def key(self):
        """
        Returns a tuple that identifies the task instance uniquely
        """
        return self.dag_id, self.task_id, self.execution_date, self.try_number
def key(self):
        
        return self.dag_id, self.task_id, self.execution_date, self.try_number
def key ( self ) : return self . dag_id , self . task_id , self . execution_date , self . try_number
Returns a tuple that identifies the task instance uniquely
Returns a tuple that identifies the task instance uniquely