需要ping一个网段所有机器的在线情况，shell脚步运行时间太长，用python写个多线程ping吧，代码如下：

#!/usr/bin/python
#coding=utf-8
\'\'\'
Created on 2015-8-4
@author: Administrator
\'\'\'

import threading,subprocess
from time import ctime,sleep,time
import Queue

queue=Queue.Queue()

class ThreadUrl(threading.Thread):
  def __init__(self,queue):
    threading.Thread.__init__(self)
    self.queue=queue

  def run(self):
    while True:
      host=self.queue.get()
      ret=subprocess.call(\'ping -c 1 -w 1 \'+host,shell=True,stdout=open(\'/dev/null\',\'w\'))
      if ret:
        print \"%s is down\" % host
      else:
        print \"%s is up\" % host
      self.queue.task_done()

def main():
  for i in range(100):
    t=ThreadUrl(queue)
    t.setDaemon(True)
    t.start()
  for host in b:
    queue.put(host)
  queue.join()

a=[]
with open(\'ip.txt\') as f:
  for line in f.readlines():
    a.append(line.split()[0])
  #print a

b=[\'192.168.3.\'+str(x) for x in range(1,254)] #ping 192.168.3 网段
start=time()
main()
print \"Elasped Time:%s\" % (time()-start)

#t2=threading.Thread(target=move,args=(\'fff\',))
#threads.append(t2)

\'\'\'
for i in a:
  print ctime()
  ping(i)
  sleep(1)

if __name__ == \'__main__\':
  for t in range(len(a)):
    #t.setDaemon(True)
    threads[t].start()
    #t.join()
  print \"All over %s\" % ctime()
\'\'\'

效果如下：

平一个网段只要2.7s左右，够快！！！

再给大家分享一个检测外网服务器的方法及代码

经常使用python检测服务器是否能ping通, 程序是否正常运行（检测对应的端口是否正常）

    以前使用shell脚本的写法如下：

    PINGRET=$( ping www.baidu.com -c 2 | grep \”icmp_\” );  if [ -z $PINGRET ]; then echo \”ping fail\”; else echo \”ping ok\”; fi

    或者

     ping -c 2 www.baidu.com|grep \”icmp_\” && echo \’ping ok\’ || echo \’ping fail\’

    代码示例：

#!/usr/bin/python
# encoding=utf-8
# Filename: net_is_normal.py
import os
import socket
import subprocess
 
 
#判断网络是否正常
server=\'www.baidu.com\'
#检测服务器是否能ping通，在程序运行时，会在标准输出中显示命令的运行信息
def pingServer(server):
  result=os.system(\'ping \'+server+\' -c 2\')
  if result:
    print \'服务器%s ping fail\' % server
  else:
    print \'服务器%s ping ok\' % server
  print result
 
#把程序输出定位到/dev/null,否则会在程序运行时会在标准输出中显示命令的运行信息 
def pingServerCall(server):
  fnull = open(os.devnull, \'w\')
  result = subprocess.call(\'ping \'+server+\' -c 2\', shell = True, stdout = fnull, stderr = fnull)
  if result:
    print \'服务器%s ping fail\' % server
  else:
    print \'服务器%s ping ok\' % server
  fnull.close()
   
#可用于检测程序是否正常，如检测redis是否正常，即检测redis的6379端口是否正常
#检测ssh是否正常，即检测ssh的22端口是否正常
def check_aliveness(ip, port):
  sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  sk.settimeout(1)
  try:
    sk.connect((ip,port))
    print \'server %s %d service is OK!\' %(ip,port)
    return True
  except Exception:
    print \'server %s %d service is NOT OK!\' %(ip,port)
    return False
  finally:
    sk.close()
  return False
   
if __name__==\'__main__\':
  pingServerCall(server)
  pingServer(server)
  check_aliveness(\'192.168.230.128\', 6379)