#Python
117 posts
Modern Python in Practice #4: Authentication — OAuth2 Password Flow + JWT
Password hashing (argon2/bcrypt), the OAuth2 password flow, JWT issuance/verification, and a clean current_user dependency for authenticated routes.
Modern Python in Practice #3: Connecting a DB — SQLAlchemy 2.x + Alembic
SQLAlchemy 2.x's new style — Mapped/mapped_column, async sessions, integration with FastAPI's dependency injection, and Alembic migrations.
Modern Python in Practice #2: Routing, Pydantic Models, and Dependency Injection
Splitting routes with APIRouter, defining input/output schemas with Pydantic v2, and unraveling shared logic cleanly with Depends.
Modern Python FastAPI #1 Getting Started and Setup
Why FastAPI, first project setup with uv, Hello FastAPI, automatic OpenAPI/Swagger UI generation — all in one place.
Modern Python Advanced #7 Performance — cProfile, py-spy, Memory Profiling
A toolbox for finding and fixing slow Python code — timeit, cProfile, py-spy, line_profiler, memray, and common optimization patterns.
Modern Python Advanced #6: Advanced typing — Variance, ParamSpec, Self, overload
Next step from intermediate typing — covariance/contravariance, ParamSpec and Concatenate, Self, TypeGuard/TypeIs, and @overload.
Modern Python Advanced #5: GIL and concurrency — threading vs multiprocessing vs asyncio
What the GIL is, the role of threading/multiprocessing/asyncio, and the free-threaded build of Python 3.13–3.14 (PEP 703/779) — all in one place.
Modern Python Advanced #4: Async in depth — event loop, gather/wait, async generator
The next step from intermediate intro — how the event loop actually works, the difference between Future and Task, gather vs wait, async generator, and async iteration.
Modern Python Advanced #3: Metaclasses — when do you really need them?
Classes that build classes — what type really is, division of labor with __init_subclass__, what class decorators can solve, and the narrow places where you really need a metaclass.
Docker in Practice #1: Containerizing FastAPI — uv, Multi-stage, non-root
First post of the practice series. Containerizing the most common scenario — a FastAPI app. Slim base on uv, multi-stage to separate build from runtime deps, a non-root user, and HEALTHCHECK — in a shape that goes straight to production.
Modern Python Advanced #2: Descriptors and __set_name__
How property works — the __get__/__set__ protocol and data/non-data descriptors, and clean validation fields with __set_name__.
Modern Python Advanced #1: Magic methods in depth and protocols
Every hook where Python objects integrate with language features — __call__, __getitem__, __hash__, __format__, __getattr__ — gathered in one place.