[GitHub] [airflow] Taragolis commented on issue #25409: [Templating]: attributes not defined in `templated_fields` also get value rendered

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

Taragolis commented on issue #25409:
URL: https://github.com/apache/airflow/issues/25409#issuecomment-1199925757

   I think the root of the problem is that Python strings is immutable, but list is mutable.
   
   
   ```python
   from copy import copy
   
   class TestOperator(BaseOperator):
     template_fields: Sequence[str] = ("inputs", "inputs_one", "inputs_two")
     template_ext: Sequence[str] = (".sql",)
   
     def __init__(self, inputs, inputs_one, inputs_two, **base_operator_kwargs):
       super().__init__(**base_operator_kwargs)
   
     def __init__(self, inputs, inputs_one, inputs_two, **base_operator_kwargs):
       super().__init__(**base_operator_kwargs)
   
       # should render, create shallow copy of original objects
       # might required deepcopy, if nested object also mutable.
       # from copy import deepcopy
       self.inputs = copy(inputs)
       self.inputs_one = copy(inputs_one)
       self.inputs_two = copy(inputs_two)
   
       # shouldn't render
       self.original_inputs_str = inputs
       self.original_inputs_one = inputs_one
       self.original_inputs_two = inputs_two
   ```


-- 
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: commits-unsubscribe@airflow.apache.org

For queries about this service, please contact Infrastructure at:
users@infra.apache.org