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Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.

Filters (None)
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+1 −1
How to resolve a "ValueError: dimension 't' already exists as a scalar variable" arising when I am using xarray.Dataset.assign_coords()?

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 * ...

1 answer  ·  posted 1y ago by Ivan Nepomnyashchikh‭  ·  last activity 1y ago by mr Tsjolder‭

python xarray
60%
+1 −0
Issues with receiving WM_INPUTLANGCHANGE etc. messages when language is chosen using hotkeys

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...

1 answer  ·  posted 1y ago by ZILtoid1991‭  ·  edited 1y ago by Karl Knechtel‭

windows d
75%
+4 −0
Readable syntax for executing many callables with useful side effects

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...

1 answer  ·  posted 1y ago by matthewsnyder‭  ·  last activity 1y ago by mr Tsjolder‭

functional-programming python-3 multiprocess
77%
+5 −0
Terms for types of functions with respect to side effects

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...

2 answers  ·  posted 1y ago by matthewsnyder‭  ·  last activity 1y ago by Lundin‭

terminology language-agnostic functional-programming computer-science
85%
+10 −0
How to properly use malloc?

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...

3 answers  ·  posted 3y ago by klutt‭  ·  last activity 1y ago by Lundin‭

c malloc dynamic-allocation
80%
+6 −0
Why is git merge from rather than to?

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...

4 answers  ·  posted 1y ago by matthewsnyder‭  ·  last activity 1y ago by hkotsubo‭

git git-merge branching-strategy
66%
+4 −1
How can I build a string from smaller pieces?

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...

2 answers  ·  posted 1y ago by Karl Knechtel‭  ·  last activity 1y ago by Karl Knechtel‭

python string-concatenation string-formatting
88%
+13 −0
What are statements and expressions?

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...

4 answers  ·  posted 1y ago by Karl Knechtel‭  ·  last activity 1y ago by Dirk Herrmann‭

terminology language-agnostic
71%
+3 −0
How can I output / display multiple values, with controlled spacing, without building a string?

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 ...

1 answer  ·  posted 1y ago by Karl Knechtel‭  ·  last activity 1y ago by Karl Knechtel‭

python format output
81%
+7 −0
What is the purpose of grouping the tests in a `tests` module and is it possible to split them?

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...

3 answers  ·  posted 2y ago by ShadowsRanger‭  ·  last activity 1y ago by Moshi‭

rust testing
66%
+2 −0
What does the w3c standard say about tabbing away from a disabled element?

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...

0 answers  ·  posted 1y ago by pureferret ‭  ·  edited 1y ago by Alexei‭

html standard w3c focus
61%
+6 −3
Why are commas not needed for modulo string formatting when printing?

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)) ...

3 answers  ·  posted 2y ago by Bennshinpoes‭  ·  edited 1y ago by Karl Knechtel‭

python format-string
60%
+1 −0
How to call static methods in ColdFusion?

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...

0 answers  ·  posted 1y ago by Vanity Slug ❤️‭

static coldfusion
71%
+3 −0
How to compress columns of dataframe by function

Problem How can I compress each column of a dataframe to the output of a function (i.e., mean), preserving columns? MWE import pandas as pd data = {"A": [1, 2, 3, 4], "B": [5, 6, 7, 8]} ...

2 answers  ·  posted 2y ago by mcp‭  ·  last activity 1y ago by mr Tsjolder‭

python pandas
77%
+5 −0
Programmatically import, edit and export DBC files

I am looking for a way to programmatically edit and save .dbc files that are meant for J1939 CAN communication. I have a few large files that need to be compared/edited. Being able to import, edit...

1 answer  ·  posted 2y ago by HinkyDinky‭  ·  last activity 1y ago by HinkyDinky‭

dbc can-bus
60%
+1 −0
How to solve the "ReferenceError: service is not defined"?

Temporary notice: this is part of an ongoing project of transferring and splitting my canonical from Stack Overflow on common errors in Google Apps Script. As soon as the Q&As are finalized, ...

1 answer  ·  posted 1y ago by Oleg Valter‭  ·  last activity 1y ago by Oleg Valter‭

google-apps-script
71%
+3 −0
How do I serialize a const generic length array with Serde?

I have the following code: use serde::{Deserialize, Serialize}; #[derive(Sereialize, Deserialize)] struct Container<const SIZE: usize> { contents: [String; SIZE] } But I'm getti...

0 answers  ·  posted 1y ago by mousetail‭

rust serde
66%
+2 −0
VS Code can't find node installation due to dynamically setting the PATH

I installed Node.js using NVS to manage my node installations. This works great, except that I haven't been able to figure out how to debug using VS Code. When trying to launch, I receive this err...

0 answers  ·  posted 1y ago by Moshi‭

configuration vs-code
75%
+4 −0
How do I pull new changes in git submodules?

I have a git repository with some submodules. When the submodule repos get new commits on the remote, how can I pull them all?

0 answers  ·  posted 1y ago by matthewsnyder‭

git git-submodule
71%
+3 −0
How to solve the "Cannot call from this context" error?

Temporary notice: this is part of an ongoing project of transferring and splitting my canonical from Stack Overflow on common errors in Google Apps Script. As soon as the Q&As are finalized, ...

1 answer  ·  posted 1y ago by Oleg Valter‭  ·  last activity 1y ago by Oleg Valter‭

google-apps-script
71%
+3 −0
How to resolve the mypy error "Returning Any from function declared to return 'Dict[str, Any]'" in Python?

I have a function that loads JSON data and is declared to return a dictionary with string keys and values of any type (Dict[str, Any]). However, mypy is raising an error stating that I am returning...

1 answer  ·  posted 2y ago by ShadowsRanger‭  ·  last activity 1y ago by Moshi‭

python mypy
66%
+2 −0
Does Snowflake NATURAL JOIN support outer-style join?

I like using NATURAL JOIN in Snowflake, because I find it more elegant than explicit join clauses. However, it appears that the natural join behaves similar to an inner join, in that null values o...

1 answer  ·  posted 2y ago by matthewsnyder‭  ·  edited 2y ago by matthewsnyder‭

sql join snowflake
66%
+2 −0
"Move symbol" refactor for Python in Visual Studio Codium

Is there a way to add support for "move symbol" in Python code for VS Codium? PyCharm can do this, but I am looking for a VSC solution. PyLance can do this, but PyLance itself is closed source, a...

0 answers  ·  posted 2y ago by matthewsnyder‭  ·  edited 2y ago by matthewsnyder‭

python vs-code refactoring
33%
+2 −6
How do I use an existing AI model to classify pornographic images? [closed]

In the last few months, AI has advanced considerably, notably in the area of generating images. We now have powerful models like DALL-E, Stable Diffusion, etc. These are quite competent at generati...

0 answers  ·  posted 2y ago by matthewsnyder‭  ·  closed 2y ago by Alexei‭

openai python-3 artificial-intelligence image-classification system-design
50%
+2 −2
Slicing a dictionary using a string variable

I am working on adding uncertainty to some of my dynamics within a larger Monte Carlo simulation. As a way to perform multiple operations on each value, I decided to make and use a new function to ...

1 answer  ·  posted 2y ago by megalomaniac‭  ·  edited 2y ago by megalomaniac‭

python
66%
+2 −0
Log4j2 not looking for log4j.properties even with the system property set

I am migrating an application from Log4j1 to Log4j2 using the API bridge jar. All references to the log4j1.jar have already been removed. I set the system property in Websphere as a JVM argument -...

1 answer  ·  posted 2y ago by tarhalda‭  ·  edited 2y ago by Alexei‭

java log4j
66%
+2 −0
Redux Toolkit Issue with Managing States

I am all new with using Redux Toolkit, I followed the official documentation to setup the store: // store.ts import { configureStore, ThunkAction, Action, combineReducers } from '@reduxjs/toolkit...

0 answers  ·  posted 2y ago by boudagga.ma94‭

reactjs react-redux redux-toolkit
60%
+1 −0
What can be used in react-native instead of an html label tag to achieve the same result?

I wanna make a form in React native. A field in this form in (non-native) React would be like this: <div> <label htmlFor="lastName">Last Name:</label> <input type="text...

0 answers  ·  posted 2y ago by andre‭  ·  edited 2y ago by andre‭

reactjs react-native
80%
+6 −0
How to use function composition for applying a function to first elements of a list?

Can anyone explain to me why my Haskell function gives rise to a type-definition error? Originally, I wrote the following function to subtract one from the first n elements in a list: dec_first :...

2 answers  ·  posted 2y ago by mr Tsjolder‭  ·  last activity 2y ago by mauke‭

standard-library haskell
42%
+1 −2
Program freezing in `post_comments_to_lemmy` function due to potential infinite loop

I'm experiencing an issue where my program appears to freeze when executing the post_comments_to_lemmy function. This function fetches comments from the GitHub API and posts them to a Lemmy instanc...

1 answer  ·  posted 2y ago by ShadowsRanger‭  ·  last activity 2y ago by __blackjack__‭

python
81%
+7 −0
How do I add functionality to the back button?

How do I add functionality to the back button in Android without reimplementing the back button entirely? Prior to last year, I would just call onBackPressed() and then simply override it: overri...

1 answer  ·  posted 2y ago by Ullallulloo‭  ·  edited 2y ago by Ullallulloo‭

android
77%
+5 −0
Lemmy API: how to get list of followed/subscribed communities.

Context Using the lemmy API, I'm trying to get a list of sublemmies (lemmy communities) that a user is following. Reading the documentation, I using the /site endpoint, I should be able to get a ...

1 answer  ·  posted 2y ago by elvis_depresley‭  ·  last activity 2y ago by tgxn‭

rest lemmy curl
83%
+8 −0
What are disadvantages of static functions (ie functions with internal linkage) in C?

Functions in C have external linkage by default. In other words, the storage class specifier extern is applied to functions by default, with the effect that they are visible to all translation unit...

3 answers  ·  posted 2y ago by Lover of Structure‭  ·  last activity 2y ago by Dirk Herrmann‭

c linkage
66%
+2 −0
Can I package a database other than SQLite with a Flutter app?

Flutter supports packaging a SQLite instance with a Flutter app using the Sqflite plugin. I do not like the speed of SQLite or the fact that it does not enforce column datatypes and want to use som...

0 answers  ·  posted 2y ago by tarhalda‭  ·  edited 2y ago by tarhalda‭

flutter database
20%
+0 −6
how to use one list to find a similar list in another list python

I want a way to make it so that I can use list B to find out if a copy of itself exists in list A. listA = ['1', '1', '0', '1', '0', '1', 'down'] 2 ['0', '0', '1', '1', '1', '1', 'up'] 2 ['1', '...

1 answer  ·  posted 2y ago by Solaranfel1366‭  ·  last activity 2y ago by Alias Cartellano‭

python list
40%
+2 −4
constructor in C

#include<stdio.h> struct Book { char title[20]; char author[20]; int pages; }; void init_Book_types(struct Book* aTitle,struct Book* aAuthor,struct Book* aPages){ aTitle->ti...

2 answers  ·  posted 4y ago by deleted user  ·  last activity 2y ago by __blackjack__‭

c constructor
57%
+2 −1
Can pandas be used as a database backend for persistent storage?

Question What is the current state of the art database app? How does it compare to SQL? Can pandas be used in place of either? If not, is there something that bridges the gap between SQL and pand...

2 answers  ·  posted 2y ago by mcp‭  ·  last activity 2y ago by matthewsnyder‭

python database pandas
63%
+5 −2
Prevent vscode from inserting new lines in the middle of my code on format.

I am cleaning up java code in vscode to make it more readable. When I format my document there are instances when vscode inserts new line character when I don't want it. Here I show 2 examples of w...

1 answer  ·  posted 2y ago by Vanity Slug ❤️‭  ·  edited 2y ago by Vanity Slug ❤️‭

format vs-code
80%
+6 −0
How do I find disjoint sets in a dataset

I have a dataset of car bookings like this: car_id user_id 1 1 2 1 1 2 3 3 1 2 3 3 In this dataset, two separate groups/sets of cars and users...

2 answers  ·  posted 2y ago by andreas‭  ·  edited 2y ago by matthewsnyder‭

algorithms julia python-3
80%
+6 −0
When using the compare function in Array.prototype.sort, how to avoid an element to be processed more than once?

When using the Array.prototype.sort method, we can pass a compare function as argument. Then, this function can be used to process array's elements, so the comparison is made using some custom crit...

2 answers  ·  posted 3y ago by hkotsubo‭  ·  last activity 2y ago by matthewsnyder‭

javascript array sorting
84%
+9 −0
Are there references in C?

When reading posts at programming sites such as this one, I frequently encounter people saying things like: "There is no pass-by-reference in C, everything is passed by value." People claiming su...

3 answers  ·  posted 3y ago by Lundin‭  ·  last activity 2y ago by Alexei‭

c pointers pass-by-reference reference
71%
+3 −0
Problems with Google Apps Script API JavaScript "How to... Execute function"

As this is the first question about Google Apps Script, here is a very brief description: it is a platform that helps people easily get programmatic access to Google apps data like Gmail messages, ...

1 answer  ·  posted 2y ago by Wicket‭  ·  last activity 2y ago by Wicket‭

javascript google-apps-script google-cloud-platform
77%
+5 −0
Possible drawbacks for having duplicate local sources of the project tracking the same Git remote

Context I have started working on an Angular upgrade for a medium-sized project (from v. 10 to v. 15) and this is a rather long activity that is interrupted by other changes that need to be perfor...

2 answers  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Andrew‭

git angular upgrade npm
50%
+0 −0
How to move Rancher Desktop virtual disk file to another location?

I am using Rancher Desktop as an alternative to Docker Desktop. After using docker for a while I have noticed that C:\Users\user\AppData\Local\Docker\wsl\data\ext4.vhdx has grown quite a bit (20GB+...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Alexei‭

rancher-desktop wsl wsl-2
77%
+5 −0
How to configure Python pip to look for packages in a private index first?

When I run pip install foo, pip looks for foo in PyPi. I want it to look for it first in a private repo, let's say pypi.bar.com. Only if foo cannot be found in pypi.bar.com, should pip then look f...

1 answer  ·  posted 2y ago by matthewsnyder‭  ·  last activity 2y ago by tripleee‭

python-3 pip
71%
+3 −0
Running mvn validate does not show rules passed message though it should

My large, multi-module Maven project validation (Maven Enforcer plug-in) is playing tricks on me. moduleA> mvn validate correctly finds all modules runs enforcer on all of them displays co...

0 answers  ·  posted 2y ago by LAFK‭

maven maven-enforcer-plugin
75%
+4 −0
How to make Husky run git hook?

How to make Husky run git hook? I have a working git hook, prepare-commit-message, but the moment Husky was installed, the hook stopped working. Not finding much luck, I then tried to make it a "H...

1 answer  ·  posted 2y ago by LAFK‭  ·  edited 2y ago by Alexei‭

git husky git-hook
87%
+12 −0
For scripting what are the pros and cons of command line arguments versus capturing input at the start?

Let's say I have a script that needs the user to set X number of variables at the start. One can either Pass the arguments in on the command line. Start the program and then have the user input...

6 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 2y ago by Dirk Herrmann‭

software-practices command-line-interface
71%
+3 −0
Load site based on cookie value in PHP

I need to load a site based on a cookie. I wrote code to validate that, like this. if(!isset($_COOKIE['cookie'])){ $domain = $_SERVER['SERVER_NAME']; setcookie('cookie', $cookie, time() ...

1 answer  ·  posted 3y ago by hajakutbudeen‭  ·  last activity 2y ago by keyang‭

php cookies http-headers reload
50%
+1 −1
Count the number of occurrences in a text string

If I have some text in a cell, how can I find the number of times another piece of text appears in it? For example, suppose A1 contains Peter Piper picked a peck of pickled peppers.. pick occurs 2...

2 answers  ·  posted 4y ago by pnuts‭  ·  last activity 2y ago by Dirk Herrmann‭

excel string libreoffice-calc google-sheets openoffice-calc