Python ping 检查机器健康状态

今天群里有个童鞋问到我想用python来写一个ping检查多台主机健康状态的一个脚本，还真没写过。然后我就试着写了一下，因为我的python也属于学习阶段所以
还是要借助于好多资料才写成的,当然里面还需要有好多的优化，只是简单的实现了,还请各位多多指出问题，多谢！

新增了一个打开要检查文件列表的功能,输入你要检查的机器的列表文件名.
代码:

#!/usr/bin/env python
#Auther:XaoSa
import os,sys,re
import subprocess
def runCheck(source):
    file_obj = open(source)
    for host in file_obj.readlines():
        host = host.strip('\n')
        p = subprocess.Popen(["ping -c 1 "+ host],
                            stdin = subprocess.PIPE,
                            stdout = subprocess.PIPE,
                            stderr = subprocess.PIPE,
                            shell = True)
        out = p.stdout.read()
        regex = re.compile("time=\d*", re.IGNORECASE | re.MULTILINE)
        if len(regex.findall(out)) > 0:
            print host+': Host Up!'
        else:
            print host+': Host Down!'

def Usage():
    print """ ---Need to enter an absolute path---
---(The current directory except)---"""

while True:
    Usage()
    source = raw_input('Please input your check_host_list_file:')
    if os.path.exists(source):
        runCheck(source)
        exit()

    elif source == 'ls':
        print '--------List current directory--------'
        os.system('ls')

    else:
        print "Sorry your check_host_list_file not exist!"

192.168.3.88 :Host up!
192.168.3.12 :Host up!
192.168.3.123 :Host down!
192.168.3.44 :Host up!