> Hi John, > > We are almost there. I changed the code and, at least, > I got the correct output. However, I also got a > traceback. I didn't understand the traceback. Could > you clarify that? > Thanks, > Hoffmann > ps: The new code: > > >>> vehicle='car' > >>> index = -1 #index of the last letter > >>> lenght = len(vehicle) > >>> last = vehicle[lenght-1] > >>> > >>> while last >= vehicle[0]: > letter=vehicle[index] > print letter > index -= 1 > > > r > a > c > > Traceback (most recent call last): > File "<pyshell#40>", line 2, in -toplevel- > letter=vehicle[index] > IndexError: string index out of range
while last >= vehicle[0]: The problem is is that neither vehicle[0] nor last change during the loop so it is always satisified and index eventually becomes a number that doesn't correspond to an index of the string. I would suggest something along these lines instead: for i in range(len(vehicle)-1, -1, -1): print vehicle[i] which is basically what my list comp did but printing out the letters rather than returning a list _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor