beanz Magazine

Remote Controlled Turtles

Vicki Burton on Flickr

Some fun Python code that introduces you to the arcane world of event handling.

What do all games have in common? Control, of course! It’s the player who decides where to explore, who to battle, and when to run away. These choices require an input mechanism. Whether you’re using a video game controller, a touch screen, or a keyboard, the game’s software needs to detect user inputs and respond to them appropriately. In software, we call this event handling.

Though user-generated events are fundamental to all games, the code associated with them can be a bit tricky. But fear not! We’re here to demystify the process, using a short Python program with a Turtle sprite that responds to key presses.

To start, navigate to www.repl.it and select ‘Python with Turtle’ from the ‘Select your Language’ box.

Setup

Add the following code to the left-hand editor:

from turtle import Turtle, Screen

playground = Screen()
thomas = Turtle()
thomas.shape('turtle')
thomas.penup()

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