symbols = ['BTCUSDT', 'ETHUSDT'] twm = ThreadedWebsocketManager() twm.start() twm.start_multiplex_socket(callback=lambda msg: print('Spot:', msg), streams=[f'{s.lower()}@bookTicker' for s in symbols]) twm.start_futures_multiplex_socket(callback=lambda msg: print('Futures:', msg), streams=[f'{s.lower()}@bookTicker' for s in symbols])