Created
August 16, 2018 00:31
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| # you may not use this file except in compliance with the License. | |
| # You may obtain a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, software | |
| # distributed under the License is distributed on an "AS IS" BASIS, | |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| # See the License for the specific language governing permissions and | |
| # limitations under the License. | |
| from __future__ import print_function | |
| from builtins import range | |
| import airflow | |
| from airflow.operators.python_operator import PythonOperator | |
| from airflow.models import DAG | |
| import time | |
| from pprint import pprint | |
| args = { | |
| 'owner': 'airflow', | |
| 'start_date': airflow.utils.dates.days_ago(2) | |
| } | |
| dag = DAG( | |
| dag_id='example_python_operator', default_args=args, | |
| schedule_interval=None) | |
| def my_sleeping_function(random_base): | |
| """This is a function that will run within the DAG execution""" | |
| time.sleep(random_base) | |
| def print_context(ds, **kwargs): | |
| pprint(kwargs) | |
| print(ds) | |
| import sys | |
| pprint(sys.path) | |
| return 'Whatever you return gets printed in the logs' | |
| run_this = PythonOperator( | |
| task_id='print_the_context', | |
| provide_context=True, | |
| python_callable=print_context, | |
| dag=dag) | |
| # Generate 10 sleeping tasks, sleeping from 0 to 9 seconds respectively | |
| for i in range(10): | |
| task = PythonOperator( | |
| task_id='sleep_for_' + str(i), | |
| python_callable=my_sleeping_function, | |
| op_kwargs={'random_base': float(i) / 10}, | |
| dag=dag) | |
| task.set_upstream(run_this) |
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