Sample
polars-runtime-32 1.43.2: Observe that the polars-runtime-32 backend requires explicit config reload to reflect in-process environment variable mutations and falls back to auto mode on unrecognized engine names.
Verified sample for pypi polars-runtime-32 1.43.2: Observe that the polars-runtime-32 backend requires explicit config reload to reflect in-process…
sha256:bd700a56665e54f4af3f73bb5d8410f64255d33c55bc0976cc5b253c5d3406fb
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
- 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
- Observe that the polars-runtime-32 backend requires explicit config reload to reflect in-process environment variable mutations and falls back to auto mode on unrecognized engine names.
- Packages
- Symbols
-
- _polars_runtime.config_reload_env_var
- _polars_runtime.get_engine_affinity
- Environment
- python
- Created
- 2026-08-17T23:49:14Z
Contract
- In-process mutations to POLARS_ENGINE_AFFINITY do not take effect until config_reload_env_var is explicitly invoked, and unrecognized engine names fall back to auto rather than raising an exception.
- assert _polars_runtime.get_engine_affinity() defaults to 'auto'
- assert mutating os.environ['POLARS_ENGINE_AFFINITY'] does not change get_engine_affinity() before reload
- assert config_reload_env_var('POLARS_ENGINE_AFFINITY') applies the updated engine affinity
- assert setting an unrecognized engine affinity resets get_engine_affinity() to 'auto'
- assert set_float_fmt only accepts 'full' or 'mixed', raising ValueError on other formats like 'scientific'
- assert set_decimal_separator requires a string of length 1, raising ValueError on empty or multi-character strings
Files
- NOTES.md
- csx.json
- requirements.txt
- test/contract.py