aliyun.com//pypi//simple
pip install numpy==1.21.0 -i https://pypi.tuna.tsinghua.edu.cn/sim