code: def initializes_simulants(self, initializer: Callable[[SimulantData], None],
                                creates_columns: Sequence[str]=(),
                                requires_columns: Sequence[str]=()):
          
          self._population_manager.register_simulant_initializer(initializer, creates_columns, requires_columns)
docs: Marks a callable as a source of initial state information for new simulants.
  
          Parameters
          ----------
          initializer :
              A callable that adds or updates initial state information about new simulants.
          creates_columns :
              A list of the state table columns that the given initializer provides the initial state information for.
          requires_columns :
              A list of the state table columns that already need to be present and populated
              in the state table before the provided initializer is called.