docs: def readTupleQuotes(self, symbol, start, end):
          ''' read quotes as tuple '''
          if end is None:
              end=sys.maxint
  
          session=self.getReadSession()()
          try:
              rows=session.query(Quote).filter(and_(Quote.symbol == symbol,
                                                         Quote.time >= int(start),
                                                         Quote.time < int(end)))
          finally:
              self.getReadSession().remove()
  
          return rows