title: Python3.6 installed but version showing as 3.5.2
body: <p>I am on an Ubuntu virtual machine and I am trying to update my version of python on the command line. I followed the instructions <a href="http://docs.python-guide.org/en/latest/starting/install3/linux/" rel="nofollow noreferrer">here</a>
  and eventually ran <code>$ sudo apt-get install python3.6</code> but when I run <code>python3 --version</code> it tells me my python version is 3.5.2</p>
  
  <p>I am following a tutorial on heroku about building a web app using python for the server side and it says I need python3.6 installed. But when I got to the step where it was really needed, I found out it wasn't actually installed.</p>
  
  <p>Any ideas?</p>