25. Demo 5: Context and Templating

Correction: At timestamp 0.05 in the video above, the ending square bracket is missing. It should be
python print(f"Hello {kwargs['execution_date']}")

Here is the Apache Airflow documentation on context variables that can be included as kwargs.

Here is a link to a blog post that also discusses this topic.

Runtime Variables

Airflow leverages templating to allow users to “fill in the blank” with important runtime variables for tasks.

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

def hello_date(*args, **kwargs):
    print(f“Hello {kwargs[‘execution_date’]}”)

divvy_dag = DAG(...)
task = PythonOperator(
    task_id=’hello_date’,
    python_callable=hello_date,
    provide_context=True,
    dag=divvy_dag)