Use multiple versions of python environment with pyenv

$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo apt-get install git gcc make openssl libssl-dev libbz2-dev libreadline-dev libsqlite3-dev

$ cd /usr/local/
$ sudo git clone git://github.com/yyuu/pyenv.git ./pyenv
$ sudo mkdir -p ./pyenv/versions ./pyenv/shims
$ cd /usr/local/pyenv/plugins/

$ sudo git clone git://github.com/yyuu/pyenv-virtualenv.git
$ echo 'export PYENV_ROOT="/usr/local/pyenv"' | sudo tee -a /etc/profile.d/pyenv.sh
$ echo 'export PATH="${PYENV_ROOT}/shims:${PYENV_ROOT}/bin:${PATH}"' | sudo tee -a /etc/profile.d/pyenv.sh
$ source /etc/profile.d/pyenv.sh
$ pyenv --version

sudo vi /etc/sudoers
    #Defaults    secure_path = /sbin:/bin:/usr/sbin:/usr/bin
    Defaults    env_keep += "PATH"
    Defaults    env_keep += "PYENV_ROOT"

$ pyenv install --list  ###Check the installable version
$ sudo pyenv install -v 2.7.13
$ sudo pyenv install -v 3.6.1

$ python --version
Python 2.7.6
$ pyenv versions
* system (set by /usr/local/pyenv/version)
  2.7.13
  3.6.1
$ sudo pyenv global 2.7.13
$ python --version
Python 2.7.13
$ pyenv versions
  system
* 2.7.13 (set by /usr/local/pyenv/version)
  3.6.1

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