Python实现批量更改网络设备名

import paramiko
import datetime 
import time
f=open('./hostnames.txt','r')
hostnames=f.readlines()

#hostnames=['1.1.1.1','2.2.2.2','3.3.3.3','192.168.99.10','192.168.99.20']
#连接登录设备
for hostname in hostnames:
    hostname=hostname.strip()
    ssh_client=paramiko.SSHClient()
    ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh_client.connect(hostname=hostname,username='python',password='123456')
    print('Sucessfully conneted to ',hostname)
    #提取网络设备主机名
    cmd=ssh_client.invoke_shell()
    cmd.send('sys\n')
    cmd.send('dis curr | include sysname\n')

    time.sleep(1)
    result=cmd.recv(66666)
    result=result.decode('ascii')
    items=result.splitlines()
    for item in items:      
        item=item.strip()
        if item.startswith('sysname'): 
            device_name=item.split(' ')[-1]
    #修改网络设备主机名     
    device_name=device_name+'-35'  
    cmd.send(f'sys {device_name}\n')
    time.sleep(1)
    cmd.send('quit\n')
    cmd.send('save\n')
    time.sleep(1)
    cmd.send('y\n')
    #print(result)
    print('the sysname operation has  finshed!!!')
    ssh_client.close()