robertwb commented on a change in pull request #11005: [BEAM-8335] Modify the 
StreamingCache to subclass the CacheManager 
URL: https://github.com/apache/beam/pull/11005#discussion_r387341699
 
 

 ##########
 File path: sdks/python/apache_beam/runners/interactive/cache_manager.py
 ##########
 @@ -167,20 +177,35 @@ def load_pcoder(self, *labels):
         self._saved_pcoders[self._path(*labels)])
 
   def read(self, *labels):
+    # Return an iterator to an empty list if it doesn't exist.
     if not self.exists(*labels):
-      return [], -1
+      return [].__iter__(), -1
 
 Review comment:
   Thanks .`iter([])` is slightly more idiomatic, but this is fine. 

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