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 _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
