def METHOD_NAME(self, player_sprite):
    """
    This function will move the current sprite towards whatever
    other sprite is specified as a parameter.
    We use the 'min' function here to get the sprite to line up with
    the target sprite, and not jump around if the sprite is not off
    an exact multiple of SPRITE_SPEED.
    """
    if self.center_y < player_sprite.center_y:
        self.center_y += min(SPRITE_SPEED, player_sprite.center_y - self.center_y)
    elif self.center_y > player_sprite.center_y:
        self.center_y -= min(SPRITE_SPEED, self.center_y - player_sprite.center_y)
    if self.center_x < player_sprite.center_x:
        self.center_x += min(SPRITE_SPEED, player_sprite.center_x - self.center_x)
    elif self.center_x > player_sprite.center_x:
        self.center_x -= min(SPRITE_SPEED, self.center_x - player_sprite.center_x)