code: def iterRecords(self):
          
          if self.numRecords is None:
              self.__dbfHeader()
          f = self.__getFileObj(self.dbf)
          f.seek(self.__dbfHdrLength)
          for i in xrange(self.numRecords):
              r = self.__record()
              if r:
                  yield r
docs: Serves up records in a dbf file as an iterator.
          Useful for large shapefiles or dbf files.