[Python-Dev] async/await in Python; v2 (original) (raw)

Andrew Svetlov andrew.svetlov at gmail.com
Wed Apr 22 20:53:09 CEST 2015

On Wed, Apr 22, 2015 at 9:45 PM, Yury Selivanov <yselivanov.ml at gmail.com> wrote:

Andrew,

On 2015-04-22 2:32 PM, Andrew Svetlov wrote:

For now I can use mix asyncio.coroutines and async def functions, I mean I can write await f() inside async def to call asyncio.coroutine f and vise versa: I can use yield from g() inside asyncio.coroutine to call async def g(): .... That's another good point that I forgot to add to the list. Thanks for bringing this up.

If we forbid to call async def from regualr code how asyncio should work? I'd like to push async def everywhere in asyncio API where asyncio.coroutine required.

You'll have to use a wrapper that will do the following:

async def foo(): return 'spam' @asyncio.coroutine def bar(): what = yield from foo.await(foo, *args, **kwargs) # OR: what = yield from awaitcall(foo, *args, **kwargs) If I cannot directly use yield from f() with async def f(): then almost every yield from inside asyncio library should be wrapped in await_call(). Every third-party asyncio-based library should do the same.

Also I expect a performance degradation on await_call() calls.

Thanks, Yury

-- Thanks, Andrew Svetlov

More information about the Python-Dev mailing list