[issue45855] PyCapsule_Import still using PyImport_ImportModuleNoBlock

[Kumar Aditya]

Change by Kumar Aditya :


--
nosy: +kumaraditya303
nosy_count: 2.0 -> 3.0
pull_requests: +28271
pull_request: https://github.com/python/cpython/pull/30046

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[issue46045] NetBSD: do not use POSIX semaphores

[Thomas Klausner]

New submission from Thomas Klausner :

On NetBSD by default, the following tests do not finish in > 1h:

1:07:13 load avg: 0.00 running: test_compileall (1 hour 7 min), 
test_multiprocessing_fork (1 hour 7 min), test_concurrent_futures (1 hour 6 min)

Defining HAVE_BROKEN_POSIX_SEMAPHORES fixes this, and they finish:

0:00:32 load avg: 10.63 [408/427/17] test_compileall passed ...
...
0:02:37 load avg: 3.04 [427/427/22] test_concurrent_futures passed (2 min 33 
sec)

The last one fails:
test_multiprocessing_fork

with most of the subtests failing like this:

ERROR: test_shared_memory_SharedMemoryServer_ignores_sigint 
(test.test_multiprocessing_fork.WithProcessesTestSharedMemory)
--
Traceback (most recent call last):
  File 
"/scratch/lang/python310/work/Python-3.10.1/Lib/test/_test_multiprocessing.py", 
line 4006, in test_shared_memory_SharedMemoryServer_ignores_sigint
sl = smm.ShareableList(range(10))
  File 
"/scratch/lang/python310/work/Python-3.10.1/Lib/multiprocessing/managers.py", 
line 1372, in ShareableList
sl = shared_memory.ShareableList(sequence)
  File 
"/scratch/lang/python310/work/Python-3.10.1/Lib/multiprocessing/shared_memory.py",
 line 327, in __init__
self.shm = SharedMemory(name, create=True, size=requested_size)
  File 
"/scratch/lang/python310/work/Python-3.10.1/Lib/multiprocessing/shared_memory.py",
 line 92, in __init__
self._fd = _posixshmem.shm_open(
OSError: [Errno 86] Not supported: '/psm_b1ec903a'

I think this is a separate issue, so I'd like to define 
HAVE_BROKEN_POSIX_SEMAPHORES for now.

This has been done in pkgsrc since at least python 2.7 (in 2011), I haven't dug 
deeper.

--
components: Interpreter Core
messages: 408291
nosy: wiz
priority: normal
severity: normal
status: open
title: NetBSD: do not use POSIX semaphores
type: behavior
versions: Python 3.11

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[issue46045] NetBSD: do not use POSIX semaphores

[Thomas Klausner]

Change by Thomas Klausner :


--
keywords: +patch
pull_requests: +28272
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30047

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[issue46046] I/O bound threads got to no chance to run with small CPU bound threads with new GIL

[Souvik Ghosh]

New submission from Souvik Ghosh :

According to David Beazley' talk in PyCon'2010 in Atlanta Georgia, he 
demonstrated about a new GIL with running CPU bound and I/O bound threads 
together.

He said the talk that the threads which are forced to timeout of 5ms, will have 
the lower priority(which is CPU bound) and the thread which suspends the GIL 
within 5ms will have higher priority (which is I/O bound). 

What happens in the following code is if I set args=(1000,) (seven zero 
after 1) then only I/O bound runs and returns when CPU bound takes much time to 
execute. But if I decrease that args to args=(1000,) then I/O bound got no 
chance to reaquire the GIL in the meantime even though the 
sys.getswitchinterval() is equal to 5ms(By default). If I/O bound doesn't 
reacquire GIL with args=(1,) then the time to execute to run 
only the CPU bound takes 0.426035414 seconds. Thats means almost ticks 
0.426035414/0.005=85 (approx) times to set the priority in between the 
two threads. In that case if the I/O got more priority within that time, it 
should have returned the value within that ticks. But I didn't happen. 

import threading
from queue import Queue
from timeit import default_timer as timer
import urllib.request


q = Queue()  # Queue technique to pass returns among threads while running


def decrement(numbers):  # CPU bound
while numbers > 0:
numbers -= 1
if not q.empty():
"""I added this method because this thread will run most of the time
because it's mostly cpu bound"""
print(numbers)
print(q.get(block=False))
print(timer() - start)  # It tell after when exactly I/O bound 
returns value after both the threads started to run


def get_data():  # I/O bound

with urllib.request.urlopen("https://www.google.com";) as dt:
q.put(dt.read(), block=False)


if __name__ == "__main__":
start = timer()
t1 = threading.Thread(target=get_data)
#t2 = threading.Thread(target=decrement, args=(1000,)) #For this I/O 
responds and returns
t2 = threading.Thread(target=decrement, args=(10,)) # I/O doesn't 
responds at all
t1.start()
t2.start()

t1.join()
t2.join()
print(timer() - start)

Look at the second code...


import threading
from queue import Queue
from timeit import default_timer as timer
import urllib.request
import sys


q = Queue()  # Queue technique to pass returns among threads while running


def decrement(numbers):  # CPU bound
while numbers > 0:
numbers -= 1
if not q.empty():
"""I added this method because this thread will run most of the time
because it's mostly cpu bound"""
print(numbers)
print(q.get(block=False))
print(timer() - start)  # It tell after when exactly I/O bound 
returns value after both the threads started to run


def get_data():  # I/O bound

with urllib.request.urlopen("https://www.google.com";) as dt:
q.put(dt.read(), block=False)


if __name__ == "__main__":
sys.setswitchinterval(0.0001)
start = timer()
t1 = threading.Thread(target=get_data)
#t2 = threading.Thread(target=decrement, args=(100,)) #I/O responds 
with this 
t2 = threading.Thread(target=decrement, args=(1,))# I/O doesn't 
responds at all even with this 0.0001 seconds of 
threads switching interval
t1.start()
t2.start()

t1.join()
t2.join()
print(timer() - start)

Can't we have a more better version of GIL to set I/O threads(overall) 
priorities even more better and not to degrade the CPU bound and better 
callbacks in response? Or, try to remove the GIL?

Thank you so much, great future of Python!

--
components: Interpreter Core
files: GIL9.py
messages: 408292
nosy: souvikghosh
priority: normal
severity: normal
status: open
title: I/O bound threads got to no chance to run with small CPU bound threads 
with new GIL
type: performance
versions: Python 3.10
Added file: https://bugs.python.org/file50487/GIL9.py

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[issue45929] extend json.tool --json-lines to ignore empty rows

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

The current implementation allows for the final character of the input to be a 
newline. It does not allow double newlines. In the original example 

   echo -e '{"foo":1}\n{"bar":2}\n'

the echo command adds a newline to the output (which already contains the 
trailing newline), so the result ends with two newlines. Use option -n to 
disable adding newline in echo.

I afraid that if we add support of empty lines, soon we will get requests for 
supporting comments, encoding cookies, single-quote strings, non-quoted keys, 
hexadecimal integers and other possible JSON extensions.

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[issue21964] inconsistency in list-generator comprehension with yield(-from)

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Resolved in issue10544.

--
nosy: +serhiy.storchaka
resolution: out of date -> duplicate
stage: test needed -> resolved
status: pending -> closed
superseder:  -> yield expression inside generator expression does nothing

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[issue46047] When using Py_NewInterpreter, some modules fail to import in Python 3.10

[Jonas Witschel]

New submission from Jonas Witschel :

Consider the following minimal example C code which is trying to import 
jsonschema (https://python-jsonschema.readthedocs.io/en/stable/), compiled 
using "gcc test_newinterpreter.c -I /usr/include/python3.10 -lpython3.10 -o 
test_newinterpreter" or similar:

#include 

int main(void) {
Py_Initialize();
PyThreadState *interpreter = Py_NewInterpreter();
PyRun_SimpleString("import jsonschema");
Py_Finalize();  
}

In Python 3.9.9, this works as expected. However in Python 3.10.0, the 
following error is produced:

Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib/python3.10/site-packages/jsonschema/__init__.py", line 21, in 

from jsonschema._types import TypeChecker
  File "/usr/lib/python3.10/site-packages/jsonschema/_types.py", line 168, in 

draft3_type_checker = TypeChecker(
TypeError: TypeChecker() takes no arguments

Removing the Py_NewInterpreter() call makes the example work as expected in 
Python 3.10.0.

This might be related to the enhancements to the type cache from bpo-42745.

Another recent bug report I found that might possibly be related is bpo-46036.

This bug breaks some WeeChat plugins that try to import one of the affected 
modules, e.g. weechat-matrix (https://github.com/poljar/weechat-matrix).

--
components: C API, Subinterpreters
messages: 408295
nosy: diabonas
priority: normal
severity: normal
status: open
title: When using Py_NewInterpreter, some modules fail to import in Python 3.10
type: compile error
versions: Python 3.10

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[issue46043] Python Launcher Not Opening Files.

[Ronald Oussoren]

Ronald Oussoren  added the comment:

Are you on macOS 10.15 or later?  If so, this is a duplicate of issue40477.

A workaround mentioned in that issue is to make sure that Terminal.app is open.

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type: crash -> behavior

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[issue46047] When using Py_NewInterpreter, some modules fail to import in Python 3.10

[Jonas Witschel]

Jonas Witschel  added the comment:

Downstream bug report in Arch Linux: https://bugs.archlinux.org/task/72979

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[issue46042] Error range of "duplicate argument" SyntaxErrors is too big

[Carl Friedrich Bolz-Tereick]

Carl Friedrich Bolz-Tereick  added the comment:

let's see whether I promised too much, I don't know CPython's symtable.c too 
well yet ;-). Will shout for help when I get stuck.

Anyway, here is a related bug, coming from the same symtable function 
symtable_add_def_helper, also with an imprecise error location:

$ cat x.py 
{i for i in range(5)
if (j := 0)
for j in range(5)}

$ ./python x.py 
  File "/home/cfbolz/projects/cpython/x.py", line 1
{i for i in range(5)

SyntaxError: comprehension inner loop cannot rebind assignment expression 
target 'j'

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[issue46047] When using Py_NewInterpreter, some modules fail to import in Python 3.10

[Jonas Witschel]

Jonas Witschel  added the comment:

I notice this has already been reported as bpo-46006 and bpo-46034, so closing 
in favour of these.

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed

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[issue46006] [subinterpreter] _PyUnicode_EqualToASCIIId() issue with subinterpreters

[Jonas Witschel]

Change by Jonas Witschel :


--
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[issue46048] embeddable distro cannot import modules

[Steve Dower]

New submission from Steve Dower :

The embeddable distro cannot import native modules.

This is because the '.' entry in the ._pth file is incorrect parsed by the new 
getpath module (issue45582).

--
assignee: steve.dower
components: Interpreter Core
messages: 408300
nosy: lukasz.langa, steve.dower
priority: normal
severity: normal
stage: needs patch
status: open
title: embeddable distro cannot import modules
type: behavior
versions: Python 3.11

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[issue46048] embeddable distro cannot import modules

[Steve Dower]

Change by Steve Dower :


--
keywords: +patch
pull_requests: +28273
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/30048

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[issue45995] string formatting: normalize negative zero

[John Belmonte]

Change by John Belmonte :


--
keywords: +patch
nosy: +jbelmonte
nosy_count: 5.0 -> 6.0
pull_requests: +28274
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30049

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[issue25834] getpass falls back when sys.stdin is changed

[Adam Bartoš]

Adam Bartoš  added the comment:

Sorry, I don't. But my use case is not relevant any more since my package was a 
workround for problems with entering Unicode interactively on Windows, and 
these problems were resolved in Python since then.

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[issue46046] I/O bound threads got to no chance to run with small CPU bound threads with new GIL

[Souvik Ghosh]

Souvik Ghosh  added the comment:

Python-ideas link in here:-
https://mail.python.org/archives/list/python-id...@python.org/message/A5MX6SQUHP65JC6V5ZFCCHMMJURM4KHB/

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[issue46048] embeddable distro cannot import modules

[Steve Dower]

Steve Dower  added the comment:


New changeset 971ece8e1738b1107dda692cc44c6d8ddce384cd by Steve Dower in branch 
'main':
bpo-46048: Fix parsing of single character lines in getpath readlines() 
(GH-30048)
https://github.com/python/cpython/commit/971ece8e1738b1107dda692cc44c6d8ddce384cd


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[issue46048] embeddable distro cannot import modules

[Steve Dower]

Change by Steve Dower :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue46032] functools' singledispatch does not support GenericAlias

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
keywords: +patch
pull_requests: +28275
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30050

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[issue46049] ._pth files untested on Linux

[Steve Dower]

New submission from Steve Dower :

Currently ._pth files are "enabled" for all platforms, but are only tested on 
Windows.

Extend the tests in test_site to work on all platforms.

--
assignee: steve.dower
components: Interpreter Core
messages: 408304
nosy: steve.dower
priority: normal
severity: normal
stage: patch review
status: open
title: ._pth files untested on Linux
type: enhancement
versions: Python 3.11

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[issue34624] -W option and PYTHONWARNINGS env variable does not accept module regexes

[Christian Heimes]

Christian Heimes  added the comment:

Adding regular expression support to -W and PYTHONWARNINGS env var turns the 
options into potential attack vectors. It can introduce REDOS vulnerability.

--
keywords: +security_issue
nosy: +christian.heimes
type:  -> enhancement
versions: +Python 3.11 -Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 
3.9

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[issue46049] ._pth files untested on Linux

[Steve Dower]

Change by Steve Dower :


--
keywords: +patch
pull_requests: +28276
pull_request: https://github.com/python/cpython/pull/30051

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[issue46032] functools' singledispatch does not support GenericAlias

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Yes, it is related to issue45665. It is a complicated case due to coincidence 
of several circumstances.

1. isinstance(list[int], type) is True, while isinstance(typing.List[int], 
type) is False. list[int] is considered a type in this check.

2. list[int].__mro__ == list.__mro__, while typing.List[int] does not have the 
__mro__ attribute.  list[int] is considered a type in this check.

3. issubclass(cls, list[int]) raises a TypeError (the same for 
typing.List[int]). list[int] cannot be used as a type here.

4. 2-argument registry() does not check the type of its first argument. 
f.registry(42, ...) is silently passed.

In 2-argument registry() typing.List[int] is passed due to (4) and ignored in 
dispatch() due to (2). list[int] is passed due to (4), but caused error due to 
(3).

In other uses of registry() (1-argument decorator factory and decorator with 
annotations) typing.List[int] is not passed due to 1. list[int] is passed due 
to (1) and caused error due to (3).

The proposed PR makes list[int] be treated the same way as typing.List[int]. It 
also makes 2-argument registry() rejecting invalid first argument, so all three 
forms of registry() accept and reject now the same types.

--
versions: +Python 3.10, Python 3.9

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[issue45665] Problems caused by isinstance(list[int], type) returning True

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
dependencies: +functools' singledispatch does not support GenericAlias

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[issue34798] pprint ignores the compact parameter for dicts

[Matt Bogosian]

Matt Bogosian  added the comment:

Please consider highlighting that dicts are not included in the documentation. 
While *technically* true, this ...

> compact impacts the way that long sequences (lists, tuples, sets, etc) are 
> formatted. If compact is false (the default) then each item of a sequence 
> will be formatted on a separate line. If compact is true, as many items as 
> will fit within the width will be formatted on each output line.

... has several problems.

First, sequence is a term of art that also has a common meaning. This creates a 
potential ambiguity in the understanding of the reader. Resolving that 
ambiguity in this context requires that readers have already internalized that 
dicts are not Python sequences. Those new to Python may not understand the (to 
them, subtle) differences between Python's iterables and sequences. Second, the 
"etc" only expands that ambiguity and invites confusion. Third, the term 
"items" is strongly associated with dicts and is used several times throughout 
the paragraph.

This ...

> According to https://docs.python.org/3/library/pprint.html compact impacts 
> the way that sequences are displayed, and a dict is not a sequence.

... is unhelpfully pedantic, and ignorant of the needs of the newcomer (a key 
demographic of documentation). Documentation is a core product surface with a 
diverse audience. Rather than focus on technical correctness, documentation 
authors should focus on accessibility. Redundancy is a feature, not a bug. You 
can't predict how your reader got to that slice of the documentation. Imagine 
this as an opportunity to educate or reinforce concepts for readers, not as an 
opportunity to argue from a position of technical superiority.

The fact that there are now four developers who have taken their time to file 
patches, bugs, and comments is pretty strong signal that confusion exists among 
the audience and that the documentation is insufficient.

--
nosy: +posita

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[issue25834] getpass falls back when sys.stdin is changed

[Irit Katriel]

Irit Katriel  added the comment:

Thanks, I'll close this and we can revisit if a new use case turns up.

--
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stage:  -> resolved
status: open -> closed

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[issue45997] asyncio.Semaphore waiters deque doesn't work

[Roundup Robot]

Change by Roundup Robot :


--
keywords: +patch
nosy: +python-dev
nosy_count: 3.0 -> 4.0
pull_requests: +28277
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30052

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[issue46049] ._pth files untested on Linux

[Steve Dower]

Steve Dower  added the comment:


New changeset bfc59ed0a00106f5ba4a32a0c5b3dbe71d12665d by Steve Dower in branch 
'main':
bpo-46049: Fixes ._pth support on non-Windows (GH-30051)
https://github.com/python/cpython/commit/bfc59ed0a00106f5ba4a32a0c5b3dbe71d12665d


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[issue18861] Problems with recursive automatic exception chaining

[Irit Katriel]

Irit Katriel  added the comment:

I think this problem is actually simpler than what we've been discussing. 

First, note that by-and-large our current system works:

>>> try:
...   raise VE(1)
... except VE as e1:
...   try:
... raise VE(2)
...   except VE as e2:
... raise VE(3) from e2
... 
Traceback (most recent call last):
  File "", line 2, in 
ValueError: 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "", line 5, in 
ValueError: 2

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "", line 7, in 
ValueError: 3



Here VE(2) is the cause of VE(3) and VE(1) is the context of VE(2), so VE(1) is 
not hidden by the fact that VE(3) has a cause.

The reason that Nick's example didn't work is because he is doing

raise VE(3) from VE(2)

i.e., creating a new exception VE(2) that doesn't have VE(1) as a context. I'm 
not sure there is a use case for this, so I don't think we need to worry about 
it.


The case of None does need fixing. We use None to indicate that there was no 
cause (while suppressing context). But None can't have a context, so VE(1) gets 
lost. We could, instead of None, use a NoException(Exception) class. This 
exception would be chained with the current exc_info() as context so that it 
works like VE(1) as above, and the traceback printing logic will know that it 
needs to be omitted from the output.


This proposal involves no changes to the exception propagation mechanism of the 
interpreter. It would require these changes:

1. Define the new exception type
2. in do_raise, in the case of raise-from the None case changes
3. traceback display code needs to be updated to omit NoExceptions

--
versions: +Python 3.11 -Python 3.5

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[issue46049] ._pth files untested on Linux

[Steve Dower]

Change by Steve Dower :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue46028] 3.11.0a3: under tox, sys._base_executable is wrong

[Ned Batchelder]

Ned Batchelder  added the comment:

Tox isn't needed, just venv from the stdlib:


$ python3.11.0a2 -m venv venv_a2

$ venv_a2/bin/python -c "import sys,os.path; print(e := sys._base_executable); 
print(os.path.exists(e))"
/private/tmp/venv_a2/bin/python
True

$ python3.11.0a3 -m venv venv_a3

$ venv_a3/bin/python -c "import sys,os.path; print(e := sys._base_executable); 
print(os.path.exists(e))"
/usr/local/bin/python
False

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[issue46028] 3.11.0a3: under tox, sys._base_executable is wrong

[Steve Dower]

Steve Dower  added the comment:

What's the contents of the pyvenv.cfg in these cases?

It looks like the first case is definitely wrong, because the base 
executable should not be in "venv_a2" (that's sys.executable), but I 
don't know where it should be on your system.

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[issue23469] Delete Misc/*.wpr files

[Irit Katriel]

Change by Irit Katriel :


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[issue45997] asyncio.Semaphore waiters deque doesn't work

[Yevhenii Hyzyla]

Change by Yevhenii Hyzyla :


--
versions: +Python 3.11 -Python 3.8

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[issue46028] 3.11.0a3: under tox, sys._base_executable is wrong

[Ned Batchelder]

Ned Batchelder  added the comment:

The two venvs seem analogous:


$ cat venv_a2/pyvenv.cfg
home = /usr/local/bin
include-system-site-packages = false
version = 3.11.0

$ ls -al venv_a2/bin
total 72
drwxr-xr-x  13 nedbatchelder  wheel   416 Dec 11 10:43 ./
drwxr-xr-x   6 nedbatchelder  wheel   192 Dec 11 10:43 ../
-rw-r--r--   1 nedbatchelder  wheel  9033 Dec 11 10:43 Activate.ps1
-rw-r--r--   1 nedbatchelder  wheel  1993 Dec 11 10:43 activate
-rw-r--r--   1 nedbatchelder  wheel   919 Dec 11 10:43 activate.csh
-rw-r--r--   1 nedbatchelder  wheel  2061 Dec 11 10:43 activate.fish
-rwxr-xr-x   1 nedbatchelder  wheel   244 Dec 11 10:43 pip*
-rwxr-xr-x   1 nedbatchelder  wheel   244 Dec 11 10:43 pip3*
-rwxr-xr-x   1 nedbatchelder  wheel   244 Dec 11 10:43 pip3.11*
lrwxr-xr-x   1 nedbatchelder  wheel14 Dec 11 10:43 python@ -> python3.11.0a2
lrwxr-xr-x   1 nedbatchelder  wheel14 Dec 11 10:43 python3@ -> 
python3.11.0a2
lrwxr-xr-x   1 nedbatchelder  wheel14 Dec 11 10:43 python3.11@ -> 
python3.11.0a2
lrwxr-xr-x   1 nedbatchelder  wheel29 Dec 11 10:43 python3.11.0a2@ -> 
/usr/local/bin/python3.11.0a2

$ cat venv_a3/pyvenv.cfg
home = /usr/local/bin
include-system-site-packages = false
version = 3.11.0

$ ls -al venv_a3/bin
total 72
drwxr-xr-x  13 nedbatchelder  wheel   416 Dec 11 10:43 ./
drwxr-xr-x   6 nedbatchelder  wheel   192 Dec 11 10:43 ../
-rw-r--r--   1 nedbatchelder  wheel  9033 Dec 11 10:43 Activate.ps1
-rw-r--r--   1 nedbatchelder  wheel  1993 Dec 11 10:43 activate
-rw-r--r--   1 nedbatchelder  wheel   919 Dec 11 10:43 activate.csh
-rw-r--r--   1 nedbatchelder  wheel  2061 Dec 11 10:43 activate.fish
-rwxr-xr-x   1 nedbatchelder  wheel   244 Dec 11 10:43 pip*
-rwxr-xr-x   1 nedbatchelder  wheel   244 Dec 11 10:43 pip3*
-rwxr-xr-x   1 nedbatchelder  wheel   244 Dec 11 10:43 pip3.11*
lrwxr-xr-x   1 nedbatchelder  wheel14 Dec 11 10:43 python@ -> python3.11.0a3
lrwxr-xr-x   1 nedbatchelder  wheel14 Dec 11 10:43 python3@ -> 
python3.11.0a3
lrwxr-xr-x   1 nedbatchelder  wheel14 Dec 11 10:43 python3.11@ -> 
python3.11.0a3
lrwxr-xr-x   1 nedbatchelder  wheel29 Dec 11 10:43 python3.11.0a3@ -> 
/usr/local/bin/python3.11.0a3

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[issue45578] Missing tests for the dis module

[Nikita Sobolev]

Change by Nikita Sobolev :


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pull_request: https://github.com/python/cpython/pull/30058

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[issue46050] [pathlib] Option so that OSError does not block glob in pathlib library

[matt]

New submission from matt :

Hi there,
ISSUE DESCRIPTION
when I browse starting from the linux root ('/')
path = pathlib.Path('/')
_glob = '**/*'
for p in path.glob(_glob):

The program stops on my machine because of OSError.
  File "/usr/lib/python3.8/pathlib.py", line 535, in _select_from
entries = list(scandir_it)

OSError: [Errno 22] Invalid argument: '/proc/5916/task/5916/net'


Entering post mortem debugging...

> /usr/lib/python3.8/pathlib.py(535)_select_from()
533 try:
534 with scandir(parent_path) as scandir_it:
--> 535 entries = list(scandir_it)
536 for entry in entries:
537 if self.dironly:

I also another case is if a cloud drive is disconnected.

QUICK SOLUTION
I solved both issues for me by adding an adding an except OSError: return at 
the end of the two function below:

class _WildcardSelector(_Selector):
def _select_from(self, parent_path, is_dir, exists, scandir):
(...)
except OSError:
return

class _RecursiveWildcardSelector(_Selector):
def _iterate_directories(self, parent_path, is_dir, scandir):
(...)
except OSError:
return

FEATURE REQUEST
I don't know the consequences of those 2 modifications so perhaps they could 
follow an option when calling glob with an optional parameter ignoreOSerror = 
false by default?!

--
components: Library (Lib)
messages: 408314
nosy: matt32106
priority: normal
severity: normal
status: open
title: [pathlib] Option so that OSError does not block glob in pathlib library
type: enhancement
versions: Python 3.8

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[issue46040] asyncio.coroutine documented as removed in 3.10

[Irit Katriel]

Change by Irit Katriel :


--
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nosy: +asvetlov, yselivanov

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[issue45949] Provide pure-Python implementation of Programs/_freeze_module for cross building

[Christian Heimes]

Christian Heimes  added the comment:

In his code review Eric made a point that the relationship of variables and 
their impact on normal and cross builds are not obvious. I'm going to introduce 
new variables for freezing and freezing dependencies. Bonus: Cross builds no 
longer build non-functional _bootstrap_python and Programs/_freeze_module.

Normal build:

PYTHON_FOR_FREEZE=./_bootstrap_python
FREEZE_MODULE_BOOTSTRAP=./Programs/_freeze_module
FREEZE_MODULE_BOOTSTRAP_DEPS=Programs/_freeze_module
FREEZE_MODULE=$(PYTHON_FOR_FREEZE) $(srcdir)/Programs/_freeze_module.py
FREEZE_MODULE_DEPS=_bootstrap_python $(srcdir)/Programs/_freeze_module.py


Cross build:

PYTHON_FOR_FREEZE=/path/to/build/python
FREEZE_MODULE_BOOTSTRAP=$(PYTHON_FOR_FREEZE) 
$(srcdir)/Programs/_freeze_module.py
FREEZE_MODULE_BOOTSTRAP_DEPS=$(srcdir)/Programs/_freeze_module.py
FREEZE_MODULE=$(FREEZE_MODULE_BOOTSTRAP)
FREEZE_MODULE_DEPS=$(FREEZE_MODULE_BOOTSTRAP_DEPS)

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[issue40059] Provide a toml module in the standard library

[Martin Reboredo]

Martin Reboredo  added the comment:

A new python-ideas mail thread was created for this, you can check it out at 
https://mail.python.org/archives/list/python-id...@python.org/thread/IWJ3I32A4TY6CIVQ6ONPEBPWP4TOV2V7/.

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[issue34798] pprint ignores the compact parameter for dicts

[Irit Katriel]

Irit Katriel  added the comment:

Don't discuss on a closed issue. Create a new one if there is still a problem.

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[issue46040] asyncio.coroutine documented as removed in 3.10

[Ken Jin]

Change by Ken Jin :


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[issue46028] 3.11.0a3: under tox, sys._base_executable is wrong

[Saaket Prakash]

Saaket Prakash  added the comment:

I tried the same stuff as nedbat on WSL2, and I see similar change in the path 
of sys._base_executable (though I get a different "base" path on a3, so the 
path exists even there).

$ ~/.pyenv/versions/3.11.0a2/bin/python -m venv venv_a2
$ ~/.pyenv/versions/3.11.0a3/bin/python -m venv venv_a3
$ venv_a2/bin/python -c "import sys,os.path; print(e := sys._base_executable); 
print(os.path.exists(e))"
/home/ss/venv_a2/bin/python
True

$ venv_a3/bin/python -c "import sys,os.path; print(e := sys._base_executable); 
print(os.path.exists(e))"
/home/ss/.pyenv/versions/3.11.0a3/bin/python
True

$ cat venv_a2/pyvenv.cfg
home = /home/ss/.pyenv/versions/3.11.0a2/bin
include-system-site-packages = false
version = 3.11.0

$ cat venv_a3/pyvenv.cfg
home = /home/ss/.pyenv/versions/3.11.0a3/bin
include-system-site-packages = false
version = 3.11.0

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[issue46028] 3.11.0a3: under tox, sys._base_executable is wrong

[Saaket Prakash]

Saaket Prakash  added the comment:

But on windows with the python.org installer, the behavior is same for both 
both a2 and a3.

# With a3 installed

> py -m venv venv_a3
> venv_a3/Scripts/python -c "import sys,os.path; print(e := 
> sys._base_executable); print(os.path.exists(e))"
C:\Users\ss\AppData\Local\Programs\Python\Python311\python.exe
True
> cat venv_a3/pyvenv.cfg
home = C:\Users\ss\AppData\Local\Programs\Python\Python311
include-system-site-packages = false
version = 3.11.0

# With a2 installed

> py -m venv venv_a2
> venv_a2/Scripts/python -c "import sys,os.path; print(e := 
> sys._base_executable); print(os.path.exists(e))"
C:\Users\ss\AppData\Local\Programs\Python\Python311\python.exe
True
> cat venv_a2/pyvenv.cfg
home = C:\Users\ss\AppData\Local\Programs\Python\Python311
include-system-site-packages = false
version = 3.11.0

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[issue40059] Provide a toml module in the standard library

[Christian Heimes]

Christian Heimes  added the comment:

I just noticed that tomli has dropped support for Python 3.6. That's a road 
block for general adoption of the package in the Python ecosystem. Python 3.6 
is the default Python interpreter in CentOS 8, C8S, RHEL 8, and Ubuntu 18.04 
LTS. https://github.com/hukkin/tomli/pull/134

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[issue46051] Make @atexit.register work for functions with arguments

[quapka]

New submission from quapka :

Hi folks!

Let me first present an example that motivated this issue. Imagine a script 
that builds Docker images and later starts them as Docker containers. To avoid 
having to stop the containers "manually" (in code and potentially forgot) I had 
an idea to register each container when started and stop each using atexit 
module. I chose to encapsulate this behavior inside a class. A much simplified 
example looks like this:

import atexit

class Program:
# keep a class level list of started containers
running_containers = []

@atexit.register
@classmethod
def clean_up(cls, *args, **kwargs):
for container in cls.running_containers:
print(f'stopping {container}')

def start_container(self, container):
print(f'starting {container}')
self.__class__.running_containers.append(container)

prog = Program()
a.start_container('container_A')
a.start_container('container_B')

And I'd expect this to produce:

starting container_A
starting container_B
stopping container_A
stopping container_B

To me, this reads rather nicely: the Program.clean_up method can be called by 
the user, but if he forgets it will be handled for him using atexit. However, 
this code does not work. :) I've spent some time debugging and what follows are 
my observations:

1) If the order of decorators is @atexit.register and then @classmethod then 
the code throws 'TypeError: the first argument must be callable'. I believe it 
is because classmethod and staticmethod are descriptors without the __call__ 
method implemented. atexit.register does not check this and instead of 
func.__func__ (which resolves to Program.clean_up) gets func (a classmethod) 
which is not callable 
(https://github.com/python/cpython/blob/main/Modules/atexitmodule.c#L147).

2) If the order of decorators is swapped (@classmethod and @atexit.register) 
then the code throws "Error in atexit._run_exitfuncs:\nTypeError: clean_up() 
missing 1 required positional argument: 'cls'". From my limited understanding 
of CPython and atexitmodule.c I think what happens is that the @atexit.register 
returns 
(https://github.com/python/cpython/blob/main/Modules/atexitmodule.c#L180) the 
func without the args and kwargs (since this issue 
https://bugs.python.org/issue1597824).

3) However, if I step away from decorating using @atexit.register and instead 
use

[...]
atexit.register(Program.clean_up) # <-- register post definition
prog = Program()
a.start_container('container_A')
a.start_container('container_B')

then the code works as expected and outputs:

starting container_A
starting container_B
stopping container_A
stopping container_B


To summarize, I don't like 3) as it puts the responsibility in a bit awkward 
place (good enough if I'm the only user, but I wonder about the more general 
library-like cases). My decorating skills are a bit dull now and it's my first 
time seriously looking into CPython internals - I've tried to encapsulate 
atexit.register in my custom decorator, to check whether that could be a 
workaround but overall was unsuccessful. In short, I'd say that in both 1) and 
2) the cls arg is lost when atexit calls the function. I've tried to dig it up 
from the func passed to atexit.register

def my_atexit_decorator(func, *args, **kwargs):
cls = # some magic with under attrs and methods
register.atexit(func, cls=cls, *args, **kwargs)
[...]

, but failed (it also felt like a fragile approach).

I was not able to understand why @atexit.register does not work when the 
function's signature is not empty. Also, if fixable I'm happy to actually put 
the effort into fixing it myself (looks like a nice first CPython PR), but I'd 
like to have someone else's opinion before I start marching in the wrong 
direction. Also, let me know if you'd like more details or code/tests I've 
produced while debugging this.

Cheers!

--
messages: 408321
nosy: quapka
priority: normal
severity: normal
status: open
title: Make @atexit.register work for functions with arguments
type: enhancement

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[issue46042] Error range of "duplicate argument" SyntaxErrors is too big

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


--
keywords: +patch
pull_requests: +28279
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30059

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[issue28816] [doc] Clarify that zipimport does not invoke import hooks to load custom files from zip.

[Irit Katriel]

Change by Irit Katriel :


--
pull_requests: +28280
status: pending -> open
pull_request: https://github.com/python/cpython/pull/30060

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[issue46042] Error range of "duplicate argument" SyntaxErrors is too big

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Don't worry, turns out it was a bit messier than I thought, so I prepared the 
PR. If you have some time, it would be great if you can take a quick look.

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[issue12833] Document the need to pass the prompt to raw_input() with readline

[Irit Katriel]

Change by Irit Katriel :


--
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status: pending -> closed

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[issue46042] Error range of "duplicate argument" SyntaxErrors is too big

[Carl Friedrich Bolz-Tereick]

Carl Friedrich Bolz-Tereick  added the comment:

Oh no, I was about to open mine ;-)

https://github.com/python/cpython/compare/main...cfbolz:bpo-46042-syntax-error-range-duplicate-argument?expand=1

Basically equivalent, but I fixed the second bug too (would be very easy to add 
to yours)

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[issue46042] Error range of "duplicate argument" SyntaxErrors is too big

[Carl Friedrich Bolz-Tereick]

Carl Friedrich Bolz-Tereick  added the comment:

ah, confused, seems you fixed them both too. will take a closer look!

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[issue24012] Add error checks to PyInit_pyexpat()

[Irit Katriel]

Irit Katriel  added the comment:

This is all sorted now:

iritkatriel@Irits-MBP cpython % grep "PyModule_AddObject(" Modules/pyexpat.c 
if (PyModule_AddObject(mod, name, submodule) < 0) {
if (PyModule_AddObject(errors_module, "codes", codes_dict) < 0) {
if (PyModule_AddObject(errors_module, "messages", rev_codes_dict) < 0) {
if (PyModule_AddObject(mod, "features", list) < 0) {
if (PyModule_AddObject(mod, "version_info", versionInfo) < 0) {
if (PyModule_AddObject(mod, "expat_CAPI", capi_object) < 0) {
iritkatriel@Irits-MBP cpython % grep "PyDict_SetItem(" Modules/pyexpat.c
PyDict_SetItem(self->intern, result, result) == 0)
else if (PyDict_SetItem(container, n, v)) {
int res = PyDict_SetItem(rev_codes_dict, num, str);
iritkatriel@Irits-MBP cpython % grep "PySys_GetObject(" Modules/pyexpat.c
iritkatriel@Irits-MBP cpython %

--
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resolution:  -> out of date
stage: patch review -> resolved
status: open -> closed

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[issue24010] Add error checks to PyInit__locale()

[Irit Katriel]

Irit Katriel  added the comment:

This function now looks like this:

PyMODINIT_FUNC
PyInit__locale(void)
{
return PyModuleDef_Init(&_localemodule);
}

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stage: patch review -> resolved
status: open -> closed

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[issue46040] asyncio.coroutine documented as removed in 3.10

[Andrew Svetlov]

Change by Andrew Svetlov :


--
keywords: +patch
pull_requests: +28281
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30061

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[issue35999] multpirocessing.Process alive after SIGTERM on parent

[Irit Katriel]

Irit Katriel  added the comment:

This example is not working for me on 3.11:

>>> from multiprocessing import Process
>>> from time import sleep
>>> from os import getpid
>>> 
>>> def log(daemon_mode):
... while True:
... print('worker %i %s' % (getpid(), daemon_mode))
... sleep(3)
... 
>>> 
>>> print('parent pid %i' % getpid())
parent pid 77378
>>> 
>>> a = Process(target=log, args=(0,), daemon=False)
>>> a.start()
>>> :744: DeprecationWarning: 
>>> BuiltinImporter.module_repr() is deprecated and slated for removal in 
>>> Python 3.12
Traceback (most recent call last):
  File "", line 1, in 
  File "/Users/iritkatriel/src/cpython-654/Lib/multiprocessing/spawn.py", line 
116, in spawn_main
exitcode = _main(fd, parent_sentinel)
   ^^
  File "/Users/iritkatriel/src/cpython-654/Lib/multiprocessing/spawn.py", line 
126, in _main
self = reduction.pickle.load(from_parent)
   ^^
AttributeError: Can't get attribute 'log' on 

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[issue14484] missing return in win32_kill?

[Irit Katriel]

Irit Katriel  added the comment:

That piece of code is still there, the function is now called os_kill_impl.

--
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versions: +Python 3.10, Python 3.11, Python 3.9 -Python 2.7, Python 3.4, Python 
3.5

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[issue46040] asyncio.coroutine documented as removed in 3.10

[Andrew Svetlov]

Andrew Svetlov  added the comment:


New changeset 991736697dff693b6c9f8964bb7540081bbf4ddb by Andrew Svetlov in 
branch '3.10':
[3.10] bpo-46040: Fix removal text for @asyncio.coroutine (GH-30061)
https://github.com/python/cpython/commit/991736697dff693b6c9f8964bb7540081bbf4ddb


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[issue46040] asyncio.coroutine documented as removed in 3.10

[Andrew Svetlov]

Change by Andrew Svetlov :


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[issue27227] argparse fails to parse [] when using choices and nargs='*'

[Irit Katriel]

Irit Katriel  added the comment:

Reproduced on 3.11.

--
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3.6, Python 3.7

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[issue27718] help('signal') incomplete (e.g: signal.signal not visible)

[Irit Katriel]

Change by Irit Katriel :


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[issue37700] shutil.copyfile does not raise SpecialFileError for socket files

[Irit Katriel]

Change by Irit Katriel :


--
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3.6, Python 3.7, Python 3.8

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[issue37701] shutil.copyfile raises SpecialFileError for symlink to fifo

[Irit Katriel]

Change by Irit Katriel :


--
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[issue27257] get_addresses results in traceback with an addrspec with an empty local part.

[Irit Katriel]

Irit Katriel  added the comment:

I am unable to reproduce this on 3.11:

>>> with open(b'lkml-exception.mail', mode = 'r') as f:
...  msg = email.message_from_file(f, policy=email.policy.SMTP)
... 
Traceback (most recent call last):
  File "", line 2, in 
AttributeError: module 'email' has no attribute 'policy'
>>> import email.policy
>>> with open(b'lkml-exception.mail', mode = 'r') as f:
...  msg = email.message_from_file(f, policy=email.policy.SMTP)
... 
>>> msg.get_all('to')
['unlisted-recipients:;, @pop.kundenserver.de']
>>>

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status: open -> pending

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[issue26571] turtle regression in 3.5

[Irit Katriel]

Change by Irit Katriel :


--
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 3.5

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[issue9338] argparse optionals with nargs='?', '*' or '+' can't be followed by positionals

[Irit Katriel]

Irit Katriel  added the comment:

Reproduced on 3.11:

>>> import argparse
>>> parser = argparse.ArgumentParser(prog='PROG')
>>> 
>>> parser.add_argument('--badger', nargs='+')
_StoreAction(option_strings=['--badger'], dest='badger', nargs='+', const=None, 
default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.add_argument('spam')
_StoreAction(option_strings=[], dest='spam', nargs=None, const=None, 
default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.parse_args('--badger A B C D'.split())
usage: PROG [-h] [--badger BADGER [BADGER ...]] spam
PROG: error: the following arguments are required: spam

--
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3.3

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[issue34557] When sending binary file to a Microsoft FTP server over FTP TLS, the SSL unwind method hangs

[Irit Katriel]

Change by Irit Katriel :


--
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3.5, Python 3.6, Python 3.7, Python 3.8

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[issue9504] signal.signal/signal.alarm not working as expected

[Irit Katriel]

Change by Irit Katriel :


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[issue29221] ABC Recursion Error on isinstance() with less than recursion limit class hierarchy depth

[Irit Katriel]

Change by Irit Katriel :


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[issue19459] Python does not support the GEORGIAN-PS charset

[Irit Katriel]

Change by Irit Katriel :


--
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[issue35037] PYLONG_BITS_IN_DIGIT differs between MinGW and MSVC

[Irit Katriel]

Change by Irit Katriel :


--
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 2.7, Python 3.5, Python 
3.6, Python 3.7, Python 3.8

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[issue46005] [doc] replace 'distutils' examples with 'setuptools'

[Nikita Sobolev]

Nikita Sobolev  added the comment:

Or maybe we should just include 
https://github.com/python/cpython/blob/main/Doc/distutils/_setuptools_disclaimer.rst
 as others do?

I will send my proposal :)

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[issue46005] [doc] replace 'distutils' examples with 'setuptools'

[Nikita Sobolev]

Change by Nikita Sobolev :


--
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pull_requests: +28282
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30062

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[issue40059] Provide a toml module in the standard library

[Chih-Hsuan Yen]

Change by Chih-Hsuan Yen :


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[issue46043] Python Launcher Not Opening Files.

[Nicholas Bond]

Nicholas Bond  added the comment:

I am on macOS 12 and it still doesn't work when Terminal.app is open.

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[issue23948] Deprecate os.kill() on Windows

[Eryk Sun]

Change by Eryk Sun :


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[issue42962] Windows: SystemError during os.kill(..., signal.CTRL_C_EVENT)

[Eryk Sun]

Change by Eryk Sun :


--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> missing return in win32_kill?

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[issue44674] dataclasses should allow frozendict default value

[Eric V. Smith]

Eric V. Smith  added the comment:


New changeset e029c53e1a408b89a4e3edf30a9b38b094f9c880 by Eric V. Smith in 
branch 'main':
bpo-44674: Use unhashability as a proxy for mutability for default dataclass 
__init__ arguments. (GH-29867)
https://github.com/python/cpython/commit/e029c53e1a408b89a4e3edf30a9b38b094f9c880


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[issue44674] dataclasses should allow frozendict default value

[Eric V. Smith]

Change by Eric V. Smith :


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[issue14484] missing return in win32_kill?

[Eryk Sun]

Eryk Sun  added the comment:

The details of os.kill() on Windows have been discussed extensively for years 
in various issues such as bpo-26350, bp-23948, and bp42962. But the problem of 
the missing return statement is always overwhelmed by discussion of the 
egregiously bad design of this function and its misuse, which depends on bugs 
in WinAPI GenerateConsoleCtrlEvent() when passed a PID that is not a process 
group ID and/or not attached to the console.

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[issue14484] missing return in win32_kill?

[Eryk Sun]

Change by Eryk Sun :


--
Removed message: https://bugs.python.org/msg408336

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[issue14484] missing return in win32_kill?

[Eryk Sun]

Eryk Sun  added the comment:

The details of os.kill() on Windows have been discussed extensively for years 
in various issues such as bpo-26350, bpo-23948, and bpo-42962. But the problem 
of the missing return statement is always overwhelmed by discussion of the 
egregiously bad design of this function and its misuse, which depends on bugs 
in WinAPI GenerateConsoleCtrlEvent() when passed a PID that is not a process 
group ID and/or not attached to the console.

--
versions: +Python 3.7 -Python 3.10, Python 3.11, Python 3.9

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[issue46024] Different behaviour with zipfile

[Eric V. Smith]

Eric V. Smith  added the comment:

Actually, printing out:
print(repr(path), repr(ZipPath(path)))
would be more useful.

If I don't hear back in a few days, I'm going to close this issue.

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[issue27718] help('signal') incomplete (e.g: signal.signal not visible)

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
keywords: +patch
nosy: +serhiy.storchaka
nosy_count: 6.0 -> 7.0
pull_requests: +28283
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30063

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[issue45650] cgitb does not emit CGI headers when format='text'

[Eric V. Smith]

Eric V. Smith  added the comment:

Having not heard back about a use case for this, I'm going to close it. If you 
want to move this forward, I suggest proposing it on the python-ideas mailing 
list.

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[issue44053] Can't connect to a server also not showing any type of output

[Eric V. Smith]

Eric V. Smith  added the comment:

Closing due to lack of feedback.

--
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type:  -> behavior

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[issue24372] Documentation for ssl.wrap_socket's ssl_version parameter is odd

[Eric V. Smith]

Change by Eric V. Smith :


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[issue44475] Dataclass Causes Infinite Recursion when using type of bytes

[Eric V. Smith]

Eric V. Smith  added the comment:

Closing due to lack of feedback.

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[issue27718] help('signal') incomplete (e.g: signal.signal not visible)

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

This is due to use functools.wraps(). If __all__ is not defined all non-builtin 
functions should have correct __module__ to be displayed by pydoc. 
functools.wraps() assigns __module__, __name__, __qualname__, __doc__ and 
__annotations__. __module__ should be preserved ('signal', not '_signal'), 
__name__ and __qualname__ are already correct, __annotations__ does not exist. 
So only __doc__ should be copied.

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[issue46042] Error range of "duplicate argument" SyntaxErrors is too big

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 59435eea08d30796174552c0ca03c59b41adf8a5 by Pablo Galindo Salgado 
in branch 'main':
bpo-46042: Improve SyntaxError locations in the symbol table (GH-30059)
https://github.com/python/cpython/commit/59435eea08d30796174552c0ca03c59b41adf8a5


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[issue46042] Error range of "duplicate argument" SyntaxErrors is too big

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 3.0 -> 4.0
pull_requests: +28284
pull_request: https://github.com/python/cpython/pull/30064

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[issue46042] Error range of "duplicate argument" SyntaxErrors is too big

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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status: open -> closed

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[issue46042] Error range of "duplicate argument" SyntaxErrors is too big

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

> Oh no, I was about to open mine ;-)

Sorry, Carl, I apologize. I hope it was not too disruptive to do the work. I 
was taking a look and I felt bad that the issue was probably messier than I 
thought and I didn't want you to have to iterate many times :(

Thanks a lot for helping review the PR and for pointing out the extra cases!!

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[issue9436] test_sysconfig failure: build a 32-bit Python a 64-bit OS

[Irit Katriel]

Change by Irit Katriel :


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[issue46052] Ctrl+C, Ctrl+V in IDLE on Windows do not work with Cyrillic keyboard layout

[Anton Bryl]

New submission from Anton Bryl :

Ctrl+C and Ctrl+V key combinations in IDLE on Windows do not work with Cyrillic 
keyboard layout. It is unexpected, as well as inconvenient when editing string 
constants.

--
assignee: terry.reedy
components: IDLE
messages: 408345
nosy: anton.bryl, terry.reedy
priority: normal
severity: normal
status: open
title: Ctrl+C, Ctrl+V in IDLE on Windows do not work with Cyrillic keyboard 
layout
type: behavior
versions: Python 3.9

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[issue37701] shutil.copyfile raises SpecialFileError for symlink to fifo

[Eryk Sun]

Eryk Sun  added the comment:

> Raising a SpecialFileError would be OK if `follow_symlinks` was False.

I expect it to fail if follow_symlinks is True, which is the default value. I 
expect it to succeed with follow_symlinks=False, which should create a shallow 
copy of just the symlink, regardless of its target. Instead, what happens is 
that it calls shutil._stat(fn) on both src and dst, regardless of 
follow_symlinks. I think the call should be shutil._stat(fn, follow_symlinks). 
This requires updating shutil._stat() to pass the value to fn.stat() and 
os.stat().

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[issue29221] ABC Recursion Error on isinstance() with less than recursion limit class hierarchy depth

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

It is still reproducible if increase the depth. In 3.8-3.10 it needs 329 nested 
classes, in 3.11 -- 496.

Seems the limit is sys.getrecursionlimit()//k - 4, where k=4 in 3.7 and older, 
k=3 in 3.8-3.10, and k=2 in 3.11. It is much better than was initially, but the 
ideal is k=1.

--
resolution: out of date -> 
stage: resolved -> 
status: closed -> open
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 2.7, Python 3.5, Python 
3.6, Python 3.7

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[issue46032] functools' singledispatch does not support GenericAlias

[Alex Waygood]

Alex Waygood  added the comment:

The PR looks good to me. I think it's also important that we document that 
these types aren't supported, as it's not mentioned anywhere at the moment. 
Related: Issue34498.

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[issue46053] NetBSD: ossaudio support incomplete

[Thomas Klausner]

New submission from Thomas Klausner :

When compiling Python on NetBSD, the ossaudio module is not enabled.
1. the code tries to export some #define that are not in the public OSS API 
(but that some other implementations provide)
2. on NetBSD, you need to link against libossaudio when using OSS

--
components: Extension Modules
messages: 408349
nosy: wiz
priority: normal
severity: normal
status: open
title: NetBSD: ossaudio support incomplete
type: enhancement
versions: Python 3.11

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