Click

Click is a Python package that simplifies creating composable, production-ready command line interfaces with minimal decorator-based code.

Writing command line tools in Python often gets bogged down in boilerplate argument parsing. Click solves this by using clean Python decorators (like @click.command and @click.option) to bind CLI logic directly to your functions. It handles the heavy lifting out of the box: it automatically generates clean help pages, enforces strict type validation, and supports nested command groups. Whether you are building a simple utility or a complex developer tool, Click keeps your codebase modular and your terminal interface highly intuitive.

https://click.palletsprojects.com