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From: "Frank Millman" <frank@chagford.com>
Subject: Question about asyncio
Date: Fri, 13 Jun 2014 13:42:00 +0200
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Xref: csiph.com comp.lang.python:73262

Hi all

I am trying to get to grips with asyncio, but I don't know if I am doing it 
right.

I have an app that listens for http connections and sends responses. I had 
it working
with cherrypy, which uses threading. Now I am trying to convert it to 
asyncio,
using a package called aiohttp.

I got a basic version working quite quickly, just replacing cherrpy's
request handler with aiohttp's, with a bit of tweaking where required.

Now I want to use the functionality of asyncio by using a 'yield from' to
suspend the currently executing function at a particular point while it
waits for some information. I find that adding 'yield from' turns the
function into a generator, which means that the caller has to iterate over
it. I can avoid that by telling the caller to 'yield from' the generator,
but then *its* caller has to be modified. Now I find I am going through my
entire application and changing every function into a coroutine by
decorating it with @asyncio.coroutine, and changing a simple function call
to a 'yield from'.

So far it is working, but there are dozens of functions to modify, so before
digging too deep a hole for myself I would like to know if this feels like
the right approach.

Thanks

Frank Millman