Airflow Python operator passing parameters

Question

I'm trying to write a Python operator in an airflow DAG and pass certain parameters to the Python callable.

My code looks like below.

def my_sleeping_function(threshold):
   print(threshold)

fmfdependency = PythonOperator(
   task_id='poke_check',
   python_callable=my_sleeping_function,
   provide_context=True,
   op_kwargs={'threshold': 100},
   dag=dag)

end = BatchEndOperator(
   queue=QUEUE,
   dag=dag)

start.set_downstream(fmfdependency)
fmfdependency.set_downstream(end)

But I keep getting the below error.

TypeError: my_sleeping_function() got an unexpected keyword argument 'dag_run'

Not able to figure out why.

Answer 1

Add **kwargs to your operator parameters list after your threshold param

Answer 2

This is how you can pass arguments for a Python operator in Airflow.

from airflow import DAG
from airflow.operators.dummy_operator import DummyOperator
from airflow.operators.python_operator import PythonOperator

from time import sleep
from datetime import datetime

def my_func(*op_args):
        print(op_args)
        return op_args[0]

with DAG('python_dag', description='Python DAG', schedule_interval='*/5 * * * *', start_date=datetime(2018, 11, 1), catchup=False) as dag:
        dummy_task      = DummyOperator(task_id='dummy_task', retries=3)
        python_task     = PythonOperator(task_id='python_task', python_callable=my_func, op_args=['one', 'two', 'three'])

        dummy_task >> python_task