erdos2n opened a new issue, #23833:
URL: https://github.com/apache/airflow/issues/23833
### Apache Airflow version
2.3.0 (latest released)
### What happened
The following DAG was written and expected to generate 3 tasks (one for each
string in the list)
**dag_code**
```python
import logging
from airflow.decorators import dag, task
from airflow.operators.python import PythonOperator
from airflow.utils.dates import datetime
def log_strings_operator(string, *args, **kwargs):
logging.info("we've made it into the method")
logging.info(f"operator log - {string}")
@dag(
dag_id='dynamic_dag_test',
schedule_interval=None,
start_date=datetime(2021, 1, 1),
catchup=False,
tags=['example', 'dynamic_tasks']
)
def tutorial_taskflow_api_etl():
op2 = (PythonOperator
.partial(task_id="logging_with_operator_task",
python_callable=log_strings_operator)
.expand(op_kwargs=[{"string": "a"}, {"string": "b"}, {"string":
"c"}]))
return op2
tutorial_etl_dag = tutorial_taskflow_api_etl()
```
**error message**
```python
Broken DAG: [/usr/local/airflow/dags/dynamic_dag_test.py] Traceback (most
recent call last):
File
"/usr/local/lib/python3.9/site-packages/airflow/serialization/serialized_objects.py",
line 343, in _serialize
return SerializedBaseOperator.serialize_mapped_operator(var)
File
"/usr/local/lib/python3.9/site-packages/airflow/serialization/serialized_objects.py",
line 608, in serialize_mapped_operator
assert op_kwargs[Encoding.TYPE] == DAT.DICT
TypeError: list indices must be integers or slices, not Encoding
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/usr/local/lib/python3.9/site-packages/airflow/serialization/serialized_objects.py",
line 1105, in to_dict
json_dict = {"__version": cls.SERIALIZER_VERSION, "dag":
cls.serialize_dag(var)}
File
"/usr/local/lib/python3.9/site-packages/airflow/serialization/serialized_objects.py",
line 1013, in serialize_dag
raise SerializationError(f'Failed to serialize DAG {dag.dag_id!r}: {e}')
airflow.exceptions.SerializationError: Failed to serialize DAG
'dynamic_dag_test': list indices must be integers or slices, not Encoding
```
### What you think should happen instead
Dag should contain 1 task `logging_with_operator_task` that contains 3
indices
### How to reproduce
copy/paste dag code into a dag file and run on airflow 2.3.0. Airflow UI
will flag the error
### Operating System
Debian
### Versions of Apache Airflow Providers
_No response_
### Deployment
Astronomer
### Deployment details
_No response_
### Anything else
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
