title: Downloaded Python 3.6 but terminal is still saying I'm using python 2.7.12
body: <p>I have looked for Python 2.7.12 in my apps and docs but I can't find it... 
  I'm using a macbook pro.<br>
  I can see Python 3.6 in my applications so I don't know why the terminal isn't referring to this one.  </p>
  
  <p>I want to get started learning django but I don't think it will be possible if I don't use Python 3.5 or later.  </p>
  
  <p>is there a way to tell the terminal to use 3.6 instead?</p>