class Robot(pygame.sprite.Sprite):
    def __init__(self, image, position):
        pygame.sprite.Sprite.__init__(self)
        self.src_image = pygame.image.load(image)
        self.position = position
        self.xinc = self.yinc = 0
    def update(self, deltat):
        x, y = self.position
        x += self.xinc
        y += self.yinc
        self.position = (x,y)
        self.image = self.src_image
        self.rect = self.image.get_rect()
        self.rect.center = self.position


class Box(pygame.sprite.Sprite):
    def __init__(self, image, position):
        pygame.sprite.Sprite.__init__(self)
        self.src_image = pygame.image.load(image)
        self.position = position
    def update(self, newimage):
        x, y = self.position
        self.position = (x,y)
        self.image = self.src_image
        self.rect = self.image.get_rect()
        self.rect.center = self.position
        if pygame.sprite.collide_rect(robot, self):
            self.src_image = pygame.image.load(newimage)



rect = screen.get_rect()

robot = Robot("Robot.GIF", (0,0))
for i in range(1, 11):
    box + i = Box("closed.GIF", (10*i, 10*i))