demo:

#!/usr/bin/env python3
# coding=utf-8

import socket
import threading


class tcp_server_thread(threading.Thread):
    def __init__(self):
        super().__init__()

    def run(self) -> None:
        print("+server run", self.name)
        server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        server.settimeout(30)
        server.bind(("192.168.1.30", 4444))
        server.listen(1)    # 客户端排队上限
        # server.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, True)
        # server.ioctl(socket.SIO_KEEPALIVE_VALS, (1, 5000, 2000))
        # server.setblocking(True)
        try:
            client, client_address = server.accept()
            data = client.recv(10)
            print("+server receive:", data.decode(), "from", client_address)
            client.send("RECEIVED".encode())
        except Exception as e:
            print(e)
        finally:
            server.close()
            print("+server closed")


class tcp_client_thread(threading.Thread):
    def __init__(self):
        super().__init__()

    def run(self) -> None:
        print("-client run", self.name)
        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        client.settimeout(30)
        # client.connect(("192.168.1.30", 4444))
        connect_result = client.connect_ex(("192.168.1.30", 4444))
        print("-connect result code:", connect_result)
        try:
            print("-client send")
            client.send("WORLD".encode())
            data = client.recv(10)
            print("-client receive:", data.decode())
        except Exception as e:
            print(e)
        finally:
            client.close()
            print("-client closed")


if __name__ == "__main__":
    server_th = tcp_server_thread()
    client_th = tcp_client_thread()
    server_th.start()
    client_th.start()
    server_th.join()
    client_th.join()
    print("main end")

运行结果：