Python用SSH连接到网络设备

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'''

#!/usr/bin/env python
#coding:utf-8

from netmiko import ConnectHandler
from netmiko.ssh_exception import NetMikoTimeoutException
from netmiko.ssh_exception import NetMikoAuthenticationException
from datetime import datetime
import time
import logging
from my_devices import device_list as devices

'定义类'
class SSH_Client():
 '定义login_host函数，用于登陆设备'
 def login_host(self , a_device):
  try:
   self.ssh = ConnectHandler(**a_device)
   self.ssh.enable()
   reply = self.ssh.find_prompt()
   print('>' * 10 + '成功登陆结果如下:' + '>' * 10 + '\n' + reply)
   return True
  except ValueError:
   logging.warning(a_device['host'] + ' Secret 密码错误')
  except NetMikoTimeoutException:
   logging.warning(a_device['host'] + ' 连接不上设备,请检查网络是否正常通信')
  except NetMikoAuthenticationException:
   logging.warning(a_device['host'] + ' 登陆失败，用户名或密码错误')

 '定义do_cmd函数,用于执行命令'
 def do_cmd(self,cmds):
  '读取文件，for语句循环执行命令'
  with open(cmds) as cmd_obj:
   for cmd in cmd_obj:
    reply = self.ssh.send_command(cmd)
    time.sleep(2)
    logging.warning('>' * 10 + cmd.rstrip() + ' 命令执行结果如下:' + '>' * 10 + '\n' + reply)
 '定义logout_host函数，关闭程序'
 def logout_host(self):
  self.ssh.disconnect()

if __name__ == '__main__':
 cmds = 'cmd.txt' # 存放执行命令文件，相对路径
 ssh_client = SSH_Client()
 start_time = datetime.now()
 for a_device in devices:
  '如果登录结果为True，则执行命令，然后退出'
  if ssh_client.login_host(a_device):
   ssh_client.do_cmd(cmds)
   ssh_client.logout_host()
   time.sleep(2)
 stop_time = datetime.now()
 print('总花费时长：{0}\n'.format(stop_time - start_time))