Tkinter from Vis. BASIC

[Terrance N. Phillip]

In VB, an easy way I indicate progress is something like
do while <some process is not met>
lblNotify.foreg round = randomcolor
lblNotify.refre sh <-----------
<sleep>
loop

I want to do the same thing in Python/Tkinter:

# Wait for network to recognize the workstation:
while os.system("slis t") != 0:
self.notify["fg"] = randcolor()
# how do I refresh label l3 at this point?
time.sleep(3)

I've tried self.notify.gri d() (I'm using the grid geometry manager
throughout), but that didn't work, and there is no redraw() or refresh()
method that I can see.