def append_val(self, key, val):
        try:
            current = self.deserialize( self.storage[key])
        except __HOLE__:
            current = []

        # update new list
        current.append( val)
        self.storage[key] = self.serialize(current)
dataset/ETHPy150Open brandonrobertz/SparseLSH/sparselsh/storage.py/BerkeleyDBStorage.append_val