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python-analyzer

Testing & Quality
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Format and analyze Python code using ruff (formatting/linting) and ty (static type checking). Use when the user asks to format Python code, run linting, check types, fix code style issues, or analyze Python code quality.

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Python Code Analyzer

Format and analyze Python code using ruff and ty.

Tools

  • ruff: Fast Python linter and formatter (replaces black, isort, flake8)
  • ty: Static type checker for Python

Workflow

1. Format Code

Format Python files with ruff:

# Format single file
ruff format path/to/file.py

# Format directory
ruff format .

# Check formatting without applying changes
ruff format --check .

2. Lint Code

Run linter to find issues:

# Lint and show issues
ruff check .

# Auto-fix fixable issues
ruff check --fix .

# Show all fixable issues
ruff check --fix --unsafe-fixes .

3. Type Check

Run static type analysis with ty:

# Check types in current directory
ty check .

# Check specific file
ty check path/to/file.py

Full Analysis Command

Run complete analysis (format + lint + type check):

ruff format . && ruff check --fix . && ty check .

Common Issues and Fixes

Ruff

  • Import sorting: Auto-fixed with ruff check --fix
  • Unused imports: Auto-fixed with ruff check --fix
  • Line length: Configure in pyproject.toml under [tool.ruff]

Ty

  • Missing type annotations: Add type hints to function signatures
  • Type mismatches: Review and correct variable/return types
  • Import errors: Ensure all dependencies are installed

Configuration

Both tools read from pyproject.toml:

[tool.ruff]
line-length = 88
target-version = "py311"

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

[tool.ty]
python-version = "3.11"