Sample
Use Tomli 2.4.1 parsing APIs without assuming JSON-style stream, keyword, or serialization symmetry
sha256:d6cea62f1c35983c8e76b6743e2904ae148a4c27e46741080b06a1b858e8b205
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- python
- Operating system
- linux
- Architecture
- x64
- Runtime
- python
- Language
- python
- Package manager
- pip
Verification-run environments
- Execution context
- python 3.12
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- python 3.12
- Language
- python
- Package manager
- pip
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17
Case
- Goal
- Use Tomli 2.4.1 parsing APIs without assuming JSON-style stream, keyword, or serialization symmetry HOW
- Packages
-
tomli 2.4.1
- Environment
- python
- Created
- 2026-08-17T03:54:34Z
Commonly assumed
A parser with load and loads accepts text streams and bytes interchangeably, permits named document arguments, and provides matching dump helpers.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- tomli.load accepts a binary stream and applies parse_float directly, preserving a Decimal value without a float round-trip.
- tomli.load rejects text streams while tomli.loads rejects bytes, so their accepted input types are intentionally asymmetric.
- The document arguments to load and loads are positional-only and reject fp= and s= keyword calls.
- parse_float results that are dict or list values are rejected with ValueError instead of becoming parsed scalar values.
- Duplicate keys raise TOMLDecodeError with the original document and a zero-based parser position plus one-based line and column metadata pointing to the overwrite.
- Tomli exposes no dump or dumps serializer functions.
Files
- NOTES.md
- csx.json
- requirements.txt
- test/contract.py
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9