标题：pexpect 使用范例
出处：Felix021
时间：Wed, 31 Oct 2012 10:13:06 +0000
作者：felix021
地址：https://www.felix021.com/blog/read.php?2097

内容：
在shell里头，有些程序（比如ssh）的交互是从pty中读取的数据，直接的重定向无法解决，因此需要用到expect这种东西。不过这货的编译比较麻烦，各种依赖。幸好有个pexpect是纯python的，存档留个记录。
#!/usr/bin/python

import sys
import pexpect

password = 'password'
expect_list = ['(yes/no)', 'password:']

p = pexpect.spawn('ssh username@localhost ls')
try:
    while True:
        idx = p.expect(expect_list)
        print p.before + expect_list[idx],
        if idx == 0:
            print "yes"
            p.sendline('yes')
        elif idx == 1:
            print password
            p.sendline(password)
except pexpect.TIMEOUT:
    print >>sys.stderr, 'timeout'
except pexpect.EOF:
    print p.before


如果密码错误的话，输出引用
The authenticity of host 'localhost (127.0.0.1)' can't be established.
RSA key fingerprint is fe:00:00::00:00:00:00:00:00:00:00:00:00:00:00.
Are you sure you want to continue connecting ((yes/no) yes
)? yes
Warning: Permanently added 'localhost' (RSA) to the list of known hosts.
username@localhost's password: password
 
Permission denied, please try again.
username@localhost's password: password
 
Permission denied, please try again.
username@localhost's password: password
 
Permission denied (publickey,gssapi-with-mic,password).



如果正确，则输出引用
username@localhost's password: password
 
a
b
bin
code




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