def dagbag_report(self):
        """"""
        report = textwrap.dedent("""\n
        -------------------------------------------------------------------
        DagBag loading stats for {dag_folder}
        -------------------------------------------------------------------
        Number of DAGs: {dag_num}
        Total task number: {task_num}
        DagBag parsing time: {duration}
        {table}
        """)
        stats = self.dagbag_stats
        return report.format(
            dag_folder=self.dag_folder,
            duration=sum([o.duration for o in stats]),
            dag_num=sum([o.dag_num for o in stats]),
            task_num=sum([o.task_num for o in stats]),
            table=pprinttable(stats),
        )