Work Notes

5 Entries

Professional2025-12-24 · 22 min

ty from Astral: four minutes of mypy became five seconds

16 December 2025 Astral shipped ty beta. Home Assistant, which mypy chewed for minutes, finishes in seconds. Real intersection types. No django-stubs yet. Beta is printed on the box.

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2025-12-20·25 min

WebSocket vs SSE vs Long Polling: Choosing Real-time in 2025

Honest comparison of three real-time communication approaches: WebSocket, Server-Sent Events, and Long Polling. When to use each, production pitfalls, and production-ready FastAPI examples.

#Python
#FastAPI
#WebSocket

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2025-12-16·16 min

FastAPI and Django 5 after eight months both ways

One API got twice as fast. Another team was back on Django in a week. Numbers, async traps, and the point after which stars on GitHub stop being a reason.

#Python
#FastAPI
#Django

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2025-12-05·20 min

28 Pydantic v1 models, six evenings, three fires on the bench

June 2023. A study project, 28 models, about 2000 req/s. Validation latency from 12 ms to 3. Feature flags broke at 2 a.m. Unit tests did not see it.

#Python
#Pydantic
#Migration

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2025-11-29·15 min

yield does not return a list. It freezes the function

Interviews ask about yield. Few people say the function stops, keeps the frame, and continues on the same line. Then send, throw, yield from, and where a generator lies.

#Python
#Generators
#Interview

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