Add new file

example_python_operator.py

+# -*- coding: utf-8 -*-
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); 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
+
+import time
+from builtins import range
+from pprint import pprint
+
+from airflow.utils.dates import days_ago
+
+from airflow.models import DAG
+from airflow.operators.python_operator import PythonOperator
+
+args = {
+    'owner': 'wangzhaojun',
+    'start_date': days_ago(2),
+}
+
+dag = DAG(
+    dag_id='example_python_operator',
+    default_args=args,
+    schedule_interval=None,
+    tags=['example']
+)
+
+
+# [START howto_operator_python]
+def print_context(ds, **kwargs):
+    pprint(kwargs)
+    print(ds)
+    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,
+)
+# [END howto_operator_python]
+
+
+# [START howto_operator_python_kwargs]
+def my_sleeping_function(random_base):
+    """This is a function that will run within the DAG execution"""
+    time.sleep(random_base)
+
+
+# Generate 5 sleeping tasks, sleeping from 0.0 to 0.4 seconds respectively
+for i in range(5):
+    task = PythonOperator(
+        task_id='sleep_for_' + str(i),
+        python_callable=my_sleeping_function,
+        op_kwargs={'random_base': float(i) / 10},
+        dag=dag,
+    )
+
+    run_this >> task
+# [END howto_operator_python_kwargs]
\ No newline at end of file