Python 3 compat: convert keys() to list

Author: SylvainCorlay

ipykernel/kernelbase.py

@@ -475,7 +475,7 @@ def comm_list_request(self, stream, ident, parent):
 
         # Should this be moved to ipkernel?
         if hasattr(self, 'comm_manager'):
-            comm_list = self.comm_manager.comms.keys()
+            comm_list = list(self.comm_manager.comms.keys())
         else:
             comm_list = []
         reply_content = dict(comm_list=comm_list)