Sample
polars 1.43.2: Chain Polars 1.43.2 with_columns calls when one derived expression depends on an alias created by another
Verified sample for pypi polars 1.43.2: Chain Polars 1.43.2 with_columns calls when one derived expression depends on an alias created by another. The…
sha256:5ac2d12a9f21b2727533a0527081ef11fdbadf709bd4929b32de101ca87631fb
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 3.12 linux · musl x64 python 3.12 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
- Chain Polars 1.43.2 with_columns calls when one derived expression depends on an alias created by another
- Packages
- Symbols
-
- polars.DataFrame
- polars.DataFrame.with_columns
- polars.LazyFrame.with_columns
- polars.LazyFrame.collect_schema
- polars.LazyFrame.collect
- polars.exceptions.ColumnNotFoundError
- Environment
- python 3.12
- Created
- 2026-08-17T02:15:14Z
Contract
- assert sibling expressions in one DataFrame.with_columns call cannot see a newly created alias and raise ColumnNotFoundError
- assert two chained LazyFrame.with_columns calls expose the derived schema before execution and collect the exact dependent values
- assert the chained lazy operations leave the original DataFrame columns unchanged
Files
- csx.json
- requirements.lock
- requirements.txt
- test/contract.py