python贪吃蛇

class point:
    row=0
    col=0
    def __init__(self,row,col):
        self.row=row
        self.col=col
    def copy(self):
        return point(row=self.row,col=self.col)
#初始化框架
import pygame
import random
pygame.init()
width=800
height=600
ROW=30
COL=40
size=(width,height)
window=pygame.display.set_mode(size)
pygame.display.set_caption(‘mlhj‘)
head=point(row=random.randint(0,ROW-1),col=random.randint(0,COL-1))
food=point(row=random.randint(0,ROW-1),col=random.randint(0,COL-1))
quit=True
clock =pygame.time.Clock()
back_color=(255,255,255)
head_color=(255,0,0)
snake_color=(128,128,128)
food_color=(0,128,128)
snakes=[]
def rect(point,color):
    cell_width=width/COL
    cell_height=height/ROW
    left=point.col*(cell_width)
    top=point.row*(cell_height)
    pygame.draw.rect(window, color, (left, top, cell_width, cell_height))
    pass
dir=‘left‘
while quit:
    for event in pygame.event.get():
        print(event)
        if event.type==pygame.QUIT:
            quit = False
        elif event.type==pygame.KEYDOWN:
            if event.key==273:
                if dir==‘left‘ or dir==‘right‘:
                    dir=‘up‘
            elif event.key==274:
                if dir == ‘left‘ or dir == ‘right‘:
                    dir=‘down‘
            elif event.key == 275:
                if dir == ‘up‘ or dir == ‘down‘:
                    dir = ‘right‘
            elif event.key == 276:
                if dir == ‘up‘ or dir == ‘down‘:
                    dir = ‘left‘
    eat = (head.row==food.row and head.col==food.col)
    snakes.insert(0,point.copy(head))
    if not eat:                    #如果没吃到，移动的时候就把尾巴给‘扔了’，如果迟到了食物，则会增加一节，这一节刚好就是需要pop的那一个位置
        snakes.pop()
    if eat:
        food = point(row=random.randint(0, ROW - 1), col=random.randint(0, COL - 1))
        #碰到边界死亡
    if head.col>40 or head.row<0 or head.row>30or head.col<0:
        quit=False
        #碰到自己的身体死亡
    for snake in snakes:
        if snake.row==head.row and snake.col==head.col:
            quit=False
    if dir==‘left‘:
        head.col-=1
    elif dir==‘right‘:
        head.col+=1
    elif dir==‘up‘:
        head.row-=1
    elif dir == ‘down‘:
        head.row += 1
    #渲染，将舌头蛇身食物等在界面上画出来
    pygame.display.flip()
    pygame.draw.rect(window,back_color,(0,0,width,height))
    rect(head,head_color)
    rect(food,food_color)
    for snake in snakes:
        rect(snake,snake_color)



#设置帧频
    clock.tick(10)