import select
import socket
<h1>创建服务端套接字</h1><p>server_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_sock.bind(('localhost', 8888))
server_sock.listen(5)
server_sock.setblocking(False)  # 设为非阻塞</p><h1>初始化监听列表</h1><p>inputs = [server_sock]  # 监听可读事件
outputs = []            # 监听可写事件（可选）
excepts = []             # 异常监听</p><p>print("Server running on localhost:8888")</p>
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                <p>while True:</p><h1>调用 select</h1><pre class='brush:python;toolbar:false;'>readable, writable, exceptional = select.select(inputs, outputs, inputs, 1.0)

for sock in readable:
    if sock is server_sock:
        # 有新连接
        client_sock, addr = sock.accept()
        client_sock.setblocking(False)
        inputs.append(client_sock)
        print(f"New connection from {addr}")
    else:
        # 已有连接发来数据
        try:
            data = sock.recv(1024)
            if data:
                print(f"Received: {data.decode()}")
                # 可以加入到输出列表，准备回传
                if sock not in outputs:
                    outputs.append(sock)
            else:
                # 客户端断开
                print("Client disconnected")
                if sock in outputs:
                    outputs.remove(sock)
                inputs.remove(sock)
                sock.close()
        except ConnectionResetError:
            inputs.remove(sock)
            if sock in outputs:
                outputs.remove(sock)
            sock.close()

for sock in writable:
    # 这里可以发送响应
    try:
        sock.send(b"Echo: Message received\n")
        outputs.remove(sock)  # 发送完移除
    except Exception as e:
        print(f"Send error: {e}")
        inputs.remove(sock)
        outputs.remove(sock)
        sock.close()

for sock in exceptional:
    # 处理异常
    inputs.remove(sock)
    if sock in outputs:
        outputs.remove(sock)
    sock.close()