def __init__(self,imgnum):
        pygame.sprite.Sprite.__init__(self)
        num = str(imgnum)
        self.image = pygame.image.load("C:\Python27\Programs\CalculatorProgram\CalcGraphics\k"+(num)+".png").convert_alpha()
        self.rect = self.image.get_rect()
        self.rect.center = (100, 300)