zhongjiajie commented on a change in pull request #4779: [AIRFLOW-3958] List 
tasks upstream work in chain
URL: https://github.com/apache/airflow/pull/4779#discussion_r296429828
 
 

 ##########
 File path: airflow/utils/helpers.py
 ##########
 @@ -150,19 +151,50 @@ def as_flattened_list(iterable):
 
 
 def chain(*tasks):
-    """
+    r"""
 
 Review comment:
   Thanks ash for the clarification

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