サンプル

attrs 26.1.0: Programmatically generate classes, resolve string forward-reference type annotations, introspect fields, and enforce attribute-level immutability in attrs 26.1.0

検証済みサンプル — pypi attrs 26.1.0: Programmatically generate classes, resolve string forward-reference type annotations, introspect fields, and enforce…

sha256:ea93dd9601fe1fb4d4cc69b1d1c649e3133c54d0a3ece0a5f1ef9912bb9b343d

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 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:d91480838ac982c9	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1	2026-08-17
python 3.12 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1	2026-08-18

HOW

ゴール: Programmatically generate classes, resolve string forward-reference type annotations, introspect fields, and enforce attribute-level immutability in attrs 26.1.0
パッケージ: attrs 26.1.0
シンボル: attrs.resolve_types
attrs.make_class
attrs.fields_dict
attrs.fields
attrs.has
attrs.validate
attrs.astuple
attrs.filters.exclude
attrs.setters.frozen
attrs.exceptions.FrozenAttributeError
attrs.exceptions.FrozenInstanceError
attrs.exceptions.NotAnAttrsClassError
環境: python
作成日: 2026-08-17T13:04:07Z

attrs.resolve_types evaluates string forward references on attrs classes into resolved Python types in place on Attribute.type, while raising NotAnAttrsClassError on non-attrs classes
assert attrs.make_class dynamically constructs slotted, frozen, and validated attrs classes with full field definition support
assert attrs.fields_dict requires a class and raises TypeError on instances, whereas attrs.fields accepts both classes and instances
assert attrs.has returns True for attrs classes and instances and False for standard Python objects
assert on_setattr=setters.frozen raises FrozenAttributeError on field mutation while @frozen raises FrozenInstanceError
assert attrs.validate manually re-evaluates all field validators against current instance state on demand
assert attrs.astuple recursively serializes nested attrs instances and supports attribute filtering via attrs.filters.exclude
assert initialization lifecycle sequence executes __attrs_pre_init__, converters, validators with converted values, and __attrs_post_init__ deterministically