@XD-DENG I just tested this with some of the example dags in
https://github.com/apache/incubator-airflow/tree/master/airflow/example_dags.
Can you test your code with different schedule types including `@once`,
`daily/weekly`, `timedelta(hours=1)`, etc... in addition to the case you
provide which is cron expressions. Also, can you add tests for these?
```
(venv) sianand@LM-SJN-21002367:~/Projects/airflow_incubator $ airflow
next_execution latest_only
[2018-09-04 10:52:19,613] {__init__.py:51} INFO - Using executor
SequentialExecutor
/Users/sianand/miniconda3/lib/python3.6/site-packages/apache_airflow-2.0.0.dev0+incubating-py3.6.egg/airflow/bin/cli.py:1724:
DeprecationWarning: The celeryd_concurrency option in [celery] has been
renamed to worker_concurrency - the old setting has been used, but please
update your config.
default=conf.get('celery', 'worker_concurrency')),
[2018-09-04 10:52:19,822] {models.py:260} INFO - Filling up the DagBag from
/Users/sianand/Projects/airflow_incubator/dags
[2018-09-04 10:52:19,882] {example_kubernetes_operator.py:55} WARNING - Could
not import KubernetesPodOperator: No module named 'kubernetes'
[2018-09-04 10:52:19,882] {example_kubernetes_operator.py:56} WARNING - Install
kubernetes dependencies with: pip install apache-airflow[kubernetes]
Traceback (most recent call last):
File "/Users/sianand/miniconda3/bin/airflow", line 4, in <module>
__import__('pkg_resources').run_script('apache-airflow==2.0.0.dev0+incubating',
'airflow')
File
"/Users/sianand/miniconda3/lib/python3.6/site-packages/pkg_resources/__init__.py",
line 654, in run_script
self.require(requires)[0].run_script(script_name, ns)
File
"/Users/sianand/miniconda3/lib/python3.6/site-packages/pkg_resources/__init__.py",
line 1434, in run_script
exec(code, namespace, namespace)
File
"/Users/sianand/miniconda3/lib/python3.6/site-packages/apache_airflow-2.0.0.dev0+incubating-py3.6.egg/EGG-INFO/scripts/airflow",
line 32, in <module>
args.func(args)
File
"/Users/sianand/miniconda3/lib/python3.6/site-packages/apache_airflow-2.0.0.dev0+incubating-py3.6.egg/airflow/utils/cli.py",
line 74, in wrapper
return f(*args, **kwargs)
File
"/Users/sianand/miniconda3/lib/python3.6/site-packages/apache_airflow-2.0.0.dev0+incubating-py3.6.egg/airflow/bin/cli.py",
line 562, in next_execution
print(dag.following_schedule(dag.latest_execution_date))
File
"/Users/sianand/miniconda3/lib/python3.6/site-packages/apache_airflow-2.0.0.dev0+incubating-py3.6.egg/airflow/models.py",
line 3371, in following_schedule
return dttm + self._schedule_interval
TypeError: unsupported operand type(s) for +: 'NoneType' and
'datetime.timedelta'
```
[ Full content available at:
https://github.com/apache/incubator-airflow/pull/3834 ]
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