The code was filled with two key variables: t_1 and t_l. Printing out the source in a Courier font made these two vars completely indistinguishable,
Are you sure it was Courier? I'm looking at it now in Courier, and they are different, although very similar.
-- Greg Ewing, Computer Science Dept, University of Canterbury, Christchurch, New Zealand http://www.cosc.canterbury.ac.nz/~greg -- http://mail.python.org/mailman/listinfo/python-list
