human
Solve the following python programming problem given the following code:
def _open_db(self) : 
    self.db_conn = adbapi.ConnectionPool ('sqlite3', os.path.join (self.db_dir, 'live_stream.db'), check_same_thread = False) 
    def create_tables(transaction) : 
        transaction.execute ((((((('create table if not exists live_streams (' + '    stream_hash text primary key, ') + '    public_key text, ') + '    key text, ') + '    stream_name text, ') + '    next_announce_time real') + ')')) 
        transaction.execute (((((((((('create table if not exists live_stream_blobs (' + '    blob_hash text, ') + '    stream_hash text, ') + '    position integer, ') + '    revision integer, ') + '    iv text, ') + '    length integer, ') + '    signature text, ') + '    foreign key(stream_hash) references live_streams(stream_hash)') + ')')) 
        transaction.execute ((((('create table if not exists live_stream_descriptors (' + '    sd_blob_hash TEXT PRIMARY KEY, ') + '    stream_hash TEXT, ') + '    foreign key(stream_hash) references live_streams(stream_hash)') + ')')) 
return self.db_conn.runInteraction (self) 

    
    

    Fix the buggy line: return self.db_conn.runInteraction (self)
assistant
#Here is Python program to fix the buggy line: return self.

return self.db_conn.runInteraction (def create_tables()