def set(self):
        if sys.displayhook is not self.hook:
            self.old_hook = sys.displayhook
            sys.displayhook = self.hook
Hack sorting double chained task lists by task_id to avoid hitting
dataset/ETHPy150Open ipython/ipython-py3k/IPython/core/display_trap.py/DisplayTrap.set--crossover with--dataset/ETHPy150Open airbnb/airflow/airflow/models.py/BaseOperator.__deepcopy__