python 3.x - Why don't two sequential coroutines (async functions) execute in parallel? -

so, i'm trying wrap head around async programming (in particular tornado framework), , thought i'd start basics: calling "awaiting" on 2 coroutines:

from tornado.ioloop import ioloop tornado.web import application, url, requesthandler tornado.gen import sleep  class testhandler(requesthandler):         async def get(self):         f1 = await self.test("f1")         f2 = await self.test("f2")         self.write(f1 + " " + f2)      async def test(self, msg):         in range(5):             print(i)             await sleep(1) # tornado's async sleep         return msg  app = application([url(r'/', testhandler)], debug=true) app.listen(8080) ioloop = ioloop.current() ioloop.start() 

the issue, however, when hit localhost:8080 in browser, , stare @ python console, don't see 2 interwoven sequences of 0 1 2 3 4, 2 sequential sequences...

i've read tornado faq over-and-over again , can't seem understand i'm doing wrong.

this runs f1, waits finish, runs f2:

    f1 = await self.test("f1")     f2 = await self.test("f2") 

to run things in parallel, can't await first 1 before starting second. simplest way them both in 1 await:

f1, f2 = await tornado.gen.multi(self.test("f1"), self.test("f2")) 

or in advanced cases, can start f1 without waiting come wait later:

f1_future = tornado.gen.convert_yielded(self.test("f1")) f2_future = tornado.gen.convert_yielded(self.test("f2")) f1 = await f1_future f2 = await f2_future