python：https://www.python.org/downloads/ pip：https://pip.pypa.io/en/stable/installing/#upgrading-pip pip is already installed if you are using Python 2 =2.7.9 or Python 3 =3.4 downloaded from python.org 但 macox 上安装的py3.7 只有
python：https://www.python.org/downloads/
pip：https://pip.pypa.io/en/stable/installing/#upgrading-pip
pip is already installed if you are using Python 2 >=2.7.9 or Python 3 >=3.4 downloaded from python.org
但 macox 上安装的py3.7 只有 pip3 命令，不管你本地有没有，先升级 pip。
$ pip3 -V && pip3 install -U pip && pip -V
numpy：pip install numpy -i https://pypi.tuna.tsinghua.edu.cn/simple
设置永久镜像源：mkdir ~/.pip && vi ~/.pip/pip.conf
[global] index-url=https://pypi.tuna.tsinghua.edu.cn/simple [install] trusted-host=pypi.tuna.tsinghua.edu.cn
Link: https://www.cnblogs.com/farwish/p/10823100.html