Tornado server with multiple periodic callbacks and a repeated background task

tornado_periodic.py

# python
import logging
import time

from tornado import gen, httpserver, ioloop, log, web

log.enable_pretty_logging()


class MainHandler(web.RequestHandler):
    @gen.coroutine
    def get(self):
        ioloop.IOLoop.instance().spawn_callback(callback)
        self.write("DONE\n")


@gen.coroutine
def callback():
    print("\nCalback has completed\n")


@gen.coroutine
def small_loop():
    while True:
        yield print('\nin small loop!\n')
        yield gen.sleep(10)


def make_app():
    return web.Application([
        (r"/", MainHandler)
    ],
        debug=False)


def main():
    """Make application"""

    app = make_app()

    # start server
    server = httpserver.HTTPServer(app)
    server.listen(8080)
    # server.start()
    # app.listen(8080)

    ioloop.IOLoop.instance().spawn_callback(small_loop)

    io_loop = ioloop.IOLoop.instance()

    # background update every x seconds
    task = ioloop.PeriodicCallback(
            lambda: print('period'),
            2000)
    task.start()

    print('starting ioloop')
    io_loop.start()

if __name__ == "__main__":
    main()