bpo-45390: Propagate CancelledError's message from cancelled task to its awaiter by asvetlov · Pull Request #31383 · python/cpython (original) (raw)

Test added.

import asyncio

async def job():
    # raise RuntimeError('error!')
    await asyncio.sleep(5)

async def main():
    task = asyncio.create_task(job())
    await asyncio.sleep(1)
    task.cancel('cancel job')
    await task

if __name__=="__main__":
    asyncio.run(main())

Traceback (most recent call last):
  File "/home/andrew/projects/cpython/exc_traceback.py", line 14, in <module>
    asyncio.run(main())
    ^^^^^^^^^^^^^^^^^^^
  File "/home/andrew/projects/cpython/Lib/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/andrew/projects/cpython/Lib/asyncio/base_events.py", line 640, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/home/andrew/projects/cpython/exc_traceback.py", line 11, in main
    await task
    ^^^^^^^^^^
  File "/home/andrew/projects/cpython/exc_traceback.py", line 5, in job
    await asyncio.sleep(5)
    ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/andrew/projects/cpython/Lib/asyncio/tasks.py", line 619, in sleep
    return await future
           ^^^^^^^^^^^^
asyncio.exceptions.CancelledError: cancel job