python.algorithms.scheduler.Scheduler Node1 python.algorithms.scheduler. Scheduler + sequence + ordered_preprocessors + ordered_event_generators + ordered_postprocessors + preprocessor_fn_dict + generator_fn_dict + postprocessor_fn_dict + __init__() + add() + print_structure() + run_preprocessors() + run_generators() + run_postprocessors() Node2 object Node2->Node1 Node3 string Node3->Node1 +powheg_LHE_output