potiuk commented on issue #19477:
URL: https://github.com/apache/airflow/issues/19477#issuecomment-963448627
Copied from discussion:
here is some code examples:
```
from datetime import datetime
from airflow.operators.python_operator import PythonOperator
from airflow import DAG
with DAG('a_dag', schedule_interval=None, default_args={'start_date':
datetime(2018, 1, 1, 0, 0, 0)}) as dag:
def success(*args, **kwargs):
print('ok')
some_task = PythonOperator(task_id='some_tasks', python_callable=success)
```
and with new task
```
from datetime import datetime
from airflow.operators.python_operator import PythonOperator
from airflow import DAG
with DAG('a_dag', schedule_interval=None, default_args={'start_date':
datetime(2018, 1, 1, 0, 0, 0)}) as dag:
def success(*args, **kwargs):
print('ok')
some_task = PythonOperator(task_id='some_tasks', python_callable=success)
new_task = PythonOperator(task_id='new_task', python_callable=success)
and steps to reproduce:
```
1. Define "a_dag" with "some_tasks".
2. Create dag run (manually or by schedule)
3. Add "new_task" into dag, deploy code
4. Select "new_task" in UI and press "Run" button
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