Appendix A: Python Recipes
The following recipes provide the program code for Example 3 and Example 4 in Chapter 11, “An Introduction to Python”, and a sample solution for the combined input-output program suggested in Chapter 12, “Hardware Hacking”. Each recipe is also available for download from the Raspberry Pi User Guide website at
http://www.wiley.com/go/raspberrypiuserguide. If you’re typing the code in by hand, look out for the symbol: this indicates that the line is wrapped due to space constraints in the book. If you see the symbol at the end of a line, don’t press Enter until you reach the end that doesn’t have a symbol present.
Raspberry Snake (Chapter 11, Example 3)
# Raspberry Snake
# Written by Gareth Halfacree for the Raspberry Pi User Guide
import pygame, sys, time, random
from pygame.locals import *
fpsClock = pygame.time.Clock()
playSurface = pygame.display.set_mode((640, 480))
redColour = pygame.Color(255, 0, 0)
blackColour = pygame.Color(0, 0, 0)
whiteColour = pygame.Color(255, 255, 255)
greyColour = pygame.Color(150, 150, 150)
snakePosition = [100,100]
snakeSegments = [[100,100],[80,100],[60,100]]
raspberryPosition = [300,300]
raspberrySpawned = 1
direction = ‘right’
changeDirection = direction
gameOverFont = pygame.font.Font(‘freesansbold.ttf’, 72) ...
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