1.下载python最新版本
??链接：https://www.python.org/downloads/mac-osx/
安装默认位置为： /Library/Frameworks/Python.framework/Versions/3.5/
2.打开终端，修改~/.bash_profile文件
代码如下：
# Setting PATH for Python 3.6
# The original version is saved in .bash_profile.pysave
PATH="/Library/Frameworks/Python.framework/Versions/3.6/bin:${PATH}"
export PATH
alias python="/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6"
3.重启终端或执行
source ~/.bash_profile
原文：http://www.cnblogs.com/lizhipengvvip/p/7644667.html