import cPickle as pickle


    def _loadData(self, oid):                                                         
        f = file(self._makeFilename(str(oid)), 'rb')                                  
        return pickle.load(f)                                                         
                                                                                      
                                                                                                                                                                            
    def _saveData(self, oid, data):                                                   
        f = file(self._makeFilename(str(oid)), 'wb')                                  
        pickle.dump(data, f, pickle.HIGHEST_PROTOCOL)