code: def ReadLine(self, file_object):
      
      line, _, self.lines = self.lines.partition('\n')
      if not line:
        self.ReadLines(file_object)
        line, _, self.lines = self.lines.partition('\n')
  
      return line
docs: Reads a line.
  
      Args:
        file_object (dfvfs.FileIO): file-like object.
  
      Returns:
        str: line read from the lines buffer.