New submission from Ian Kelly:
I was playing around with this class for adapting regular iterators to async
iterators using BaseEventLoop.run_in_executor:
import asyncio
class AsyncIteratorWrapper:
def __init__(self, iterable, loop=None, executor=None):
self._iterator = iter(iterable)
self._loop = loop or asyncio.get_event_loop()
self._executor = executor
async def __aiter__(self):
return self
async def __anext__(self):
try:
return await self._loop.run_in_executor(
self._executor, next, self._iterator)
except StopIteration:
raise StopAsyncIteration
Unfortunately this fails because when next raises StopIteration,
run_in_executor swallows the exception and just returns None back to the
coroutine, resulting in an infinite iterator of Nones.
----------
components: asyncio
messages: 259036
nosy: gvanrossum, haypo, ikelly, yselivanov
priority: normal
severity: normal
status: open
title: asynco run_in_executor swallows StopIteration
versions: Python 3.5
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Python tracker <[email protected]>
<http://bugs.python.org/issue26221>
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