code: def ReadPreprocessingInformation(self, knowledge_base):
      
      generator = self._GetAttributeContainers(
          self._CONTAINER_TYPE_SYSTEM_CONFIGURATION)
      for stream_number, system_configuration in enumerate(generator):
        # TODO: replace stream_number by session_identifier.
        knowledge_base.ReadSystemConfigurationArtifact(
            system_configuration, session_identifier=stream_number)
docs: Reads preprocessing information.
  
      The preprocessing information contains the system configuration which
      contains information about various system specific configuration data,
      for example the user accounts.
  
      Args:
        knowledge_base (KnowledgeBase): is used to store the preprocessing
            information.