[Tutor] trouble with a small Tkinter example

[Chuck Mayers]

Hello,

I'm having trouble with this small example program:

http://en.literateprograms.org/Bresenham%27s_line_algorithm_%28Python%29

When I run it, I only get a blank grey window. I'm running Python 2.6 under
Windows XP.

If there's a problem with the code, I can't see it... it seems like it
should work. Can anyone else try this and see if it works for them?


If I stick this line in before the loop, it does draw a red line, so I know
my copy of Python/Tkinter is working:
canvas.create_line(10, 100, 5, 50 , fill='red')
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