New submission from Oleg:
the weird condition in the code
causes the task to end with double exception, hard
to understand what really had happened.
producing output like that:
| i am task..
| i keep working
| Exception in callback Task._step()
| handle: <Handle Task._step()>
| Traceback (most recent call last):
| File "/home/http/Python-3.5.0/lib/python3.5/asyncio/tasks.py", line 239,
in _step
| result = coro.send(value)
| StopIteration
|
| During handling of the above exception, another exception occurred:
|
| Traceback (most recent call last):
| File "/home/http/Python-3.5.0/lib/python3.5/asyncio/events.py", line
125, in _run
| self._callback(*self._args)
| File "/home/http/Python-3.5.0/lib/python3.5/asyncio/tasks.py", line 241,
in _step
| self.set_result(exc.value)
| File "/home/http/Python-3.5.0/lib/python3.5/asyncio/futures.py", line
335, in set_result
| raise InvalidStateError('{}: {!r}'.format(self._state, self))
| asyncio.futures.InvalidStateError: FINISHED: <Task finished coro=<task()
done, defined at test_aio_exception.py:4> exception=RuntimeError('something
bad',)>
it would be good to improve that shutdown procedure
to pinpoint real reason why and when it got into broken state.
additional info can be found here:
https://groups.google.com/forum/#!topic/python-tulip/-EcYtJXDvSo
----------
components: asyncio
files: test_aio_exception.py
messages: 252049
nosy: gvanrossum, haypo, ovex, yselivanov
priority: normal
severity: normal
status: open
title: better Exception message for certain task termination scenario
type: enhancement
versions: Python 3.5
Added file: http://bugs.python.org/file40650/test_aio_exception.py
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<http://bugs.python.org/issue25291>
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