uranusjr commented on a change in pull request #18471:
URL: https://github.com/apache/airflow/pull/18471#discussion_r715913452
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File path: airflow/operators/python.py
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@@ -178,6 +178,16 @@ class BranchPythonOperator(PythonOperator, SkipMixin):
def execute(self, context: Dict):
branch = super().execute(context)
+ # TODO: The logic should be moved to SkipMixin to be available to all
branch operators.
+ if not isinstance(branch, (str, List)):
+ raise AirflowException("Branch callable must return either a task
ID or a list of IDs")
+ branches = {branch}
Review comment:
```suggestion
if isinstance(branch, str):
branches = {branch}
elif isinstance(branch, list):
branches = set(branch)
else:
raise AirflowException("Branch callable must return either a
task ID or a list of IDs")
```
Otherwise if `branch` is a list (e.g. `["task_a", "task_b"]`), `branches`
would become a set containing one list of strings (`{["task_a", "task_b"]}`).
We need a set of strings (`{"task_a", "task_b"}`).
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