Remove trailing whitespaces.

src/memory/persistent.py

@@ -74,7 +74,7 @@ class PersistentDict:
 
     def __cmp__(self, other):
         return self._cache.__cmp__(other)
-    
+
     def __hash__(self):
         return self._cache.__hash__()
 
@@ -117,7 +117,7 @@ class PersistentDict:
 
 class PersistentBinaryDict(PersistentDict):
     """Persistent dict where value can be any python data (instead of string only)"""
-    
+
     def load(self):
         """load persistent data from storage
         """