多线程获取局域网IP并排序

#coding = utf-8
import os,os.path
import threading
import re
from time import ctime, sleep

lock = threading.RLock()
iplist = []
def action(ip):

    return1 = os.system('ping -n 2 -w 1 %s' % ip)  # 每个ip ping2次，等待时间为1s

    #线程加锁
    lock.acquire()
    if not return1:
        iplist.append(ip)
    lock.release()
    return return1

#多线程代码
def pingfuncthread():
    print('start at', ctime())
    thread_list = []
    for j in range(31,32):
        for i in range(1,255):
            ip = "192.168.%d.%d" %(j,i)
            t = threading.Thread(target=action,args = (ip,))
            #t.setDaemon(True)
            thread_list.append(t)

    for t in thread_list:
        t.start()

    for t in thread_list:
        t.join()
    print('DONE AT:', ctime())

#单线程代码
def pingfunc():

    for i in range(1,255):
        ip = "192.168.31.%d" %(i)
        action(ip)

if __name__ == '__main__':
    pingfuncthread()
    #对获取的ip列表排序
    new_iplist = sorted(iplist,key = lambda x: (int(x.split('.')[0]),int(x.split('.')[1]),int(x.split('.')[2]),int(x.split('.')[3])))
	#写出ip列表
    result = "ip.txt"
    with open(result, 'w') as f:
        for ip in new_iplist:
            f.write("%s\n" % (ip))