# Utilities

- `tornado.autoreload` — Automatically detect code changes in development
- `tornado.log` — Logging support
- `tornado.options` — Command-line parsing
  - Global functions
  - OptionParser class
- `tornado.stack_context` — Exception handling across asynchronous callbacks
- `tornado.testing` — Unit testing support for asynchronous code
  - Asynchronous test cases
  - Controlling log output
  - Test runner
  - Helper functions
- `tornado.util` — General-purpose utilities