mac os 安装brew 通过brew安装python3

1.mac os 安装brew

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

brew -v
Homebrew 1.6.9
Homebrew/homebrew-core (git revision afcb; last commit 2018-07-05)

2.brew 安装软件

brew search python3
brew install python3

参考：
0.Homebrew官网安装教程
1.mac安装brew 软件包管理工具Homebrew
2.Homebrew帮助文档