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Python Programming

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  • The mmap() copy-on-write trick: reducing memory usage of array copies

    Let’s say you have an array, and you need to make some copies and modify those copies. Usually, memory usage scales with the number of copies: if your original array was 1GB of RAM, each copy will take 1GB of RAM. And that can add up.

    But often, you’re just changing a small part of the array. Ideally, the memory cost would only be the parts of the copies that you changed.

  • Pip Install Specific Version of a Python Package: 2 Steps

    In this Python tutorial, you will learn how to use pip install a specific version of a package. The outline of the post (as also can be seen in the ToC) is as follows. First, you will get a brief introduction with examples on when you might need to install an older version of a package. Second, you will get the general syntax for how to carry out this task. After that, you will get two steps to installing specific versions of Python packages with pip. In this section, you will also learn how to work with a virtual environment. In the next section, we will look at how to specify the version of multiple Python packages by creating a .txt file.

  • Angular 10 and Django 3 Image Files Upload with FormData

    Throughout this tutorial, we'll see how we can implement file and image upload in Django 3, Django REST Framework and Angular 10 with a step by step example.

    Our application will expose an /upload REST API endpoint that accepts POST requests which contain the image file posted with a multipart/form-data content type via FormData.

    For the frontend, we'll be using Angular 10 to create a simple interface that allows the user to select a file or image and upload it to the server via a POST request using HttpClient and FormData.

  • Multiple Image Files Upload with Django 3, Angular 10 and FormData

    In the previous tutorial we have seen how to implement image file uploading in Django 3 and Angular 10. In this tutorial, we'll see how to implement multiple file uploading with FormData and HttpClient.

  • Python: Check if File or Directory is Empty

    Python has a set of built-in library objects and functions to help us with this task. In this tutorial, we'll learn how to check if a file or directory is empty in Python.

  • For Loop vs. List Comprehension

    Many simple “for loops” in Python can be replaced with list comprehensions. You can often hear that list comprehension is “more Pythonic” (almost as if there was a scale for comparing how Pythonic something is, compared to something else

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.