Preparando contenedores de la clase Gato

#Preparando contenedores e imágenes de Gato...
import pygame
from pygame.locals import *

class Gato(pygame.sprite.Sprite):
    speed = 5
    bounce = 24
    images = []
    def __init__(self):
        pygame.sprite.Sprite.__init__(self,self.containers)
        self.image=self.images[0]
        self.rect = self.image.get_rect()

    def inf(self):
        print self.speed
        print self.bounce
        print self.images
def main():
   
    all = pygame.sprite.RenderUpdates()
    Gato.containers = all      
    gato = Gato()
    gato.inf()

if __name__=='__main__': main()