1.
brew install python
2.If you don‘t have ~/.bash_profile, add ~/.bash_profile by
touch ~/.bash_profile
3.Add below text to ~/.bash_profile
# Homebrew
export PATH=/usr/local/bin:$PATH
4.
source ~/.bash_profile
5.test
which python
/usr/local/bin/python
原文：http://www.cnblogs.com/huangshiyu13/p/5764403.html