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Your First Extension

In this topic, we'll teach you the fundamental concepts for building extensions. Make sure you have Node.js and Git installed, then install Yeoman and VS Code Extension Generator with:

Black is "the uncompromising Python code formatter." It can be configured to automatically format your code whenever you save a file in VSCode.

GitLens supercharges the Git capabilities built into VS Code. Whether you’re a seasoned Git developer or just getting started, GitLens makes it easier, safer and faster to leverage the full power of Git. This GitLens tutorial will show you how to use GitLens in VS Code and get the most out of the tool. Sign up for GitLens+ to get the most out of your experience - it’s free: OpenVSX: GitLens

• 0:00 Welcome to GitLens
• 0:17 Inline Blame and Hover Support
• 0:49 File Blame
• 1:43 Git CodeLens
• 2:15 Sidebar Views
• 3:01 Customize your experience

This PostgreSQL Python section shows you how to work with the PostgreSQL database using the Python programming language.

Python has various database drivers for PostgreSQL. Currently, the psycopg is the most popular PostgreSQL database adapter for the Python language. The psycopg fully implements the Python DB-API 2.0 specification.

The current version of the psycopg is 2 or psycopg2. The psycopg2 database adapter implemented in C as a libpq wrapper resulting in both fast and secure. The psycopg2 provides many useful features such as client-side and server-side cursors, asynchronous notification and communication, COPY command support, etc.

Besides, the psycopg2 driver supports many Python types out-of-the-box. The psycopg2 matches Python objects to the PostgreSQL data types, e.g., list to the array, tuples to records, and dictionary to hstore. If you want to customize and extend the type adaption, you can use a flexible object adaption system.

Learn Vimscript the Hard Way is a book for users of the Vim editor who want to learn how to customize Vim.

It is not a guide to using Vim. Before reading this book you should be comfortable editing text in Vim and know what terms like "buffer", "window" and "insert mode" mean.

The book is divided roughly into three sections:

• The first covers basic Vim commands that you can use in your ~/.vimrc file to customize Vim quickly and easily.
• The second looks more deeply at Vimscript as a programming language, covering things like variables, comparisons, and functions.
• The third walks through the creation of a sample plugin intended for distribution to other Vim users.
  The book is copyright 2013 by Steve Losh, all rights reserved. You can redistribute this HTML version as long as you don't make any changes and don't charge for it.

The book will always be free to read online.

Für dieses Tutorial habe ich eine Installation mit Debian 11.1 (Bullseye) verwendet. Auf dem Host existieren die beiden User Alice und Bob, welche für die Nutzung von rootless-Podman vorbereitet werden.

Die Einrichtung von rootless-Podman unter Debian Bullseye

Rootless-Container haben die Eigenschaft, dass sie in User Namespaces (siehe user_namespaces(7) und namespaces(7)) ausgeführt werden. UIDs und GIDs, welche innerhalb des Containers existieren, werden dabei auf UIDs/GIDs des Hosts abgebildet. So besitzt ein Prozess, welcher innerhalb eines Containers mit der UID 0 (root) läuft, außerhalb des Containers bspw. die UID 165537 und damit die Rechte eines normalen Benutzers.

Mit den XBee Modulen können verschiedene Netzwerkarchitekturen aufgesetzt werden. Ich verwende nur eine direkte Verbindung zwischen den beiden Modulen. Dieser Verbindungstyp ist voreingestellt und funktioniert auf Anhieb mit den XBee Pro Modulen. Natürlich kann man hier noch eigene Einstellungen vornehmen wie der Name der Verbindung bzw. das Netzwerkes heißen soll. Das empfiehlt sich wenn mehrere XBee / ZigBee Netzwerke in direkter Nähe zueinander betrieben werden. Ich benötige die Datenübertragung zwischen meiner Basistation und der mobilen Einheit für die genaue differential GPS Positionierung mit der RTK Bibliothek meines Roboters.

Als erstes werden einfach die XBee Pro Module auf die XBee Explorer USB Adapter gesetzt und via USB-Kabel am Raspberry Pi angeschlossen. Ich habe meine beiden Module jeweils an die Basistation und an die mobile Einheit angeschlossen.

There’s an amazing amount of data available on the Web. Many web services, like YouTube and GitHub, make their data accessible to third-party applications through an application programming interface (API). One of the most popular ways to build APIs is the REST architecture style. Python provides some great tools not only to get data from REST APIs but also to build your own Python REST APIs.

In this tutorial, you’ll learn:

• What REST architecture is
• How REST APIs provide access to web data
• How to consume data from REST APIs using the requests library
• What steps to take to build a REST API
• What some popular Python tools are for building REST APIs

By using Python and REST APIs, you can retrieve, parse, update, and manipulate the data provided by any web service you’re interested in.

This teaches you bpftrace for Linux in 12 easy lessons, where each lesson is a one-liner you can try running. This series of one-liners introduces concepts which are summarized as bullet points. For a full reference to bpftrace, see the Man page

Contributed by Brendan Gregg, Netflix (2018), based on his FreeBSD DTrace Tutorial.

Starting Forth, First Edition is from 1981. These web pages were designed in 2003, when it became apparent that SF would never be re-issued by the copyright holder. A small supply of about 500 books was all that was left.

When you can get hold of the original, do so.

In this transcript Forth code has been ANSified. The samples should run on, at least, iForth and SwiftForth. Where necessary, statements that were valid in 1981 have been exchanged with statements more appropriate for 2003 (when this tribute was written).

Starting Forth is full of very difficult to reproduce graphics. These enormously enhance the text's mnemonic value, and are invaluable for a first-time Forth user. I have therefore added "substitute" graphic elements, roughly at the same spot where they are in the original. The original graphics are, of course, much better.

In this transcript I have assumed a 32-bit, byte-addressing Forth, with 8-bit characters. The address returned by WORD is assumed to be HERE. This allows the common trick of ALLOTing length of str CHARS after using WORD in order to compile string str to memory. Multitasking issues are ignored (e.g. no >TYPE, just TYPE). Division is symmetric, not floored, and two's complement is assumed throughout. Most Forths should not have problems with this. Chapter 7 exploits extended uses of number conversion. Some Forths are broken in this respect, but iForth and SwiftForth do support these neat features.

Dieser kostenlose VIDEO-Kurs hilft Dir in der Ausbildung und dem Studium der Elektrotechnik

Ideal für Schüler und Studenten von

 Fachoberschulen (FOS), Fachschulen 
Beruflichen Gymnasien und Höheren Berufsfachschulen

 Techniker- und Meisterschulen
Fachhochschulen, Technischen Hochschulen/Universitäten in den ersten Semstern

aber auch für

Abiturienten, zur Vorbereitung auf ein technischen Studium und
Praktiker, die ihr theoretisches Wissen auffrischen und ergänzen möchten

Heute möchte ich darüber berichten, was für ein großartiges Tool wireguard ist. Ich beschreibe hier, was es macht, wie man es konfiguriert und welche Möglichkeiten sich daraus ergeben.

Wireguard wird gerne als das neue, schnelle VPN des Linux Kernels beschrieben. Dabei gibt es aber zwei Probleme. Patches liegen für den mainline Linux Kernel schon seit einiger Zeit vor. Dennoch dauern die Diskussionen um eine Aufnahme weiter an, da wireguard eine neue crypto-api einführen möchte. Zweitens vermuten Menschen unter VPN eine Lösung, die einen Client mit einem Netz oder zwei Netze untereinander verbindet, dies leistet wireguard aber gar nicht von Haus aus.

Interested in learning more about low-level specifics of the eBPF stack? Read on as we take a deep dive, from its VM mechanisms and tools, to running traces on remote, resource-constrained embedded devices.

BPF and eBPF are the same thing and the name/acronym doesn't mean much anymore because the project evolved way beyond its initial scope. BPF and eBPF are used interchangeably in the series.

Part 1 and 2 give a condensed in-depth introduction to eBPF for newcommers or those looking to further their knowledge by taking a deep dive into the lower part of the eBPF stack.
Part 3 is an overview of the userspace tooling meant to increase productivity, built on top of the low level VM mechanisms presented in parts 1 and 2.
Part 4 focuses on running eBPF programs on embedded systems which are resource constrained, where a full toolchain stack (BCC/LLVM/python/etc) is undesirable. We'll cross-compile and run eBPF programs on 32 bit ARM with smaller embedded-focused tools. Readers interested only in this part can probably skip the rest.
Part 5 is about tracing userspace: Up until now our efforts were focused on tracing the kernel, so it's about time we also examine other user processes.

I recently worked on creating a bash completion script for one of my toy projects and I enjoyed it very much.

Der Sinn dieser Anwendung ist, die umfangreichen und komplexen Zusammenhänge der Prozesse, die bei der Arbeit mit Git ablaufen, zu verdeutlichen. Ich hoffe du hast Spaß dabei und lernst vielleicht sogar etwas!

As you know, Python leverages polymorphism at its maximum by dealing only with generic references to objects. This makes OOP not an addition to the language but part of its structure from the ground up. Moreover, Python pushes the EAFP appoach, which tries to avoid direct inspection of objects as much as possible.

PostgreSQL TutorialWelcome to the PostgreSQLTutorial.com website! This PostgreSQL tutorial helps you understand PostgreSQL quickly. You will learn PostgreSQL fast through many practical examples. We will show you not only problems but also how to solve them creatively in PostgreSQL.

If you are…

• Looking for learning PostgreSQL fast and easily.
• Developing applications using PostgreSQL as the back-end database management system.
• Migrating from other database management systems such as MySQL, Oracle, Microsoft SQL Server to PostgreSQL.

This tutorial provides a basic Python programmer's introduction to working with protocol buffers. By walking through creating a simple example application, it shows you how to

Define message formats in a .proto file.
Use the protocol buffer compiler.
Use the Python protocol buffer API to write and read messages. 

This isn't a comprehensive guide to using protocol buffers in Python. For more detailed reference information, see the Protocol Buffer Language Guide, the Python API Reference, the Python Generated Code Guide, and the Encoding Reference.