Antoon,
On 12/23/23 01:00, Antoon Pardon via Python-list wrote:
I am writing a program that goes through file hierarchies and I am mostly
using scandir for that which produces DirEntry instances.
At times it would be usefull if I could make my own DirEntry for a specific
path, however when I
Apologies: neglected suggested web.refs:
https://datagy.io/python-environment-variables/
https://pypi.org/project/json_environ/
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On 12/6/23 03:37, Chris Green via Python-list wrote:
Is there a neat, pythonic way to store values which are 'sometimes'
changed?
My particular case at the moment is calibration values for ADC inputs
which are set by running a calibration program and used by lots of
programs which display the
Avi,
On 11/27/2023 4:15 PM, avi.e.gr...@gmail.com wrote:
Dave,
Back on a hopefully more serious note, I want to make a bit of an analogy
with what happens when you save data in a format like a .CSV file.
Often you have a choice of including a header line giving names to the
resulting columns,
On 11/27/2023 10:04 AM, Peter J. Holzer via Python-list wrote:
On 2023-11-25 08:32:24 -0600, Michael F. Stemper via Python-list wrote:
On 24/11/2023 21.45, avi.e.gr...@gmail.com wrote:
Of course, for serious work, some might suggest avoiding constructs like a
list of lists and switch to using
On 11/27/2023 1:08 AM, Roel Schroeven via Python-list wrote:
I prefer namedtuples or dataclasses over tuples. They allow you to refer
to their fields by name instead of index: student.gpa is much clearer
than student[2], and makes it less likely to accidentally refer to the
wrong field.
+1
On 11/27/2023 12:48 AM, Chris Angelico via Python-list wrote:
On Sun, 26 Nov 2023 at 21:08, Michael F. Stemper via Python-list
wrote:
On 24/11/2023 21.45, avi.e.gr...@gmail.com wrote:
Grizz[l]y,
I think the point is not about a sorted list or sorting in general It is
about reasons why
On 11/25/2023 3:31 AM, Loris Bennett via Python-list wrote:
Hi,
I want to print some records from a database table where one of the
fields contains a JSON string which is read into a dict. I am doing
something like
print(f"{id} {d['foo']} {d['bar']}")
However, the dict does not always
ntor.
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h
> of the speed of Fortran in C. But it required using an error prone subset
> of C without good error detection.
Pointers were introduced in Fortran 90.
Neil.
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Neil Girdhar added the comment:
@eric
Good thinking. Would it make sense to add to the documentation as well that
the __post_init__ methods aren't collected, and you should call super's
__post_init__ if there is one using something like
if hasattr(super(), "__post_i
New submission from Neil Webber :
The math module documentation says:
Except when explicitly noted otherwise, all return values are floats.
But this code returns an integer:
from math import prod; prod((1,2,3))
Doc should "explicitly note otherwise" here, I imagine. The i
Neil Girdhar added the comment:
@Raymond yeah I've been thinking about this some more, and there's no way to
have a "top level" method with the dataclass decorator.
I think I will make a case to have a class version of dataclasses that works
with inheritance. Class versions of d
Neil Girdhar added the comment:
> How would an arbitrary derived class know how to call this? It can't. There
> has to be knowledge of the base class's requirements already. Surely knowing
> "__post_init__ must be called with some_arg" isn't too different from "
Neil Girdhar added the comment:
> I'm not crazy about adding a method to every dataclass just for the 0.1% of
> the times it's needed.
I'm not sure I totally understand the cost here. You can have a single shared
global function that you set on each dataclass. So the only cost
Neil Girdhar added the comment:
On Sat, Feb 19, 2022 at 2:51 AM Vedran Čačić wrote:
>
> Vedran Čačić added the comment:
>
> That "except AttributeError" approach is a powerful bug magnet, since it
> can very easily mask real attribute errors stemming from mis
New submission from Neil Girdhar :
When defining a dataclass, it's possible to define a post-init (__post_init__)
method to, for example, verify contracts.
Sometimes, when you inherit from another dataclass, that dataclass has its own
post-init method. If you want that method to also do its
Neil Girdhar added the comment:
Thank you, this would have saved me a lot of time!
On Sat, Feb 12, 2022 at 8:37 PM Alexander wrote:
>
> Alexander added the comment:
>
> Indeed, the error message does not help to identify the problem. Moreover,
> it collides with
New submission from Neil Girdhar :
class C:
@property
def f(self) -> int:
return 2
class D(C):
pass
D().f = 2
Gives:
Traceback (most recent call last):
File "/home/neil/src/cmm/a.py", line 10, in
D().f = 2
AttributeError: can't set attribute
Neil Schemenauer added the comment:
My preference would be for --with-mimalloc=yes in an upcoming release. For
platforms without the required stdatomic.h stuff, they can manually specify
--with-mimalloc=no. That will make them aware that a future release of Python
might no longer build
Neil Schemenauer added the comment:
Thanks, I'm indeed interested. Most credit goes to Christian for advancing
this.
For the missing stdatomic.h, would it be appropriate to have an autoconfig
check for it? Can just disable mimalloc if it doesn't exist
Change by Neil Isaac :
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On 13/11/2021 10.51, Abdur-Rahmaan Janhangeer wrote:
> Greetings list,
>
> Let's say i created a package named miaw
>
> miaw also has a cli command called miaw
>
> miaw prints files and folders in the directory it is called in
>
> except that when miaw is used, it prints the files and folders
Neil Schemenauer added the comment:
Closing since I believe the bug is fixed and there is an appropriate unit test.
--
assignee: -> nascheme
resolution: -> fixed
stage: patch review -> resolved
status: open -> closed
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On 27/10/2021 12.29, Stefan Ram wrote:
> dn writes:
>> On 27/10/2021 11.16, Stefan Ram wrote:
>>> The Mental Game of Python - Raymond Hettinger (PyBay 2019)
>>> | "The computer gives us words that do ### things.
> ...
>> Alternately, if your question was to identify the mumbled word, it is
>>
Change by Neil Schemenauer :
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pull_requests: +27415
pull_request: https://github.com/python/cpython/pull/29138
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New submission from Neil Schemenauer :
Some makefile rules don't work if you build in a separate folder.
--
messages: 404671
nosy: nascheme
priority: normal
severity: normal
stage: patch review
status: open
title: Run smelly.py and multissltests.py from $(srcdir)
type: behavior
Change by Neil Schemenauer :
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stage: patch review -> resolved
status: open -> closed
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Neil Schemenauer added the comment:
New changeset 1cdac61065e72db60d26e03ef9286d2743d7000e by Miss Islington (bot)
in branch '3.10':
bpo-45521: Fix a bug in the obmalloc radix tree code. (GH-29051) (GH-29122)
https://github.com/python/cpython/commit/1cdac61065e72db60d26e03ef9286d2743d7000e
Neil Schemenauer added the comment:
New changeset 311910b31a4bd94dc79298388b7cb65ca5546438 by Neil Schemenauer in
branch 'main':
bpo-45521: Fix a bug in the obmalloc radix tree code. (GH-29051)
https://github.com/python/cpython/commit/311910b31a4bd94dc79298388b7cb65ca5546438
Neil Schemenauer added the comment:
I have not yet been able to reproduce methane's crash. My guess it it's not
related.
An explanation of what I think the impact of this bug is:
The radix tree is used to determine if memory is from obmalloc or from the
system malloc (i.e return value
Change by Neil Schemenauer :
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pull_requests: +27329
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New submission from Neil Schemenauer :
Given this feedback:
https://github.com/python/cpython/pull/14474/files#r725488766
it is perhaps not so safe to assume that only the lower 48 bits of virtual
addresses are significant. I had the idea that Go made similar assumptions but
now I'm
Change by Neil Schemenauer :
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pull_requests: +27322
pull_request: https://github.com/python/cpython/pull/29051
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New submission from Neil Schemenauer :
There is a typo in the radix tree obmalloc code, spotted by Inada Naoki.
-#define MAP_TOP_MASK (MAP_BOT_LENGTH - 1)
+#define MAP_TOP_MASK (MAP_TOP_LENGTH - 1)
This should be fixed both in the main branch and in 3.10.x.
--
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On 25/09/2021 11.00, Chris Angelico wrote:
> Invented because there weren't enough markup languages, so we needed another?
Anything You Can Do I Can Do Better
https://www.youtube.com/watch?v=_UB1YAsPD6U
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DFS wrote:
> Typical cases:
> lines = [('one\ntwo\nthree\n')]
> print(str(lines[0]).splitlines())
> ['one', 'two', 'three']
>
> lines = [('one two three\n')]
> print(str(lines[0]).split())
> ['one', 'two', 'three']
>
>
> That's the result I'm wanting, but I get data in a slightly
Neil Schemenauer added the comment:
[Larry]
> The one thing I guess I never mentioned is that building and working with the
> prototype was frightful; it had both Python code and C code, and it was
> fragile and hard to get working.
I took Larry's PR and did a fair amount o
Neil Schemenauer added the comment:
Another small correction, _PyType_IS_GC() checks only the type flag
(Py_TPFLAGS_HAVE_GC). _PyObject_IS_GC() checks both the type flag and calls
tp_is_gc(), if it exists. tp_is_gc() is wart, IMHO, and it would be nice if we
can kill it off so only
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Neil Schemenauer added the comment:
Based on some testing, I think an extra type slot is not worth the extra
complication. I made some small improvements to _Py_Dealloc and now the
performance seems a bit better. Basically, I expanded _PyObject_IS_GC() to put
the most common branches
Change by Neil Schemenauer :
Added file: https://bugs.python.org/file50220/perf-annotate-trash.txt
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Neil Schemenauer added the comment:
As I suspected, the performance impact is significant (although pretty small).
Based on Linux perf, it looks like the extra test+branch in _Py_Dealloc adds
about 1% overhead. pyperformance shows something similar, see attached reports
(pypref
Neil Schemenauer added the comment:
> I think in any case we should benchmark this because this will affect *all*
> GC types if I understand correctly and the TS mechanism had shown slowdowns
> before
We definitely need to benchmark. I would guess that adding trashcan protection
Neil Schemenauer added the comment:
> The problem of PyObject_GC_UnTrack() is just the most visible effect of the
> trashcan mecanism: tp_dealloc can be called twice, and this is *not* expected
> by the tp_dealloc API.
The fact that Py_TRASHCAN_BEGIN and Py_TRASHCAN_END can cause t
Neil Schemenauer added the comment:
I wrote a proof-of-concept as bpo-44897. PR 27718 (this issue) might a
slightly better performance but I like the other one better because it doesn't
expose so much implementation detail to extension types. Either of them
require careful review before
Change by Neil Schemenauer :
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pull_requests: +26218
pull_request: https://github.com/python/cpython/pull/27738
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New submission from Neil Schemenauer :
This is a WIP/proof-of-concept of doing away with Py_TRASHCAN_BEGIN and
Py_TRASHCAN_END and instead integrating the functionality into _Py_Dealloc.
There are a few advantages:
- all container objects have the risk of overflowing the C stack if a long
Neil Schemenauer added the comment:
I was thinking about this more today and I think the better fix is to actually
build the trashcan mechanism into _Py_Dealloc(). Requiring that types opt-in
to the trashcan mechanism by using the trashcan macros is not ideal.
First, the trashcan macros
Neil Schemenauer added the comment:
Since C99 is now allowed, perhaps we should suggest that declarations go after
Py_TRASHCAN_BEGIN, e.g.
mytype_dealloc(mytype *p)
{
Py_TRASHCAN_BEGIN(p, mytype_dealloc)
... declarations go here
Neil Schemenauer added the comment:
For examples of bugs caused by forgetting the untrack calls, see bpo-31095.
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Neil Schemenauer added the comment:
Extensions that call PyObject_GC_UnTrack before calling Py_TRASHCAN_BEGIN will
still work, they will just take a very minor performance hit. I don't think it
is worth the trouble to introduce new macros for that reason. Extensions that
really care about
Change by Neil Schemenauer :
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pull_requests: +26201
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pull_request: https://github.com/python/cpython/pull/27718
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Neil Schemenauer added the comment:
I'm thinking that the explicit call to PyObject_GC_UnTrack should be made
unnecessary by integrating it into the trashcan code. That way, we avoid
someone else running into this kind of bug in the future. See bpo-44881.
--
nosy: +nascheme
New submission from Neil Schemenauer :
The fix for bpo-33930 includes a somewhat mysterious comment:
// The Py_TRASHCAN mechanism requires that we be able to
// call PyObject_GC_UnTrack twice on an object.
I wonder if we can just integrate the untrack into the body of the trashcan
Jach Feng wrote:
> I want to distinguish between numbers with/without a dot attached:
>
text = 'ch 1. is\nch 23. is\nch 4 is\nch 56 is\n'
re.compile(r'ch \d{1,}[.]').findall(text)
> ['ch 1.', 'ch 23.']
re.compile(r'ch \d{1,}[^.]').findall(text)
> ['ch 23', 'ch 4 ', 'ch 56 ']
>
>
bout and we'll find a suitable experienced speaker to act as a
mentor.
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Neil Schemenauer added the comment:
It seems to me the old behaviour (don't forward hash) was done for good
reasons. If the referent might go away, it is not valid to use it as a dict
key since the hash and eq result changes. If it can't go away, what reason is
there to use a weakref
Neil Girdhar added the comment:
FYI: https://github.com/PyCQA/pylint/issues/4586
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New submission from Neil Schemenauer :
Note: This is a proof of concept and not ready for merging as is.
This is based on 'frozen_modules' from Jeethu Rao , via
Larry Hastings. Larry's git branch was:
g...@github.com:larryhastings/cpython.git
Change by Neil Schemenauer :
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act as a mentor.
If you want to present something that doesn't fit into the two talk
categories at PyCon ZA, please contact the organising committee at
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Officially April-Fools Day is over (here), but...
On 01/04/2021 19.25, Chris Angelico wrote:
> On Thu, Apr 1, 2021 at 3:36 PM dn via Python-list
> wrote:
>>
>> On 01/04/2021 13.54, Chris Angelico wrote:
>>> Real and imaginary are the same thing, just rotated a quarter turn
>>
>> In which
Neil Schemenauer added the comment:
> If MTE is actually being used, system software assigns "random" values to 4
> of the higher-order bits.
Oh, interesting.
Two ideas about handling that: we could change our assertion check to be
different on ARM platforms that we kno
Neil Schemenauer added the comment:
It seems to not be specific to S390, same kind of failure on the PPC64LE RHEL8
LTO + PGE 3.x tester:
Exception ignored in:
Traceback (most recent call last):
File
"/home/buildbot/buildarea/3.x.cst
Neil Schemenauer added the comment:
Seems this failure might be back. At least, the traceback looks quite similar
to me.
The buildbot failed with this:
heads/master:85b6b70589, Mar 29 2021, 22:53:15
0:05:26 load avg: 3.95 [426/427] test_tokenize passed (56.0 sec) -- running:
test_asyncio
Neil Schemenauer added the comment:
I've merged PR 14474 so you can just test with an up-to-date "main" branch and
see if that fixes the problem. I would expect it should fix the problem since
with the radix tree arena tracking, no memory unsanitary behaviour remains.
-
Change by Neil Schemenauer :
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Neil Schemenauer added the comment:
New changeset 85b6b70589c187639aeebc560d67e9cc04abb4d8 by Neil Schemenauer in
branch 'master':
bpo-37448: Use radix tree for pymalloc address_in_range(). (GH-14474)
https://github.com/python/cpython/commit/85b6b70589c187639aeebc560d67e9cc04abb4d8
Neil Schemenauer added the comment:
Not sure the proper place to discuss this but I wonder if putting this stdlib
module names list in the executable is the best idea. The list of available
stdlib modules could change after compiling Python. I understand you don't
want to dynamically
Neil Schemenauer added the comment:
New changeset 87ec26b812e9c4095c017dc60f246eda37b83ab2 by Neil Schemenauer in
branch 'master':
bpo-43372: Use _freeze_importlib for regen-frozen. (GH-24759)
https://github.com/python/cpython/commit/87ec26b812e9c4095c017dc60f246eda37b83ab2
Change by Neil Schemenauer :
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Neil Schemenauer added the comment:
New changeset 87ec26b812e9c4095c017dc60f246eda37b83ab2 by Neil Schemenauer in
branch 'master':
bpo-43372: Use _freeze_importlib for regen-frozen. (GH-24759)
https://github.com/python/cpython/commit/87ec26b812e9c4095c017dc60f246eda37b83ab2
Change by Neil Schemenauer :
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Change by Neil Schemenauer :
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pull_request: https://github.com/python/cpython/pull/24759
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Change by Neil Schemenauer :
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Neil Schemenauer added the comment:
It seems it is enough to make a new commit. The CI seems to re-base and re-run
the PR. At least, it worked on two of my PRs.
--
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Change by Neil Schemenauer :
--
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pull_requests: +23494
pull_request: https://github.com/python/cpython/pull/24713
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New submission from Neil Schemenauer :
While I was fixing the regen-frozen issue, I noticed it seems unnecessary to
have regen-stdlib-module-names separate from regen-all. Maybe Victor knows why
it needs to be separate. If it doesn't need to be separate, the CI scripts can
be slightly
Neil Schemenauer added the comment:
I think it may be related to bpo-41561. There is a bug in the Ubuntu tracker
as well:
https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1899878
I agree with the temporary fix to use "ubuntu-18.04" for CI testing.
--
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Change by Neil Schemenauer :
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Change by Neil Schemenauer :
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Change by Neil Schemenauer :
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pull_requests: +23490
pull_request: https://github.com/python/cpython/pull/24712
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New submission from Neil Schemenauer :
In bug #43372, we didn't notice that the code for the __hello__ module was not
re-generated. Things seems to be okay but the line number table was corrupted.
It seems a good idea to add a small test to ensure that doesn't happen again.
I marked
Change by Neil Schemenauer :
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pull_requests: +23484
stage: -> patch review
pull_request: https://github.com/python/cpython/pull/24708
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Change by Neil Schemenauer :
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nosy_count: 7.0 -> 8.0
pull_requests: +23485
pull_request: https://github.com/python/cpython/pull/24708
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Neil Schemenauer added the comment:
I believe the line table format got changed but the frozen code didn't get
re-generated. If you try to call co_lines() on the __hello__ code, Python
crashes.
>>> import __hello__
Hello world!
>>> co = __hello__.__spec__.loader.g
Change by Neil Schemenauer :
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Change by Neil Schemenauer :
Added file: https://bugs.python.org/file49834/perf_compare_radix4x.txt
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Added file: https://bugs.python.org/file49833/perf_compare_noradix.txt
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Neil Schemenauer added the comment:
New changeset 44fe32061d60f4bd9c4fa48c24e3e4ba26033dba by Neil Schemenauer in
branch '3.9':
[3.9] bpo-43288: Fix bug in test_importlib test. (GH-24616)
https://github.com/python/cpython/commit/44fe32061d60f4bd9c4fa48c24e3e4ba26033dba
Change by Neil Schemenauer :
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pull_request: https://github.com/python/cpython/pull/24616
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Neil Schemenauer added the comment:
New changeset 84f7afe65c29330f3ff8e318e054b96554a2dede by Neil Schemenauer in
branch 'master':
Fix failed merge of bpo-43288. (GH-24614)
https://github.com/python/cpython/commit/84f7afe65c29330f3ff8e318e054b96554a2dede
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