Cloup

Cloup — originally from 'Click + option groups' — enriches the popular Click library with several features that make command-line interfaces more expressive and configurable. These include option groups, constraints (e.g., mutually exclusive parameters), subcommand aliases, subcommand sections, and a themeable help formatter. The library, currently at version 3.0.9, is under active development, statically type-checked with MyPy, and extensively tested.