twisted容易实现多线程，轮询，后台daemon运行

twisted简单实现多线程，轮询，后台daemon运行

from twisted.application import service, internetfrom twisted.internet import reactorimport timei=0def writedata():    global i    i+=1    a=i    print 'waiting to write data     (%d)'%a    time.sleep(8)    print 'writing data!!!!         (%d)'%a    def writeinthread():    reactor.callInThread(writedata)application =service.Application('timeserver')tservice = internet.TimerService(4,writeinthread)tservice.setServiceParent(application )