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Posted to commits@airflow.apache.org by GitBox <gi...@apache.org> on 2022/09/14 13:43:44 UTC

[GitHub] [airflow] ashb commented on a diff in pull request #26384: Work around pyupgrade edge cases

ashb commented on code in PR #26384:
URL: https://github.com/apache/airflow/pull/26384#discussion_r970826923


##########
airflow/models/baseoperator.py:
##########
@@ -1738,11 +1738,19 @@ def cross_downstream(
         task.set_downstream(to_tasks)
 
 
+# pyupgrade assumes all type annotations can be lazily evaluated, but this is
+# not the case for attrs-decorated classes, since cattrs needs to evaluate the
+# annotation expressions at runtime, and Python before 3.9.0 does not lazily
+# evaluate those. Putting the expression in a top-level assignment statement
+# communicates this runtime requirement to pyupgrade.
+BaseOperatorClassList = List[Type[BaseOperator]]

Review Comment:
   We're working on how we can remove cattrs https://github.com/apache/airflow/issues/26130 so hopefully we can remove this soon.



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