To use steamleaderboards as a standalone application, first install it via PyPI:

$ # Using pipx
$ pipx install steamleaderboards

Then, you can use it to retrieve leaderboards for one or more Steam games via the terminal:

$ steamleaderboards --output_dir="./data" 440

This will download all leaderboards for Team Fortress 2, the game with the app id 440, to the ./data directory.

App ids for games can be found via SteamDB.