xcode-select --install
brew install pyenv
export PATH=$(pyenv root)/shims:$HOME/bin:/usr/local/bin:$PATH
pyenv install 3.5.2
pyenv versions
pyenv global 3.5.2
pyenv commands
pyenv local
pyenv global
pyenv shell
pyenv install
pyenv uninstall
pyenv rehash
pyenv version
pyenv versions
pyenv which
pyenv whence