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Q&A

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

22%
+0 −5
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', '...

0 answers  ·  posted 5mo ago by Solaranfel1366‭  ·  edited 5mo ago by Alexei‭

66%
+4 −1
How to provide additional information when raising exception

MWE filename = "bad_dir" print(f"File not found: {filename}.") raise(FileNotFoundError) Question How do I raise an exception while adding additional information? In the example above, the...

1 answer  ·  posted 5mo ago by young_souvlaki‭  ·  last activity 5mo ago by Alexei‭

60%
+1 −0
Datagrid in MVVM saves edits but not inserts

I am writing a todolist application in WPF with MVVM. I display the goals in a datagrid and the editing works fine. Changes made in the grid are saved to the DB when I click save. However, adding a...

1 answer  ·  posted 5mo ago by FrankLuke‭  ·  last activity 5mo ago by Alexei‭

77%
+5 −0
Any testimonials for any C++ units of measure library?

The question is about libraries that extend the data type system to ensure physically realistic computations. Think std::chrono but for distance and mass and other things as well as for time. Inste...

1 answer  ·  posted 6mo ago by Fred Wamsley‭  ·  last activity 5mo ago by Ben‭

50%
+0 −0
How to define Polly policies when working with Refit library in ASP.NET Core?

Note: this is based on my question on SO and subsequent activity there I am trying to add resilience using Polly to HTTP calls that are performed using Refit library. I am using the Refit factory...

1 answer  ·  posted 5mo ago by Alexei‭  ·  last activity 5mo ago by Alexei‭

33%
+0 −2
App crashes/ implementing picture in picture mode to timer

When I tried to emulate the app that I coded in the connected phone, it keeps closing due to crashes, is there any problem with my code? Also, I am trying to make a timer app with picture and pict...

0 answers  ·  posted 5mo ago by dkdkjoi‭  ·  edited 5mo ago by Alexei‭

25%
+0 −4
how do i fix this code [closed]

this is my build.gradle.app file: plugins { id 'com.android.application' } android { compileNdk flutter.compileNdkVersion compileOptions{ sourceCompatibility Ja...

0 answers  ·  posted 5mo ago by LSHpqr‭  ·  closed 5mo ago by Alexei‭

60%
+1 −0
How to refer to the same class twice from one Entity Framework entity?

I have two classes, Contestant and Picture, with the following setup: public class Contestant { ... public int AvatarID { get; set; } [ForeignKey(nameof(AvatarID))] public ...

1 answer  ·  posted 5mo ago by FrankLuke‭  ·  edited 5mo ago by Alexei‭

66%
+2 −0
Using Lua's `os.rename` to rename a file from a hard drive to a new location on a USB flash drive

I'm using the os.rename function in a lua script. It works perfectly fine for renaming files on my hard drive, e.g. os.rename("test.txt","/Users/username/Desktop/test2.txt") will rename the fil...

1 answer  ·  posted 6mo ago by samcarter‭  ·  last activity 6mo ago by Peter Taylor‭

42%
+1 −2
How to generate random objects at different locations on x, y, z axis

I have been trying to generate a random object on all three axis in different locations. However, Vector3 doesn't accept that many overloads e.g: Vector3 spawnPos = new Vector3(Random.Range(spawnL...

1 answer  ·  posted 6mo ago by simonJN‭  ·  last activity 6mo ago by InfiniteDissent‭

66%
+2 −0
How do I (compactly) initialize a 2-d array of structs with the same value?

I learned about the ** operator for array-repeat, and I love it. I have a struct that contains a 2-d array of inner structs, like const D1 = 30; const D2 = 40; const Inner = struct { .a: u32, ....

0 answers  ·  posted 6mo ago by aghast‭

70%
+5 −1
C naming convention, module trigrams?

For my company, I'm writing naming conventions for embedded code in C language. Function names must be named in lowerCamelCase() and start with a verb. Global variables are in Maj_started_lowe...

3 answers  ·  posted 6mo ago by AdriZ‭  ·  last activity 6mo ago by Dirk Herrmann‭

77%
+5 −0
Child div doesn't inherit parent's div background-color

I have a parent div with two child divs. I want the parent div and the child divs to have a blue background color when it's hovered. But the child divs doesn't inherit the background color. It is o...

1 answer  ·  posted 6mo ago by Bennshinpoes‭  ·  last activity 6mo ago by r~~‭

40%
+0 −1
white screen issues but not in USB tethering mode

I am getting a white screen issue for my angular portal, only if I am not using "USB tethering". When I use home/office wifi, and mobile hotspot, I get a white screen when I use USB tethering fro...

0 answers  ·  posted 6mo ago by SmartestVEGA‭  ·  edited 6mo ago by Ethan‭

50%
+0 −0
org.apache.http.NoHttpResponseException: nginx.apps.cloud.cloud.local:443 failed to respond

Getting the following error only when I call a post API through Nginx [0m[31m12:48:35,903 ERROR [io.acurio.hub.api.rest.impl.DesignsResource] (default task-16) Failed to invoke workflow: com.masha...

0 answers  ·  posted 6mo ago by SmartestVEGA‭

71%
+3 −0
Cast uninitialized variable to (void)

Is it undefined behaviour to cast an uninitialized variable to (void)? Example: int main() { int x; (void)x; return 0; }

4 answers  ·  posted 7mo ago by Estela‭  ·  last activity 6mo ago by Ethan‭

57%
+2 −1
Jenkins failed to delete a file - why? How to prevent?

We are using Jenkins to run our system tests on a regular schedule. The Jenkins job downloads some python scripts from Perforce, runs them and compares the outputs with known-good results. The pro...

2 answers  ·  posted 2y ago by anatolyg‭  ·  last activity 6mo ago by anatolyg‭

92%
+21 −0
What is HEAD in Git?

In Git documentation, there are lots of references to the term "HEAD". But what exactly is it? Some places refer to it as "a pointer to the current branch". So it's a branch? What is it used for?

1 answer  ·  posted 1y ago by hkotsubo‭  ·  last activity 6mo ago by hkotsubo‭

66%
+2 −0
Input date in Angular Material date picker in dd/MM/yyyyy format

I am trying to create an application that takes a date as user input which is then passed as a parameter to an API call. The local date format is dd/MM/yyyy. I want the user to be able to enter t...

1 answer  ·  posted 7mo ago by mcalex‭  ·  last activity 6mo ago by tmpod‭

57%
+2 −1
ffmpeg: apply a filter from a start time to the end of the video

I'm using ffmpeg to apply a filter in between two time points. I am using the between() operator to specify the times. For example, to apply the yadif filter between 30 and 90 seconds I run: ffmpe...

1 answer  ·  posted 7mo ago by Trevor‭  ·  last activity 7mo ago by Trevor‭

44%
+2 −3
When I use the piecewise function I get more columns in the output

I have this code syms t y(t) = t*heaviside(t)*heaviside(1-t); x(t) = piecewise(0&lt;=t&lt;=1,1,t&lt;0,0,t&gt;1,0); l = -2:0.01:2; disp(y(l)); disp(x(l)); and in the output, I ge...

0 answers  ·  posted 7mo ago by MissMulan‭  ·  edited 7mo ago by Alexei‭

57%
+2 −1
What should I read if I knew C++ twenty years ago? [closed]

For someone who was familiar with C++ in the past and is coming back to it after a long break, what are some useful books that won't waste time with basics but will cover the new features of the mo...

0 answers  ·  posted 7mo ago by Fred Wamsley‭  ·  edited 7mo ago by Alexei‭

c++
81%
+7 −0
Is there any benefit to using new?

I've heard that in modern C++, smart pointers are preferred to raw pointers for ownership (the so-called RAII principle, as I understand it). This makes sense, and since then I've always used them...

1 answer  ·  posted 7mo ago by Moshi‭  ·  last activity 7mo ago by InfiniteDissent‭

45%
+3 −4
Create a list of Niven numbers in Python

There's this new challenge on Code Golf CD and I'm using Python to do it. A little bit of golfing already took place, so the code might look a bit messy for you. Anyway, I'm proud of what I've writ...

2 answers  ·  posted 7mo ago by General Sebast1an‭  ·  last activity 7mo ago by Dirk Herrmann‭

85%
+10 −0
How to do private encapsulation in C?

I'm using an object-oriented design for my C project and trying to implement classes with private encapsulation. How do I do this? Some things I've tried that are problematic: Using a struct f...

1 answer  ·  posted 1y ago by Lundin‭  ·  last activity 7mo ago by Lundin‭

66%
+2 −0
Can UWPNuGetPackages be moved to another drive?

I'm trying to make a UWP app in Visual studio, but the NuGet package files have been huge. They just don't fit on my SSD, but I do have an HDD I could theoretically use. After a bunch of tinkering...

1 answer  ·  posted 7mo ago by Ullallulloo‭  ·  last activity 7mo ago by Ullallulloo‭

71%
+3 −0
Why is boolean value f (false) defined as a parsing-word while t (true) is not in Factor?

I noticed when attempting to generate random booleans that t and f are not treated in the same way: t random ! Error f random ! returns a value In the factor 0.98 and 0.99 documentation, t is ...

1 answer  ·  posted 7mo ago by Razetime‭  ·  edited 7mo ago by Alexei‭

60%
+1 −0
How to get a default value from an assoc in Factor programming language

To get a value from an assoc and provide a default value if the value does not exist, I am using the following definition: :: at-def ( key assoc default -- value ) key assoc ?at [ drop default ] w...

1 answer  ·  posted 7mo ago by Razetime‭  ·  last activity 7mo ago by erg‭

66%
+2 −0
How to create a quotation containing the given token in a syntax word in Factor programming language

I am trying to define a syntax word as follows: USING: kernel syntax parser fry prettyprint ; IN: syn-try SYNTAX: syn scan-word '[ _ ] . ; Given a word, I want to create a quotation conta...

2 answers  ·  posted 7mo ago by Razetime‭  ·  edited 7mo ago by Alexei‭

85%
+10 −0
How to manage user-specific application data on Linux?

I am developing an application that targets Linux-based OS, and I need to store the user's configuration, metadata and other things in a persistent way (i.e. on the file system). I know that one c...

3 answers  ·  posted 7mo ago by Björn‭  ·  last activity 7mo ago by celtschk‭

66%
+2 −0
How to plot table from pandas dataframe

MWE import pandas as pd import numpy as np import matplotlib.pyplot as plt df = pd.DataFrame(np.random.rand(9, 4), columns=['a', 'b', 'c', 'd']) df.plot.bar(table=True) # don't want plot, ...

1 answer  ·  posted 8mo ago by young_souvlaki‭  ·  last activity 7mo ago by __blackjack__‭

75%
+4 −0
Keep local branch changes to resolve all remaining conflicts in a merge

On branch-x, I do git merge branch-y Now there are some conflicts, and git status shows Changes to be committed: new file: a new file: b Unmerged paths: (use "git a...

1 answer  ·  posted 8mo ago by Quasímodo‭  ·  last activity 8mo ago by Quasímodo‭

77%
+5 −0
What is the Python Global Interpreter Lock?

What exactly is the Python Global Interpreter Lock (GIL)? As someone who is relatively new to Python, is this something I need to be aware of, or is this just some implementation detail of the inte...

1 answer  ·  posted 8mo ago by Moshi‭  ·  last activity 8mo ago by Derek Elkins‭

71%
+3 −0
How to correctly daemonize a Rocket-based app?

Summary I'm refactoring a Rust-based service/daemon to move away from gRPC and use a Rocket-based API instead. I'm also using the daemonize crate to turn the foreground process into a background p...

1 answer  ·  posted 9mo ago by ghost-in-the-zsh‭  ·  last activity 8mo ago by ghost-in-the-zsh‭

71%
+3 −0
How to add vertical lines for visual separation in pandas plot

MWE import pandas as pd import numpy as np import matplotlib.pyplot as plt df = pd.DataFrame(np.random.rand(9, 4), columns=['a', 'b', 'c', 'd']) df.plot.bar() plt.show() Question Ho...

2 answers  ·  posted 8mo ago by young_souvlaki‭  ·  last activity 8mo ago by samcarter‭

80%
+6 −0
How to use grep to print only specific word from a string

I have a variable that contains a string: $CCSR = "branches/features/arm_and_musl" I want to get only the part after the last /. In this case it's "arm_and_musl" but it can be anything. So som...

3 answers  ·  posted 8mo ago by Megan‭  ·  edited 8mo ago by hkotsubo‭

33%
+0 −2
Need help in migrating a Python2 custom middleware to current Python3 version

class ExtendUserSession(MiddlewareMixin): """ Extend authenticated user's sessions so they don't have to log back in following 15 minutes (set by Django's default `SESSION_COOKIE_A...

0 answers  ·  posted 9mo ago by roronoa_zoroDR‭  ·  last activity 8mo ago by Monica Cellio‭

71%
+3 −0
Do you need to use std::move to store a parameter passed by value?

If you have a class which needs to store a construction parameter internally, and you want to take advantage of move semantics, I understand that the parameter should be passed by value: class Foo...

1 answer  ·  posted 8mo ago by InfiniteDissent‭  ·  last activity 8mo ago by Dirk Herrmann‭

75%
+4 −0
How to configure .gitignore to ignore all files except a certain directory

MWE In the terminal run: mkdir mwe cd mwe mkdir dir touch f1.txt f2.pdf dir/f1.txt dir/f2.pdf git init . Create a .gitignore with: * # ignore all !dir/ # except this directory ...

1 answer  ·  posted 8mo ago by young_souvlaki‭  ·  last activity 8mo ago by Moshi‭

50%
+0 −0
Working with a generic class that uses a type that should be of generic type

I have followed Nick Chapsas' tutorial to avoid throwing a ValidationException to treat validation errors and instead rely on LanguageExt.Common.Result&lt;&gt; from LanguageExt library. I have ma...

0 answers  ·  posted 8mo ago by Alexei‭

23%
+1 −8
How to efficiently remove every occurrence of one string inside another

I have two strings and want to remove every occurrence of the second string inside the first one starting from the beginning of the first string and as if each occurrence was removed immediately. ...

1 answer  ·  posted 1y ago by dumplings‭  ·  edited 8mo ago by __blackjack__‭

50%
+0 −0
How to migrate NLog configuration from XML file(s) to application settings (JSON)?

I have just created an ASP.NET Core 6 application and added NLog support for logging: NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger() However, this API is almost deprecated as ...

1 answer  ·  posted 8mo ago by Alexei‭  ·  last activity 8mo ago by Alexei‭

60%
+1 −0
How to generate lots of hyperlinks rather fast using ClosedXML library?

I am using ClosedXML library to generate an Excel containing thousands of hyperlinks using cell's Hyperlink property: cell.SetValue(text).Hyperlink = new XLHyperlink(url); Such a call takes abo...

1 answer  ·  posted 9mo ago by Alexei‭  ·  last activity 9mo ago by Alexei‭

81%
+7 −0
What allows a string slice (&str) to outlive its scope?

As a relative newcomer to Rust, I'm trying to understand the behaviour of lifetimes, but I am confused by the following code: let s: &amp;str = "first"; let mut r: &amp;str = s; println!("First ...

2 answers  ·  posted 9mo ago by InfiniteDissent‭  ·  last activity 9mo ago by Moshi‭

60%
+1 −0
VBScript Listener in SSRS

Is it possible to add listeners via VBScript/ JS directly into a SRSS report? Goal: Track changes of input fields and key press inside the wrapper React based on the events Directly in the...

0 answers  ·  posted 9mo ago by Yolanda‭  ·  edited 9mo ago by Alexei‭

71%
+3 −0
Assert that some code is not present in the final binary, at compile or link time.

I'd like to assert that some code can be optimized out, and is not present in the final binary object. #define CONSTANT 0 #if (!CONSTANT) [[landmine_A]] #endif static int foo(void); void...

1 answer  ·  posted 9mo ago by alx‭  ·  last activity 9mo ago by alx‭

33%
+2 −6
Regarding the implementation of data structures.

I'm attempting a question to do with data structures, file streams &amp; linked lists. The code isn't complete yet as I am still halfway working on it. I am required to use data structures in the d...

1 answer  ·  posted 1y ago by dumplings‭  ·  edited 9mo ago by Alexei‭

33%
+1 −4
How can I modify the code above to accept string as user input and use strcmp to compare with the contents of the text file & then delete that line?

I want to enter a string to compare with the text file, and if that word matches, then I want to delete that line containing that string. How can I modify the code below, since the code below take...

1 answer  ·  posted 1y ago by dumplings‭  ·  edited 9mo ago by Alexei‭

40%
+2 −4
Problems with data structures and filestreams.

So I just started learning how to use file-streams in C &amp; decided to attempt a question which is to do with library management in C, however I am currently encountering some problems and feel l...

2 answers  ·  posted 1y ago by dumplings‭  ·  edited 9mo ago by Alexei‭

55%
+3 −2
Why does fopen return NULL?

#include&lt;stdio.h&gt; #include&lt;stdlib.h&gt; int main (void){ FILE *cfPtr; char name[15]; int ID; if ((cfPtr = fopen("draft.txt","w")) == NULL){ printf("File could n...

2 answers  ·  posted 1y ago by dumplings‭  ·  edited 9mo ago by dumplings‭