Airflow Python Script with execution_date in op_kwargs

Question

With assistance from this answer https://stackoverflow.com/a/41730510/4200352 I am executing a python file.

I use PythonOperator and am trying to include the execution date as an argument passed to the script.

I believe I can access it somehow through kwargs['execution_date'].

The below fails

DAG.py

from airflow import DAG
from airflow.operators.python_operator import PythonOperator
from datetime import datetime, timedelta

import sys
import os
sys.path.append(os.path.abspath("/home/glsam/OmegaAPI/airflow/scripts/PyPer_ogi_simple"))
from update_benchmarks import *


default_args = {
    'owner': 'airflow',
    'depends_on_past': False,
    'start_date': datetime(2018, 4, 23),
    'email': ['airflow@example.com'],
    'email_on_failure': False,
    'email_on_retry': False,
    'retries': 1,
    'retry_delay': timedelta(minutes=5),
}

dag = DAG('run_pyPer', default_args=default_args)

update_BM_G027 = PythonOperator(
    task_id='update_BM_G027',
    python_callable=update_bmk,
    dag=dag,
    op_kwargs={
        'bmk_code': 'G027',
        'is_hedged': False,
        'from_date': kwargs['execution_date'],
    })

Do maybe i need to use this answer to get the date then XCOM it to the task? https://stackoverflow.com/a/36754930/4200352

Answer 1

This is really a bit confusing and not very well documented.

You are already using the PythonOperator.

Now just add the option

provide_context=True,

and extend your callable with a pointer, e.g.

update_bmk(bmk_code, is_hedged, **context)

Now, within your function you will have access to all information about the task, including the execution date like so:

task_instance = context['task_instance']
execution_date = context['execution_date']

To see a full reference of items in the context, see https://airflow.apache.org/macros.html

Those are the docs for macros, but you can use the items in the context dictionary.