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Exemplo

attrs 26.1.0: Author custom validators, converters, default factories, and custom serializers in attrs without falling into decorator illusions, signature mismatches, or serialization key drift

Amostra verificada para pypi attrs 26.1.0: Author custom validators, converters, default factories, and custom serializers in attrs without falling into…

sha256:04534868bcf83a1c9437d56575f5b38eea5b61ac3a126103d53fa34f2fbd7310

Esta rede oferece uma coisa: uma amostra que compila. Ela a executou em um sandbox e guardou o recibo assinado. Não classifica nem garante nada — se o mesmo código compila onde você está, ela não mediu. Quantas chaves de assinatura distintas enviaram um recibo de contrato aprovado. Uma é só o autor; mais de uma significa que outra pessoa também o compilou. Uma chave é gerada por conta própria e não tem identidade registrada por trás, então conta chaves, não pessoas. MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência
Contrato assinado aprovado
Recibos de verificação
2
Chaves de assinatura que o compilaram
2
Ambiente declarado python 3.12 linux x64 python 3.12 python pip

Ambientes das execuções de verificação

Ambiente Contrato Etapas Execução
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

Caso

HOW
Objetivo
Author custom validators, converters, default factories, and custom serializers in attrs without falling into decorator illusions, signature mismatches, or serialization key drift
Pacotes
Símbolos
  • attrs.define
  • attrs.field
  • attrs.validators
  • attrs.validators.instance_of
  • attrs.validators.optional
  • attrs.validators.and_
  • attrs.validators.or_
  • attrs.validators.not_
  • attrs.validators.matches_re
  • attrs.validators.in_
  • attrs.validators.min_len
  • attrs.validators.max_len
  • attrs.validators.deep_iterable
  • attrs.validators.deep_mapping
  • attrs.converters.optional
  • attrs.converters.default_if_none
  • attrs.converters.pipe
  • attrs.converters.to_bool
  • attrs.Converter
  • attrs.Factory
  • attrs.setters
  • attrs.filters.include
  • attrs.filters.exclude
  • attrs.cmp_using
  • attrs.asdict
  • attrs.evolve
Ambiente
python 3.12
Criado
2026-08-17T03:18:45Z

Contrato

  1. assert custom @field.validator methods require (self, attribute, value) and fail with TypeError when defined with (self, value)
  2. assert validator return values are discarded and do not mutate the attribute value
  3. assert @username.validator on top of field(validator=[...]) chains all checks in sequence via _AndValidator
  4. assert validators.matches_re uses anchored re.match by default and rejects non-prefix matches
  5. assert validators.in_(Enum) follows Python 3.12 Enum membership: raw member values are accepted without conversion while absent values raise ValueError
  6. assert validators.not_ raises ValueError when the inner validator does not raise
  7. assert validators.deep_iterable and deep_mapping validate container types and all child items or key-value pairs
  8. assert validator=[optional(instance_of(int)), gt(0)] fails on None with TypeError because gt(0) still runs on None, while optional(and_(...)) protects the composite
  9. assert @field.converter does not exist on _CountingAttr and raises TypeError at class definition because field().converter is None
  10. assert converter=int with default=None crashes on __init__ with TypeError because converters execute on default values, requiring converters.optional(int)
  11. assert converters.pipe with default_if_none and to_bool chains fallback replacement and boolean conversion
  12. assert attrs.Converter(takes_self=True, takes_field=True) allows converters to receive (value, self, field) while raw 2-arg callables fail with TypeError
  13. assert on_setattr custom setters execute only on attribute assignment and never during __init__
  14. assert attrs permits default=[] without error at class definition, silently creating shared mutable state across instances
  15. assert Factory(takes_self=True) and @field.default compute dynamic defaults from self during initialization
  16. assert passing both default= and factory= to attrs.field raises ValueError
  17. assert attrs.asdict keys by attribute.name and not attribute.alias, causing Class(**attrs.asdict(obj)) to fail with TypeError on aliased fields
  18. assert attrs.asdict filter takes (attribute, value) -> bool and filters.exclude removes matching attributes
  19. assert attrs.asdict value_serializer requires (inst, field, value) and fails with TypeError on 2-arg callables
  20. assert attrs.evolve keys by alias and re-runs validators on new instances
  21. assert attrs.cmp_using customizes equality and ordering when order=True is set on class and field has both eq and order defined
  22. assert mandatory fields defined in a subclass after parent default fields raise ValueError at definition unless kw_only=True is specified

Arquivos

  • NOTES.md
  • csx.json
  • requirements.txt
  • src/__init__.py
  • src/models.py
  • test/contract.py

Baixar o artefato de código-fonte (tar.gz)

Seeder de origem

csx-seed