self.rect = image.get_rect()

class SpriteSheet(object):
sprite_sheet = None
def __init__(self, file_name):
    self.sprite_sheet = pygame.image.load(file_name).convert()
def get_image(self, x, y, width, height):
    image = pygame.Surface([width, height]).convert()
    image.blit(self.sprite_sheet, (0, 0), (x, y, width, height))
    image.set_colorkey((   0,   0,   0))
    return image