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Programming Leftovers

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Development
  • Python Community Interview With Brian Okken

    This week, it’s my pleasure to interview Brian Okken. Brian is perhaps best known as the author of Python Testing with pytest, as well as being the host of two podcasts. Read on to find out more about the man behind the voice, his new meetup in Portland, and the advice he has for anyone new to testing software.

  • Creating Dashboard to Visualise Data In Python

    During one of my university project modules which require us to present our data from the sample dataset of the Scottish Referendum 2014.

    There I was exposed to terms like Data Wrangling and the use of D3 to create an interactive dashboard.

    Which the process to do data-wrangling was a tedious process and creating the dashboard using D3 was quite bad as well.

  • How to Create and Manage Python Virtual Environments

    It is pretty common to see Python developers installing and upgrading packages from standard and non-standard sources to develop applications. Reasons could range from using a newer version of a module to using a specific version in case there is a regression.

    These requirements and use cases can be a pain to manage when different applications require different versions of the same library. Thankfully, Python provides a robust solution to isolate development environments using virtual environments.

  • Best Cloud Based IDEs for Python

    Development environments are increasingly moving in the cloud in part or full, allowing programmers to access and collaborate on their projects on the go. Numerous such services have been launched in the past few years, especially for web developers writing code in Node.js, HTML, JavaScript and CSS. However there are very few such options available for Python, despite being one of the most popular and fastest growing programming languages.
    This article will list various IDEs and text editors available in the cloud for creating Python programs.

  • Keep These Portable Python Builds for Linux Always With You

    Most Linux distributions come with pre-installed Python packages. These packages are deeply integrated into the OS and they depend on shared libraries. If you want to keep Python projects isolated, using virtual environments is an excellent option. Another realistic option would be to use Python installed on an external drive as a portable package that you can carry it at your convenience (useful for teaching for example).
    Unfortunately, as far as portability of Python is concerned, Linux users don’t have much choice. While compiling Python with shared libraries is easy, building Python with statically linked libraries takes more than a few tweaks, patches and changing lines in source code.

    This article will list the few portable Python options available for Linux. Note that any of the methods mentioned below will work on external drives formatted in NTFS or EXT3/EXT4 file systems only. FAT32 file system doesn’t support symlinks which is a requirement for these packages to work.

  • Linux System Call Tutorial with C

    While it’s inevitable you’ll use a system call at some point in your C development career, unless you are targeting high performance or a particular type functionality, the glibc library and other basic libraries included in major Linux distributions will take care of the majority of your needs.

    The glibc standard library provides a cross-platform, well-tested framework to execute functions that would otherwise require system-specific system calls. For example, you can read a file with fscanf(), fread(), getc(), etc., or you can use the read() Linux system call. The glibc functions provide more features (i.e. better error handling, formatted IO, etc.) and will work on any system glibc supports.

    On the other hand, there are times where uncompromising performance and exact execution are critical. The wrapper that fread() provides is going to add overhead, and although minor, isn’t entirely transparent. Additionally, you may not want or need the extra features the wrapper provides. In that case, you’re best served with a system call.

    You can also use system calls to perform functions not yet supported by glibc. If your copy of glibc is up to date, this will hardly be an issue, but developing on older distributions with newer kernels might require this technique.

    Now that you’ve read the disclaimers, warnings, and potential detours, now let’s dig into some practical examples.

  • subdirmk - ergonomic preprocessing assistant for non-recursive make

    Peter Miller's 1997 essay Recursive Make Considered Harmful persuasively argues that it is better to arrange to have a single make invocation with the project's complete dependency tree, rather than the currently conventional $(MAKE) -C subdirectory approach.

    These problems are not theoretical for me. In the Xen Project we use recursive make and sadly suffer from occasional concurrency bugs. In my work on secnet (the currently rather unproductised greenend.org.uk vpn program) I have been frustrated by unreliability of the build system (which is developing fairly rapidly, as I overhaul secnet) .

    However, actually writing a project's build system in a non-recursive style is not very ergonomic. I was complaining about this in the pub a week or two ago. Accepting my challenge, Mark Wooding demonstrated a proof of concept showing that it was possible to do better. I thought I had a better approach so I took his code and I ran with it.

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.