Tornado - Coroutines Time Delay&Sleep Example

TornadoCoroutines.py

import time

import tornado.web
from tornado.ioloop import IOLoop
from tornado import gen

from tornado.options import define, options, parse_command_line

define("port", default=8888, help="run on the given port", type=int)


@gen.coroutine
def async_sleep(seconds):
    yield gen.Task(IOLoop.instance().add_timeout, time.time() + seconds)


class MainHandler(tornado.web.RequestHandler):
    @gen.coroutine
    def get(self):
        for i in range(100):
            print i
            yield async_sleep(0.5)
        self.write(str(i))
        self.finish()

def main():
    parse_command_line()
    app = tornado.web.Application([
        (r"/", MainHandler),
    ],  
        cookie_secret="01234",
        template_path=os.path.join(os.path.dirname(__file__), "templates"),
        static_path=os.path.join(os.path.dirname(__file__), "static"),
        xsrf_cookies=True,  
    )
    app.listen(options.port)
    tornado.ioloop.IOLoop.current().start()


if __name__ == "__main__":
    main()