Ruff Professional Development

Version: 0.14.10 (Documentation generated December 2025)

Overview

Ruff is an extremely fast Python linter and formatter written in Rust. It combines the functionality of multiple Python tools (Flake8, isort, Black, pyupgrade, and more) into a single high-performance tool.

This skill provides comprehensive guidance for:

• •Configuring and integrating Ruff into Python projects
• •Understanding and fixing lint rule violations
• •Formatting Python code with Ruff's formatter
• •Setting up editor integrations
• •Migrating from other Python tooling

Quick Start

Installation

See references/installation.md for complete installation instructions across all platforms and package managers.

Basic Usage

Linting:

ruff check .                    # Lint all files
ruff check path/to/file.py      # Lint specific file
ruff check --fix .              # Auto-fix violations

Formatting:

ruff format .                   # Format all files
ruff format path/to/file.py     # Format specific file
ruff format --check .           # Check formatting without changes

Configuration:

# pyproject.toml or ruff.toml
[tool.ruff]
line-length = 88
target-version = "py311"

[tool.ruff.lint]
select = ["E", "F", "I"]
ignore = ["E501"]

See references/configuration.md for comprehensive configuration options.

Core Workflows

1. Integrating Ruff into a Project

Steps:

1. •Install Ruff (see references/installation.md)
2. •Create initial configuration (see references/configuration.md)
3. •Run initial check: ruff check .
4. •Review and configure rules (see references/settings.md)
5. •Set up pre-commit hooks or CI integration (see references/integrations.md)

2. Fixing Lint Violations

Process:

1. •Run ruff check . to identify violations
2. •For specific rule violations, reference references/rules/<rule-name>.md
3. •Apply automatic fixes: ruff check --fix .
4. •Manual fixes for remaining violations using rule documentation

Finding Rule Documentation:

• •All 937 rules are in references/rules/
• •Rules are named by their description (e.g., unused-import.md, line-too-long.md)
• •See references/rules/rules.md for complete rule index

3. Code Formatting

Workflow:

1. •Review formatter overview: references/formatter/overview.md
2. •Configure formatter settings in pyproject.toml
3. •Run formatter: ruff format .
4. •For Black compatibility: see references/formatter/black.md

4. Editor Integration

Setup:

1. •Review references/editors/overview.md for editor support
2. •Follow setup instructions: references/editors/setup.md
3. •Configure editor settings: references/editors/settings.md
4. •Explore editor features: references/editors/features.md

5. Migrating from Other Tools

Migration paths:

• •From Black: See references/formatter/black.md
• •From Flake8/isort/pyupgrade: See references/configuration.md for rule equivalents
• •General migration: See references/tutorial.md for migration guidance

Documentation Organization

This skill includes comprehensive reference documentation organized for efficient access:

Navigation Guide: references/INDEX.md - Complete index of all documentation with use-case based navigation

Core Documentation:

• •configuration.md - Complete configuration reference
• •settings.md - All available settings and options
• •linter.md - Linter functionality and configuration
• •tutorial.md - Comprehensive getting started guide

Formatter:

• •formatter/overview.md - Formatter basics
• •formatter/black.md - Black compatibility

Rules (937 total):

• •rules/rules.md - Rules overview and index
• •rules/<rule-name>.md - Individual rule documentation

Editor Integration:

• •editors/overview.md - Editor support overview
• •editors/setup.md - Installation instructions
• •editors/features.md - Available features
• •editors/settings.md - Configuration options

Other Resources:

• •installation.md - Installation guide
• •integrations.md - CI/CD and tool integrations
• •versioning.md - Versioning and compatibility
• •preview.md - Preview features
• •faq.md - Frequently asked questions
• •contributing.md - Contributing to Ruff

Finding Specific Information

For configuration questions:

1. •Start with references/settings.md for all available options
2. •Review references/configuration.md for configuration patterns
3. •Check references/linter.md or references/formatter/overview.md for component-specific settings

For rule violations:

1. •Note the rule code/name from error message
2. •Find corresponding file in references/rules/
3. •Rules are alphabetically named (e.g., E501 → line-too-long.md)

For editor setup:

1. •Check references/editors/overview.md for supported editors
2. •Follow references/editors/setup.md for your editor
3. •Configure with references/editors/settings.md

For tool migration:

1. •Review references/tutorial.md for general guidance
2. •See references/formatter/black.md for Black-specific migration
3. •Check references/configuration.md for rule mapping from other linters

Included Scripts

This skill includes Python scripts for updating documentation (located in scripts/):

• •scrape_ruff_docs.py - Scrape a single Ruff documentation page
• •discover_ruff_docs.py - Discover all Ruff documentation URLs
• •bulk_scrape_ruff.py - Bulk scrape all Ruff documentation

These scripts use cloudscraper, BeautifulSoup, and markdownify to fetch and convert Ruff documentation.

Best Practices

When configuring Ruff:

• •Start with defaults and incrementally add rules
• •Use select to enable rule categories, ignore for exceptions
• •Test configuration changes incrementally
• •Document reasoning for ignored rules in comments

When fixing violations:

• •Review auto-fixes before committing
• •Understand the rule before ignoring it
• •Use inline ignores (# noqa) sparingly
• •Consider if the rule should be disabled project-wide

When formatting:

• •Run formatter before linter to avoid conflicts
• •Configure line length consistently across tools
• •Use --check in CI to verify formatting
• •Format entire codebase at once when first adopting

When integrating:

• •Set up editor integration for immediate feedback
• •Add pre-commit hooks for team consistency
• •Include in CI pipeline with appropriate settings
• •Document Ruff configuration in project README

Advanced Usage

Performance optimization:

• •Use --cache-dir for faster repeated runs
• •Configure file exclusions to skip irrelevant paths
• •Leverage parallel execution (default behavior)

Preview features:

• •See references/preview.md for experimental features
• •Enable with preview = true in configuration
• •Test preview rules before enabling in production

Custom rule selection:

• •Combine rule categories: select = ["E", "F", "I", "N"]
• •Use per-file ignores for specific patterns
• •Configure different rules for different directories

Documentation Coverage

This skill provides complete coverage of Ruff v0.14.10:

• •937 individual rule documentation files
• •Full configuration and settings reference
• •Complete editor integration guides
• •Formatter documentation including Black compatibility
• •Installation, integration, and migration guides
• •FAQ and troubleshooting resources

All documentation is current as of December 2025 and reflects the latest stable release (0.14.10).