Hi Yury,
I was playing with your implementation to gain a better understanding of
the operation of asend() and friends. Since I was explicitly trying to
"manually" advance the generators, I wasn't using asyncio or other event
loop. This meant that the first thing I ran into with my toy code was the
RuntimeError ("cannot iterate async generator without finalizer set").
As you have argued elsewhere, in practice the finalizer is likely to be set
by the event loop. Since the authors of event loops are likely to know that
they should set the finalizer, would it perhaps be acceptable to merely
issue a warning instead of an error if the finalizer is not set? That way
there isn't an extra hoop to jump through for simple examples.
In my case, I just called
sys.set_asyncgen_finalizer(lambda g: 1)
to get around the error and continue playing :) (I realize that's a bad
thing to do but it didn't matter for the toy cases)
- Rajiv
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