snake_game.py

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):
    aim.x=x
    aim.y=y

def inside(head):
    return -200 < head.x < 190 and -200 < head.y < 190

def move():
    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()

    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,"green")

    square(food.x,food,y,9,"red")
    update()
    ontimer(move,100)

    hideturtle()
    tracer(false)
    listen()
    onkey(lambda:changes(10,0),"Right")
    onkey(lambda:changes(-10,0),"Left")
    onkey(lambda:changes(0,10),"Up")
    onkey(lambda:changes(0,-10),"Down")

    move()
    done()