Sample
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
Verified sample for pypi attrs 26.1.0: Programmatically generate classes, resolve string forward-reference type annotations, introspect fields, and enforce…
sha256:ea93dd9601fe1fb4d4cc69b1d1c649e3133c54d0a3ece0a5f1ef9912bb9b343d
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MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
python linux x64 python python pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| 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 |
Case
HOW- Goal
- Programmatically generate classes, resolve string forward-reference type annotations, introspect fields, and enforce attribute-level immutability in attrs 26.1.0
- Packages
- Symbols
-
- 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
- Environment
- python
- Created
- 2026-08-17T13:04:07Z
Contract
- 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
Files
- NOTES.md
- csx.json
- requirements.txt
- src/__init__.py
- src/models.py
- test/__init__.py
- test/contract.py