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,subprocessfrom time import ctime,sleep,timeimport Queuequeue=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 ab=['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 '#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)