Hỏi về code snake trong pygame và giúp sửa code

Em mới tập tành viết game snake bằng pygame, code em viết như sau:

import pygame,sys,random
from pygame.locals import *

winwidth = 500
winheight = 500
FPS = 30
clock = pygame.time.Clock()

pygame.init()
win = pygame.display.set_mode((winwidth,winheight))
pygame.display.set_caption("Snake_Game")

block_size = 25
assert winwidth%block_size == 0 and winheight%block_size == 0,"AttentionError"

Loserfont = pygame.font.SysFont("c",100)
Loserfont = Loserfont.render("You have run out of the edge",1,(192,192,192))
Loserfont_x = winwidth //4
Loserfont_y = winheight//4

food_x = random.randint(1,(winwidth-block_size)//block_size+1)
food_y = random.randint(1,(winheight-block_size)//block_size+1)

def food(food_x,food_y):
       return food_x == random.randint(1,(winwidth-block_size)//block_size+1) and food_y == random.randint(1,(winheight-block_size)//block_size+1)

def Grid():
    for x in range(winwindth):
         for y in range(winheight):
               pygame.draw.rect(win,(255,0,0),(x*block_size,y*block_size,block_size,block_size),2)

class Snake():
    def __init__(self):
        self.width = block_size
        self.height = block_size
        self.body = [[winwidth//2,winheight//2],[winwidth//2+block_size,winheight//2], 
                                                   [winwidth//2+2*block_size,winheight//2]]
        self.new_head = []
         self.tail = []
     def draw(self):
    
            HEAD = 0
            x = 0
            y = 1
        while True:
            for event in pygame.event.get():
                if event.type == QUIT:
                        pygame.quit()
                if event.type == K_UP and self.direction != "DOWN":
                        self.direction == "UP"
                elif event.type == K_DOWN and self.direction != "UP":
                        self.direction == "DOWN"
                elif event.type == K_RIGHT and self.direction != "LEFT":
                        self.direction == "RIGHT"
               elif event.type == K_LEFT and self.direction != "RIGHT":
                        self.direction == "LEFT"
     
        #If the snake touch the edge
           if self.body[HEAD][x] < 0 or self.body[HEAD][x] > winwidth or self.body[HEAD][y]< 0 or self.body[HEAD][y] > winheight:
                   return

        #If the snake touch his self's body
           for body in self.body[1:]:
                if body[x] == self.body[HEAD][x] and body[y] == self.body[HEAD][y]:
                     return     

        #If the snake eat the food
             if self.body[HEAD][x] == food_x and self.body[HEAD][y] == food_y:
                 food(food_x,food_y)

          pygame.draw.rect(win,(255,0,0),(food_x*block_size,food_y*block_size,block_size,block_size))
        
           self.direction = ""
            if self.direction == "UP":
                    self.new_head = [self.body[HEAD][x],self.body[HEAD][y] - block_size]
            elif self.direction == "DOWN":
                    self.new_head = [self.body[HEAD][x],self.body[HEAD][y] + block_size]
            elif self.direction == "LEFT":
                    self.new_head = [self.body[HEAD][x] - block_size, self.body[HEAD][y]]
            elif self.direction == "RIGHT":
                    self.new_head = [self.body[HEAD][x] + block_size,  self.body[HEAD][y]]

             self.body.insert(0,self.new_head)
             self.body.pop()

              body = 0
             while body<len(self.body):
                 pygame.draw.rect(win,(255,0,0),(self.body[body][x],self.body[body][y],block_size,block_size))
                 pygame.draw.rect(win,(0,0,0),(self.body[body][x]+5,self.body[body][y]+5,block_size,block_size),2)
                 body += 1

              Grid()
              pygame.display.update()
       
        snake = Snake()

 if __name__ == "__main__":
         while True:
              snake.draw()
              grid()

Cũng loay hoai mãi mà chẳng hiểu sao nó cứ hiện ra lỗi như này:
Traceback (most recent call last):
File “C:Program FilesPython37-32Pygame.py”, line 98, in
snake.draw()
File “C:Program FilesPython37-32Pygame.py”, line 87, in draw
pygame.draw.rect(win,(255,0,0),(self.body[body][x],self.body[body][y],block_size,block_size))
IndexError: list index out of range

Ae giải thích giúp em giờ em phải khắc phục lỗi bằng cách nào ạ?