brew update
brew install pyenv-virtualenv
echo 'export PYENV_ROOT="${HOME}/.pyenv"' >> ~/.bash_profile
echo 'export PATH="${PYENV_ROOT}/bin:$PATH"' >> ~/.bash_profile
echo 'eval "$(pyenv init -)"' >> ~/.bash_profile
echo 'eval "$(pyenv virtualenv-init -)"' >> ~/.bash_profile
source ~/.bash_profile
pyenv install 2.7.14
pyenv global 2.7.14
参考
http://qiita.com/jjongs08/items/521eddea150795749711
http://qiita.com/its/items/24f8b20aa2106819dfb3