How to pass parameter to PythonOperator in Airflow

问题

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

t5_send_notification = PythonOperator(
    task_id='t5_send_notification',
    provide_context=True,
    python_callable=SendEmail,
    op_kwargs=None,
    #op_kwargs=(key1='value1', key2='value2'),
    dag=dag,
)

def SendEmail(**kwargs):
    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()

I would like to be able to pass some parameters into the t5_send_notification's callable which is SendEmail, ideally I want to attach the full log and/or part of the log (which is essentially from the kwargs) to the email to be sent out, guessing the t5_send_notification is the place to gather those information.

Thank you very much.

回答1:

Pass a dict object to op_kwargs

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,
)

回答2:

This should work:

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

来源：https://stackoverflow.com/questions/54894418/how-to-pass-parameter-to-pythonoperator-in-airflow

标签

python

airflow