code: def fill(self, color, start=0, end=-1):
          
          start = max(start, 0)
          if end < 0 or end >= self.numLEDs:
              end = self.numLEDs - 1
          for led in range(start, end + 1):  # since 0-index include end in range
              self._set_base(led, color)
docs: Fill the entire strip with RGB color tuple