[issue43890] Deadlock when mixing event loops and subprocesses
New submission from Thomas Buhrmann : When mixing code that spawns subprocesses with code that creates event loops, Python appears to deadlock. In the attached example, when WORKERS = 16 and ASYNC_WORKERS = 8, Python will sometimes (50% of the time?) deadlock, never exiting, with no exceptions raised. Oddly, if ASYNC_WORKERS is set to 0 or 16 (i.e., only subprocesses or only event loops), it runs reliably. I tested this in an x86_64 Ubuntu 20.04.2 VM with Python 3.8.6. I was only able to reproduce it when the VM had more than one CPU, and I was unable to reproduce it on x86_64 MacOS. -- files: subprocess_asyncio_deadlock.py messages: 391386 nosy: thomas priority: normal severity: normal status: open title: Deadlock when mixing event loops and subprocesses type: behavior versions: Python 3.8 Added file: https://bugs.python.org/file49967/subprocess_asyncio_deadlock.py ___ Python tracker <https://bugs.python.org/issue43890> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue36497] Undocumented behavior in csv.Sniffer (preferred delimiters)
New submission from Thomas Buhrmann : When the Sniffer detects more than one possible delimiter, as e.g. in the following file "a;b;c;d,e;f;g;h" the result will always be the ',' delimiter, independent of how "dominant" another delimiter is. This is because the codepath analyzing dominance will only get executed if the undocumented Sniffer member Sniffer.preferred is overwritten by the user after initialization. While not strictly a bug, the behavior should probably be documented, and the 'preferred' member could be exposed as an argument in __init__() perhaps? -- components: Library (Lib) messages: 339291 nosy: thomas priority: normal severity: normal status: open title: Undocumented behavior in csv.Sniffer (preferred delimiters) type: behavior versions: Python 3.7 ___ Python tracker <https://bugs.python.org/issue36497> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
