#!/usr/bin/python

import time
import thread

LISTA = '/home/test.txt'


def abcd1():
    global LISTA
    while true:
        with open(LISTA,'a') as file:
            file.write('<1>')
            if '<2>' in LISTA:
                file.close

def abcd2():
    global LISTA
    while true:
        with open(LISTA,'a') as file:
            file.write('<2>')
            if '<1>' in LISTA:
                file.close


thread.start_new(abcd1, ())
thread.start_new(abcd2, ())