python paramiko实现SSH 多台设备一条命令

代码：

import paramiko
import time


def get_connection(host, username, password, port):
   ssh = paramiko.SSHClient()
   ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
   ssh.connect(hostname=host,username=username, password=password, port=port, look_for_keys=False, allow_agent=False)
   return ssh 

devices = {
   'linux1': {
      'ip': 'xxx',
      'username': 'xxx',
      'password': 'xxx',
      'port': '22'
      },
   'linux2': {
      'ip': 'xxx',
      'username': 'xxx',
      'password': 'xxx',
      'port': '22'
      }
   }

command = 'uname -a \n'

for device in devices.keys(): 
   print(f"Executing on device: {devices[device]['ip']}\n\n")
   ssh = get_connection(host=devices[device]['ip'], username=devices[device]['username'], password=devices[device]['password'], port=devices[device]['port'])
   stdin, stdout, stderr = ssh.exec_command(command)
   output = stdout.readlines()

   print(' '.join(map(str, output)))