Do we need to install anything besides Rich to build this CLI?

No. argparse is part of the Python standard library, so it ships with every Python install and needs no pip command. Rich is the only package to install, with pip install rich. The JSON storage also uses the standard library. We ran the tutorial with Python 3.12.3 and Rich 15.0.0.

How do we add a new command to the task manager?

We add one subparser in build_parser, give it its own arguments, and attach a handler with set_defaults(func=...). Then we write the handler function, which loads the tasks, changes them and saves the file. The new command appears in the help text automatically, with no other file to update.

Where are the tasks stored, and can we read the file ourselves?

Tasks live in tasks.json, in the same folder as tasks.py. Each task is one JSON object with an id, a title, a priority and a done flag. The file is plain text, so we can open it in any editor to check the state or fix a mistake by hand.

Can we run this tool on another machine?

Yes. We copy tasks.py to the other machine, install Rich with pip install rich, and run it with Python 3.12 or newer. The tasks.json file starts empty on first run, so the tool works straight away. We can also copy tasks.json across to bring our existing tasks with us.

Build a CLI Task Manager in Python with argparse and Rich