如何在SenseHat上制作的蛇游戏中让蛇死？

Question

我正在SenseHAT上创建蛇游戏，并且试图使蛇在触碰到自己时死亡。

我变了一个死变量并使它变假，以便当它为假时它使我的蛇停止运动。但这是行不通的。

以下是我的整个代码，因为我不太确定是什么导致了问题

import random
from random import randint
import time
from sense_hat import SenseHat
sense = SenseHat()

dead = False
vegetables = []
direction = "right"
colx = randint(0,255)
coly = randint(0,255)
colz = randint(0,255)
food_col = (colx, coly, colz)
blank = (0, 0, 0)
white = (255, 255, 255)
green = (0, 255, 0)
snake =[ [2,4], [3,4], [4,4] ]
score = (0)
pause = (0.5)

def draw_snake():
  for segment in snake: 
    sense.set_pixel(segment[0], segment[1], green)

def move():
  global score, pause
  last = snake[-1]
  first = snake[0]
  next = list(last)     
  remove = True

  if direction == "right":
    if last[0] + 1 == 8:
     next[0] = 0
    else:
     next[0] = last[0] + 1

  elif direction == "left":
    if last[0] - 1 == -1: 
      next[0] = 7
    else:
      next[0] = last[0] - 1

  elif direction == "down":
    if last[1] + 1 == 8: 
      next[1] = 0
    else:
      next[1] = last[1] + 1

  elif direction == "up":
    if last[1] - 1 == -1: 
      next[1] = 7
    else: 
      next[1] = last[1] - 1

  dead = True

  snake.append(next)

  sense.set_pixel(next[0], next[1], green)

  if next in vegetables:
    vegetables.remove(next)
    score += 1
    if score % 1 == 0:
      remove = False
    if score % 1 == 0:
      pause = pause * 0.9

  if remove == True:
    sense.set_pixel(first[0], first[1], blank)
    snake.remove(first)

def joystick_moved(event):
  global direction
  direction = event.direction

def make_food():
  new = snake[0]
  while new in snake:
    x = randint(0,7)
    y = randint(0,7)
    new = [x,y]
    for segment in new: 
      sense.set_pixel(x, y, food_col)
  vegetables.append(new)

sense.clear()
draw_snake()
sense.stick.direction_any = joystick_moved
while not dead: 
  if len(vegetables) < 1: 
    make_food()
  move()
  time.sleep(pause)

我一直在寻找同一个蛇游戏的其他人的脚本以寻求帮助，但我真的看不出有什么区别（https://trinket.io/python/b9e8a05f5b）

谢谢