请问我用pexpect操作远程机的脚本在一台机子上可以执行但在另外一台机子上不行呢？

#!/usr/bin/env python

import pexpect

from pexpect import *

ip = '172.25.38.22'

user = 'jeremyyuan'

pwd = 'qq17:00'

path = '/data/jeremyyuan/ServerFile'

returnstr='scuuessfully'

loggs=['begin']

foo = pexpect.spawn('sftp -oPort=36000 %s@%s' %(user,ip))

index = foo.expect(['password:','yes/no',pexpect.EOF,pexpect.TIMEOUT])

loggs.append('this timea %s' % index)

if index == 0:

  foo.sendline(pwd)

elif index == 1:

  foo.sendline('yes')

  index = foo.expect(['password:','yes/no',pexpect.EOF,pexpect.TIMEOUT])

  if index !=0:

    print "sftp login failed"

    foo.close(force=True)

  foo.sendline(pwd)

index = foo.expect(['sftp>','Permission denied, please try again',pexpect.EOF,pexpect.TIMEOUT])

if index == 0:

  loggs.append("sftp>")

  foo.sendline('cd %s' % path)

  foo.sendline('mkdir tttttttttt')

  print 'upload file....'

  index = foo.expect(['sftp>',pexpect.EOF,pexpect.TIMEOUT])

  if index == 0:

    foo.sendline('quit')

    loggs.append("success")

#except pexpect.EOF:

  foo.close()

else:

  print "wrong"

print loggs