python远程执行命令

def run():
    try:
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(HostIP, 22, username, passwd)
        stdin, stdout, stderr = ssh.exec_command('w')
        cmd_result = stdout.read(), stderr.read()
        for line in cmd_result:
            print line
    except Exception as ex:
        print "\tError %s\n" % ex