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Programming Leftovers

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Development
  • New unit tests for the new code

    today I want to present the test system for Cantor's worksheet.
    The worksheet is the most central, prominent and important part of the application where the most work is done.

    So, it is important to cover this part with enough tests to ensure the quality and stability of this component in future.

    At the moment, this system contains only ten tests and all of them cover the functionality for the import of Jupyter notebooks only that was added recently to Cantor (I have mentioned them in my first post).
    However, this test infrastructure is of generic nature and can easily be used for testing Cantor's own Cantor files, too.

  • AiC: Unbounded queues and lang design

    I have been thinking about how language feature development works in Rust. I wanted to write a post about what I see as one of the key problems: too much concurrency in our design process, without any kind of “back-pressure” to help keep the number of “open efforts” under control. This setup does enable us to get a lot of things done sometimes, but I believe it also leads to a number of problems.

    Although I don’t make any proposals in this post, I am basically advocating for changes to our process that can help us to stay focused on a few active things at a time. Basically, incorporating a notion of capacity such that, if we want to start something new, we either have to finish up with something or else find a way to grow our capacity.

  • Caktus Consulting Group: Book Review: Creating GUI Applications with wxPython

    I enjoyed working through the book Creating GUI Applications with wxPython by Michael Driscoll, learning various techniques for programming GUI applications in Python using wxPython.

    This book is not intended to be a beginners' tutorial. The first chapter is titled "An Intro to wxPython," but it's very basic. I think anyone with a few simple wxPython apps under their belt would have no trouble with this book, but as a complete beginner to wxPython, I struggled a bit. Again, the book is not intended for complete beginners, so that's my fault.

  • Python/matplotlib : Plotting an arc in 3D plot

    I'm trying to draw an arc that is tangent to Z axis, as shown in the figure below, using matplotlib.

    In this arc one end point O is fixed to the origin of a right-handed Euclidean space, which is tangent to Z axis and other end point P at any location in the space.

    C is the center of the arc in the x-y plane, θ is the angle between O and P on x-y plane, as shown in the next figure.

  • Build a Recommendation Engine With Collaborative Filtering

    Collaborative Filtering is the most common technique used when it comes to building intelligent recommender systems that can learn to give better recommendations as more information about users is collected.

    Most websites like Amazon, YouTube, and Netflix use collaborative filtering as a part of their sophisticated recommendation systems. You can use this technique to build recommenders that give suggestions to a user on the basis of the likes and dislikes of similar users.

  • Python's Bokeh Library for Interactive Data Visualization
  • Creating custom user model and custom authentication in Django
  • How to create management commands in Django
  • How to send email from Python and Django using Office 365 [Ed: Today in Planet Python: How to make Python a part of Microsoft and its mass surveillance operations

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.