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General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.
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I have a large and complex PostgreSQL SELECT query that I would like to make faster. EXPLAIN suggests it should run quickly, with the worst parts being scans of a few thousand rows. When run, it do...
I need help figuring out if my dependencies need upgrading or conflict with each other. I tried using the command prompt to solve problems but it didn't help. Here is my code. Android Studio Iguan...
Is there a Python serialization format that has capabilities similar to Pickle, but is text based? The problem I always have with pickle is that it's binary, so I can't manually view or edit the d...
Background Many Python programs now recommend installing with pipx, and there is a sense that you shouldn't install with pip anymore, you should use tools like pipx. Main Question However, what ...
I need to do a lot of calculations involving sets. There are relatively few values in the "universe" of candidates that could appear in any of the sets, but potentially very many such sets (they mi...
I often find it useful to arrange things so that each commit on master's first-parent is a discrete change. It allows git log --first-parent --oneline to be used as a concise, automatically-generat...
This revolves around images. I'm trying to write an HTML page of COVID-19 safety procedures, and here's what I've written so far: <!DOCTYPE html> <html> <head> <title&...
I am in need of downloading some files (from dynamic list of URLs) and archive them into a single zip file. Since these files can be arbitrarily sized (totaling hundreds of MB), I want to avoid dow...
I regularly run into the problem that I have a Python function that I want to use in both, eager and graph execution mode. I therefore have to adjust the code so that it can handle both situations....
Consider the following arbitrarily-nested JSON as input to a jq filter: echo '[{"foo": [1, 2]}, {"bar": [{"baz": ["foo", "baz"]}]}]' | jq '.' My goal is to join leaf arrays into strings: [{"fo...
TL;DR Is (a and b) equivalent to tf.logical_and(a, b) in terms of optimization and performance? (a and b are tensorflow tensors) Details I use Python with Tensorflow. My priorities are Make t...
I use git submodule foreach git pull to update my submodules. There's quite a few and it appears that foreach is updating them one by one, instead of in parallel. How can I do it in parallel?
I have a Python program like this: done = False while u and not done: i = u.pop() print(f"Processing {i}") do_big_task(i) finish_up() Since this takes a long time, the user m...
I have created a directory named Temporary_add_to_version_control on Desktop. Now I am trying to reach that directory by typing the following in git-bash: cd ~/Desktop/Temporary_add_to_version_con...
Among other things, a URL consists of a host and a path: I was wondering (and couldn't find anything) if there's a name for the combination of host and path. Is there a name for these: examp...
From reading about the Crossfilter data manipulation library for JavaScript, I take it that "groups" are an important concept in its operation. However, the Crossfilter documentation does not ever...
I would like to use tf.timestamp() when it is available (eager mode and graph mode without XLA), and use 0. (or a better fallback if there is one) when it is not available (with XLA; @tf.function(j...
I'm trying to create an automatic text-to-link conversion feature in a TypeScript application. The desired workflow is: Copy a URL to the clipboard Select some text Paste the URL - this should...
When running various Python scripts, I often need to do this annoying dance: $ python script.py ... ModuleNotFoundError: No module named 'foo' $ pip install foo $ python script.py ... Module...
I want my CLI Python program to schedule a task, and then exit. After some times has passed (say 10 minutes) the task should execute. The task can be a Python method or a shell command, whatever i...
Looping in Ansible usually produces a neat output of one line per iteration (per host): ... ok: [Arch] => (item=something) ok: [Arch] => (item=something_else) ok: [Arch] => (item=yet_a...
I have been using open-source software, and the open-source Community is great at maintaining such projects. But I have observed something in smaller open-source projects. Whenever I demand some f...
I have created a tag in my project, using git tag v2023 However, I forgot to commit a few changes. Now I would like to move this tag to the current point (after having committed the changes I had...
I'm trying to revive an old project of mine. It was built with Phalcon PHP 2 or 3 (I don't even remember which version, but quite old). There I could include a call to the loop inside the controll...
This is meant as a FAQ Q&A regarding variable-length arrays (VLA). The two bugs described below are surprisingly common. I'm trying to use the variable-length arrays feature of C99 (and newe...
I am writing a Python package where I have two classes in different files that (indirectly) depend on each other. If I wouldn't care about type-hints, there would be no problem, but unfortunately,...
I want to write a text file from multiple threads. The file structure is line-oriented. This means writing of lines should be atomic. I am using Qt 5.15.2. Is it enough to protect a shared QTextSt...
My Android app needs to process lists that contain nullable elements. I am using JUnit 4.13.2 for unit testing. I am using Android Studio Flamingo | 2022.2.1 Patch 2 . I have a failing test,...
How do I clone the repository with only part of the history? For example, let's say I want to download only the last 5 commits out of thousands.
Is it possible for a Python program to send itself in the background? For example, on Linux you can do nohup some_cmd & and any program will run in the background. Some programs also support s...
I have git repo where the .git is deleted. I didn't realize it until after I made some changes to the code. I want to re-create the .git by cloning. However I don't want it to touch the files that...
TL;DR: How to pass a interpolated double vector, such as a dvec2, from the vertex shader to the fragment shader? I have a vertex shader. In this the output variable out vec2 uv; is set. And i have...
According to the standard (C17 draft, 7.22.3.2) The function calloc void *calloc(size_t nmemb, size_t size); "allocates space for an array of nmemb objects, each of whose size is size [and] i...
Consider this code: while(arr[index] != 0) index++; vs while(arr[index] != 0) { index++; } Personally, I prefer the first. The fact that the braces are not needed makes them -- u...
I have an application that works with a JTable, and in this JTable, I want each cell to have both an ImageIcon and some text. I see at this link, JTable supports ImageIcon OR text, but seemingly n...
On a live boot of Ubuntu 20.04, I was trying to clone into a private GitHub repository. I went through the hassle of installing git, and then gh, and making sure I was signed in through the termina...
I have a very simple source file -- HelloWorld.java public class HelloWorld { public static void main(String[] args) { System.out.println("hello world"); } } I have th...
I have the following xarray Dataset: d: <xarray.Dataset> Dimensions: (x: 79, y: 63, t: 1) Coordinates: * x (x) float64 0.9412 1.882 2.824 3.765 ... 71.53 72.47 73.41 74.35 * ...
I'm currently writing an input and output handling library for the D language, and I'm not getting any kind of input language change messages when the language is being toggled with hotkeys, and on...
In Python, multiprocessing is easy to do if you follow a "list projection" paradigm. Say you want to take a list of inputs X and apply some function f to every x_i, such that y_i = f(x_i) and the y...
Mathematically, the purpose of a function is to return an output. However, in a programming context functions often have side effects. It is even common to call functions for the side effects alone...
I have seen this construct quite a lot: int *p = (int*) malloc(n * sizeof(int)); Is this how it should be? What is the proper way to use malloc? I have also seen this: int *p = malloc(n * size...
Why does git merge take the source branch rather than the destination branch as a parameter? The most common merge case by far for me is "Okay, this branch looks good, let's merge it into branch X...
Suppose I have some variables like: >>> count = 8 >>> status = 'off' I want to combine them with some hard-coded text, to get a single string like 'I have 8 cans of Spam®; b...
When I have tried to read technical explanations of the syntax rules for programming languages, and when I am trying to decipher error messages, I often encounter the terms expression and statement...
I know that I can display a single string in the terminal window like print("example") (or similarly with a string in a variable), and I know how to open text files and write to them. I also know ...
What is the purpose of grouping the tests in a tests module like this #[cfg(test)] mod tests { use super::*; #[test] fn test_function_1() { // test code for function 1 g...
I'm looking at the behaviour of Chrome and my test framework and trying to understand what the correct behaviour should be before raising an issue/ticket on one or the other (or revisiting how my t...
Suppose I have two variables that are called animal and age, and print them as a string in the console like so: animal = "giraffe" age = 25 print("A %s can live up to %d years" %(animal,age)) ...
How to use static functions in ColdFusion? How to import component? How to call a static function using both tag and script syntaxes? Adobe added support for static functions in ColdFusion...
