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Programming Leftovers

Submitted by Roy Schestowitz on Friday 25th of October 2019 12:31:18 PM Filed under
Development
  • Qt 3D Synchronisation Revisited

    As mentioned in the previous article in this series, Qt 3D 5.14 is bringing a number of changes aimed at improving performance.

    Most people familiar with Qt 3D will know that the API is designed around the construction of a scene graph, creating a hierarchy of Entities, each of them having having any number of Components (the frame graph is similar). Entities and Components are only data. Behaviour, such as rendering or animating, is provided by a number of aspects.

    Since Qt 3D was designed to be a general simulation engine, different aspects will care about different things when accessing the scene graph. They will also need to store different state data for each object. On top of that, aspects do much of their work using jobs which are parallelised when possible using a thread pool. So, in order to keep data related to each aspect separate and to avoid locking when accessing shared resources, each aspect maintains, when appropriate, a backend object used to store the state data matching each frontend object.

    In this article, we examine how state is synchronised between frontend and backend and how that process was changed in 5.14 to improve performance and memory usage.

  • Python 2 support is going away soon: Make the move to Python 3

    Seeing this tweet from Guido van Rossum the other day prompted me to write this “OMG, Python 2 is going away SOON” article. You have definitely heard it before, but seriously, folks, the Python upstream community is ending support for Python 2 at the end of the year!

    Let’s stop saying “2020” because that sounds far away when, in fact, we are talking about January 1, 2020, which is two and half months from now. In this article, I’ll provide some quick links and basic information to help you make the move to Python 3.

  • PHP 7.4's FFI Support Is In Good Shape For Tapping C Functions / Structures From PHP

    One of the interesting features for PHP 7.4 that is due for release at the end of next month is the long-awaited FFI (Foreign Function Interface) support. PHP 7.4's FFI lets developers call functions / variables / data structures defined in the C programming language from native PHP code.

    FFI is one of the prominent new features to PHP 7.4 along with the preload feature, hardening the PHP FPM systemd service, TLS 1.3 for OpenSSL streams, and many other changes. The PHP 7.4 FFI approach is comparable to that of FFI implementations for other languages.

  • 14 Best Natural Language Processing Tools in the World Today

    Natural language processing (NLP) is a field of computer science, artificial intelligence, and computational linguistics concerned with the interactions between computers and human (natural) languages. It includes word and sentence tokenization, text classification and sentiment analysis, spelling correction, information extraction, parsing, meaning extraction, and question answering.

    In our formative years, we master the basics of spoken and written language. However, the vast majority of us do not progress past some basic processing rules when we learn how to handle text in our applications. Yet unstructured software comprises the majority of the data we see. NLP is the technology for dealing with our all-pervasive product: human language, as it appears in social media, emails, web pages, tweets, product descriptions, newspaper stories, and scientific articles, in thousands of languages and variants.

    Many challenges in NLP involve natural language understanding. In other words, computers learn how to determine meaning from human or natural language input, and others involve natural language generation.

    There are some excellent open source software to solve common problems in text processing like sentiment analysis, topic identification, automatic labeling of content, and more.

    To provide an insight into the quality of software that is available, we have compiled a list of 14 excellent open source NLP tools. Hopefully, there will be something of interest here for anyone who wants to use these tools to solve practical problems. Here’s our fine-tuned recommendations.

  • Remi Collet: PHP version 7.1.33, 7.2.24 and 7.3.11

    RPM of PHP version 7.3.11 are available in remi repository for Fedora 30-31 and in remi-php73 repository for Fedora 29 and Enterprise Linux ≥ 6 (RHEL, CentOS).

    RPM of PHP version 7.2.24 are available in remi repository for Fedora 29 and in remi-php72 repository for Enterprise Linux ≥ 6 (RHEL, CentOS).

    RPM of PHP version 7.1.33 are available in remi-php71 repository for Enterprise Linux (RHEL, CentOS).

  • Sending Emails in Python – Tutorial with Code Examples

    What do you need to send an email with Python? Some basic programming and web knowledge along with the elementary Python skills. We assume you’ve already had a web app built with this language and now you need to extend its functionality with notifications or other emails sending. This tutorial will guide you through the most essential steps of sending emails via an SMTP server.

  • 2019.3 EAP 6

    The variables view got some improvements to show better and organized information about variables. Now, while using the console, debugger, or the Jupyter Notebook variables tab, you will notice changes on the way data for a variable is represented such as: display of shape and improved visual representation for scientific arrays (pandas: DataFrames, Series; numpy: ndarray), display of length information for objects with __len__ attribute, removal of duplicated type information, ids are no longer showcased for dictionary keys and set elements, and protected attributes that now are grouped, collapsed and placed at the bottom of the list of values.

»

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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.

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