code: def ReadPreprocessingInformation(self, knowledge_base):
      
      self._RaiseIfNotWritable()
  
      if self._storage_type != definitions.STORAGE_TYPE_SESSION:
        raise IOError('Preprocessing information not supported by storage type.')
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.
  
      Raises:
        IOError: if the storage type does not support writing preprocessing
            information or when the storage writer is closed.
        OSError: if the storage type does not support writing preprocessing
            information or when the storage writer is closed.