python: pyenv, virtualenv, auto in mac os

Install pyenv

• using brew

brew install pyenv

# using your own profile
# use ~/.bashrc or ~/.bash_profile
# ~/.zshrc when using zsh
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile
echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bash_profile
echo 'eval "$(pyenv init -)"' >> ~/.bash_profile
source ~/.bash_profile

Install virtualenv

• using brew

brew install pyenv-virtualenv

echo 'eval "$(pyenv virtualenv-init -)"' >> ~/.bash_profile

Install autoenv

• using brew

brew install autoenv

To finish the installation, source activate.sh in your shell:
  source /usr/local/opt/autoenv/activate.sh

# add path for about after source
echo 'source /usr/local/opt/autoenv/activate.sh' >> ~/.bash_profile