[Tutor] Need help understanding output...

[Alan Gauld]

"Laurens Vets" <laurens at daemon.be> wrote

> next to each other. I came up with the following (Please ignore the 
> fact that I'm trying to avoid an IndexError in a stupid way :)):

Others have answered your question.

I'll suggest that instead of using indexes its easier to just cache 
the
last two values in variables - back1 and back2 say.
initialise them to values outside the range for the first two values
then the loop body becomes (in pseudo code)

x = random number
if x == back1 == back2:   # a triple
     print 'error'
else
   back2,back1 = back1,x
   append(x)

HTH,

Alan G.