How to use radon with pre-commit?

Just add the following to your .pre-commit-config.yaml:

repos:
  - repo: https://github.com/kalaverin/radon
    rev: 0.2.1
    hooks:
      - id: radon
        args: [--warn-time=120, --error-effort=2000]

Read more about Radon and used Halstead metrics implementation.

You can configure these thresholds:

--warn-difficulty WARN_DIFFICULTY
--warn-effort WARN_EFFORT
--warn-time WARN_TIME
--warn-volume WARN_VOLUME
--warn-complexity WARN_COMPLEXITY
--error-difficulty ERROR_DIFFICULTY
--error-effort ERROR_EFFORT
--error-time ERROR_TIME
--error-volume ERROR_VOLUME
--error-complexity ERROR_COMPLEXITY

Example of real output: