Mine

import os,sys
import pygame
from grid import *
from pygame.locals import *

maze = [[1,0,0],[0,1,0],[0,0,1]]
n=len(maze)
pixels = 800/n


grid = Grid((pixels,pixels), (n,n), "Generated Maze")

blackBlock = pygame.Surface( (pixels, pixels) )
whiteBlock = pygame.Surface( (pixels, pixels) )

while True:
    for event in pygame.event.get():
        if event.type == QUIT or (event.type == KEYDOWN and event.key==K_ESCAPE):
            pygame.quit()
            sys.exit()
    for row in xrange(grid.grid_size[1]):
        for col in xrange(grid.grid_size[0]):
            pos = col,row
            if maze[pos]:
                grid.screen.blit(blackSurface, (col*grid.block_size[0], row*grid.block_size[1]))
            else:
                grid.screen.blit(whiteSurface, (col*grid.block_size[0], row*grid.block_size[1]))