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welcome to click click documentation 8 5 x navigation index next click documentation 8 5 x welcome to click welcome to click click is a python package for creating beautiful command line interfaces in a composable way with as little code as necessary it s the command line interface creation kit it s highly configurable but comes with sensible defaults out of the box it aims to make the process of writing command line tools quick and fun while also preventing any frustration caused by the inability to implement an intended cli api click in three points arbitrary nesting of commands automatic help page generation supports lazy loading of subcommands at runtime what does it look like here is an example of a simple click program import click click command click option count default 1 help number of greetings click option name prompt your name help the person to greet def hello count name simple program that greets name for a total of count times for x in range count click echo f hello name if __name__ __main__ hello and what it looks like when run python hello py count 3 your name john hello john hello john hello john it automatically generates nicely formatted help pages python hello py help usage hello py options simple program that greets name for a total of count times options count integer number of greetings name text the person to greet help show this message and exit you can get the library directly from pypi pip install click documentation frequently asked questions general tutorials quickstart virtualenv how to guides packaging entry points setuptools integration standalone application with briefcase upgrade guides supporting multiple versions conceptual guides cli design opinions why click click concepts general reference parameters parameter types options options shortcut decorators arguments basic commands groups context advanced groups and context help pages user input prompts handling files advanced patterns complex applications extending click testing click applications utilities shell completion exception handling and exit codes general command line topics unicode support windows console notes api reference api decorators utilities commands parameters context types exceptions formatting parsing shell completion testing about project this documentation is structured according to diataxis and written with myst version policy donate contributing click contrib bsd 3 clause license changes project links donate pypi releases source code issue tracker chat contents welcome to click documentation tutorials how to guides conceptual guides general reference api reference about project quick search copyright 2014 pallets created using sphinx 9 1 0