ubuntu unattended upgrade connfig code example

Example 1: how to uninstall python2.7 from ubuntu 18.04

whereis python
which python

Example 2: how to upgrade python from 2.7 to 2.9 on ubuntu 14.04

git clone https://github.com/pyenv/pyenv.git ~/.pyenv
 git clone https://github.com/pyenv/pyenv-virtualenv.git ~/.pyenv/plugins/pyenv-virtualenv