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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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Spring Boot application not excluding Jdbi bean when running tests using WebFluxTest

I have a simple Spring Boot 3.x reactive application that exposes a RESTful API. The application uses Jdbi in the persistence layer, and the configuration for Jdbi is straightforward: @EnableTrans...

0 answers  ·  posted 2y ago by deleted user

java spring spring-boot jdbi
77%
+5 −0
How can I git checkout the previous HEAD?

After switching to a different branch, git checkout - can move me back to the branch I came from. This is handy for times when I wonder "wait, what was that last branch again?" But this does not w...

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

git
63%
+5 −2
Is git pull dangerous?

I heard git pull is dangerous. Is it really dangerous? If so, why or how is it dangerous? Are there any flags that mitigate or remove the danger? What are the alternatives if it...

2 answers  ·  posted 2y ago by alx‭  ·  last activity 2y ago by alx‭

git
50%
+0 −0
STM32: read data in device sent by host over USB HID

In an STM32CubeIDE USB HID project for an STM32F103C8 board I can send data from the device to the host using the USBD_HID_SendReport() function, like so: USBD_HID_SendReport(&hUsbDeviceFS, (u...

0 answers  ·  posted 2y ago by etale_cohomology‭

usb usb-hid stm32 libusb
66%
+2 −0
how can I run pytest on Flask routes?

I'm trying to implement pytest for one of my Python Flask projects. The application is instanciated like this in appname.py def create_app(): app = Flask(__name__) app.config.from_pyfil...

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

python flask pytest
77%
+5 −0
Reusing HTML without rewriting it

I have a site hosted through GitHub and I'm using footers for special links and it also serves as my main navigation bar for now. I find it a little frustrating to manually copy-paste the footer's ...

3 answers  ·  posted 2y ago by General Sebast1an‭  ·  last activity 2y ago by matthewsnyder‭

html
71%
+3 −0
What does Nixpkgs' callPackage do?

callPackage is a complex function (reasons include the Nix language being lazy, usage of fixed-point evaluation, overrides, etc.), and this complexity steals the spotlight from what this function a...

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

*nix nixpkgs
66%
+2 −0
How to execute and find gradients of a tensorflow (1) graph object

I have an "tensorflow.python.framework.ops.Graph" object loaded from a .pb file. def load_pb(path_to_pb): with tf.compat.v1.gfile.GFile(path_to_pb, "rb") as f: graph_def = tf.compat....

0 answers  ·  posted 2y ago by purplenanite‭

tensorflow tensorflow-graph-mode
71%
+3 −0
How to establish a relationship between HTML elements (tags)? (i.e., how can one element refer to another one)

Should I use the data-* attributes for this or is there a more idiomatic way? For context, I'm trying to convert annotated legal PDF documents to HTML. Certain parts of these documents are cross...

3 answers  ·  posted 2y ago by toraritte‭  ·  edited 2y ago by Karl Knechtel‭

html
66%
+2 −0
Is this AES/CBC scheme, where the IV does not need to be known during decryption, insecure or does it have any other disadvantages?

Usually a random IV is used for encryption with AES in CBC mode, so that key/IV pairs are not reused, which would be a vulnerability. During decryption, the IV of the encryption is required. If de...

1 answer  ·  posted 2y ago by Holden‭  ·  last activity 2y ago by Peter Taylor‭

encryption aes cbc-mode
60%
+1 −0
How can I create and modify a struct over iterations of a loop?

How can I have a mutable object (for example a vector) that is created inside a loop iteration and needs to be updated in later iterations of said loop? As a concrete example, consider parsing som...

2 answers  ·  posted 2y ago by GeraldS‭  ·  last activity 2y ago by GeraldS‭

rust loops mutability ownership
28%
+0 −3
libicuin75.dll was not found

At this time I am trying to manually install doxygen into msys64 but the computer I am using does not have access to the internet. When I try to start doxywizard.exe, I am receiving this error. ...

2 answers  ·  posted 2y ago by john1726‭  ·  last activity 2y ago by Nisha Jadon‭

doxygen msys
60%
+1 −0
Cannot use import statement outside a module when integrating Carbon Design System (Web Components) in Svelte

I'm working on a Svelte web application. The issue I'm having is when I'm trying to integrate the Carbon Web Components module. I installed the module using npm install --save @carbon/web-component...

0 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by Alexei‭

svelte sveltekit carbon-design-system web-components
75%
+4 −0
Why does tkinter (or turtle, or IDLE) seem to be missing or broken? Isn't it part of the standard library?

I had understood that Python is supposed to come "batteries included", and that the "batteries" specifically include: the tkinter standard library, a simple GUI framework a simple IDE cal...

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

python installation tkinter
81%
+7 −0
Git apply vs git am

What are the differences between git apply and git am commands? Both seem to be used for applying patches to repositories. When should one be used over the other?

1 answer  ·  posted 2y ago by Iizuki‭  ·  last activity 2y ago by Michael‭

git
91%
+19 −0
Are "strong passwords" at all meaningful?

Whenever registering to diverse sites on the net, you are often forced to enter a so called "strong password", which would ideally contain both upper case letters, lower case letters, digits, and s...

4 answers  ·  posted 2y ago by Lundin‭  ·  last activity 2y ago by Michael‭

security passwords brute-force
77%
+5 −0
Wikidata: How do I ask for the start date of a property in SPARQL?

I have a SPARQL query to Wikidata that returns the names and handles and parties of politicians for whom a Mastodon address is stored at Wikidata. Filtered by nationality and with an output of the ...

1 answer  ·  posted 2y ago by wasuko‭  ·  last activity 2y ago by Ordoviz‭

SPARQL wikidata
80%
+6 −0
Use cases for raising a 'NotImplementedError' in Python

What are some legitimate use cases for raising a NotImplementedError exception in Python? How can it help express a code author's intentions to aid code maintenance and/or further development of co...

3 answers  ·  posted 2y ago by pfabri‭  ·  last activity 2y ago by pfabri‭

python exception
75%
+4 −0
Managing a dependency for a C application

One of my applications has a dependency on a stb-library. Now I am publishing this application to Github. Should I: Include the header that was used during development with the code? Have an in...

2 answers  ·  posted 2y ago by Melkor-1‭  ·  edited 2y ago by matthewsnyder‭

c package
66%
+2 −0
Maven JPA integration: processor not found

My annotation processor "cannot be found" but everything ~looks okay. In Eclipse IDE, I created a new Maven project with the "quickstart-architype" resulting in a project with this structure: ___...

1 answer  ·  posted 2y ago by tylerbakeman‭  ·  edited 2y ago by Andreas‭

java xml jpa
66%
+2 −0
Run Spark code without Spark?

There's not always a Spark cluster on hand to test Spark code. Is there some simple program that you can install locally, which has the same behavior as Spark (can run normal Spark scripts) withou...

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

apache-spark
40%
+0 −1
How to get conditional running cumulative sum based on current row and previous rows?

How do I perform a running cumulative sum that is based on a condition involving the current row and previous rows? Given the following table: acc | value | threshold 3 | 1 | 1 1 | 2 ...

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

apache-spark pyspark
77%
+5 −0
Why does Pip display "error: externally-managed-environment", and what can I do about it?

My (non-Windows) operating system came with Python, but that Python didn't include Pip. I followed instructions to install Pip for the included Python, using my system's package manager. But now w...

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

python linux pip
71%
+3 −0
What's the difference between colorMode and uiMode?

In setting android:configChanges in AndroidManifest.xml, what is the difference between colorMode and uiMode? I hear uiMode is for changes between light/dark modes, which sounds exactly what colorM...

1 answer  ·  posted 2y ago by Ullallulloo‭  ·  last activity 2y ago by zmzaps‭

android
60%
+1 −0
When configuring load balancer access logs, what permission does the S3 bucket need?

When enabling access logging for an AWS load balancer, I get the following error: Access Denied for bucket: test-bucket-access-logs. Please check S3bucket permission test-bucket-access-logs is ...

1 answer  ·  posted 2y ago by philipp.classen‭  ·  edited 2y ago by Alexei‭

aws-s3 aws-elb
71%
+3 −0
Are these two function pointer declarations equivalent?

Say I have two functions: FILE* get_input(const char fname[static 1]); FILE* get_output(const char fname[static 1]); And I wish to declare a function pointer and assign it the result of some p...

1 answer  ·  posted 2y ago by Melkor-1‭  ·  edited 2y ago by Melkor-1‭

c c23 typeof
71%
+3 −0
How can I start my Python code, from the code itself?

I have already learned how to tell the Python interpreter to run my code, but the standard approach feels a little unsatisfactory. I want the user experience to be that my program starts with the a...

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

python startup
50%
+0 −0
ArgumentError: could not find a temporary directory

Hello, I am trying to build a docker image for contributing to the devdocs repository, however I am failing to get past the thor docs:download --all command. It fails with the below error: . is w...

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

ruby docker dev-container
72%
+6 −1
What's the fastest way to copy, preserving file attributes, on each platform?

I am looking copy files platform-dependently on Linux, Oracle Solaris, MacOS, BSDs, and Windows. I have found some system calls for each platform, namely sendfile(), copy_file_range(), fcopyfile()...

0 answers  ·  posted 2y ago by Melkor-1‭  ·  last activity 2y ago by Melkor-1‭

c linux unix solaris freebsd
71%
+3 −0
ffmpeg - concatenating identical audio-only files results in "non-montonic DTS" warning

I am trying to join some video files and have an issue. I have boiled down the problem to the following minimal working example. I create a 2-second mp4 with a silent audio stream: $ ffmpeg -f l...

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

ffmpeg
75%
+4 −0
What's the difference between include_directories and target_include_directories?

I have seen others allude to include_directories as disfavored: Having trouble adding include directories Summaries from CMake's documentation: target_include_directories include_directori...

1 answer  ·  posted 2y ago by nogjam‭  ·  last activity 2y ago by congusbongus‭

cmake
50%
+0 −0
Why can't I run freshly-installed Python from the command line on Windows?

I tried installing Python on an old computer running Windows 8[1]. I know for a fact that there was never any previous installation of Python on the machine. The installation appeared to be success...

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

python windows installation command-line-interface
71%
+3 −0
What happened, or is happening, to other parts of the standard library? Why are they going missing?

In Python 3.12, I noticed that some libraries seem to be missing or "deprecated": >>> import asynchat Traceback (most recent call last): File "<stdin>", line 1, in <module&gt...

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

python standard-library
50%
+0 −0
Why won't Matplotlib show me a plot?

I installed Matplotlib and tried a simple demo, but I got a warning message and no plot showed up: >>> import matplotlib.pyplot as plt >>> plt.plot([1,2,3],[4,5,6]) [<matplo...

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

python matplotlib
60%
+1 −0
Why does venv seem to be missing or broken? Isn't it part of the standard library?

I understand the benefits of virtual environments in general, and specifically I want to use a virtual environment so that I'll have access to Pip without exposing the system Python (i.e., included...

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

python installation python-venv
66%
+2 −0
Why does pip seem to be missing or broken? Isn't it part of the standard library?

I already know that the pip command might not correspond to the same Python that python runs. But in my case, it seems not to exist at all. I can't even run it as a Python module: $ python -m pip ...

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

python installation pip
77%
+5 −0
Reinstall old Python libraries after update

Recently, Python updated from 3.11 to 3.12 and now all my libraries are gone. Actually they're in the old 3.11 site-packages, but now that python points to 3.12 those are not active. Every time I r...

3 answers  ·  posted 2y ago by matthewsnyder‭  ·  last activity 2y ago by Karl Knechtel‭

python-3
66%
+2 −0
How can I access and use command-line arguments in Python?

In many other programming languages, the execution of code starts in a specifically named function (such as main) which is expected to have a specific signature, which allows that function to recei...

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

python startup command-line-interface
66%
+2 −0
Understanding the if __name__ == '__main__': idiom

I've seen many examples of Python scripts that include a line that says: if __name__ == '__main__': Sometimes the following block contains a bunch of code, but other times it just makes a singl...

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

python startup entry-point
60%
+1 −0
Installing packages for, and using them with, a specific Python installation

I have multiple installations of Python on my machine. I already know how to choose one to use to run for my code - and therefore, I could also solve the problem for third-party application code. ...

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

python pip
75%
+4 −0
Understanding Virtual Environments for Python

Several times now, I've seen advice in tutorials, setup/install instructions for Python-based projects, etc. to use a virtual environment to keep things organized and make it simpler to manage the ...

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

python runtime-environment python-venv
50%
+0 −0
How can I make a standalone executable from Python code?

I know that I can make Python code run starting from the script, but this still requires the user to have Python installed (and will still rely on configuring the system so that it can find Python ...

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

python build
81%
+7 −0
Where to place digit separators in C23?

C23 introduces the digit separator ' which can be placed anywhere inside an integer constant for the purpose of clarity and self-documenting code. These are otherwise ignored by the compiler when d...

2 answers  ·  posted 2y ago by Lundin‭  ·  last activity 2y ago by John C‭

c code-style c23 digit-separators
75%
+4 −0
Android Studio IDE refuses to find my device

I've installed Android Studio Jellyfish (snap) on an Ubuntu Fossa VM and was finally able to generate an apk for my project after struggling with Gradle, Java, plugins, etc. The device is detected...

1 answer  ·  posted 2y ago by JohnRando‭  ·  last activity 2y ago by FractionalRadix‭

android ubuntu usb
77%
+5 −0
How is this code "dividing" by a string?

I found a strange expression in some Python code: from library import HOME_DIRECTORY file = HOME_DIRECTORY / "file.json" It seems to be dividing a string by another string in order to do som...

3 answers  ·  posted 2y ago by Andrew Ray‭  ·  edited 2y ago by hkotsubo‭

python operator-overloading operators python-3
71%
+3 −0
How do I trim a sorted list in Python?

How do I trim a sorted list in Python, so that I only keep the elements greater than a certain value? For example, if I have this list: l = [1, 3, 5, 6, 7, 8] How can I efficiently get a list of...

3 answers  ·  posted 2y ago by congusbongus‭  ·  last activity 2y ago by mellen‭

python array search
66%
+2 −0
What does "parameterised type in the positive / negative position" mean in the context of invariant functors?

From PureScript's Data.Functor.Invariant documentation (emphasis mine): A type of functor that can be used to adapt the type of a wrapped function where the parameterised type occurs in both the...

1 answer  ·  posted 2y ago by toraritte‭  ·  last activity 2y ago by Derek Elkins‭

functional-programming purescript purely-functional
71%
+3 −0
Where does the name of the pure function in the Applicative type class come from?

At this point in my learning journey, I simply accepted that this function is called pure (both in Haskell and in PureScript), but it would have helped a lot if I had known the reasoning behind thi...

1 answer  ·  posted 2y ago by toraritte‭  ·  last activity 2y ago by Derek Elkins‭

functional-programming haskell purescript etymology
66%
+4 −1
Subfolders for package-less module imports

Is there some sane way to allow Python to import from subfolders in projects that don't have a package? I have many Python programs that I implemented as Python files inside a directory, without a...

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

python-3
66%
+2 −0
Docker push fails with message "denied: requested access to the resource is denied"

Recently I had to push a new Docker image to our GitLab registry. I have the Maintainer role on that project. I had created a new token and used it to log in to Docker. However, when trying ...

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

docker gitlab