title: How to close a program on a raspberry pi, in python
body: <p>What code can be used to close a program running on RPI3?</p>
  
  <p>I am running a 
  <a href="https://www.youtube.com/watch?v=fkVBAcvbrjU" rel="nofollow noreferrer">smart magic mirror</a> using my Raspberry Pi, and I want to then close it. How can I?</p>