Dev-iL commented on PR #65197:
URL: https://github.com/apache/airflow/pull/65197#issuecomment-4335649553
Made another pass.
Some patterns like `"{{ task_instance.xcom_pull('upload_sheet_to_gcs')[0]
}}"` were not replaced because of an integer index (`[0]`) and since
`XComArg.__getitem__` only accepts `str` keys:
```python
# xcom_arg.py:216-220
def __getitem__(self, item: str) -> XComArg:
if not isinstance(item, str):
raise ValueError(f"XComArg only supports str lookup, received
{type(item).__name__}")
return PlainXComArg(operator=self.operator, key=item)
```
So `upload_sheet_to_gcs.output[0]` would raise at DAG parse time.
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