socket 反复连接

import socket  
  
def start_server():  
    # 创建一个TCP/IP套接字  
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
      
    # 绑定到地址和端口  
    server_address = ('localhost', 12345)  
    print(f'Starting up on {server_address[0]} port {server_address[1]}')  
    server_socket.bind(server_address)  
      
    # 开始监听连接  
    server_socket.listen(1)  
      
    while True:  
        # 等待客户端连接  
        print('Waiting for a connection')  
        connection, client_address = server_socket.accept()  
          
        try:  
            print(f'Connection from {client_address}')  
              
            # 接收数据并发送回客户端  
            while True:  
                data = connection.recv(1024)  
                print(f'Received {len(data)} bytes from {client_address}')  
                if data:  
                    print(f'Sending data back to the client')  
                    connection.sendall(data)  
                else:  
                    print('No more data from', client_address)  
                    break  
                  
        finally:  
            # 清理连接  
            connection.close()  
  
if __name__ == '__main__':  
    start_server()