code: def fetch_next_block(self):
          
          
          results = []
          for _ in xrange(self._page_size):
              try:
                  results.append(next(self))
              except StopIteration:
                  # no more results
                  break
          return results
docs: Returns a block of results. 
          
          This method only exists for backward compatibility reasons. (Because QueryIterable
          has exposed fetch_next_block api).
          
          This method internally invokes next() as many times required to collect the 
          requested fetch size.
          
          :return:
              List of results.
          :rtype: list