New submission from Martin Teichmann:
when waiting for a gather that times out, everything works as expected, yet a
weird error message is logged. To give a minimal example:
import asyncio
@asyncio.coroutine
def main():
try:
sleep = asyncio.sleep(0.2)
yield from asyncio.wait_for(asyncio.gather(sleep),
timeout=0.1)
except asyncio.TimeoutError:
print("timed out: fine")
yield from asyncio.sleep(0.1)
asyncio.get_event_loop().run_until_complete(main())
This outputs:
timed out: fine
_GatheringFuture exception was never retrieved
future: <_GatheringFuture finished exception=CancelledError()>
concurrent.futures._base.CancelledError
As you can see, I used the pre-3.5 syntax so I could test whether it works on
older systems. No, it doesn't.
I wrote a unit test for this problem, unfortunately I couldn't solve it yet.
----------
components: asyncio
messages: 286858
nosy: Martin.Teichmann, gvanrossum, yselivanov
priority: normal
pull_requests: 24
severity: normal
status: open
title: wait_for(gather(...)) logs weird error message
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29432>
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