code: def next(self):
      
      self._has_iterated = True
  
      if self._read_before_start:
        self._blob_reader.readline()
        self._read_before_start = False
      start_position = self._blob_reader.tell()
  
      if start_position > self._end_position:
        raise StopIteration()
  
      line = self._blob_reader.readline()
  
      if not line:
        raise StopIteration()
  
      return start_position, line.rstrip("\n")
docs: Returns the next input from as an (offset, line) tuple.