code: def irange(self, start=0, end=-1, callback=None, withscores=True,
                 **options):
          '''Return the range by rank between start and end.'''
          backend = self.read_backend
          res = backend.structure(self).irange(start, end,
                                               withscores=withscores,
                                               **options)
          if not callback:
              callback = self.load_data if withscores else self.load_values
          return backend.execute(res, callbackf irange(self, start=0, end=-1, callback=None, withscores=True,
                 **options):
          '''Return the range by rank between start and end.'''
          backend = self.read_backend
          res = backend.structure(self).irange(start, end,
                                               withscores=withscores,
                                               **options)
          if not callback:
              callback = self.load_data if withscores else self.load_values
          return backend.execute(res, callback)
docs: Return the range by rank between start and end.