How does async work in Tornado?

Question

Python

There is this code:

import tornado.web
from tornado.ioloop import IOLoop
from tornado import gen
class MainHandler(tornado.web.RequestHandler):
    async def get(self):
        for i in range(5):
            if i == 4:
                print(i)
            await gen.sleep(1)
        print("Lol")
application = tornado.web.Application([
    (r"/test", MainHandler),
    ])
if __name__ == "__main__":
    application.listen(9999)
    IOLoop.instance().start()

I thought that when requested, it would first display "Lol", then count up to 4 and display 4, since async is like await is. What was my surprise when he first counted to 4, printed 4 and only then printed "Lol". I also tried options without async/await but with gen .coroutine. The result is still the same :( I'm new to Tornado, so don't judge too harshly.