How to pass parameter to PythonOperator in Airflow

Question

I just started using Airflow, can anyone enlighten me how to pass a parameter into PythonOperator like below:

t5_send_notif         


        

Answer 1

1. Pass a dict object to op_kwargs

2. Use the keys to access their value from kwargs dict in your python callable

   def SendEmail(**kwargs):
       print(kwargs['key1'])
       print(kwargs['key2'])
       msg = MIMEText("The pipeline for client1 is completed, please check.")
       msg['Subject'] = "xxxx"
       msg['From'] = "xxxx"
       ......
       s = smtplib.SMTP('localhost')
       s.send_message(msg)
       s.quit()
   
   
   t5_send_notification = PythonOperator(
       task_id='t5_send_notification',
       provide_context=True,
       python_callable=SendEmail,
       op_kwargs={'key1': 'value1', 'key2': 'value2'},
       dag=dag,
   )
   

Answer 2

PythonOperator have a named parameter op_kwargs and accepts dict object.

have

t5_send_notification = PythonOperator(
    task_id='t5_send_notification',
    provide_context=True,
    python_callable=SendEmail,
    op_kwargs={"my_param":'value1'},
    dag=dag,
)

def SendEmail(my_param,**kwargs):
    print(my_param) #'value_1'
    msg = MIMEText("The pipeline for client1 is completed, please check.")
    msg['Subject'] = "xxxx"
    msg['From'] = "xxxx"
    ......
    s = smtplib.SMTP('localhost')
    s.send_me