Python

Programming Language

Jason Yang · 22 Mar, 2026

When to use HashSet, LinkedHashSet, or TreeSet in Java: their differences explained simply, and how they map to Python's set, dict, and sorted().

Framework

Jason Yang · 23 Jan, 2026

Pydantic v2 settings give you type-safe, environment-driven config. Covers default, default_factory, and FastAPI integration best practices.

Programming Language

Jason Yang · 08 Jan, 2026

FastAPI dependency injection is a request-scoped resource engine, not just object passing. Covers lifecycles, dependency chains, testing, and clean architecture.

Programming Language

Jason Yang · 08 Jan, 2026

The Python Singleton pattern ensures one instance per process. Here are the Pythonic ways to do it (module-level, decorator, metaclass), plus thread safety and when not to use it.

AI & LLM

Jason Yang · 03 Jan, 2026

Generate speaker-labeled subtitles on Ubuntu 24.04 with Whisper and pyannote.audio (CUDA GPU) — a full working setup from Python 3.10 to a combined transcript + speaker SRT.

Programming Language

Jason Yang · 30 Nov, 2025

Pydantic vs dataclass: use Pydantic to validate incoming data, dataclasses for internal structures. Real examples and where each one breaks.

Cloud & DevOps

Jason Yang · 25 Nov, 2025

Publish private Python libraries to GCP Artifact Registry with Poetry: the critical publish-vs-install URL distinction that avoids 404s, plus auth tokens.

Programming Language

Jason Yang · 17 Nov, 2025

Manage FastAPI projects with Poetry: project setup, dependency locking, virtual environments, and testing — the full pyproject.toml workflow for teams.

Programming Language

Jason Yang · 17 Nov, 2025

Migrating Pydantic v1 to v2 in a FastAPI project? Here's the full v1→v2 checklist plus the validator, settings, and config changes that break.