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Issue32684

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classification
Title:asyncio.gather(..., return_exceptions=True) swallows cancellation
Type:behaviorStage:resolved
Components:asyncioVersions:Python 3.8, Python 3.7, Python 3.6
process
Status:closedResolution:fixed
Dependencies:Superseder:
Assigned To:Nosy List: asvetlov, r.david.murray, socketpair, yselivanov
Priority:normalKeywords:patch

Created on2018-01-27 05:38 bysocketpair, last changed2022-04-11 14:58 byadmin. This issue is nowclosed.

Pull Requests
URLStatusLinkedEdit
PR 7209mergedyselivanov,2018-05-29 16:52
PR 7222mergedmiss-islington,2018-05-29 21:21
PR 7224mergedyselivanov,2018-05-29 21:44
PR 7225mergedyselivanov,2018-05-29 21:52
PR 7231mergedmiss-islington,2018-05-29 23:22
Messages (8)
msg310843 -(view)Author: Марк Коренберг (socketpair)*Date: 2018-01-27 05:38
Proof:================import asyncioasync def test():    while True:        print('sleeping 1')        await asyncio.gather(asyncio.sleep(1), return_exceptions=True)async def amain():    print('creating task')    qwe = asyncio.Task(test())    print('sleeping 2')    await asyncio.sleep(2)    print('cancelling task')    qwe.cancel()    print('waiting task for completion')    try:        await qwe    except Exception as e:        print('task complete: %r', e)loop = asyncio.get_event_loop()loop.run_until_complete(amain())================This program will never complete.This case should be either fixed, or documented.
msg310846 -(view)Author: R. David Murray (r.david.murray)*(Python committer)Date: 2018-01-27 07:04
See alsoissue 26923, but I think this problem is different.
msg318059 -(view)Author: Yury Selivanov (yselivanov)*(Python committer)Date: 2018-05-29 16:57
Thanks for reporting this. Agree, this is a bug and makes it hard (if not impossible) to use gather.  I've created a PR to address the issue.
msg318093 -(view)Author: Yury Selivanov (yselivanov)*(Python committer)Date: 2018-05-29 21:20
New changeset863b6749093a86810c4077112a857363410cc221 by Yury Selivanov in branch 'master':bpo-32684: Fix gather to propagate cancel of itself with return_exceptions (GH-7209)https://github.com/python/cpython/commit/863b6749093a86810c4077112a857363410cc221
msg318127 -(view)Author: Yury Selivanov (yselivanov)*(Python committer)Date: 2018-05-29 22:29
New changeset036434273e6f6905403432c973d98ade1ae58197 by Yury Selivanov (Miss Islington (bot)) in branch '3.7':bpo-32684: Fix gather to propagate cancel of itself with return_exceptions (GH-7209) (#7222)https://github.com/python/cpython/commit/036434273e6f6905403432c973d98ade1ae58197
msg318138 -(view)Author: Yury Selivanov (yselivanov)*(Python committer)Date: 2018-05-29 23:20
New changeset3b263e65a80cfcb1fc751834372533773ec024a4 by Yury Selivanov in branch '3.6':bpo-32684: Fix gather to propagate cancel of itself with return_exceptions (GH-7224)https://github.com/python/cpython/commit/3b263e65a80cfcb1fc751834372533773ec024a4
msg318139 -(view)Author: Yury Selivanov (yselivanov)*(Python committer)Date: 2018-05-29 23:20
New changeset6f75bae74866b6acf638e3aa610d830d55b7e314 by Yury Selivanov in branch 'master':bpo-32684: Fix nits in tests (GH-7225)https://github.com/python/cpython/commit/6f75bae74866b6acf638e3aa610d830d55b7e314
msg318142 -(view)Author: Yury Selivanov (yselivanov)*(Python committer)Date: 2018-05-30 00:40
New changeset3ddee64587482082fcbab930ff82ed67aa9f4a0d by Yury Selivanov (Miss Islington (bot)) in branch '3.7':bpo-32684: Fix nits in tests (GH-7225) (#7231)https://github.com/python/cpython/commit/3ddee64587482082fcbab930ff82ed67aa9f4a0d
History
DateUserActionArgs
2022-04-11 14:58:57adminsetgithub: 76865
2018-05-30 00:59:24yselivanovsetstatus: open -> closed
resolution: fixed
stage: patch review -> resolved
2018-05-30 00:40:59yselivanovsetmessages: +msg318142
2018-05-29 23:22:14miss-islingtonsetpull_requests: +pull_request6863
2018-05-29 23:20:28yselivanovsetmessages: +msg318139
2018-05-29 23:20:04yselivanovsetmessages: +msg318138
2018-05-29 22:29:14yselivanovsetmessages: +msg318127
2018-05-29 21:52:43yselivanovsetpull_requests: +pull_request6857
2018-05-29 21:44:43yselivanovsetpull_requests: +pull_request6856
2018-05-29 21:21:22miss-islingtonsetpull_requests: +pull_request6853
2018-05-29 21:20:11yselivanovsetmessages: +msg318093
2018-05-29 16:57:32yselivanovsetversions: - Python 3.5
2018-05-29 16:57:20yselivanovsetmessages: +msg318059
2018-05-29 16:52:43yselivanovsetkeywords: +patch
stage: patch review
pull_requests: +pull_request6844
2018-01-27 07:04:29r.david.murraysetnosy: +r.david.murray
messages: +msg310846
2018-01-27 05:38:11socketpaircreate
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