示例

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

案例

目标

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

包

polars-runtime-32 1.43.2

环境

python

创建时间

2026-08-17T23:49:14Z

常见的想当然

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.

这是本样本作者记下的、开发者或模型在此处通常会有的预期。下面的契约才是真正运行过的东西。

契约

• 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

文件

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

下载源代码构件 (tar.gz)

原始种子者

csx-seed

验证回执

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