python paramiko模块实现ssh命令

#!/usr/bin/env python
import paramiko
import sys,os
hostname='192.168.1.60'
#sys,argv[1]
username='root'
password='password'
cmd='free -m'
#cmd=sys.argv[2]
def findkdy():
  
paramiko.util.log_to_file('syslogin.log')
ssh=paramiko.SSHClient()
ssh.load_system_host_keys()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(hostname=hostname,port=22,username=username,password=password,timeout=5)
stdin,stdout,stderr=ssh.exec_command(cmd)
print stdout.read(),stderr.read()
ssh.close()