Not understanding this documentation

[F.O.P.]

http://bugs.python.org/issue5358
I simply installed 3.0 on my ubuntubox brought my project from a
windows machine and made necessary changes to what I had used from os
and os.path.  I have an error at the end of this line:
for k in range(I):
and the error:
SyntaxError: invalid character in identifier

I've already declared I way above as the lenth of an array (I = len
(IA))
There shouldn't be a problem there aren't any issues with other
declarations identical to this.