def swap_left(self):
        i = self.index
        j = (self.index - 1) % self.num_tiles
        self.tiles[i], self.tiles[j] = self.tiles[j], self.tiles[i]
Swap the two left tiles.
dataset/ETHPy150Open ardekantur/pyglet/examples/apple_remote_demo.py/Carousel.swap_left