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The loop function is similar to range(), but handles the parameters somewhat differently: it takes in 3 parameters: the starting point, the stopping point, and the increment step. When the starting point is greater than the stopping point, it forces the steps to be negative. When, instead, the starting point is less than the stopping point, it forces the step to be positive. Also, if the step is 0, it changes to 1 or -1. The result is returned as a one-line, space-separated string of numbers.

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abdullahfarooqi

Answer and Explanation:

def loop(start, stop, step):

   return_string = ""

   if step == 0:

       step = 1

   if start > stop:  # the bug was here, fixed it

       step = abs(step) * -1

   else:

       step = abs(step)

   for count in range(start, stop, step):

       return_string += str(count) + " "

   return return_string.strip()

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