code: def StoreAttribute(self, string='', **unused_kwargs):
      
      logging.debug('Storing attribute {0:s}'.format(repr(string)))
  
      # TODO: Update the expected number_of_args
      try:
        self.current_expression.SetAttribute(string)
      except AttributeError:
        raise errors.ParseError('Invalid attribute \'{0:s}\''.format(string))
  
      return 'OPERATOR'
docs: Store the attribute.