airflow/example_dags/example_setup_teardown_taskflow.py

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"""Example DAG demonstrating the usage of setup and teardown tasks."""
from __future__ import annotations

import pendulum

from airflow.decorators import setup, task, task_group, teardown
from airflow.models.dag import DAG

with DAG(
    dag_id="example_setup_teardown_taskflow",
    start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
    catchup=False,
    tags=["example"],
) as dag:
    # You can use the setup and teardown decorators to add setup and teardown tasks at the DAG level
    @setup
    @task
    def root_setup():
        print("Hello from root_setup")

    @teardown
    @task
    def root_teardown():
        print("Goodbye from root_teardown")

    @task
    def normal():
        print("I am just a normal task")

    @task_group
    def section_1():
        # You can also have setup and teardown tasks at the task group level
        @setup
        @task
        def my_setup():
            print("I set up")

        @teardown
        @task
        def my_teardown():
            print("I tear down")

        @task
        def hello():
            print("I say hello")

        my_setup()
        hello()
        my_teardown()

    root_setup()
    normal() >> section_1()
    root_teardown()