贪吃蛇

from random import randrange
from freegames import square, vector

food = vector(0,0)
snake = [vector(10,0)]
aim = vector(0,10)

def change(x,y):
    "Change snake direction"
    aim.x = x
    aim.y = y

def inside(head):
    "Return True if head inside boundaries"
    return -200 < head.x < 190 and -200 < head.y < 200

def move():
    "Move snake forward one segment."
    head = snake[-1].copy()
    head.move(aim)

    if not inside(head) or head in snake:
        square(head.x, head.y, 9, 'red')
        update()
        return

    snake.append(head)

    if head == food:
        print('Snake:', len(snake))
        food.x = randrange(-15, 15) * 10
        food.y = randrange(-15, 15) * 10
    else:
        snake.pop(0)

    clear()

    for body in snake:
        square(body.x, body.y, 9, 'black')

    square(food.x, food.y, 9, 'green')
    update()
    ontimer(move, 300)

def main():
    setup(420, 420, 370, 0)
    hideturtle()
    tracer(False)
    listen()
    onkey(lambda : change(10, 0), 'Right')
    onkey(lambda: change(-10, 0), 'Left')
    onkey(lambda: change(0, 10), 'Up')
    onkey(lambda: change(0, -10), 'Down')
    move()
    done()

main()