DAG is not visible on Airflow UI - airflow

Question

This is my dag file in dags folder.
Code that goes along with the Airflow located at:
http://airflow.readthedocs.org/en/latest/tutorial.html
"""
from airflow import DAG
from airflow.operators.dummy_operator import DummyOperator
from airflow.operators.python_operator import PythonOperator
from datetime import datetime, timedelta
from work_file import Test
class Main(Test):
def __init__(self):
super(Test, self).__init__()
def create_dag(self):
default_args = {
"owner": "airflow",
"depends_on_past": False,
"start_date": datetime(2015, 6, 1),
"email": ["airflow#airflow.com"],
"email_on_failure": False,
"email_on_retry": False,
"retries": 1,
"retry_delay": timedelta(minutes=5),
# 'queue': 'bash_queue',
# 'pool': 'backfill',
# 'priority_weight': 10,
# 'end_date': datetime(2016, 1, 1),
}
dag = DAG("python_dag", default_args=default_args, schedule_interval='0 * * * *')
dummy_task = DummyOperator(task_id='dummy_task', retries=3)
python_task = PythonOperator(task_id='python_task', python_callable=self.my_func)
dummy_task >> python_task
if __name__ == "__main__":
a = Main()
a.create_dag()
This is my other file work_file.py which is in the same dags folder.
class Test:
def __init__(self):
pass
def my_func(self):
return "Hello"
Aim:-The Aim is to call the my_func from my dag file.
Problem:- There seems to be no error on the UI,but my dag python_dag is not visible.
My server, scheduler is also running, I've tried restarting the same but nothing happened.
I have imported the file as well (from work_file import Test)
Thanks in advance!

Answer 1

There are multiple problems with the DAG:
The operators are not assigned to any DAG. Add dag=dag to the constructors. E.g., DummyOperator(..., dag=dag).
create_dag() does not return the DAG. Add return dag.
The DAG script is not executed as the top level code. That is, the modules __name__ is never '__main__'. Remove if __name__ == "__main__":.
The DAG objects must be in the global namespace of the module. Assign the return value of create_dag() to a variable: dag = a.create_dag().