Black code tool

The Black code tool formats Python source to a consistent style, applying Black rules across files to produce deterministic formatting outputs. Conceptually, it parses input code, applies stylistic rules, and outputs both a formatted version and a unified diff for review. It targets Python projects and is useful for developers, code reviewers, and CI engineers who want rapid, reproducible formatting without altering program logic.
The tool supports configurable line length and target Python version, enabling alignment with project-specific conventions. It can process single snippets or batched inputs, returning per-file results and a patch when multiple files are involved. Outputs include the formatted code, a diff, and metadata such as changed line counts and processing time, suitable for automated checks and human review.
Unlike full linters, this tool focuses on layout, consistency, and move-fast formatting decisions, reducing back-and-forth in PRs while preserving semantics. It is designed to integrate with pre-commit hooks and CI workflows, delivering deterministic results that help teams enforce a shared style and accelerate code reviews. The core differentiator is the combination of a Black-compatible formatter, diff generation, and flexible configuration without requiring a local tool installation, making it accessible to diverse development environments.