贪吃蛇（源码）

# 在这里写上你的代码 :-)
import turtle
from random import randrange
import copy
turtle.hideturtle()
turtle.setup(500,500)
food = [-10,0]
def square(X,Y,name):
    turtle.up()
    turtle.goto(X,Y)
    turtle.down()
    turtle.color(name)
    for i in range(4):
        turtle.fd(10)
        turtle.rt(90)
snake = [[0,0],[0,10],[0,20],[0,30],[0,40]]
aim = [0,10]

def change_direction(x,y):
    aim[0] = x
    aim[1] = y
def inside(head):
    return - 250 < head[0] < 250 and -250 < head[1] < 250
def snake_move():
    head = copy.deepcopy(snake[-1])
    head = [head[0] + aim[0], head[1]+ aim[1]]
    if head in snake or not inside(head):
        square(head[0],head[1],'green')
    if head == food:
       food[0] = randrange(-15,15) * 10
       food[1] = randrange(-15,15) * 10
    else:
        snake.pop(0)
    snake.append(head)
    turtle.clear()
    square(food[0],food[1],'blue')
    for body in snake:
        square(body[0],body[1],'red')
    turtle.update()
    turtle.ontimer(snake_move, 300)
turtle.tracer(False)
turtle.listen()
turtle.onkey(lambda:change_direction(0,10),'Up')
turtle.onkey(lambda:change_direction(0,-10),'Down')
turtle.onkey(lambda:change_direction(10,0),'Right')
turtle.onkey(lambda:change_direction(-10,0),'Left')
snake_move()