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TaskGroup propagates CancelledError rather than a MultiError on exception #34
Description
See the following snippet:
import asyncio
import aiotools
async def error():
await asyncio.sleep(1)
raise Exception("bad stuff")
async def main():
try:
async with aiotools.TaskGroup() as tg:
tg.create_task(error())
await asyncio.sleep(5)
except Exception as e:
print(f"Got inner {repr(e)}")
raise
try:
asyncio.run(main())
except BaseException as e:
print(f"Got outer {repr(e)}")Got outer CancelledError()
Is this expected behavior? It feels wrong, since a) it ate an exception and b) the task wasn't actually cancelled.
This is Python 3.9 and aiotools 1.4.0.
Activity
achimnol commentedon Feb 21, 2022
Let's inspect how python/cpython#31270 handles this...
achimnol commentedon Feb 21, 2022
Also refer https://bugs.python.org/issue46771
achimnol commentedon Feb 27, 2022
I have tested your code with
asyncio.TaskGroupintroduced in Python 3.11 development version.With
aiotools.TaskGroup,It seems to have some problem, definitely. I'll look into more.
Fix "unexpected cancel" when parent is cancelled but needs to continue (