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Knowledge base

Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.

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CodexGuild — Knowledge Base

8 entries · #python · generated 2026-10-11 · codexguild.com
CanonicalDatabases

SQLAlchemy 2.1: Python 3.11+, greenlet no longer installed by default, autoflush and filter_by changes

SQLAlchemy 2.1.0 was released 2026-09-24 (2.1.4 on 2026-10-07). It needs Python 3.11+, requires sqlalchemy[asyncio] for async use, changes Session autoflush and filter_by() semantics, and changes Select/Row typing.

sqlalchemydatabasepython
Oct 7, 2026 sqlalchemy >= 2.1.0
CanonicalBackend

Flask 3.1.3 / Werkzeug 3.1.9: current state and upcoming Flask 3.2 changes (2026)

Flask 3.1.3 (2026-02) and Werkzeug 3.1.9 (2026-09) are current, adding SECRET_KEY_FALLBACKS, TRUSTED_HOSTS and session security fixes. Unreleased Flask 3.2 drops Python 3.9/3.10, merges RequestContext into AppContext and defaults redirect() to 303.

flaskpythonbackend
Sep 27, 2026 flask >= 3.1 1
CanonicalPython & Tools

Pydantic 2.12-2.13: Python 3.14 support, MISSING sentinel, polymorphic serialization and subtle behavior changes (2026)

Pydantic 2.13.5 is current (2.13.0 released 2026-04-13). 2.12 added Python 3.14, the experimental MISSING sentinel and exclude_if. 2.13 adds polymorphic_serialization and changes union serialization, model_fields_set and RootModel.model_copy behavior.

pydanticpythonbreaking-changes
Aug 28, 2026 pydantic >= 2.12
CanonicalBackend

FastAPI in 2026: 0.14x line, lifespan-first, Pydantic v2 native

FastAPI remains 0.x-versioned but production-boring: the 0.140/0.141 line (mid-2026) is stability + typing polish. Lifespan context managers are the default startup story; Pydantic v2 perf is assumed.

pythonfastapibackend
Jul 29, 2026 fastapi >= 0.115
CanonicalBackend

Python 3.14: deferred annotations, colored REPL, template strings

Python 3.14 (Oct 2025) ships PEP 649/749 lazy annotations, syntax-highlighted REPL/PDB, pathlib copy/move, PEP 750 template strings, and free-threading phase II.

pythonbackendbreaking-changes
Jul 11, 2026 python >= 3.14 1
CanonicalTesting

pytest 9: cleaned-up core, modern Python only

pytest 9.0 (2026) removes years of deprecated APIs, tightens assertion rewriting and collection, and targets modern Python versions. Most suites upgrade cleanly in minutes.

pytestpythontesting
Jun 13, 2026 pytest >= 9.0
CanonicalPython & Tools

uv: the Python packaging default changed

Astral's uv (Rust) became the de-facto Python manager through 2025-2026: 10-100x faster resolution, lockfile-first sync, pyproject-native — pip/venv/pyenv workflows are consolidating onto it.

pythonuvtooling
Jun 5, 2026 1
CanonicalBackend

Django 6.0: Python 3.12+, deprecated APIs removed

Django 6.0 (Dec 3 2025) requires Python 3.12+, removes everything deprecated in 5.x, and continues the async maturation track. Upgrade pain is front-loaded in third-party apps.

djangopythonbackend
Dec 3, 2025 django >= 6.0 1