我目前正在尝试从Binance实时传输价格，但在运行代码后，即使程序正在运行，我也会看到一个空白屏幕。
下面是代码：

import os
from binance.client import Client
import time
from binance import ThreadedWebsocketManager
from binance import ThreadedDepthCacheManager

api_key = os.environ.get('api_key')
api_secret = os.environ.get('api_secret')
client = Client(api_key, api_secret)

def main():

    symbol = 'BTCUSDT'
    twm = ThreadedWebsocketManager(api_key=api_key, api_secret=api_secret)
    
    #Start is required to initialise its internal loop
    twm.start()

    def handle_socket_message(msg):
        print(f"message type: {msg['e']}")
        print(msg)

    twm.start_kline_socket(callback=handle_socket_message, symbol=symbol)
    
    twm.join()

if __name__ == "__main__":
   main()