old_contents: #!/usr/bin/python3
  
  from itertools import chain
  import time
  import opc
  
  client = opc.Client("localhost:7891")
  if client.can_connect():
      for i in chain(range(5), range(3, -1, -1)):
          arr = [(0, 0, 0, 255)] * 5
          arr[i] = (255, 255, 255, 255)
          client.put_pixels(arr, channel=1)
          time.sleep(0.25)
  else:
      print("Can't connect to server")
  
new_contents: #!/usr/bin/python3
  
  from itertools import chain
  import time
  import opc
  
  client = opc.Client("localhost:7891")
  if client.can_connect():
      for i in chain(range(5), range(3, -1, -1)):
          arr = [(0, 0, 0, 0)] * 5
          arr[i] = (255, 255, 255, 255)
          client.put_pixels(arr, channel=1)
          time.sleep(0.25)
  else:
      print("Can't connect to server")
  
subject: Make background of scan-pixels.py transparent