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Programming Leftovers

Submitted by Roy Schestowitz on Thursday 21st of May 2020 08:10:00 PM Filed under
Development
  • Subinterpreters for Python

    A project that has been floating around in the Python world for a number of years is now working its way toward inclusion into the language—or not. "Subinterpreters", which are separate Python interpreters that can currently be created via the C API for extensions, are seen by some as a way to get a more Go-like concurrency model for Python. The first step toward that goal is to expose that API in the standard library. But there are questions about whether subinterpreters are actually a desirable feature for Python at all, as well as whether the hoped-for concurrency improvements will materialize.

  • Wing Tips: Conditional Breakpoints Wing's Python Debugger

    This Wing Tip describes how to use conditional breakpoints in Wing Pro to stop in Python code only when certain conditions are true. This is useful for isolating a single case out of many that may be processed by the same code in a particular run, in order to investigate how that case is being handled.

    Conditional breakpoints are also a great way to select the runtime state for which you want to write new Python code, with the ability to immediately try out what you write.

  • Santiago Zarate: Looking for exceptions with awk

    Sometimes you just need to search using awk or want to use plain bash to search for an exception in a log file, it’s hard to go into google, stack overflow, duck duck go, or any other place to do a search, and find nothing, or at least a solution that fits your needs.

  • The state of the AWK

    AWK is a text-processing language with a history spanning more than 40 years. It has a POSIX standard, several conforming implementations, and is still surprisingly relevant in 2020 — both for simple text processing tasks and for wrangling "big data". The recent release of GNU Awk 5.1 seems like a good reason to survey the AWK landscape, see what GNU Awk has been up to, and look at where AWK is being used these days.

    The language was created at Bell Labs in 1977. Its name comes from the initials of the original authors: Alfred Aho, Peter Weinberger, and Brian Kernighan. A Unix tool to the core, AWK is designed to do one thing well: to filter and transform lines of text. It's commonly used to parse fields from log files, transform output from other tools, and count occurrences of words and fields. Aho summarized AWK's functionality succinctly:

    AWK reads the input a line at a time. A line is scanned for each pattern in the program, and for each pattern that matches, the associated action is executed.

  • NuShell: the shell where traditional Unix meets modern development, written in Rust

    Shells have been around forever and, for better or for worse, haven’t changed much since their inception. Until NuShell appeared to reinvent shells and defy our muscle memory. It brought some big changes, which include rethinking how pipelines work, structured input/output, and plugins.

    We wanted to learn more about NuShell so we interviewed both of its creators: Jonathan Turner and Yehuda Katz.

  • Marcin 'hrw' Juszkiewicz: From a diary of AArch64 porter — firefighting

    When I was a kid there was a children’s book about Wojtek who wanted to be firefighter. It is part of culture for my generation.

    I never wanted to follow Wojtek’s dreams. But during last years I became firefighter. And this is not a good thing in a long term.

    CI failures

    During last months we (Linaro) took care of AArch64 support in OpenStack infrastructure. There are nodes with CentOS 7 and 8, Debian ‘stretch’ and ‘buster, Ubuntu ‘xenial’, ‘bionic’ and ‘focal’. And several CI jobs in some projects (Disk Image Builder, Kolla, Nova and some other).

  • What's coming in Go 1.15

    Go 1.15, the 16th major version of the Go programming language, is due out on August 1. It will be a release with fewer changes than usual, but many of the major changes are behind-the-scenes or in the tooling: for example, there is a new linker, which will speed up build times and reduce the size of binaries. In addition, there are performance improvements to the language's runtime, changes to the architectures supported, and some updates to the standard library. Overall, it should be a solid upgrade for the language.

    Since the release of Go 1.0, the Go team has consistently shipped improvements to the tooling and the standard library with each version, but has always been conservative about language changes. Many other languages ship significant language features every release, but Go has only shipped a few minor ones in the versions since 1.0.

    This is a conscious design choice: since the 1.0 release, the emphasis from the team has been stability and simplicity. The Go 1 compatibility promise guarantees that all programs written for Go 1.0 will continue to run correctly, unchanged, for all 1.x versions. Go programmers usually see this as a good thing — their programs continue to "just work", but generally get consistently faster.

  • Daniel Holbach: Gitops Days - Day 1 playlist

    What a brilliant day 1 of GitOps Days it was. Weeks of hard work from a great team went into this, as was quite apparent. Minor glitches, some last minute shuffling of speakers, but apart from that very very seamless. (You can still sign up and get links to the recordings.)

  • Automating tasks in Qt Creator

    My first project when I entered KDAB was the migration of a multi-million lines Motif application to Qt… feels quite scary said like that. Fortunately, migrations from any toolkit to Qt is something KDAB has been doing from the beginning, and has lots of experience with.

    You may be wondering what this has to do with automating tasks in Qt Creator, or why I have a new entry in my Qt Creator locator… keep up with me and everything will be clear shortly.

»

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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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