使用tornado实现定时执行任务详解程序员

使用tornado实现轮询：

from tornado import web, ioloop 
import datetime 
 
class MainHandler(web.RequestHandler): 
    def get(self): 
        self.write('Hello Tornado') 
 
def f2s(): 
    print '2s ', datetime.datetime.now() 
 
def f5s(): 
    print '5s ', datetime.datetime.now() 
 
if __name__ == '__main__': 
    application = web.Application([ 
        (r'/', MainHandler), 
        ]) 
    application.listen(8081) 
    ioloop.PeriodicCallback(f2s, 2000).start()  # start scheduler 每隔2s执行一次f2s 
    ioloop.PeriodicCallback(f5s, 5000).start()  # start scheduler 
    ioloop.IOLoop.instance().start()