new_contents: ##
  ##  PyGlow
  ##
  ##      python module to control Pimoronis PyGlow (http://shop.pimoroni.com/products/pyglow)
  ##
  ##      * set_leds.py - how to control a individual set of leds by Ben (@ben_leb)
  ##
  
  from pyglow import PyGlow
  from time import sleep
  
  pyglow = PyGlow()
  
  try:
  
      while True:
  
          ## choose a set of leds
          leds = [1,3,5,11,13,15]
          ## save them with the brightness you want
          pyglow.set_leds(leds,50)
          ## wait to demonstrate...
          sleep(3)
          ## light up the leds!
          pyglow.update_leds()
  
          sleep(3)
  
          ## now we want to shut down the first set
          pyglow.set_leds(leds,0)
          ## ...build a newer, brighter set
          leds = [2,4,9]
          pyglow.set_leds(leds,150)
          ## and update the leds!
          pyglow.update_leds()
  
  except KeyboardInterrupt:
  
      pyglow.all(0)
  
subject: add example to show how set_leds & update_leds work