<s> """<STR_LIT>""" <EOL> class BackedObject ( object ) : <EOL> def __init__ ( self , backing_store , identifier ) : <EOL> self . backing_store = backing_store <EOL> self . identifier = identifier <EOL> def backed_value ( self , key , default = None ) : <EOL> return self . backing_store . get ( self . identifier , key , default ) </s>
