polspec
Declare a Polars schema once. Generate data that matches it, and validate data against it — from the same declaration.
Early alpha. The API, the YAML format, and the exact values a given seed produces are all still moving. See Roadmap and stability before depending on any of it.
import polars as pl
from polspec import ColSpec, FrameSpec
class Orders(FrameSpec):
order_id = ColSpec(pl.Int64, bounds=(1, None), unique=True)
status = ColSpec(pl.Enum(["NEW", "PAID", "SHIPPED"]))
total = ColSpec(pl.Float64, bounds=(0.0, None))
placed = ColSpec(pl.Date, nullable=True)
df = Orders.generate(1_000_000, seed=42) # a million rows in well under a second
Orders.validate(df) # raises ValidationError on any breach
A validation library tells you when production data drifted, and
Orders.drift(df) says what moved. A fixture library gives you something to
test against. Keeping both behind one declaration means the fixtures and the
contract cannot quietly disagree — and where they still can, it is written
down in
Known limitations,
each backed by a test that fails the moment it stops being true.
The generator is a Rust extension that fills columns in parallel; validate()
compiles every check across every column into a single Polars aggregation, so
validating a wide table costs about the same as a narrow one. Numbers, and
comparisons to NumPy and hand-written fixtures, are in
Comparison.
Install
uv add polspec # preferred
pip install polspec # alternative
Wheels are published for Linux (x86_64, aarch64), macOS (Intel and Apple silicon) and Windows (x86_64), so using polspec needs no Rust toolchain. Building from a checkout is covered in CONTRIBUTING.md.
Documentation
Full docs: maxwellb13.github.io/polspec. Start with Getting started, find a task among the how-to guides, or look a name up in the API reference.
Development
Setting up a checkout, the checks CI runs, the conventions and the release process are in CONTRIBUTING.md; what changed is in CHANGELOG.md.
License
MIT.
1 maintainer
Metadata
1 maintainer
Release files for polspec 0.12.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| polspec-0.12.0.tar.gz | 671.2 kB | With provenance | Details |
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| polspec-0.12.0-cp312-abi3-win_amd64.whl | CPython 3.12 | abi3 | Windows x86-64 | Details |
| polspec-0.12.0-cp312-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl | CPython 3.12 | abi3 | Linux glibc 2.17+ x86-64 | Details |
| polspec-0.12.0-cp312-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl | CPython 3.12 | abi3 | Linux glibc 2.17+ ARM64 | Details |
| polspec-0.12.0-cp312-abi3-macosx_11_0_arm64.whl | CPython 3.12 | abi3 | macOS 11.0+ ARM64 | Details |
| polspec-0.12.0-cp312-abi3-macosx_10_12_x86_64.whl | CPython 3.12 | abi3 | macOS 10.12+ x86-64 | Details |
Total release size: 29.9 MB
Release files / polspec-0.12.0.tar.gz
| Download URL | polspec-0.12.0.tar.gz |
|---|---|
| Size | 671.2 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
fa600595912bfec0ebd53b0c0a2249ef0224f7fe18ce3270a7ac1d09561f7c85
|
|
BLAKE2b-256 checksum How to use checksums |
8f89f0405b173c5b042f33840d6873a069a0c28462dd8f058a336fcdf38bb6dc
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 26, 2026.
Transparency logRelease files / polspec-0.12.0-cp312-abi3-win_amd64.whl
| Download URL | polspec-0.12.0-cp312-abi3-win_amd64.whl |
|---|---|
| Size | 6.3 MB |
| Tags | CPython 3.12 Windows x86-64 abi3 |
|
SHA-256 checksum How to use checksums |
0f36d87b1f33661dbc9f09ca582720108ef735d44e8931f5cc2695fff4537cea
|
|
BLAKE2b-256 checksum How to use checksums |
78f650bf329e89bda536fbbb991f8d453e5c7f42c5e5cbfc4bc3a1364ac7d9a8
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 26, 2026.
Transparency logRelease files / polspec-0.12.0-cp312-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
| Download URL | polspec-0.12.0-cp312-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl |
|---|---|
| Size | 6.1 MB |
| Tags | CPython 3.12 Linux glibc 2.17+ x86-64 abi3 |
|
SHA-256 checksum How to use checksums |
3e0dc37cdd4b7827c2d811be03e8b39d7dbbba27f5ee14bfc1f380e3f64ceb1e
|
|
BLAKE2b-256 checksum How to use checksums |
71f5ccc392e5ba2687149c90bd043b4e827ee9b19785f76c2659366e4f5cc45c
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 26, 2026.
Transparency logRelease files / polspec-0.12.0-cp312-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
| Download URL | polspec-0.12.0-cp312-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl |
|---|---|
| Size | 5.6 MB |
| Tags | CPython 3.12 Linux glibc 2.17+ ARM64 abi3 |
|
SHA-256 checksum How to use checksums |
b102e9564b73467957b2af06cabba26d3c8da116eab627f27d1bb844fc814f76
|
|
BLAKE2b-256 checksum How to use checksums |
162e4354260f478497565caf7da981a9aff2e11c1d2ac9b35ba54d4aaca8b69d
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 26, 2026.
Transparency logRelease files / polspec-0.12.0-cp312-abi3-macosx_11_0_arm64.whl
| Download URL | polspec-0.12.0-cp312-abi3-macosx_11_0_arm64.whl |
|---|---|
| Size | 5.3 MB |
| Tags | CPython 3.12 abi3 macOS 11.0+ ARM64 |
|
SHA-256 checksum How to use checksums |
d1e3e88df3954fad7e264148d1e28253d75c95a8173d5a86915b3a0ff315ad01
|
|
BLAKE2b-256 checksum How to use checksums |
13ce7facb3b316e37796f32c5f84b395f7256e80c69890216e523c841eb6fac9
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 26, 2026.
Transparency logRelease files / polspec-0.12.0-cp312-abi3-macosx_10_12_x86_64.whl
| Download URL | polspec-0.12.0-cp312-abi3-macosx_10_12_x86_64.whl |
|---|---|
| Size | 6.0 MB |
| Tags | CPython 3.12 abi3 macOS 10.12+ x86-64 |
|
SHA-256 checksum How to use checksums |
fb5ce76c2e824f7f5411e06ebf2776d308013a79ec98452f2765d6f193bc10de
|
|
BLAKE2b-256 checksum How to use checksums |
46b668d9d5b9fb50b598e283245576d125a760f0ad7e37773b25f3bfbd0e047f
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 26, 2026.
Transparency logSecurity for polspec 0.12.0
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
Full provenance
All 6 files in this release have been uploaded with provenance metadata.
Attestation for polspec-0.12.0.tar.gz
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 26, 2026.
Transparency logA note on package security
PyPI is a repository for distributing packages, not a service for auditing them. While third-party security researchers and our staff do their best to detect and remove malicious packages, PyPI cannot guarantee the quality, security or suitability of any given package.
