Homebrew是Mac平台下强大的包管理工具，执行如下命令，即可安装Homebrew。
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
ljw@ljdeMacBook-Pro ~ % ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" Warning: The Ruby Homebrew installer is now deprecated and has been rewritten in Bash. Please migrate to the following command: /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
brew 镜像安装脚本（亲测最快速最有效）
/usr/bin/ruby -e "$(curl -fsSL https://cdn.jsdelivr.net/gh/ineo6/homebrew-install/install)"
ljw@ljdeMacBook-Pro ~ % /usr/bin/ruby -e "$(curl -fsSL https://cdn.jsdelivr.net/gh/ineo6/homebrew-install/install)" Warning: Ruby版本Homebrew安装脚本已被废弃，新版脚本使用Bash重写。 请使用以下命令: /bin/bash -c "$(curl -fsSL https://cdn.jsdelivr.net/gh/ineo6/homebrew-install/install.sh)"
引用:Mac安装Homebrew的正确姿势
安装前先搜索一下是否已经存在python3的包：
brew search python3
使用brew命令安装Python 3和pip 3
brew install python3
Anaconda安装
Anaconda的官方下载链接为https://www.continuum.io/downloads，选择Python 3版本的安装包下载即可，如图1-1所示。
如果下载速度过慢，可以选择使用清华大学镜像，下载列表链接为https://mirrors.tuna.tsinghua.edu.cn/anaconda/archive/
