Marco Pagliaricci <pagliaricc...@gmail.com> added the comment:
Chris,
ok, I have modified the snippet of code to better show what I mean.
Still here, the message of the CancelledError exception is lost, but if I
comment line 10, and uncomment line 11, so I throw a ValueError("TEST"),
that "TEST" string will be printed, so the message is not lost.
Again, I just find this behavior very counter-intuitive, and should be VERY
WELL documented in the docs.
Thanks,
M.
On Sat, Oct 9, 2021 at 3:06 PM Chris Jerdonek <rep...@bugs.python.org>
wrote:
>
> Chris Jerdonek <chris.jerdo...@gmail.com> added the comment:
>
> I still don't see you calling asyncio.Task.exception() in your new
> attachment...
>
> ----------
>
> _______________________________________
> Python tracker <rep...@bugs.python.org>
> <https://bugs.python.org/issue45390>
> _______________________________________
>
----------
Added file: https://bugs.python.org/file50334/task_bug.py
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45390>
_______________________________________
import asyncio
async def job():
print("job(): START...")
try:
await asyncio.sleep(5.0)
except asyncio.CancelledError as e:
print("job(): CANCELLED!", e)
raise asyncio.CancelledError("TEST")
#raise ValueError("TEST")
print("job(): DONE.")
async def cancel_task_after(task, time):
try:
await asyncio.sleep(time)
except asyncio.CancelledError:
print("cancel_task_after(): CANCELLED!")
except Exception as e:
print("cancel_task_after(): Exception!", e.__class__.__name__,
e)
task.cancel("Hello!")
async def main():
task = asyncio.create_task(job())
# RUN/CANCEL task.
try:
await asyncio.gather(task, cancel_task_after(task, 1.0))
except asyncio.CancelledError as e:
try:
task_exc = task.exception()
except BaseException as be:
task_exc = be
print("In running task, we encountered a cancellation!
Excpetion message is: ", e)
print(" ^ Task exc is:", task_exc.__class__.__name__,
task_exc)
except Exception as e:
print("In running task, we got a generic Exception:",
e.__class__.__name__, e)
# GET result.
try:
result = task.result()
except asyncio.CancelledError as e:
print("Task has been cancelled, exception message is: ", e)
except Exception as e:
try:
task_exc = task.exception()
except BaseException as be:
task_exc = be
print("Task raised generic exception", e.__class__.__name__, e)
print(" ^ Task exc is:", task_exc.__class__.__name__, task_exc)
else:
print("Task result is: ", result)
if __name__=="__main__":
asyncio.run(main())
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