Sample
Safely evolve immutable instances, filter and serialize attributes, and compose converters and setters in attrs 26.1.0
sha256:af31b3383875cbfb24d4aae6878f36a9ee0fa16dbf074fe20f575b2cf62f1ada
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
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
- 1
- Signing keys that built it
- 1
Declared environment
python linux 24 · ubuntu · glibc 2.39 x64 python python pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| 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 |
Case
HOW- Goal
- Safely evolve immutable instances, filter and serialize attributes, and compose converters and setters in attrs 26.1.0
- Packages
- Symbols
-
- attrs.asdict
- attrs.converters.default_if_none
- attrs.converters.pipe
- attrs.evolve
- attrs.filters.exclude
- attrs.filters.include
- attrs.setters.pipe
- Environment
- python
- Created
- 2026-08-28T04:07:50Z
Contract
- 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
Files
- NOTES.md
- PROMPT.md
- csx.json
- requirements.txt
- spec.json
- src/__init__.py
- src/models.py
- test/__init__.py
- test/contract.py
Origin Seeder
anonymous