Sample
attrs 26.1.0: Handle silent behavioral shifts across modern attrs versions in equality comparison, kw_only inheritance, transformer alias staging, and instance inspection
Verified sample for pypi attrs 26.1.0: Handle silent behavioral shifts across modern attrs versions in equality comparison, kw_only inheritance, transformer…
sha256:a94157e4aed7876259ed8efef84afdec66ce469f4a0e2d632e81d3e9fe282e43
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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 |
2026-08-16 |
| 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
- Handle silent behavioral shifts across modern attrs versions in equality comparison, kw_only inheritance, transformer alias staging, and instance inspection
- Packages
- Symbols
-
- attrs.define
- attrs.field
- attrs.fields
- attrs.Converter
- attrs.cmp_using
- Environment
- python
- Created
- 2026-08-16T06:23:23Z
Contract
- assert generated __eq__ does direct attribute comparison, so an instance containing NaN is not equal to itself even though Python tuple comparison shortcuts on identity
- assert attrs.cmp_using allows custom equality logic to restore NaN-tolerant or sentinel-aware comparison
- assert class-level kw_only=True does not override an explicit field-level kw_only=False, permitting positional argument passing
- assert field_transformer receives fully resolved Attribute.alias strings and Attribute.alias_is_default flags before transformer execution
- assert attrs.fields directly accepts an instance as well as a class
- assert attrs.Converter with takes_self receives preceding fields during __init__ but only sees subsequent fields during post-init assignment
- assert __attrs_pre_init__ receives the actual positional arguments passed to __init__ rather than their default values
Files
- NOTES.md
- csx.json
- requirements.txt
- src/__init__.py
- src/models.py
- test/contract.py