[GitHub] [airflow] mik-laj commented on a change in pull request #6348: [AIRFLOW-XXX] GSoD: Adding 'Create a custom operator' doc

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mik-laj commented on a change in pull request #6348: [AIRFLOW-XXX] GSoD: Adding 'Create a custom operator' doc
URL: https://github.com/apache/airflow/pull/6348#discussion_r335442078
 
 

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 File path: docs/howto/operator/custom-operator.rst
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+ .. 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.
+
+
+Create Custom Operator
+=======================
+
+
+Airflow allows you to create new operators to suit the requirements of you or your team. 
+The extensibility is one of the many reasons which makes Apache Airflow powerful. 
+
+You can create any operator you want by extending the :class:`airflow.models.baseoperator.BaseOperator`
+
+There are two methods that you need to override in derived class:
+
+* Constructor - Define the parameters required for the operator. You only need to specify the arguments specific to your operator.
+
+* Execute - The code to execute when the runner calls the operator. The method contains the 
+  airflow context as a parameter that can be used to read config values.
+
+Let's implement an example ``HelloOperator``:
+
+.. code::  python
+
+        class HelloOperator(BaseOperator):
+
+            def __init__(
+                    self,
+                    name: str,
+                    *args, **kwargs) -> None:
+                super().__init__(*args, **kwargs)
+                self.name = name
+
+            def execute(self, context):
+                message = "Hello {}".format(name)
+                print(message)
+                return message
+
+The above operator can now be used as follows:
+
+.. code:: python
+
+    hello_task = HelloOperator(task_id='', dag=dag, name='foo_bar')
 
 Review comment:
   ```suggestion
       hello_task = HelloOperator(task_id='sample-task', dag=dag, name='foo_bar')
   ```

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