kaxil commented on issue #17257:
URL: https://github.com/apache/airflow/issues/17257#issuecomment-889546308
`(isinstance(current_task, SubDagOperator)` should return true if you
extend SubDagOperator, example:
```
In [1]: from airflow.operators.subdag import SubDagOperator
In [2]: class MySubDagOperator(SubDagOperator):
...: pass
...:
In [15]: isinstance(MySubDagOperator(task_id='s', subdag=DAG('ss.s',
start_date=timezone.datetime(2020, 1, 1)), dag=DAG('ss',
start_date=timezone.datetime(2020, 1, 1))), SubDagOperator)
Out[15]: True
```
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