Avoiding empty strings in non-nullable Django string-based model fields

Django silently converts None values in non-nullable string fields into empty strings, but a simple CheckConstraint can enforce truly required values and prevent empty data from slipping into your database.

Comparing Python packages for A/B test analysis (with code examples)

Okmain: you have an image but you want a colour

DeepSeek-V3 Model: Theory, Config, and Rotary Positional Embeddings

Making Django unique constraints case-insensitive (with no downtime)

Fix Django’s case-sensitive unique constraint pitfalls by cleaning duplicates, adding Lower() constraints, and safely migrating with PostgreSQL CONCURRENTLY to avoid downtime.

Building a Hypervisor in Python with KVM

Custom Data Structures in E-Graphs

RAG vs GraphRAG: When Agents Hallucinate Answers

Deprecate confusing APIs like “os.path.commonprefix()”

Managing Shared Data Science Code With Git Submodules

Learn how to manage shared code across projects using Git submodules. Prevent version drift, maintain reproducible workflows, and support team collaboration with practical examples.

How the Self-Driving Tech Stack Works

A technical guide to how self-driving cars actually work. CAN bus protocols, neural networks, sensor fusion, and control system with open source implementations, most of which can be accessed through Python.

Unit Testing: Catching Speed Changes

This second post in a series covers how to use unit testing to ensure the performance of your code. This post talks about catching differences in performance after code has changed.

The *1000 most popular* Django packages

Based on GitHub stars and PyPI download numbers.

Python Type Checker Comparison: Empty Container Inference

Stop Ignoring RFC 2324. It's the Most Important Protocol You've Never Implemented.

Vector Search Using Ollama for Retrieval-Augmented Generation (RAG)

LangChain Python Tutorial: 2026’s Complete Guide

If you’ve read the blog post How to Build Chatbots With LangChain, you may want to know more about LangChain. This blog post will dive deeper into what LangChain offers and guide you through a few more real-world use cases.

5 Essential Itertools for Data Science

Learn 5 essential itertools methods to eliminate manual feature engineering waste. Replace nested loops with systematic functions for interactions, polynomial features, and categorical combinations.

Vector Search with FAISS: Approximate Nearest Neighbor (ANN) Explained

ScrapeGraph - Natural Language Web Scraping

Web scraping without selector maintenance. ScrapeGraphAI uses LLMs to extract data from any site using plain English prompts and Pydantic schemas.