snake_game.py

from turtle import *
import random
from freegames import square, vector

food = vector(0,0)
snake = [ vector(10,10)]
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 head in snake or not inside(head):
        square(head.x,head.y,9,'red')
        update()
        return
    
    snake.append(head)

    if head == food:
        print('snake:', len(snake))
        food.x = random.randrange(-15,15)*10
        food.y = random.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,100)
        



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()