Python多线程ping检测机器存活（跨平台版）

 由于日常工作经常要回收开发商用完的服务器，之前是用nmap检测开发商有没有关机的，感觉挺麻烦的，今天拿python写了一个脚本专门对付回收服务器的：

原理：把准备回收的机器写入hosts.txt文件里，python脚本读取hosts.txt文件的内容，匹配出里面的ip，然后通过ping测试服务器是否没关机

#!/usr/bin/env python

from threading import Thread
import subprocess
from Queue import Queue
import re
import sys
import platform

num_threads = 10
queue = Queue()

def pinger(i,q):
    while True:
        ip = q.get()
        if platform.system() == "Linux":
            cmd = "ping -c 1 %s" % ip
            outfile = "/dev/null"
        elif platform.system() == "Windows":
            cmd = "ping -n 1 %s" % ip
            outfile = "ping.temp"
        ret = subprocess.call(cmd, shell=True, stdout=open(outfile,'w'), stderr=subprocess.STDOUT)
        if ret == 0:
            print "%s: is alive" % ip
        else:
            print "%s is down" % ip
        q.task_done()

for i in range(num_threads):
    worker = Thread(target=pinger, args=(i, queue))
    worker.setDaemon(True)
    worker.start()


host_file = open(r'hosts.txt','r')
ips = []
re_obj = re.compile(r"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}")
for line in host_file:
    for match in re_obj.findall(line):
        ips.append(match)
host_file.close()


for ip in ips:
    queue.put(ip)

print "Main Thread Waiting"
queue.join()
print "Done"

result = raw_input("Please press any key to exit")
if result:
    sys.exit(0)

小弟初学，请大家多多指点！