pyCLI is a Python library that provides a simple and easy-to-use interface for building command-line interfaces (CLIs) for Python applications. It is built on top of the popular Python argparse library and provides a number of additional features and conveniences to make it easier to create robust and user-friendly command-line interfaces.

One of the key features of pyCLI is its simplicity. It provides a high-level API that allows developers to create CLIs quickly and easily, without having to worry about the low-level details of parsing command-line arguments or handling errors. For example, pyCLI provides a Command class that can be used to define individual commands for the CLI, along with their arguments and options. Developers can then use the run() method of the Command class to execute the command, passing in any necessary arguments or options.

Another important feature of pyCLI is its support for subcommands. This allows developers to create complex CLIs with multiple levels of commands and options, making it easy for users to navigate and discover the functionality provided by the application. Subcommands can be defined using the Command.add_subcommand() method, which allows developers to define a new command as a child of an existing command.

Finally, pyCLI provides a number of additional conveniences that make it easier to create user-friendly CLIs. For example, it provides built-in support for help messages and error handling, and allows developers to define custom types for command-line arguments, making it easy to handle complex data structures. Overall, pyCLI is a powerful and flexible library that can be used to create command-line interfaces for a wide range of Python applications.