title: How to update python 3.6 to 3.7 using Mac terminal
body: <p>OK
  I was afraid to use the terminal, so I installed the python-3.7.2-macosx10.9 package downloaded from python.org
  Ran the certificate and shell profile scripts, everything seems fine.
  Now the "which python3" has changed the path from 3.6 to the new 3.7.2</p>
  
  <p>So everything seems fine, correct?</p>
  
  <p>My question (of 2) is what's going on with the old python3.6 folder still in the applications folder. Can you just delete it safely? Why when you install a new version does it not at least ask you if you want to update or install and keep both versions?</p>
  
  <p>Second question, how would you do this from the terminal?
  I see the first step is to sudo to the root.
  I've forgotten the rest.
  But from the terminal, would this simply add the new version and leave
  the older one like the package installer?
  It's pretty simple to use the package installer and then delete a folder.</p>
  
  <p>So, thanks in advance. I'm new to python and have not much confidence 
  using the terminal and all the powerful shell commands.</p>
  
  <p>And yeah I see all the Brew enthusiasts. I DON'T want to use Brew for the moment.</p>
  
  <p>The python snakes nest of pathways is a little confusing, for the moment.
  I don't want to get lost with a zillion pathways from Brew because it's
  confusing for the moment.</p>
  
  <p>I love Brew, leave me alone.  </p>