Why duplicate a variable??

[Morgaccio]

Hi, everybody.

Why do I have to duplicate the variable 'k' in the code below?
I tried NOT doing it, but the counter doesn't work properly unless I create the variable 'counter' to receive 'k'.
(The script is supposed to receive the inputs 'initial number', 'final number', 'step' and then print the whole progression).

Thanks in advance!

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def counter(k, y, z):     from time import sleep     if z < 0:         z *= -z       if k < y:         count = k  ## WHY?? WHEN I IGNORE THIS AND USE K ALONG THE LOOP, IT USES AN EXTRA (WRONG) VALUE IN THE END.         while cont <= y:             print(f'{count}', end=' - ' if count+z <= y else '')             count += z             sleep(0.333)       while k >= y:         print(k, end=' - ' if k-z >= y else '')         k -= z         sleep(0.333)   while True:     start = int(input('Initial number: '))     end = int(input('Final number: '))     step = int(input('Step: '))       counter(start, end, step)       flag = str(input('\nAgain? (S/N) ')).strip().lower()[0]     if flag == 'n':         break

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Well, since I can't edit/delete my post, there goes the code again, now revised...

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# encoding:utf-8   def counter(k, y, z):     from time import sleep     if z < 0:         z *= -z       if k < y:         count = k  ## WHY DOESN'T IT WORK IF A SIMPLY USE K??         while count <= y:             print(count, end=' - ' if count+z <= y else '')             count += z             sleep(0.333)       while k >= y:         print(k, end=' - ' if k-z >= y else '')         k -= z         sleep(0.333)   while True:     initial = int(input('Initial number: '))     final = int(input('Final number: '))     step = int(input('Step: '))       counter(initial, final, step)       flag = str(input('\nAgain? (Y/N) ')).strip().lower()[0]     if flag == 'n':         break

[ichabod801]

You need the original value of k on line 15. You shouldn't need it if you use an else:

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if k < y:     while k <= y:         print(k, end=' - ' if count+z <= y else '')         k += z         sleep(0.333)  else:     while k >= y:         print(k, end=' - ' if k-z >= y else '')         k -= z         sleep(0.333)

(untested)

[ThomasL]

Are you sure your line 6: z *= -z is what you want to do?