Re: Conda create with python version fails me

Den 2025-11-14 skrev Stefan Ram : > Martin =?UTF-8?Q?Sch=C3=B6=C3=B6n?= wrote or quoted: >>If I try to specify a python version I don't get a new environment. The >>error message I get is: >>"The following packages are missing from the target environment: >> - python=3.10" >> (if I asked for ver

Re: Sending FDs over UNIX domain sockets

On 2025-11-16, Pokemon Chw via Python-list wrote: > On Linux AF_UNIX + SOCK_STREAM sockets, there is a quirk in how the > kernel handles control messages with SCM_RIGHTS: > > To successfully pass file descriptors via SCM_RIGHTS, you must send > at least one byte of normal data in the same sendmsg

Re: zipapp: add compression (method), compresslevel options from Zipfile

You have some demo code for it? Kind Regards, Abdur-Rahmaan Janhangeer about | blog github Mauritius On Mon, 10 Nov 2025, 07:18 Mingye Wang via Python-list, < [email protected]>

Re: Conda create with python version fails me

Den 2025-11-13 skrev Loris Bennett : Hi Loris, Thanks for quick respons. > Martin Schöön writes: > >> >> I want to create a new environment using a specific python version >> rather than leaving that to conda. Cheat-sheets and online conda >> documentation tell me to use: >> >> conda create -n

Re: Conda create with python version fails me

Hi Martin, Martin Schöön writes: > About two years ago I moved from pip to conda. I have been happy with > conda until yesterday. > > I want to create a new environment using a specific python version > rather than leaving that to conda. Cheat-sheets and online conda > documentation tell me to

Re: argsparse: allowing --version without mandatory options

Loris Bennett wrote: > "Loris Bennett" writes: > >> Hi, >> >> I am writing a program for the command-line which uses 'argsparse'. I >> want to make some options mandatory by setting 'required=True', but >> still allow the program to run with the option '--version' (which just >> shows the versio

Re: argsparse: allowing --version without mandatory options

On 2025-10-30 13:47:16 -0400, [email protected] wrote: > On 2025-10-30 at 13:50:42 +0100, > Loris Bennett wrote: > > "Loris Bennett" writes: > > > I am writing a program for the command-line which uses 'argsparse'. I > > > want to make some options mandatory by setting 'required

Re: argsparse: allowing --version without mandatory options

On 2025-10-31 at 09:09:08 +, Anders Munch wrote: > From: [email protected] <[email protected]>: > > Don't take this the wrong way, but what, exactly, is a mandatory option? > > It's a named argument. Okay. > Positional arguments intermixed with options can

Re: argsparse: allowing --version without mandatory options

From: [email protected] <[email protected]>: > Don't take this the wrong way, but what, exactly, is a mandatory option? It's a named argument. Positional arguments intermixed with options can get confusing. When you see aprogram.py --a --b c --d --e is 'c' t

Re: argsparse: allowing --version without mandatory options

On 10/30/25 11:47, [email protected] wrote: On 2025-10-30 at 13:50:42 +0100, Don't take this the wrong way, but what, exactly, is a mandatory option? Perhaps an argument that must be given in order to specify a value that has no default (not that I'd do that, personally). O

Re: argsparse: allowing --version without mandatory options

On 2025-10-30 at 13:50:42 +0100, Loris Bennett wrote: > "Loris Bennett" writes: > > I am writing a program for the command-line which uses 'argsparse'. I > > want to make some options mandatory by setting 'required=True', but > > still allow the program to run with the option '--version' (whic

Re: argsparse: allowing --version without mandatory options

"Loris Bennett" writes: > Hi, > > I am writing a program for the command-line which uses 'argsparse'. I > want to make some options mandatory by setting 'required=True', but > still allow the program to run with the option '--version' (which just > shows the version and then exits) even if the m

Re: Formatted Integer With Specified Number Of Digits

On 10/24/25 4:38 AM, Alan Bawden wrote: > Paul Rubin writes: > >Lawrence D’Oliveiro writes: >> >>> "%#0.3x" % 2 >> '0x002' > >f'0x{2:03x} > > Won't work for negative numbers. That's true. For negative numbers the padding would have to be Fs instead of 0s. -- https:/

Re: Formatted Integer With Specified Number Of Digits

Paul Rubin writes: Lawrence D’Oliveiro writes: > >>> "%#0.3x" % 2 > '0x002' f'0x{2:03x} Won't work for negative numbers. -- Alan Bawden -- https://mail.python.org/mailman3//lists/python-list.python.org

Re: Proposal to update Unicode handling for German sharp S (ß / ẞ) in Python’s case conversion methods

On 10/22/25 7:14 PM, Chris Angelico via Python-list wrote: > And that's why it's so frustrating when someone bases their entire > argument on an AI's nonsense. If the OP had simply posted it as a > request, with no hallucinated claims, it would have been a > straight-forward matter to explain the U

Re: Proposal to update Unicode handling for German sharp S (ß / ẞ) in Python’s case conversion methods

On Thu, 23 Oct 2025 at 12:01, Michael Torrie via Python-list wrote: > > On 10/19/25 12:38 PM, Chris Angelico via Python-list wrote: > > The entire premise of your post was flat-out wrong. Your data was > > nothing but hallucinations, and there is nothing to discuss. I'm not > > even going to bothe

Re: Proposal to update Unicode handling for German sharp S (ß / ẞ) in Python’s case conversion methods

On 10/19/25 12:38 PM, Chris Angelico via Python-list wrote: > The entire premise of your post was flat-out wrong. Your data was > nothing but hallucinations, and there is nothing to discuss. I'm not > even going to bother reading further, because every post you've > written smells like AI slop. In

Re: Formatted Integer With Specified Number Of Digits

Lawrence D’Oliveiro wrote: > Formatting an integer with 3 digits, excluding base specifier: > > >>> "%#0.3x" % 2 > '0x002' > > No equivalent to this in any of the other ways that Python allows for > formatting: > > >>> format(2, "#03x") > '0x2' > > (Not what I want) > > >>>

Re: Proposal to update Unicode handling for German sharp S (ß / ẞ) in Python’s case conversion methods

On Mon, 20 Oct 2025 at 02:01, wrote: > > Thanks again for your detailed reply — I really appreciate it. I have to > admit, I wasn’t 100% sure about my data, which is why I submitted it for > discussion before opening a bug report to the Python developers. > Don't. Don't open a discussion based

Re: Proposal to update Unicode handling for German sharp S (ß / ẞ) in Python’s case conversion methods

Thanks again for your detailed reply — I really appreciate it. I have to admit, I wasn’t 100% sure about my data, which is why I submitted it for discussion before opening a bug report to the Python developers. I alredy checked Unicode tables, I saw that the capital ß (U+1E9E) was already encod

Re: Proposal to update Unicode handling for German sharp S (ß / ẞ) in Python’s case conversion methods

On Sun, 19 Oct 2025 at 11:03, wrote: > > Thanks Chris for the response! > > As The Unicode Standard does define an uppercase form for the German sharp S > (U+00DF → U+1E9E), and this has been part of Unicode since version 5.1 > (2008), with the German orthography officially adopting it in 2017.

Re: Proposal to update Unicode handling for German sharp S (ß / ẞ) in Python’s case conversion methods

Thanks Chris for the response! As The Unicode Standard does define an uppercase form for the German sharp S (U+00DF → U+1E9E), and this has been part of Unicode since version 5.1 (2008), with the German orthography officially adopting it in 2017. The relevant case mappings are clearly specified

Re: Slices by length

On 06/09/2025 17:21, MRAB wrote: On 2025-09-06 13:47, Rob Cliffe via Python-list wrote: I quite often find myself writing expressions of the form       someString[x : x+n] where n is often an int and x may be an int, a variable, or a (possibly complicated) expression. It would be more natural

Re: Proposal to update Unicode handling for German sharp S (ß / ẞ) in Python’s case conversion methods

Hello friends, Can I know what’s going on?! Please في سبت، 18 أكتوبر، 2025 في 7:11 ص، كتب Chris Angelico via Python-list < [email protected]>: > On Sat, 18 Oct 2025 at 13:44, wrote: > > > > Dear Python Developers, > > > > I would like to bring attention to an inconsistency and legacy behavi

Re: Slices by length

Sent from my iPad > On Oct 7, 2025, at 9:59 PM, Rob Cliffe via Python-list > wrote: > > In fairness, it is already possible to write > s[x:][:n] > which gives the "right" answer if n is non-negative, and is quite readable, > although this is slower than s[x:x+2], at least in tests that I

Re: Slices by length

On 08/10/2025 03:21, Richard Damon wrote: Sent from my iPad On Oct 7, 2025, at 9:59 PM, Rob Cliffe via Python-list wrote: In fairness, it is already possible to write s[x:][:n] which gives the "right" answer if n is non-negative, and is quite readable, although this is slower than s[

Re: Python 3.14.0 (final) is here!

On Oct 7, 2025, at 13:14, Abdur-Rahmaan Janhangeer via Python-list wrote: > > Very sad ... At least as Steve Dower suggested even if we could get an > email from Discourse or something. I too will miss these announcements. I understand not having to post things to multiple places, but forwardi

Re: Python 3.14.0 (final) is here!

Am Wed, Oct 08, 2025 at 10:51:42AM +0200 schrieb Jean-François Bachelet via Python-list: > at least a mailing list is way more frugal. and internet friendly. And above all, PUSH rather than PULL. Karsten -- GPG 40BE 5B0E C98E 1713 AFA6 5BC0 3BEA AC80 7D4F C89B -- https://mail.python.org/mai

Re: Slices by length

On 07/10/2025 20:37, Thomas Passin wrote: On 10/7/2025 2:49 PM, Rob Cliffe via Python-list wrote: On 06/09/2025 17:21, MRAB wrote: On 2025-09-06 13:47, Rob Cliffe via Python-list wrote: I quite often find myself writing expressions of the form       someString[x : x+n] where n is often an

Re: Slices by length

On 10/7/2025 2:49 PM, Rob Cliffe via Python-list wrote: On 06/09/2025 17:21, MRAB wrote: On 2025-09-06 13:47, Rob Cliffe via Python-list wrote: I quite often find myself writing expressions of the form       someString[x : x+n] where n is often an int and x may be an int, a variable, or a (po

Re: Proposal to update Unicode handling for German sharp S (ß / ẞ) in Python’s case conversion methods

On Sat, 18 Oct 2025 at 13:44, wrote: > > Dear Python Developers, > > I would like to bring attention to an inconsistency and legacy behavior > regarding the handling of the German sharp S characters in Python’s string > case conversion methods. > This isn't Python's decision. The definition of

Re: Python 3.14.0 (final) is here!

Hello Python Team ^^) It's indeed VERY sad that you would kill these mailing list !  we are a lot NOT using hungry ressources stuff like discuss, discord, or others that require a web browser to read at least a mailing list is way more frugal. and internet friendly. Cheers, Jeff Le 07

Re: Slices by length

dy 'help' to > [email protected] > >You can reach the person managing the list at > [email protected] > >When replying, please edit your Subject line so it is more specific >than "Re: Contents of Python-list digest..." -- https://mail.python.org/mailman3//lists/python-list.python.org

Re: Python 3.14.0 (final) is here!

Very sad ... At least as Steve Dower suggested even if we could get an email from Discourse or something. Kind Regards, Abdur-Rahmaan Janhangeer about | blog github Mauritius On Tue,

Re: Detailed documentation or specs for behavior of descriptors in attributes of metaclasses

In case anyone stumbles upon this, here's my question and partial self-answer on Stack Overflow: https://stackoverflow.com/a/79765602/396373 -- https://mail.python.org/mailman3//lists/python-list.python.org

Re: can you improve this text-only beginner copy program?

On 2025-08-28 21:15:11 +0100, Mark Bourne wrote: > I don't know if Sphinx can extract types from type hints but, at least if > the docstring is just for humans reading the code, using those can reduce > the markup in the docstring: > ``` > def copy(s: int, d: int) -> None: > """ > Copy the

Re: Test message. Posted a question several days ago and don't see it.

On 9/10/25 21:15, Steve Jorgensen via Python-list wrote: > I posted a question here several days ago and received a "Welcome to the "Python-list" mailing list!" > email, but I still don't see my question in the list. > > I'm posting this mainly to see if it shows up, or I get a reply from a mod

Re: Test message. Posted a question several days ago and don't see it.

Well, that was the more important thing to do. :) -- https://mail.python.org/mailman3//lists/python-list.python.org

Re: Python: The Documentary | An Origin Story

Lawrence D’Oliveiro writes: > Interviews with GvR and many others about their part in the origins and > rise to prominence of what currently seems to be the world’s most popular > programming language. In 4K! > > Thanks. FWIW, the Computer History

Re: staticmethod(cls)

On 9/4/25 13:28, Pierre Asselin wrote: For reasons I won't go into I ended up defining classes inside of a class body. That's not in the manual, but I see no reason it would fail. Nested classes certainly work. I've seen them used quite a bit in testing code, where you may want an object which

Re: an adventure: a Lisp-style linked list

[email protected] (Pierre Asselin) writes: > Ethan Carter wrote: > >> def __init__(self, d, ls): >> self.head = d >> self.tail = ls > > Why not > def __init__(self, d, ls=None): > > and avoid the need for a List.Empty ? Thanks! That's a good suggestion. -- https://mail.pyt

Re: Test message. Posted a question several days ago and don't see it.

Hi Steve, ask away... On 11/09/25 16:15, Steve Jorgensen via Python-list wrote: I posted a question here several days ago and received a "Welcome to the "Python-list" mailing list!" email, but I still don't see my question in the list. I'm posting this mainly to see if it shows up, or I get a

Re: Drop into REPL when your program crashes.

Annada Behera writes: > Hi, > > Recently I have been increasingly adding this piece of code as > a preamble to a lot of my code. > > import (sys, os, ipdb) > > def debug_hook(exc_type, exc_value, traceback): > if exc_type is KeyboardInterrupt: > sys.__excepthook__(exc_

Re: Drop into REPL when your program crashes.

So, ipdb is the ipython version of pdb. In fact, post_mortem is a pdb function. I use ipdb because its REPL is a bit nicer to work with then pdb. -Original Message- From: Stefan Ram Subject: Re: Drop into REPL when your program crashes. Date: 09/08/2025 06:04:16 PM Newsgroups

Re: an adventure: a Lisp-style linked list

Ethan Carter wrote: > def __init__(self, d, ls): > self.head = d > self.tail = ls Why not def __init__(self, d, ls=None): and avoid the need for a List.Empty ? -- pa at panix dot com -- https://mail.python.org/mailman3//lists/python-list.python.org

Re: Slices by length

On 7/09/25 00:47, Rob Cliffe via Python-list wrote: I quite often find myself writing expressions of the form     someString[x : x+n] where n is often an int and x may be an int, a variable, or a (possibly complicated) expression. 0 A PEP 1 A helper-function eg slice_by_length( input_string

Re: Slices by length

On 2025-09-06 13:47, Rob Cliffe via Python-list wrote: I quite often find myself writing expressions of the form     someString[x : x+n] where n is often an int and x may be an int, a variable, or a (possibly complicated) expression. It would be more natural to be able to specify the slice not

Re: Error installing matplotlib

On 03/09/2025 15:45, Oscar Benjamin wrote: On Wed, 3 Sep 2025, 15:40 Rob Cliffe, wrote: On 03/09/2025 15:35, Oscar Benjamin wrote: On Wed, 3 Sep 2025, 15:21 Rob Cliffe via Python-list, wrote: On 03/09/2025 14:59, Mats Wichmann wrote: > On 9/3/25 07:20, R

Re: Environments and Version Control (if not packaging and PyPI)

I record the URLs used by pip to download the packages that I managed to get to work, and during CI / routine development, I'd use a script to re-download the packages from those URLs, skipping all and any interactions with pip (or uv). This makes it a lot faster and, more importantly, a lot more

Re: Image enhance

On 2025-09-03 13:06, AM CR via Python-list wrote: Good morning everyone. First of all, thank you in advance for your advice and suggestions. After a few attempts, I've come to the conclusion that working on Windows XP isn't very reasonable, given the many advances available. I'll try this on a

Re: Image enhance

Good morning everyone. First of all, thank you in advance for your advice and suggestions. After a few attempts, I've come to the conclusion that working on Windows XP isn't very reasonable, given the many advances available. I'll try this on a Windows 7 Home machine. I'd appreciate it if someo

Re: Error installing matplotlib

It's never a good idea to run pip install without --only-binary. This should be the default that you never change. The current default is a security hazard as well as leads you to the situation you are in with no good way of debugging the problem. What you could try doing: download the wheel you a

Re: Error installing matplotlib

On Wed, 3 Sep 2025, 15:40 Rob Cliffe, wrote: > > > On 03/09/2025 15:35, Oscar Benjamin wrote: > > > > On Wed, 3 Sep 2025, 15:21 Rob Cliffe via Python-list, < > [email protected]> wrote: > >> >> >> On 03/09/2025 14:59, Mats Wichmann wrote: >> > On 9/3/25 07:20, Rob Cliffe wrote: >> >> >> >> >

Re: Error installing matplotlib

On 03/09/2025 15:35, Oscar Benjamin wrote: On Wed, 3 Sep 2025, 15:21 Rob Cliffe via Python-list, wrote: On 03/09/2025 14:59, Mats Wichmann wrote: > On 9/3/25 07:20, Rob Cliffe wrote: >> >> >> On 03/09/2025 00:01, Mats Wichmann wrote: >>> On 9/2/25 14:51, Rob Clif

Re: Error installing matplotlib

On Wed, 3 Sep 2025, 15:21 Rob Cliffe via Python-list, < [email protected]> wrote: > > > On 03/09/2025 14:59, Mats Wichmann wrote: > > On 9/3/25 07:20, Rob Cliffe wrote: > >> > >> > >> On 03/09/2025 00:01, Mats Wichmann wrote: > >>> On 9/2/25 14:51, Rob Cliffe via Python-list wrote: > > > > >

Re: Error installing matplotlib

On 03/09/2025 14:59, Mats Wichmann wrote: On 9/3/25 07:20, Rob Cliffe wrote: On 03/09/2025 00:01, Mats Wichmann wrote: On 9/2/25 14:51, Rob Cliffe via Python-list wrote: There are two roots here: (1) it's not finding a prebuilt wheel.  You can see that because it's proposing to use the

Re: Error installing matplotlib

On 9/3/25 07:20, Rob Cliffe wrote: On 03/09/2025 00:01, Mats Wichmann wrote: On 9/2/25 14:51, Rob Cliffe via Python-list wrote: There are two roots here: (1) it's not finding a prebuilt wheel.  You can see that because it's proposing to use the source distribution instead: > Collecting

Re: Error installing matplotlib

On 03/09/2025 00:01, Mats Wichmann wrote: On 9/2/25 14:51, Rob Cliffe via Python-list wrote: There are two roots here: (1) it's not finding a prebuilt wheel.  You can see that because it's proposing to use the source distribution instead: > Collecting matplotlib >    Using cached matplot

Re: Error installing matplotlib

On 9/2/25 14:51, Rob Cliffe via Python-list wrote: Hello, can anyone help?  All assistance gratefully received.  I am running python 3.13.3 on a Windows 11 machine and trying to do     pip install matplotlib (No, I don't need to say "python -m ...", I am running the right version of python.exe

Re: Image enhance

On Tue, Sep 2, 2025 at 1:46 PM amrodi--- via Python-list wrote: > > I'm new to Python. > Operating System - Windows XP SP3 > Python 2.7 installed. > > I got a script that tries to improve the image? > I created a bat file using the command line. > > C:\python27\python.exe d:\temp\teste.py > >

Re: Image enhance

On 9/2/2025 11:29 AM, amrodi--- via Python-list wrote: I'm new to Python. Operating System - Windows XP SP3 Python 2.7 installed. I got a script that tries to improve the image? I created a bat file using the command line. C:\python27\python.exe d:\temp\teste.py But even though it runs, it

Re: Access to return / exception context in finally block

>def f(x): > try: > quot = 10 / x > except ZeroDivisionError as exc: > log_error(exc) > return 0 > else: > log_return(quot) > return quot + 1 > finally: > "Any cleanup processing needed before returning" This involves defining the new

Re: Image enhance

My code from PIL import Image, ImageEnhance import matplotlib.pyplot as plt import numpy as np import cv2 # Original image path image_path = "D:\temp\STC.jpg" # Altere se estiver em outro local original_image = Image.open(image_path) # Convert to OpenCV to apply enhancements cv_image = cv2.cvtC

Re: Access to return / exception context in finally block

On 01/09/2025 14:26, marius.spix--- via Python-list wrote: In your example when would isinstance(__exit_context__, ReturnContext) be True and when would it be False? What would __exit_context__.value be? I can't think of a sensible meaning for it. If no exception occurs, is the value returned

Re: Access to return / exception context in finally block

On 01/09/2025 14:26, marius.spix--- via Python-list wrote: In your example when would isinstance(__exit_context__, ReturnContext) be True and when would it be False? What would __exit_context__.value be? I can't think of a sensible meaning for it. If no exception occurs, is the value returned b

Re: Access to return / exception context in finally block

>In your example when would isinstance(__exit_context__, ReturnContext) >be True and when would it be False? What would __exit_context__.value >be? I can't think of a sensible meaning for it. If no exception occurs, >is the value returned by f supposed to be 10/x or __exit_context__.value >+ 1

Re: Python documentary

Good afternoon. It was a nice listening. Thank you for sharing this movie. I think, that it would be beneficial to have this distributed over P2P networks such as BitTorrent, eD2k, Gnutella, IPFS, et cetera. Speaking of which, I suppose that those mentioned organizations funded this production i

Re: Access to return / exception context in finally block

Well, this is the classic example of reinventing Lisp. But why do it incrementally and in this ridiculously inconvenient way? For those unaware of the history: https://gigamonkeys.com/book/beyond-exception-handling-conditions-and-restarts this is an informal explanation of the mechanism. Better ye

Re: Access to return / exception context in finally block

On 30/08/2025 12:03, marius.spix--- via Python-list wrote: Dear mailing list, there is currently no direct way to observe the current interpreter state in a finally block without tracing. My idea is introducing an immutable __exit_context__ magic variable, which would have one of three poss

Re: Python documentary

> Had this 'live-test' failed, where would Python be today? I'm not sure if this is irony or do you honestly believe it succeeded... but I think that "where Python is today" is pretty indicative of failure. To me, however, the failure started with the whole Python 3.X project, Guido being forced i

Re: Python documentary

On Fri, Aug 29, 2025 at 3:37 PM Larry Martell via Python-list < [email protected]> wrote: > https://www.youtube.com/watch?v=GfH4QL4VqJ0 > > Watched this last night. Overall I enjoyed it (but my wife, who is not a > programmer, fell asleep). My only quibble is that they spent too much time > t

Re: Python documentary

hange to the Python language, but back-then was an important period in the history of the Python Community deserving coverage in the movie. PPS no wish to re-ignite debate over the 'walrus operator' ("assignment expression", ie `a := 6`) Web.Refs: https://docs.python.org/3/

Re: can you improve this text-only beginner copy program?

The suggestion (below) is good-practice. However, it's advanced-Python compared to the OP's first-course progress. What is disappointing, is that instead of general strings as file-names the class has not been introduced to pathlib (https://docs.python.org/3/library/pathlib.html). PS Ethan:

Re: can you improve this text-only beginner copy program?

On 29/08/25 10:52, Grant Edwards via Python-list wrote: On 2025-08-28, Mark Bourne wrote: Ethan Carter wrote: PS. Is it just me or there's just us in this used-to-be-very-active group? Thanks for being my teacher here. Have a good day! Until a few months ago, there was a gateway that for

Re: can you improve this text-only beginner copy program?

On 2025-08-28, Mark Bourne wrote: > Ethan Carter wrote: >> PS. Is it just me or there's just us in this used-to-be-very-active >> group? Thanks for being my teacher here. Have a good day! >> > > Until a few months ago, there was a gateway that forwarded messages both > ways between this newsg

Re: can you improve this text-only beginner copy program?

Stefan Ram wrote: Ethan Carter wrote or quoted: def copy(s, d): """Copies text file named S to text file named D.""" with open(s) as src: with open(d, "w") as dst: try: dst.write(src.read()) except Exception: os.remove(d) raise In Python there ar

Re: can you improve this text-only beginner copy program?

Ethan Carter wrote: PS. Is it just me or there's just us in this used-to-be-very-active group? Thanks for being my teacher here. Have a good day! Until a few months ago, there was a gateway that forwarded messages both ways between this newsgroup and a mailing list. It seems to have stop

Re: can you improve this text-only beginner copy program?

On 2025-08-28, Roel Schroeven wrote: >> If an OS did let you delete an open file, how would you expect it to >> behave? Would you still be able to use the file? Would the file be >> marked for deletion and be deleted when it was finally closed? > Unix-like operating systems do let you delete a

Re: can you improve this text-only beginner copy program?

Op 28/08/2025 om 18:02 schreef MRAB: On 2025-08-28 03:08, Grant Edwards via Python-list wrote: In the event of an exception, you attempt to remove the destination file BEFORE exiting the `with` statement. While that might succeed on some platforms, it will potentially fail on others. Specifica

Re: can you improve this text-only beginner copy program?

On 2025-08-28 03:08, Grant Edwards via Python-list wrote: On 2025-08-27, Chris Angelico via Python-list wrote: On Thu, 28 Aug 2025 at 01:28, Ethan Carter wrote: def copy(s, d): """Copies text file named S to text file named D.""" with open(s) as src: with open(d, "w") as dst: tr

Re: can you improve this text-only beginner copy program?

On 8/27/2025 1:45 PM, Stefan Ram wrote: Ethan Carter wrote or quoted: You're right. There's no written statement. The exercise was suggested by the teacher while in class. It was something like ``write a program that copies text files by getting source and destination via the command-line.''

Re: can you improve this text-only beginner copy program?

On 2025-08-27, Chris Angelico via Python-list wrote: > On Thu, 28 Aug 2025 at 01:28, Ethan Carter wrote: >> def copy(s, d): >> """Copies text file named S to text file named D.""" >> with open(s) as src: >> with open(d, "w") as dst: >> try: >> dst.write(src.read()) >>

Re: can you improve this text-only beginner copy program?

[email protected] (Stefan Ram) writes: > Ethan Carter wrote or quoted: >>Can you think of anything I'm missing? > > The correctness of a program as a solution to an assignment > depends on the exact wording of the assignment, so it's a > bit difficult to say without seeing it. You'r

Re: can you improve this text-only beginner copy program?

On 27/08/2025 18.57, Ethan Carter wrote: [...] """Copies text file named S to text file named D.""" This is not entirely clear, since case is significant in Python ("S" is not the same as "s"), and it is ambiguous whether it refers to a file actually named "S" or to a file whose name

Re: can you improve this text-only beginner copy program?

On 8/27/25 08:03, Ethan Carter wrote: The program below only copies text files on purpose---because we haven't learned about binary files in this course yet. So just an observation on this topic (to squirrel away for future reference): if you never look at contents of the data at all, and it'

Re: can you improve this text-only beginner copy program?

On Thu, 28 Aug 2025 at 01:28, Ethan Carter wrote: > def copy(s, d): > """Copies text file named S to text file named D.""" > with open(s) as src: > with open(d, "w") as dst: > try: > dst.write(src.read()) > except Exception: > os.remove(d) > raise > In

Re: not understanding the result of functools.reduce

[email protected] (Stefan Ram) writes: > Ethan Carter wrote or quoted: >>## The question is how to write such an operator. I wrote this one: >>def op(x, b): >> return isinstance(x, int) or b > > The main snag with your op function and how you're using > reduce is the switch-up in the

Re: Searching for a file

On 2025-08-05 22:11:57 -0400, Grant Edwards via Python-list wrote: > On 2025-08-05, Michael Torrie via Python-list wrote: > > On 5/24/25 7:19 PM, Chris Angelico via Python-list wrote: > >> for dir in dirs: > >> try: open(dir + "/" + fn).close() > >> except FileNotFoundError: pass > >>

Re: Searching for a file

On 2025-08-04 19:22:23 -0600, Michael Torrie via Python-list wrote: > On 5/24/25 7:19 PM, Chris Angelico via Python-list wrote: > > for dir in dirs: > > try: open(dir + "/" + fn).close() > > except FileNotFoundError: pass > > else: break > > > > Is this really all that difficult? Not e

Re: Searching for a file

On 2025-08-05, Michael Torrie via Python-list wrote: > On 5/24/25 7:19 PM, Chris Angelico via Python-list wrote: >> On Sun, 25 May 2025 at 10:05, Rob Cliffe via Python-list >> wrote: >>> Yes, but if I understand correctly, they all start from a single >>> directory (and work downwards if required

Re: Searching for a file

On 5/24/25 7:19 PM, Chris Angelico via Python-list wrote: > On Sun, 25 May 2025 at 10:05, Rob Cliffe via Python-list > wrote: >> Yes, but if I understand correctly, they all start from a single >> directory (and work downwards if required). >> My suggestion involved searching a *list* (possibly mu

RE: configparser get non-existent boolean

Rob Cliffe wrote: > I was surprised to find that in configparser, getboolean() does not raise > KeyError for a non-existent config parameter. > Is there a good reason for this? History and backwards compatibility. The configparser module has some years on it. The rationale for this sort of thi

Re: Assignment of global variables in a script.

On 6/30/2025 11:53 PM, Popov, Dmitry Yu via Python-list wrote: Dear Sirs. I found the following sentence in the Python documentation: "The statements executed by the top-level invocation of the interpreter, either read from a script file or interactively, are considered part of a module called

Re: What does stats = await asyncio.to_thread(os.stat, url) do? (Was async I/O via threads is extremly slow)

On 2025-06-24 00:32:26 +0200, Mild Shock wrote: > So what does: > > stats = await asyncio.to_thread(os.stat, url) > > Whell it calls in a sparate new secondary thread: > > os.stat(url) > > It happends that url is only a file path, and > the file path points to an existing file. So the > seconda

Re: What does stats = await asyncio.to_thread(os.stat, url) do? (Was async I/O via threads is extremly slow)

On 2025-06-24 00:32:26 +0200, Mild Shock wrote: > So what does: > > stats = await asyncio.to_thread(os.stat, url) > > Whell it calls in a sparate new secondary thread: > > os.stat(url) > > It happends that url is only a file path, and > the file path points to an existing file. So the > seconda

Re: What does stats = await asyncio.to_thread(os.stat, url) do? (Was async I/O via threads is extremly slow)

Other languages uses thread pool, instead of creating new thread. In Python,loop.run_in_executor uses thread pool. https://docs.python.org/3.13/library/asyncio-eventloop.html#asyncio.loop.run_in_executor 2025年6月24日(火) 8:12 Mild Shock : > > So what does: > > stats = await asyncio.to_thread(os.sta

Re: async I/O via threads is extremly slow (Was: Does Python Need Virtual Threads?)

I honestly have no idea what's being measured, but here are some numbers to compare this to, and then some explanation about async I/O in general. 1. No I/O to a local disk on a modern controller should take milliseconds. The time you are aiming for is below millisecond. That is, writing a block t

Re: PEP Idea: Extended import syntax for aliasing module attributes

The solution was provided in this thread here: https://discuss.python.org/t/extended-import-syntax-for-aliasing-module-attributes/95920/3 The correct way to implement is: import module from module import optimize, validate as check -- https://mail.python.org/mailman3//lists/python-list.python.org

Re: PEP Idea: Extended import syntax for aliasing module attributes

Thank you. I have used this link. I had difficulty finding it. https://discuss.python.org/ -- https://mail.python.org/mailman3//lists/python-list.python.org

Re: PEP Idea: Extended import syntax for aliasing module attributes

Thank you. I have posted this idea on https://discuss.python.org/c/ideas/6 I had difficulty trying to find that. -- https://mail.python.org/mailman3//lists/python-list.python.org

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