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

Yury Selivanov yselivanov.ml at gmail.com
Wed Apr 22 21:24:41 CEST 2015

On 2015-04-22 2:53 PM, Andrew Svetlov wrote:

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

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 awaitcall(). Every third-party asyncio-based library should do the same. Also I expect a performance degradation on awaitcall() calls.

I think there is another way... instead of pushing

GET_ITER ... YIELD_FROM

opcodes, we'll need to replace GET_ITER with another one:

GET_ITER_SPECIAL ... YIELD_FROM

Where "GET_ITER_SPECIAL (obj)" (just a working name) would check that if the current code object has CO_COROUTINE and the object that you will yield-from has it as well, it would push to the stack the result of (obj.await())

Yury

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