[GitHub] [airflow] ashb commented on issue #16618: Access specific values within an `XCom` value using Taskflow API

[GitBox <gi...@apache.org>]

ashb commented on issue #16618:
URL: https://github.com/apache/airflow/issues/16618#issuecomment-876288276


   Hmmm, the "native" way I would like this to work is:
   
   ```python
   my_op.output['dataflow_job_id']
   # Ideal, would be equivalent. to my_op.xcom_pull(key='return_value')['dataflow_job_id']
   ```
   
   But sadly XComArg already has a `__getitem__` to override the key, which means it is actually 
   
   ```python
   my_op.output['dataflow_job_id']
   # Ideal, would be equivalent. to my_op.xcom_pull(key="dataflow_job_id"]
   ```
   
   If we hadn't yet released it, I would have suggested that the facility to change the key should have been done by `__getattr__`, yielding:
   
   ```python
   my_op.output.some_xcom_key # my_op.xcom_pull(key='some_xcom_key')
   my_op.output['attr'] # my_op.xcom_pull(key='return_value')['attr']
   ```
   
   But that ship is sailed, so I'm not sure how to proceed nicely.


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