Python pexpect问题

Question

好的，我正在编写一个脚本来保存我的网络设备上的配置。我哪里出错了，我不知道在哪里。它不会发送最后确认的"y“字符，但我认为这是由于我告诉它的期待。

当前代码：

import pexpect
import sys
import os
import time
import getpass

hostname = "switch1"
username = raw_input('Enter Your username: ')
password = getpass.getpass('Password:')
fout = file('mylog.txt','w')

child = pexpect.spawn('ssh %s@%s' % (username, hostname))
child.logfile_read = fout
child.expect('myusername@%s\'s password:' % hostname)
child.sendline(password)
child.expect('>')
child.sendline('enable')
child.expect('Password:')
child.sendline(password)
child.expect('#')
child.sendline('wr mem')
child.expect("Are you sure you want to save? (y/n) ")
child.sendline('y')
child.expect('#')
child.sendline('logout')

我也尝试过这句话，它产生了同样的结果：

child.expect("\r\n\r\nThis operation may take a few minutes.\r\nManagement interfaces will not be available during this time.\r\n\r\nAre you sure you want to save? (y/n) ")

下面是我的开关上的样子：

(switch1) #write mem

This operation may take a few minutes.
Management interfaces will not be available during this time.

Are you sure you want to save? (y/n) y

Config file 'startup-config' created successfully .


Configuration Saved!

(switch1) #

下面是运行脚本时遇到的错误：

python wrmem.py 
Enter Your username: myusername
Password:
Traceback (most recent call last):
  File "wrmem.py", line 35, in <module>
    child.expect("Are you sure you want to save? (y/n) ")
  File "/usr/local/lib/python2.7/dist-packages/pexpect/spawnbase.py", line 327, in expect
    timeout, searchwindowsize, async_)
  File "/usr/local/lib/python2.7/dist-packages/pexpect/spawnbase.py", line 355, in expect_list
    return exp.expect_loop(timeout)
  File "/usr/local/lib/python2.7/dist-packages/pexpect/expect.py", line 104, in expect_loop
    return self.timeout(e)
  File "/usr/local/lib/python2.7/dist-packages/pexpect/expect.py", line 68, in timeout
    raise TIMEOUT(msg)
pexpect.exceptions.TIMEOUT: Timeout exceeded.
<pexpect.pty_spawn.spawn object at 0x7f5d9c82af90>
command: /usr/bin/ssh
args: ['/usr/bin/ssh', 'myusername@switch1']
buffer (last 100 chars): 'nagement interfaces will not be available during this time.\r\n\r\nAre you sure you want to save? (y/n) '
before (last 100 chars): 'nagement interfaces will not be available during this time.\r\n\r\nAre you sure you want to save? (y/n) '
after: <class 'pexpect.exceptions.TIMEOUT'>
match: None
match_index: None
exitstatus: None
flag_eof: False
pid: 22641
child_fd: 6
closed: False
timeout: 30
delimiter: <class 'pexpect.exceptions.EOF'>
logfile: None
logfile_read: <open file 'mylog.txt', mode 'w' at 0x7f5d9ae0c150>
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
searcher: searcher_re:
    0: re.compile("Are you sure you want to save? (y/n) ")

同样，我认为这与expect“你确定你想保存”行有关，但我不确定。我可以确认登录到开关和其他命令工作，因为我有其他脚本，只是这一个，我不知道。任何帮助都是非常感谢的。

Answer 1

查看日志：

searcher: searcher_re: 0: re.compile("Are you sure you want to save? (y/n) ")

将"Are you sure you want to save? (y/n) "编译为regex将使?, (, / and )成为特殊字符，因此尝试将它们赋值如下：

"Are you sure you want to save\? \(y\/n\) "，它将与文本"Are you sure you want to save? (y/n) "复选这匹配。

因此，将这一行更改为：

child.expect("Are you sure you want to save\? \(y\/n\) ")

Answer 2

Pexpect还支持部分匹配。所以你也可以用，

child.expect('Are you sure you want to save?')