Chris Jerdonek <chris.jerdo...@gmail.com> added the comment:
I just posted a draft, proof-of-concept PR for one aspect of this issue: https://github.com/python/cpython/pull/19951 Namely, the PR makes it so that cancelled tasks have full tracebacks, all the way to where the code first gets interrupted. I did the C implementation, but I still need to do the pure Python implementation. (Note that it doesn't show where `task.cancel()` was *called*, but rather the first line of code that is cancelled. That other aspect can be handled in a separate PR.) As an example, for this code-- import asyncio async def nested(): await asyncio.sleep(1) async def run(): task = asyncio.create_task(nested()) await asyncio.sleep(0) task.cancel() await task loop = asyncio.new_event_loop() try: loop.run_until_complete(run()) finally: loop.close() Python currently (before the PR) does this: Traceback (most recent call last): File "/.../cpython/test-cancel.py", line 15, in <module> loop.run_until_complete(run()) File "/.../cpython/Lib/asyncio/base_events.py", line 642, in run_until_complete return future.result() asyncio.exceptions.CancelledError With the PR, it looks like this. In particular, you can see that it includes "await asyncio.sleep(1)", as well as the intermediate await: Traceback (most recent call last): File "/.../cpython/test-cancel.py", line 5, in nested await asyncio.sleep(1) File "/.../cpython/Lib/asyncio/tasks.py", line 657, in sleep return await future asyncio.exceptions.CancelledError During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/.../cpython/test-cancel.py", line 11, in run await task asyncio.exceptions.CancelledError During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/.../cpython/test-cancel.py", line 15, in <module> loop.run_until_complete(run()) File "/.../cpython/Lib/asyncio/base_events.py", line 642, in run_until_complete return future.result() asyncio.exceptions.CancelledError ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue31033> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
