raise AttributeError in __getattr__ if lookup fails

Author: vincentschut

zarr/hierarchy.py

@@ -319,7 +319,10 @@ def _delitem_nosync(self, item):
 
     def __getattr__(self, item):
         # allow access to group members via dot notation
-        return self.__getitem__(item)
+        try:
+            return self.__getitem__(item)
+        except KeyError:
+            raise AttributeError
 
     def group_keys(self):
         """Return an iterator over member names for groups only.