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

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