game

#!/usr/bin/env python
import pygame
import field
import food
import snake

blockSize = 10 # size of blocks
width = 20 # size of field width in blocks
height = 20
screenSize = (width * blockSize, height * blockSize)
speed = 500 # milliseconds per step

# Initialize pygame and open a window
pygame.init()
screen = pygame.display.set_mode(screenSize)

# Create the field, the snake and a bit of food
theField = field.Field(screen, width, height, blockSize)
theFood = food.Food(theField)
theSnake = snake.Snake(theField)

pygame.time.set_timer(pygame.USEREVENT, speed)

dx = 1
dy = 0

def updateScreen():
    theField.draw()
    theFood.draw()
    theSnake.draw()
    pygame.display.update()

updateScreen()

while True:
    event = pygame.event.wait()

    if event.type == pygame.QUIT: # window closed
        pygame.quit()
        sys.exit()

    if event.type == pygame.USEREVENT: # timer elapsed
        if not theSnake.move(dx, dy):
            break

        if theSnake.body[0] == (theFood.x, theFood.y):
            theSnake.grow()
            speed -= 5
            theFood = food.Food(theField) # make a new piece of food

        updateScreen()

    if event.type == pygame.KEYDOWN: # key pressed
        if event.key == pygame.K_LEFT:
            dx = -1
            dy = 0
        elif event.key == pygame.K_RIGHT:
            dx = 1
            dy = 0
        elif event.key == pygame.K_DOWN:
            dx = 0
            dy = 1
        elif event.key == pygame.K_UP:
            dx = 0
            dy = -1

# Game over!
for i in range(0, 10):
    theField.draw()
    theFood.draw()
    theSnake.draw(damage = (i % 2 == 0))
    pygame.display.update()
    pygame.time.wait(100)