code: def clear(self, *args):
          
  
          black = (0, 0, 0)  # default
  
          if len(args) == 0:
              colour = black
          elif len(args) == 1:
              colour = args[0]
          elif len(args) == 3:
              colour = args
          else:
              raise ValueError('Pixel arguments must be given as (r, g, b) or r, g, b')
  
          self.set_pixels([colour] * 64)
docs: Clears the LED matrix with a single colour, default is black / off
  
          e.g. ap.clear()
          or
          ap.clear(r, g, b)
          or
          colour = (r, g, b)
          ap.clear(colour)