Defer traceback type.

claudevdm · claudevdm · commit ec52dc536346 · 2025-11-12T13:29:54.000-05:00
diff --git a/sdks/python/apache_beam/pipeline.py b/sdks/python/apache_beam/pipeline.py
@@ -639,7 +639,7 @@ def __exit__(
       self,
       exc_type: Optional[Type[BaseException]],
       exc_val: Optional[BaseException],
-      exc_tb: Optional[TracebackType]) -> None:
+      exc_tb: Optional['TracebackType']) -> None:
 
     try:
       if not exc_type:
