code: def execute(db_name):
      
      try:
          with use_db(db_name, mode=WorkDB.Mode.open) as work_db:
              _update_progress(work_db)
              config = work_db.get_config()
              engine = get_execution_engine(config.execution_engine_name)
  
              def on_task_complete(job_id, work_result):
                  work_db.set_result(job_id, work_result)
                  _update_progress(work_db)
                  log.info("Job %s complete", job_id)
  
              log.info("Beginning execution")
              engine(
                  work_db.pending_work_items,
                  config,
                  on_task_complete=on_task_complete)
              log.info("Execution finished")
  
      except FileNotFoundError as exc:
          raise FileNotFoundError(
              str(exc).replace('Requested file', 'Corresponding database',
                               1)) from exc
docs: Execute any pending work in the database stored in `db_name`,
      recording the results.
  
      This looks for any work in `db_name` which has no results, schedules it to
      be executed, and records any results that arrive.