Appropriately delay this PyGame code

[kleynah22]

I am a beginner to programming but have been interested in mazes, and I was trying to run this program :
http://thelinuxchronicles.blogspot.in/20...ution.html

But, the output comes all at once, and I want to slow it down so that one can actually see the red line painting the path slowly.

I've tried adding a sleep() delay in the elif and if cases, and i expected it to slow it down, but it just slows down the appearance of the line(it still appears all at once). Where do I have to put it?Thank you.

 56 # paints the solution path in the maze window
 57 def maze_path_window(m,w):
 58   path = m.solutionpath
 59 
 60   # print every cell within the solution path
 61   for index in range(len(path)-1):
 62     actrow = path[index][0]
 63     actcol = path[index][1]
 64     nextrow = path[index+1][0]
 65     nextcol = path[index+1][1]
 66     pygame.draw.rect(w,RED,(actcol*CELLSIZE+(actcol+1)*WALLSIZE,actrow*CELLSIZE+(actrow+
 67     1)*WALLSIZE,CELLSIZE,CELLSIZE))
 68 
 69     # also paint the white spaces between the cells
 70     if actrow == nextrow:
 71       if actcol < nextcol:
 72         pygame.draw.rect(w,RED,((actcol+1)*CELLSIZE+(actcol+1)*WALLSIZE,actrow*CELLSIZE+
 73         (actrow+1)*WALLSIZE,WALLSIZE,CELLSIZE))
 74       else:
 75         pygame.draw.rect(w,RED,(actcol*CELLSIZE+actcol*WALLSIZE,actrow*CELLSIZE+(actrow+
 76         1)*WALLSIZE,WALLSIZE,CELLSIZE))
 77     elif actcol == nextcol:
 78       if actrow < nextrow:
 79         pygame.draw.rect(w,RED,(actcol*CELLSIZE+(actcol+1)*WALLSIZE,(actrow+1)*CELLSIZE+
 80         (actrow+1)*WALLSIZE,CELLSIZE,WALLSIZE))
 81       else:
 82         pygame.draw.rect(w,RED,(actcol*CELLSIZE+(actcol+1)*WALLSIZE,actrow*CELLSIZE+
 83         actrow*WALLSIZE,CELLSIZE,WALLSIZE))

[ineedastupidusername]

I can't copy paste that without pasting all the left column numbers too. plus it doesn't look like the full program, so the gist should be this:
you can draw whatever you want to the screen, but the update is only visible to viewer when you call pygame.display.flip()
So instead of:
draw whole maze, then flip.
draw a piece of the maze then flip. also put a time.sleep(0.1) after the flip or it will be too fast to see. (import time at top)

[Windspar]

1. You can't use range or any loops. The event loop is your loop.
Never use time.sleep. time.sleep is stop the world.

2. use pygame.time.get_ticks or timers 
make variables current_tick , next_tick

current_tick = 0
next_tick = 0

#event_loop
# some other stuff
current_tick = pygame.time.get_ticks()
if current_tick > next_tick:
    next_tick += 200 # interval
    # do something