Why can't I 'yield from' inside an async function?
According to PEP 525, which introduces asyncronous generators in Python 3.6:
Asynchronous
yield fromWhile it is theoretically possible to implement
yield fromsupport for asynchronous generators, it would require a serious redesign of the generators implementation.
yield fromis also less critical for asynchronous generators, since there is no need provide a mechanism of implementing another coroutines protocol on top of coroutines. And to compose asynchronous generators a simpleasync forloop can be used:async def g1(): yield 1 yield 2async def g2(): async for v in g1(): yield v
As you can see, the answer boils down to "it would be too hard to implement, and you don't need it anyway".