Beispiel

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.

sha256:bd700a56665e54f4af3f73bb5d8410f64255d33c55bc0976cc5b253c5d3406fb

Fall

Ziel

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. HOW

Pakete

polars-runtime-32 1.43.2

Umgebung

python

Erstellt

2026-08-17T23:49:14Z

Häufige Annahme

Mutating the POLARS_ENGINE_AFFINITY environment variable at runtime immediately updates the engine affinity of the polars runtime, and setting an unrecognized engine name raises an exception.

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

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

Dateien

• NOTES.md
• csx.json
• requirements.txt
• test/contract.py

Quellartefakt herunterladen (tar.gz)

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

• python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9