Sample
Construct, inspect, and stream-serialize native Polars expressions using PyExpr, col, lit, and when in polars-runtime-32
sha256:9c2cefb58fbf7782c12166c67d9b70e65d0307bb2f902cbaffd7293d7e6b0bc5
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
- 1
- Signing keys that built it
- 1
Declared environment
linux 24 · ubuntu · glibc 2.39 x64 pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| python 3.12 · linux alpine/x64 · docker ed25519:c1973797be207ac4 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1python:3.12-alpine@sha256:d09d15e60962… |
2026-08-27 |
Case
HOW- Goal
- Construct, inspect, and stream-serialize native Polars expressions using PyExpr, col, lit, and when in polars-runtime-32
- Packages
- Symbols
-
- _polars_runtime.PyExpr
- _polars_runtime.col
- _polars_runtime.lit
- _polars_runtime.when
- Created
- 2026-08-27T20:37:34Z
Contract
- assert pr.lit(42) raises TypeError requiring allow_object and is_scalar positional arguments
- assert pr.col('price').meta_is_column() is True and meta_root_names() == ['price']
- assert (pr.col('price') * pr.lit(1.1, False, True)).alias('total_price').meta_output_name() == 'total_price'
- assert meta_undo_aliases() reverts aliased expression output name back to 'price'
- assert meta_is_column_selection(allow_aliasing) and meta_is_literal(allow_aliasing) require explicit boolean flag
- assert when/then/otherwise builds conditional PyExpr reflecting predicate root names
- assert PyExpr.serialize_json and serialize_binary accept stream buffers and deserialize to equal expressions via meta_eq
Files
- NOTES.md
- PROMPT.md
- csx.json
- requirements.txt
- spec.json
- test/contract.py
Origin Seeder
anonymous