asyncio.coroutine and async def are slightly different—not synonyms. The former defines a generator function and the latter defines a coroutine function. Generators and coroutines are very similar in Python (they share lots of code in the CPython implementation) but coroutines are preferred for async programming. Furthermore, yield from (suspend a generator) and await (suspend a coroutine) are also similar but not synonyms.
It is surprising that Python's async syntax isn't tightly bound to its built-in implementation of asynchronous I/O. This was a shrewd decision that—as others have pointed out—permits a variety of event loop implementations. The downside—as you point out—is that there is no built-in function that can drive an async function. On Thu, May 24, 2018 at 8:42 PM, Ken Hilton <kenlhil...@gmail.com> wrote: > On Tue May 22 22:08:40 (-0400), Chris Barker wrote: > > while asyncio is in the standard library, it is not intended to be THE > async event loop implementation > > I'm surprised this is true - with dedicated syntax like async def/await, > it's still not THE async event loop implementation? As far as I know, > "async def" is a shorthand for > > @asyncio.coroutine > def > > and "await" is short for "yield from". > > Sincerely, > Ken Hilton; > > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > >
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