如何判断python中的连接是否已经死亡

import socket
import time

def check_connection(host, port, timeout=5):
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(timeout)
        s.connect((host, port))
        s.shutdown(socket.SHUT_RDWR)
        s.close()
        return True
    except:
        return False

host = "example.com"
port = 80

while True:
    if check_connection(host, port):
        print("Connection is alive")
    else:
        print("Connection is dead")
    time.sleep(1)