# Complete behavior [Back to Python](https://rustic-game-engine.pages.dev/markdown/scripting/python.md). Complete the [setup and attachment steps](https://rustic-game-engine.pages.dev/markdown/scripting/python/setup-and-attachment.md), then paste this behavior into the attached script. ```py from rustic import rustic, instance, Game, run def on_start(): rustic.log("info", "Behavior started") def fixed_update(dt): x, y, z = rustic.get_translation() if rustic.key("KeyW")["held"]: rustic.set_translation(x, y, z + dt) run(globals()) ``` The SDK is staged automatically beside the source in an engine temporary directory. You do not install a package, copy the SDK into your game, or write a process loop. **Programming > Open Programming Workspace** also writes editor support files under `.rustic/generated/programming`. Regenerate those files after upgrading Rustic. Edit your behavior source, not generated SDK files. Run through Rustic Play so the engine can supply the API and callback state.