--- Kent Johnson <[EMAIL PROTECTED]> wrote: > Hoffmann wrote: > > Hello: > > > > I am trying to write a code (this is an exercose > from > > a book). The goal is to write a program that takes > a > > string and outputs the letters backward, ine per > > line. > > Ok. I did a test first, by writing a code with > > numbers: > > > > a=0; b=10 > > while a<=b: > > print b > > b -= 1 > > > > Here the output is: > > 10 > > 9 > > 8 > > 7 > > 6 > > 5 > > 4 > > 3 > > 2 > > 1 > > 0 > > That worked fine. > > Now, back to my exercise. I tried to write a code > that > > takes the string 'car' as the input: > > > > vehicle='car' > > index = vehicle[-1] #the last letter > > index_zero = vehicle[0] #the first letter > > > > while index >= index_zero: > > letter=vehicle[index] > > print letter > > index -= 1 > > You are confusing the index of a letter - the number > which represents > its position in the word - with the letter itself. > In your code, index > and index_zero are actually letters, not indices. > Try to rewrite the > code so they are numbers. > > > > The problem is that I get no output here. > > My guess is you got a TypeError on the line > letter=vehicle[index] > > decause index is a letter. It's important to give us > accurate > descriptions of what happens, and to show error > messages and the > tracebacks that come with them. This can be very > helpful when you have a > problem. > > Kent > > _______________________________________________
Hi Kent, Sorry for not showing the traceback the first time. Please, see it below: Traceback (most recent call last): File "<stdin>", line 2, in ? TypeError: string indices must be integers Any hint? Thanks, Hoffmann __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
