mlgruby commented on a change in pull request #11107:
URL: https://github.com/apache/airflow/pull/11107#discussion_r493768369



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File path: airflow/providers/ftp/hooks/ftp.py
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@@ -248,7 +248,7 @@ def get_mod_time(self, path: str) -> datetime.datetime:
         except ValueError:
             return datetime.datetime.strptime(time_val, '%Y%m%d%H%M%S')
 
-    def get_size(self, path):
+    def get_size(self, path: str) -> Union[int, str]:

Review comment:
       because of implicit return of string from size() I have put an option of 
either int or str. 




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