dpcs 0.12.0

Python bindings for the Data Pipeline Contract Standard (DPCS) reference toolkit

dpcs (Python)

Python bindings for the Data Pipeline Contract Standard (DPCS) Rust reference toolkit. Parse, validate, plan, compare, and bind pipeline contracts from Python via PyO3.

Package	dpcs on PyPI
Toolkit	0.11.x (ROADMAP developer-experience release)
Spec	1.0.0-draft
Requires	Python ≥ 3.9 (abi3)
Guides	dpcs.readthedocs.io
Bindings notes	docs/BINDINGS.md

Install

pip install dpcs

Quick start

from pathlib import Path

import dpcs

source = Path("pipeline.dpcs.yaml").read_text()
report = dpcs.validate_yaml(source)

errors = [d for d in report["diagnostics"] if d.get("severity") == "error"]
assert not errors, errors

print(dpcs.version(), dpcs.dpcs_spec_version())
# or from a path (YAML or JSON):
# report = dpcs.validate_file("pipeline.dpcs.yaml")

API

Functions return JSON-compatible dict / list values (serialized from the Rust types) unless noted.

Function	Purpose
version() / __version__	Toolkit version string
dpcs_spec_version()	Spec version (1.0.0-draft)
parse_yaml_str(source) / parse_json_str(source)	Parse a contract document
validate_yaml(source) / validate_file(path)	Validate YAML/JSON (file auto-detects)
plan_yaml(source)	Build a pipeline plan (or validation report on refusal)
evaluate_capabilities(profile_yaml, contract_yaml)	Check orchestrator capabilities
bind_yaml(contract_yaml, profile_yaml, target)	Emit scaffolding (airflow, dagster, prefect, temporal, kubernetes, …)
compare_contract_yaml(baseline, candidate)	Compatibility comparison
validate_registry_yaml(source)	Validate an artifact registry document
validate_conformance_profile_yaml(source)	Validate a conformance profile
to_yaml_str(contract_json) / to_json_str(contract_yaml)	Format conversion

CLI, report formats, and TUI are Rust-first (dpcs-cli); this package wraps the core library entry points. Full toolkit docs: dpcs.readthedocs.io.

Develop from source

Requires a virtualenv for maturin develop. The Python crate sits outside the Cargo workspace (workspace.exclude).

cd bindings/python
python -m venv .venv && source .venv/bin/activate
pip install maturin pytest
maturin develop
pytest -q

License

Apache-2.0 OR MIT — same as the main dpcs repository.