[issue17005] Add a topological sort algorithm
gaborbernat added the comment: I like graphutils for what it's worth. -- ___ Python tracker <https://bugs.python.org/issue17005> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40726] ast.Call end_lineno is defined and returns None
New submission from gaborbernat : Reporting an issue from https://github.com/xonsh/xonsh/issues/3581; boils down to, ast.Call used to not define end_lineno in 3.8: py -3.8 -c 'import ast; type(ast.Call().end_lineno)' Traceback (most recent call last): File "", line 1, in AttributeError: 'Call' object has no attribute 'end_lineno' However in 3.9 is defined with None: py -3.9 -c 'import ast; type(ast.Call().end_lineno)' This messes with some other operations in ast, namely https://github.com/python/cpython/blob/master/Lib/ast.py#L233 -- messages: 369567 nosy: gaborbernat priority: normal severity: normal status: open title: ast.Call end_lineno is defined and returns None versions: Python 3.9 ___ Python tracker <https://bugs.python.org/issue40726> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40536] Addition of a "list of available time zones" function to zoneinfo
gaborbernat added the comment: I think semantically the correct expression would be available timezones, free function, set and no cache. Document the operation is expensive and users should cache if they want repeated access or provide an available timezones cached function my 2c -- nosy: +gaborbernat ___ Python tracker <https://bugs.python.org/issue40536> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40615] unstable behaviour for options in argparse
gaborbernat added the comment: I did not, nm then. Thanks for the link. -- ___ Python tracker <https://bugs.python.org/issue40615> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40615] unstable behaviour for options in argparse
Change by gaborbernat : -- title: argparse -> unstable behaviour for options in argparse ___ Python tracker <https://bugs.python.org/issue40615> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40615] argparse
New submission from gaborbernat :
Consider the following code:
from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument("--clear-magic", action="store_true")
print(parser.parse_args(["--clear"]))
parser.add_argument("--clear", action="store_true")
print(parser.parse_args(["--clear"]))
This has the following output:
Namespace(clear_magic=True)
Namespace(clear=True, clear_magic=False)
I find it surprising and confusing why the clear magic option is accepted when
clear is not defined. I'm tempted to say it's a bug. This unstable behaviour is
very surprising when iteratively building up the parser.
Discovered with
https://github.com/pypa/virtualenv/issues/1824#issuecomment-627919033
--
messages: 368776
nosy: gaborbernat
priority: normal
severity: normal
status: open
title: argparse
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[issue25625] "chdir" Contex manager for pathlib
gaborbernat added the comment: So moving way from subprocess.Process; what about having this for other use cases? I know there is no thread-safe way to get this working, given it's a process state variable. However, can we have it as a non-thread-safe feature? -- nosy: +gaborbernat versions: +Python 3.9 -Python 3.6 ___ Python tracker <https://bugs.python.org/issue25625> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40335] Regression in multiline SyntaxError offsets
Change by gaborbernat : -- nosy: +gaborbernat ___ Python tracker <https://bugs.python.org/issue40335> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue40238] os.stat() on Windows succeeds for nonexistent paths with trailing spaces
gaborbernat added the comment: While I agree that Windows is safe to transform paths as he wishes to, the bug reported here is that os.stat/os.path.isdir behaves differently than os.scandir. Can we make them behave the same? -- nosy: +gaborbernat ___ Python tracker <https://bugs.python.org/issue40238> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue39675] forked process in multiprocessing does not honour atexit
New submission from gaborbernat :
I've talked with Pablo about this in person, and as advised opening the issue
here now.
I've discovered that forked processes do not honour atexit registrations. See
the following example code:
from multiprocessing import Process, set_start_method
import time
import os
import atexit
def cleanup():
print(f"cleanup {os.getpid()}")
atexit.register(cleanup)
def run():
time.sleep(0.1)
print(f"process done {os.getpid()}")
# atexit._run_exitfuncs()
if __name__ == "__main__":
set_start_method("fork")
process = Process(target=run)
process.start()
process.join()
print("app finished")
In case of a forked process childs the atexit is never executed (note it works
if I ran them manually at the end of the child process; so they're registered
correctly). Switching to spawn method makes it work as expected. The behaviour
is the same even if you call register within the child process (as opposed to
being inherited during forking). Also found this StackOverflow question that
mentions this https://stackoverflow.com/a/26476585. At the very least the
documentation should explain this; though I'd expect atexit to be called before
finalization of the fork processes (assuming the child process exits with 0
exit code). d
--
messages: 362197
nosy: davin, gaborbernat, pablogsal, pitrou
priority: normal
severity: normal
status: open
title: forked process in multiprocessing does not honour atexit
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[issue17005] Add a topological sort algorithm
gaborbernat added the comment: I think the new interface feeds better for usage in both sequential or parallel workflows, which means we can use a single UI for both, so from myself -- nosy: +gaborbernat ___ Python tracker <https://bugs.python.org/issue17005> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue39360] python3.8 regression - ThreadPool join via __del__ hangs forever
gaborbernat added the comment: Reported the issue downstream too under https://github.com/swagger-api/swagger-codegen/issues/9991 -- ___ Python tracker <https://bugs.python.org/issue39360> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue39360] python3.8 regression - ThreadPool join via __del__ hangs forever
gaborbernat added the comment: An FYI update, the code is used by swagger-codegen to generate HTTP clients (https://github.com/swagger-api/swagger-codegen/blob/master/modules/swagger-codegen/src/main/resources/python/api_client.mustache#L73). The example below basically replicates creating such client as a global. -- ___ Python tracker <https://bugs.python.org/issue39360> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue39360] python3.8 regression - ThreadPool join via __del__ hangs forever
Change by gaborbernat : -- nosy: +pablogsal ___ Python tracker <https://bugs.python.org/issue39360> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue39360] python3.8 regression - ThreadPool join via __del__ hangs forever
New submission from gaborbernat : Assume the following code: ```python from multiprocessing.pool import ThreadPool class A(object): def __init__(self): self.pool = ThreadPool() def __del__(self): self.pool.close() self.pool.join() a = A() print(a) ``` The code snippet above hangs forever on Python 3.8+ (works ok on Python 3.7 and earlier). An example output where I've added some extra prints on to the thread joins: ``` <__main__.A object at 0x1104d6070> join thread None done join thread None done join thread None done join thread None done join thread None done join thread None done join thread None done join thread None done join thread None done join thread None done join thread None ``` I've tested on MacOs, but could replicate on Linux too within the CI. -- components: Library (Lib) messages: 360119 nosy: gaborbernat, vstinner priority: normal severity: normal status: open title: python3.8 regression - ThreadPool join via __del__ hangs forever versions: Python 3.8, Python 3.9 ___ Python tracker <https://bugs.python.org/issue39360> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37369] Issue with pip in venv on Powershell in Windows
gaborbernat added the comment: A note on the above points, virtualenv has started migrating over to venv via https://github.com/pypa/virtualenv/pull/1377 . Following this, the old ways of virtualenv should be left to the history books. Hopefully, I can get it out within the next month or so. -- nosy: +gaborbernat ___ Python tracker <https://bugs.python.org/issue37369> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21822] KeyboardInterrupt during Thread.join hangs that Thread
gaborbernat added the comment: I think I'm hitting this with subprocesses inside tox (parallel feature), any plans to fix this? -- nosy: +gaborbernat ___ Python tracker <https://bugs.python.org/issue21822> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
