1. Open cmd, enter any one of the following four items, and recommend domestic mirroring
pip install numpy # 默认从https://pypi.org/simple 下载
pip install numpy -i https://pypi.tuna.tsinghua.edu.cn/simple/ # 从清华大学资源站点下载
pip install numpy -i https://mirrors.aliyun.com/pypi/simple/ # 从阿里云资源站点下载
pip install numpy -i https://pypi.mirrors.ustc.edu.cn/simple/ # 从中科大资源站点下载2. Install Matplotlib on Aliyun mirror
pip install -i https://mirrors.aliyun.com/pypi/simple/ matplotlib