title: How to upgrade Python version to 3.7?
body: <p>I have python3.5 already in linux ubuntu. I have downloaded the python3.7.tar <a href="http://www.python.org" rel="noreferrer">www.python.org</a>.</p>
  
  <p>But i have no idea how to install it. How to upgrade to python 3.7? Thanks.</p>