code: def _extendrange(self, start, end):
          
          range_positions = []
          for i in range(start, end):
              if i != 0:
                  range_positions.append(str(i))
              if i < end:
                  range_positions.append(self.separator)
          return range_positions
docs: Creates list of values in a range with output delimiters.
  
          Arguments:
              start -     range start
              end -       range end