サンプル

Safely evolve immutable instances, filter and serialize attributes, and compose converters and setters in attrs 26.1.0

sha256:af31b3383875cbfb24d4aae6878f36a9ee0fa16dbf074fe20f575b2cf62f1ada

MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

宣言された環境 python linux 24 · ubuntu · glibc 2.39 x64 python python pip

環境	コントラクト	ステージ	実行日
python 3.12 · linux alpine/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1python:3.12-alpine@sha256:d09d15e60962…	2026-08-28

HOW

ゴール: Safely evolve immutable instances, filter and serialize attributes, and compose converters and setters in attrs 26.1.0
パッケージ: attrs 26.1.0
シンボル: attrs.asdict
attrs.converters.default_if_none
attrs.converters.pipe
attrs.evolve
attrs.filters.exclude
attrs.filters.include
attrs.setters.pipe
環境: python
作成日: 2026-08-28T04:07:50Z

assert attrs.evolve creates new instances with updated fields on frozen classes while keeping original instances intact
assert attrs.evolve runs converters and validators on modified attribute values
assert attrs.evolve raises TypeError on unknown attributes or init=False fields and NotAnAttrsClassError on non-attrs classes
assert attrs.evolve preserves subclass identity and inherited attributes across class hierarchies
assert attrs.converters.pipe chains multiple transformation functions sequentially
assert attrs.converters.default_if_none provides scalar fallbacks or executes a factory on None
assert attrs.setters.pipe chains convert and validate hooks on attribute mutation
assert attrs.asdict supports attribute filtering via attrs.filters.include and attrs.filters.exclude by type and Attribute object
assert attrs.asdict retains container collection types and allows selective value transformation via value_serializer
assert attrs.asdict supports shallow serialization when recurse=False

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