iscoroutine() is usually used to turn something into a Future. Is that what you want? (TBH I'm not sure why you're asking all this.)
On Thu, Nov 2, 2017 at 7:49 PM, Chris Jerdonek <chris.jerdo...@gmail.com> wrote: > Thanks. And how about making asyncio.iscoroutine() return True for the > return value? It looks like asyncio calls that one in a half-dozen places > or so. > > —Chris > > On Thu, Nov 2, 2017 at 7:15 PM Guido van Rossum <gu...@python.org> wrote: > >> Re (1), there are only two places where asyncio calls >> `iscouroutinefunction()`, and in both cases it raises a TypeError to remind >> the user that a coroutine/awaitable object is required. So, it doesn't >> really offer much of an advantage and I wouldn't worry about it. >> >> On Thu, Nov 2, 2017 at 4:51 PM, Chris Jerdonek <chris.jerdo...@gmail.com> >> wrote: >> >>> Hi, >>> >>> I have a 2-part question: >>> >>> 1) Say you have a function that returns an awaitable (but not a >>> coroutine object). Are there any advantages or disadvantages to >>> replacing this with a function for which asyncio.iscoroutinefunction() >>> returns True and asyncio.iscoroutine() returns True for the return >>> value? An advantage might be, say, additional checks that asyncio >>> performs. >>> >>> 2) If there are advantages, is there a straightforward way to >>> construct such a replacement? In the case I have in mind (from an open >>> source project), the "function" you'd be starting with is the class >>> constructor for an async context manager that is also awaitable. So >>> the class has both __aenter__ and __await__ methods. >>> >>> As an example naive attempt, the following _wouldn't_ work: >>> >>> @asyncio.coroutine >>> def connect(): >>> return AsyncConnectManager() >>> >>> The reason this doesn't work is that wrapping connect() in >>> @asyncio.coroutine() means the return value is no longer an async >>> context manager (it no longer has an __aenter__ method). You have to >>> await to get the underlying async context manager. >>> >>> Thanks, >>> --Chris >>> >> _______________________________________________ >>> Async-sig mailing list >>> Async-sig@python.org >>> https://mail.python.org/mailman/listinfo/async-sig >>> Code of Conduct: https://www.python.org/psf/codeofconduct/ >>> >> >> >> >> -- >> --Guido van Rossum (python.org/~guido) >> > -- --Guido van Rossum (python.org/~guido)
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