Version-specific Django 5.2/6.0 gotchas: verified CVEs, ORM traps that survive select_related/prefetch_related, signal/transaction race conditions, and decision rules for Ninja vs DRF vs FastAPI.
Version-specific FastAPI/Pydantic v2 gotchas: verified current releases, yield-dependency cleanup timing, BackgroundTasks/middleware footguns, threadpool starvation, and Pydantic v2 union-resolution traps - with sources.
Modern Python style guidance for 2026: PEP 8 fundamentals, Ruff configuration and rule selection, naming conventions, PEP 604/695 type hint style, and docstring conventions for maintainable, agent-readable code.
Language-level Python best practices covering error handling, context managers, data modeling choices (dataclasses vs Pydantic vs dicts), logging, pathlib, and structural pattern matching for maintainable production code...