ephraimbuddy commented on issue #19096:
URL: https://github.com/apache/airflow/issues/19096#issuecomment-950888668
The dag above doesn't appear on the UI and doesn't show import errors,
probably needs modification. However, I saw the error from:
```
from datetime import datetime
from airflow.models import DAG
dag = DAG("paramtest",
start_date=datetime(2021, 1, 1),
schedule_interval="@daily")
@dag.task(params={"a": {1, 2, 3}, "b": {3, 4, 5}})
def intersect(intersection):
print(intersection)
intersect("{{ params.a.intersection(params.b).pop() }}")
```
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