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Hynek Schlawack

import attrs

An attempt at catharsis. This is a deeply personal blog post about the most influential project I’ve ever created: attrs, the progenitor of modern Python class utilities. I’m retelling its history from my perspective, how it begot dataclasses, and how ...

andreinc

On Tzimtzum

The book Life of Pi, written in 2001 by Canadian author Yann Martel, tells the story of a young Indian boy fascinated by philosophy, spirituality, and religious syncretism from an early age. After a devastating shipwreck on his way to ...

andreinc

A tale of Java Hash Tables

The intended audience for this article is undergrad students who already have a good grasp of Java, or seasoned Java developers who would like to explore an in-depth analysis of various hash table implementations that use Open Addressing. The reader ...

andreinc

Implementing Hash Tables in C

Table of contents Contents Table of contents Code Introduction C++ (unordered_map) Java (HashMap) Python (dict) Performance: Why Size Doesn’t Matter Hash Functions Hash Collisions What makes a “Good” Hash Function? Families of Hashing Functions Division hashing Multiplicative hashing Hashing strings ...

Hynek Schlawack

Subclassing in Python Redux

The conflict between subclassing and composition is as old as object-oriented programming. The latest crop of languages like Go or Rust prove that you don’t need subclassing to successfully write code. But what’s a pragmatic approach to subclassing in Python, ...

Hynek Schlawack

Canonical SEO Failure

This post is less about teaching and more about schadenfreude amusement for you, and catharsis for me. It’s the story of how one unfortunate HTML tag kicked me off almost all search engines and my months-long way back. And why ...

Hynek Schlawack

Lie vs Lay

Lie and lay are infamously confusing to non-native speakers. It’s so bad that it sparked a cottage industry of click-baity articles full of sketchy ads. Since English is my third language, I stumbled a lot myself until I wrote this ...

andreinc

XML to JSON using MapNeat

mapneat is a library I’ve written a long time ago. I am biased. Introduction Following my previous article, I wanted to expand on the capabilities of the mapneat library. In this tutorial, I will show you how to transform an ...

andreinc

Hello world, mapneat!

mapneat is a library I’ve written a long time ago. I am biased. Introduction One of the most common challenges I’ve encountered in Software Engineering is data manipulation: taking a raw data structure, applying business logic, restructuring it, and finally ...

andreinc

Linear transformations, Eigenvectors and Eigenvalues

Contents Introduction Think of matrices as functions Matrix transformations Linear Transformations Eigenvalues and Eigenvectors Why are they “special”? Why are they important? Where to go next Introduction There are rumors saying Computer Vision Engineers consider Eigenvalues and Eigenvectors the single ...

andreinc

Generate random SQL inserts using pysert

pysert (lowercase ‘p’) is a python utility designed to generate random SQL INSERT statements from predefined templates. While its primary focus is SQL, its template-driven nature allows it to generate almost any structured format, including JSON, XML, or YAML. If ...