Python Language Support - Qlty Docs

Summary

Feature	Status	Notes
Maintainability	✔	Complexity, duplication, code smells
Linting	✔
Auto-formatting	✔
Custom checks	✔
Security scanning	✔	AppSec, dependencies, and secrets
Code metrics	✔
Code coverage	✔

Details

Maintainability
Complexity	✔	Aka cognitive complexity
Cyclomatic complexity	✔
Identical code duplication	✔
Similar code duplication	✔
Code smells	✔
Linters
Flake8	✔	Style guide enforcement
Mypy	✔	Static type checker
Ruff	✔	Fast Python linter
Bandit	✔	Security linter
radarlint-python	✔	Static analysis tool
Auto-formatters
Black	✔	Code formatter
Ruff	✔	Includes formatting capabilities
Custom checks
ast-grep	✔
Semgrep	✔
ripgrep	✔
Security scanning
Bandit	✔	AppSec (SAST)
Gitleaks	✔	Secrets scanning
OSV-Scanner	✔	Dependency scanning (SCA)
radarlint-python	✔	AppSec (SAST)
Semgrep	✔	AppSec (SAST)
Trivy	✔	Dependency scanning (SCA)
TruffleHog	✔	Secrets scanning
Code coverage
pytest	✔
unittest	✔
Cobertura coverage format	✔
Coverage.py XML format	✔

File extensions

By default, Python files are defined as:

[file_types.python]
globs = [
  "*.py",
  "*.pyw",
  "**/DEPS",
  "**/Snakefile",
  "**/SConscript",
  "**/wscript",
  "**/SConstruct",
  "**/.gclient",
]
interpreters = ["python", "python3", "python2", "pypy"]

These patterns can be overridden from qlty.toml.

Supported Python versions

We support Python 2 and Python 3 for maintainability checks and code coverage. Each plugin may have its own version requirements.