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Python development tooling configuration and best practices for ruff, mypy, pytest, pyscn, and uv. Use when setting up a Python project, configuring linters, formatters, type checkers, or test frameworks, or when editing pyproject.toml or tool config files.
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Python coding standards and best practices covering error handling, performance optimization, async patterns, SOLID design principles, documentation, data validation, and object-oriented programming. Use when writing, reviewing, or refactoring Python code, or when the user asks about Python style, design, or best practices.
Python test-writing best practices covering test structure, fixtures, parametrization, and mocking with pytest. Use when writing, reviewing, or refactoring tests, adding test coverage, or working in tests directories and conftest.py.
| name | tooling |
| description | Python development tooling configuration and best practices for ruff, mypy, pytest, pyscn, and uv. Use when setting up a Python project, configuring linters, formatters, type checkers, or test frameworks, or when editing pyproject.toml or tool config files. |
| paths | ["**/*.py","pyproject.toml","mypy.ini","ruff.toml"] |
A comprehensive guide to Python development tools. Configuration best practices for analysis, linters, type checkers, formatters, test frameworks, and package managers.
To write high-quality Python code, we recommend adopting these tools:
Integrating these into CI/CD reduces code review burden and maintains consistent quality.
Structural code analysis for quality assessment.
| Rule | Description |
|---|---|
| analysis-pyscn | Dead code, clones, dependencies, complexity with pyscn |
Static code analysis with ruff for consistent, high-quality code.
| Rule | Description |
|---|---|
| lint-ruff | Fast, comprehensive linting with ruff |
Static type checking with mypy for type safety and better IDE support.
| Rule | Description |
|---|---|
| type-mypy | Static type checking with mypy |
Consistent code formatting with ruff format and import sorting.
| Rule | Description |
|---|---|
| fmt-ruff | Code formatting and import sorting with ruff |
Test framework configuration with pytest for reliable testing.
| Rule | Description |
|---|---|
| test-pytest | Testing with pytest, fixtures, and coverage |
Modern Python packaging with uv and pyproject.toml.
| Rule | Description |
|---|---|
| pkg-uv | Fast package management with uv |
| pkg-pyproject | Project configuration with pyproject.toml |
[project]
name = "myproject"
version = "0.1.0"
requires-python = ">=3.11"
dependencies = []
[project.optional-dependencies]
dev = ["ruff", "mypy", "pytest", "pytest-cov", "pyscn"]
[tool.ruff]
target-version = "py311"
line-length = 88
[tool.ruff.lint]
select = ["E", "F", "W", "I", "UP", "B", "BLE", "SIM", "PTH", "S110", "S112"]
[tool.ruff.lint.flake8-bandit]
check-typed-exception = true
[tool.mypy]
python_version = "3.11"
strict = true
[tool.pytest.ini_options]
testpaths = ["tests"]
addopts = ["-v", "--tb=short"]
[tool.pyscn]
max_complexity = 15
# Analysis
pyscn analyze . # Full quality analysis
pyscn check . # CI quality gate
# Linting
ruff check . # Check for issues
ruff check . --fix # Auto-fix issues
# Formatting
ruff format . # Format code
# Type checking
mypy . # Type check
# Testing
pytest # Run tests
pytest --cov=src # With coverage
# Package management (uv)
uv pip install -e ".[dev]" # Install with dev deps
uv pip compile pyproject.toml -o requirements.lock