python多线程批量操作交换机

import time
import socket
import threading

def device_info():
    ip_list = []
    name_list = []
    user_list = []
    passwd_list = []
    f = open('devices_list.txt',encoding='UTF-8')
    for line in f.readlines():
        line_s = line.split()
        device_ip = line_s[0]
        device_name = line_s[1]
        username = line_s[2]
        passwd = line_s[3]
        ip_list.append(device_ip)
        name_list.append(device_name)
        user_list.append(username)
        passwd_list.append(passwd)
    f.close()
    return ip_list,name_list,user_list,passwd_list

def ssh_f(ip,name,user,passwd):
    data = time.strftime('%Y-%m-%d')
    ssh_client = paramiko.SSHClient()
    ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh_client.connect(hostname=ip, username=user, password=passwd)
    print('成功连接', ip, name,'\n')
    cmd_file = open('cmd.txt', 'r')
    cmds = cmd_file.readlines()
    log = open(r'D:\BaiduNetdiskDownload\test\巡检日志\\' + ip + name + data + '.txt', 'a')
    command = ssh_client.invoke_shell()
    command.send('terminal length 0\n')  # 取消单屏显示
    for cmd in cmds:
        command.send(cmd+'\n')
    time.sleep(1)
    output = command.recv(65535)
    log.write(output.decode('UTF-8'))
    print(ip + '日志载入成功'+'\n')
    ssh_client.close()
    log.close()

def main():
    device_authentication_failed_list = []
    device_not_reachable_list = []
    ip_list,name_list,user_list,passwd_list = device_info()
    for ip,name,user,passwd in zip(ip_list,name_list,user_list,passwd_list):  # 遍历多个列表可以用zip
        try:
            a = threading.Thread(target=ssh_f,args=(ip,name,user,passwd))
            a.start()
        except paramiko.ssh_exception.AuthenticationException:
            print(name + '(' + ip + ')' + '身份验证登录失败..')
            device_authentication_failed_list.append(ip)
        except socket.error:
            print(name + '(' + ip + ')' + ' 网络无法访问..')
            device_not_reachable_list.append(ip)
    time.sleep(5)
    print('\n以下设备身份验证登录失败： ')
    if device_authentication_failed_list == []:
        print('nothing')
    else:
        for i in device_authentication_failed_list:
            print(i)
    print('\n网络无法访问以下设备：')
    if device_not_reachable_list == []:
        print('nothing')
    else:
        for i in device_not_reachable_list:
            print(i)

if __name__ == '__main__':
    main()