[英]how to pick the return value from previous task of python operator in airflow
在嘗試將 python 運算符的任務的 output 捕獲到變量中時出現錯誤。 任何建議請
with DAG(
dag_id="test_dag",
start_date=datetime(2022, 1, 24),
schedule_interval=None,
render_template_as_native_obj=True,
default_args={},
params={
"param2": "arya2@gmail.com",
"sourcedir": ['/home/arya/'],
"timenum": 0
},
catchup=False
) as dag:
pythondefination = PythonOperator(
task_id=f"pythondefinationfunc",
python_callable=pythondefination,
provide_context=True
)
def valuecapture(**kwargs):
ti = kwargs['ti']
timeinfo = ti.xcom_pull(task_ids='pythondefinationfunc')
return timeinfo
**Error: KeyError: 'ti'
要訪問上一個任務的返回值,您可以從 xcom 讀取它,但讀取應該在 airflow 運算符中,以便訪問運行上下文:
bash_task = BashOperator(
task_id="read_python_func_return_value",
bash_command="echo {{ti.xcom_pull(task_ids='pythondefinationfunc')}}",
)
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