Ian Kelly added the comment:
The idea is that the wrapped iterator is something potentially blocking, like a
database cursor that doesn't natively support asyncio. Usage would be something
like this:
async def get_data():
cursor.execute('select * from stuff')
async for row in AsyncIteratorWrapper(cursor):
process(row)
Investigating this further, I think the problem is actually in await, not
run_in_executor:
>>> async def test():
... fut = asyncio.Future()
... fut.set_exception(StopIteration())
... print(await fut)
...
>>> loop.run_until_complete(test())
None
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<http://bugs.python.org/issue26221>
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