python多线程获取局域网内所有电脑IP

#coding = utf-8
import os,os.path
import threading
import time

lock = threading.RLock()
def action(ip):
    result = "ip.txt"
    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()
    with open(result, 'a+') as f:
        if not return1:
            f.write("result:%d %s\n" % (return1, ip))
    lock.release()
    return return1
#多线程代码
def pingfuncthread():

    thread_list = []
    for j in range(1,255):
        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()
#单线程代码
def pingfunc():

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

if __name__ == '__main__':
    pingfunc()
    #run_plot("test.txt")