一、安装easy_install工具
wget http://peak.telecommunity.com/dist/ez_setup.py
python ez_setup.py 安装easy_install工具（这个脚本会自动去官网搜索下载并安装）
python  ez_setup.py  -U setuptools  升级easy_install工具

二、安装pexpect
easy_install Pexpect

测试一下:
[root@OMS python]# python
Python 2.7.3rc1 (default, Nov  7 2012, 15:03:45)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pexpect
>>> import pxssh
>>>

ok已经安装完成。
三、写一个脚本给远程服务器发送命令，并返回结果。

脚本内容:

#!/usr/bin/python
#2013-01-16 by larry
import pexpect
def login(port,user,passwd,ip,command):
    child=pexpect.spawn('ssh -p%s %s@%s "%s"' %(port,user,ip,command))
    o=''
    try:
        i=child.expect(['[Pp]assword:','continue connecting (yes/no)?'])
        if i == 0: 
            child.sendline(passwd)
        elif i == 1:
            child.sendline('yes')
        else:
            pass
    except pexpect.EOF:
        child.close()
    else:
        o=child.read()
        child.expect(pexpect.EOF)
        child.close()
    return o

hosts=file('hosts.list','r')
for line in hosts.readlines():
    host=line.strip("\n")
    if host:
        ip,port,user,passwd,commands= host.split(":")
        for command in commands.split(","):
            print "+++++++++++++++ %s run:%s ++++++++++++" % (ip,command),
            print login(port,user,passwd,ip,command)   
hosts.close()

使用方法:python scripts.py

host.list文件内容如下:

192.168.0.21:22999:root:123456:cat /etc/redhat-release,df -Th,whoami
192.168.0.21:22999:root:123456:cat /etc/redhat-release,df -Th,whoami

返回结果:
+++++++++++++++ 192.168.0.21 run:cat /etc/redhat-release ++++++++++++  
Red Hat Enterprise Linux Server release 4

+++++++++++++++ 192.168.0.21 run:df -Th ++++++++++++  
文件系统      类型    容量  已用 可用 已用% 挂载点
/dev/cciss/c0d0p6
              ext3    5.9G  4.4G  1.2G  80% /
/dev/cciss/c0d0p7
              ext3    426G  362G   43G  90% /opt
/dev/cciss/c0d0p5
              ext3    5.9G  540M  5.0G  10% /var
/dev/cciss/c0d0p3
              ext3    5.9G  4.1G  1.5G  74% /usr
/dev/cciss/c0d0p1
              ext3    487M   17M  445M   4% /boot
tmpfs        tmpfs    4.0G     0  4.0G   0% /dev/shm

+++++++++++++++ 192.168.0.21 run:whoami ++++++++++++  
root