LED color cycling

def cycleLights(self):

                t = threading.currentThread()

                head  = 0               # Index of first 'on' pixel

                tail  = -10             # Index of last 'off' pixel

                color = 0xFF0000        # 'On' color (starts red)

                while getattr(t, "do_run", True):

                        self.strip.setPixelColor(head, color) # Turn on 'head' pixel

                        self.strip.setPixelColor(tail, 0)     # Turn off 'tail'

                        self.strip.show()                     # Refresh strip

                        time.sleep(1.0 / 80)             # Pause 20 milliseconds (~50 fps)

                        head += 1                        # Advance head position

                        if(head >= self.numpixels):           # Off end of strip?

                                head    = 0              # Reset to start

                                color >>= 1              # Red->green->blue->black

                                if(color == 0): color = 0xFF0000 # If black, reset to red

                        tail += 1                        # Advance tail position

                        if(tail >= self.numpixels): tail = 0  # Off end? Reset