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])