🌐 Mailman 3 December 2019 - Python-list - python.org

Re: scrollable Frame object
by Christian Gollwitzer Dec. 28, 2019

Dec. 28, 2019

Hi David, Am 24.12.19 um 13:48 schrieb david.isal2(a)gmail.com: > thank you for your answer. I downloaded and had a look at your library, it is a great solution to use a canvas-free scrollable frame. but it is in pure tcl, how do I use this with python tkinter ? Yes, because you asked this in the Tcl/Tk newsgroup. We use Tcl directly here, not via Python Tkinter. > Although my initial request is that the frame object is not scrollable by default. > so My request for the tcl/tk developers would be, why not make the object frame scrollbale by default, in order to attach a scrollbar to it? > I believe it is a typical need. This may well be. For that, the developers of Tkinter (distinct from the developers of Tk and Tcl) have to include a scrollable frame into Tkinter. There is unfortunately a number of extension packages which exist for Tk, but which are not wrapped by a standard installatino of Tkinter for Python, despite them being extremely useful / not even possible otherwise. Among those are: * Tablelist - a great tree and multi-column widget. Much more versatile then the built-in treeview * TkDnD - native drag'n'drop support, works on all 3 OSes * tkPath - a canvas replacement with "modern" 2D features (anti-aliasing, image scaling/rotation, alpha blending) * pdf4tcl, generate PDF images from a canvas drawing * tkTable, spreadsheet-like widget * tktreectrl, yet another extremely powerful treeview / explorer like widget Building support for these packages would not be that hard, but it must be done by the Python community. Christian (X-post & Fup to clp)

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Error in python installation
by Kishor Soni Dec. 27, 2019

Dec. 27, 2019

Hello I have Intel DH61 series mother board, with Windows7 64bit + SP1 + some debugging components ( as shown in microsoft website, as service pack for W7) however when I try to install current version of python, it displays error. See the screenshot attached herewith. (board configuration displays in background window) Kishor Soni, Vid Technology, Rajkot - Gujarat. URL: www.vidtech.co.in, Landline: 0281-2225527 Cell: 093757 25527

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Re: [Q] __init__ in class
by soyeomul＠doraji.xyz Dec. 27, 2019

Dec. 27, 2019

Irv Kalb <Irv(a)furrypants.com> writes: > myObject = MyClass() # "MyClass" would be the name of a class in your code > > When you run a line like the one above, Python looks to see if that > class has a method named __init__(). If it does, then Python calls > that method of the newly created object. Very clean comments, thank you Irv^^^ INDEED. Sincerely, -- ^고맙습니다 _地平天成_ 감사합니다_^))//

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Re: [Q] __init__ in class
by soyeomul＠doraji.xyz Dec. 27, 2019

Dec. 27, 2019

Hellow DL^^^ > Please be aware that there is a Python Tutor Discussion List. Thanks for advice^^^ Sincerely, -- ^고맙습니다 _地平天成_ 감사합니다_^))//

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Re: [Q] __init__ in class
by soyeomul＠doraji.xyz Dec. 27, 2019

Dec. 27, 2019

Hellow Stefan^^^ > The class definition depends on the requirement > specification for the class. > > 클래스 정의는 클래스의 요구 사항 스펙에 따라 다릅니다. Now i got it, understood, thanks a lot^^^ Sincerely, -- ^고맙습니다 _地平天成_ 감사합니다_^))//

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[Q] __init__ in class
by soyeomul＠doraji.xyz Dec. 27, 2019

Dec. 27, 2019

in making class, why we should set "__init__"? so non-init class is useless? actually i did fail to understand __init__'s meaning. what is role of __init__ in class. sincerely, from python beginner. -- ^고맙습니다 _地平天成_ 감사합니다_^))//

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Python 3.8 and :=
by Jeff Gitlin Dec. 26, 2019

Dec. 26, 2019

With the new operator := in Python 3.8 that allows you to do things like if ( x := f() ) == 1: Is there any reason to use just the assignment operator?

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Re: Python 3.8 and :=
by Jeff Gitlin Dec. 26, 2019

Dec. 26, 2019

On Wednesday, December 25, 2019 at 9:22:56 AM UTC-5, Chris Angelico wrote: > On Thu, Dec 26, 2019 at 1:16 AM Jeff Gitlin <jeff.gitlin(a)gmail.com> wrote: > > > > With the new operator := in Python 3.8 > > that allows you to do things like > > > > if ( x := f() ) == 1: > > > > Is there any reason to use just the assignment operator? > > I don't understand the question. Are you asking why the normal "=" > operator should be used? For starters, "=" is far more flexible than > ":=" in terms of what it can assign to. > > ChrisA Chris, Can you give me a few examples of what you can do with = and not do with the new := ? Thanks Jeff

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How to call C functions from Linux C executable and vice-versa
by Manomugdha Biswas Dec. 25, 2019

Dec. 25, 2019

Hi, I have a Linux C binary (executable, not .so file). i can update (add new files/folders if it is required) but after compilation i will get a binary executable file. I want to access/call few functions of this executable from python. for this i want to use cython interface (most probably cython is the best option!). Any other possible options are also acceptable. the example/documentation of cython i have seen till now, they talk about calling c functions from c library (.so file). can you please point me to a documentation/source code which talks about how to call c functions from c-executable? Regards, Mano

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Re: Lists And Extra Commas at end
by Marco Sulla Dec. 25, 2019

Dec. 25, 2019

On Wed, 25 Dec 2019 at 00:56, Avi Gross <avigross(a)verizon.net.via.e4ward.com> wrote: > I may not be understanding what you are objecting to I, sir, am objecting that I replied to a topic, and you answered to me, but in another topic. You could have respond to me in the correct topic, and then create this other one (that I'm not really interested). Anyway. About the extra comma, it's da**ed useful: a = ( 42, 1981, 8, 19, 23, ) If I have to comment out the last line, I can, **without having to remove the comma before**. And if I have to add another number at the end, I have not to remember to add the comma before. ######## The real problem is this one: a = 1, Unreadable and prone to subtle errors, because maybe you added the comma by mistake. Caution: Debugging Nightmares. The solution, IMHO? DeprecationWarning, use (1, ) Explicit is better blablabla.

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