【python】贪吃蛇

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

#初始化pygame库
pygame.init()
#初始化一个游戏界面
DISPLAY=pygame.display.set_mode((800,800))
#设置游戏窗口标题
pygame.display.set_caption('贪吃蛇')

#定义一个变量控制游戏速度
FPSCLOCK=pygame.time.Clock()

#定义颜色
BLACK=pygame.Color(0,0,0)
WHITE=pygame.Color(255,255,255)
RED=pygame.Color(255,0,0)

# 定义蛇头初始位置
snake_Head=[100,100]
# 定义一个蛇初始长度,因为界面都是20*20所以长度都是减20
snake_Body=[[80,100], [60,100],[40,100]]
# # 蛇初始方向
direction="right"
# 定义改变方向的变量，按键
changeDirection = direction
#定义初始食物位置
food_Postion = [300,300]
# 定义食物状态，0表示被吃，1表示没有被吃
food_Total = 1

#绘制贪吃蛇
def drawSnake(snake_Body):
    for i in snake_Body:
        pygame.draw.rect(DISPLAY,WHITE,Rect(i[0],i[1],20,20))

#绘制食物位置
def drawFood(food_Postion):
    pygame.draw.rect(DISPLAY,RED,Rect(food_Postion[0],food_Postion[1],20,20))

def gameover():
    #退出pygame
    pygame.quit()
    #退出程序
    sys.exit()


game_flag=True
while game_flag:
    #渲染底色
    DISPLAY.fill(BLACK)
    #画出贪吃蛇
    drawSnake(snake_Body)
    #画出食物位置
    drawFood(food_Postion)
    #增加游戏速度
    game_speed=1+len(snake_Body)//3
    #刷新显示层，贪吃蛇与食物每次移动，都会刷新显示层
    pygame.display.flip()
    FPSCLOCK.tick(game_speed)
    for event in pygame.event.get():
        if event.type==QUIT:
            pygame.quit()
            sys.exit()

        elif event.type == KEYDOWN:
            # 如果是右箭头或者是d，蛇向右移动
            if event.key == K_RIGHT or event.key == K_d:
                changeDirection = 'right'
            # 如果是做箭头或者是a，蛇向左移动
            if event.key == K_LEFT or event.key == K_a:
                changeDirection = 'left'
            if event.key == K_UP or event.key == K_w:
                changeDirection = 'up'
            if event.key == K_DOWN or event.key == K_s:
                changeDirection = 'down'
            # 点击esc，退出
            if event.key == KSCAN_ESCAPE:
                pygame.event.post(pygame.event.Event(QUIT))

    # 确认方向，判断是否输入了反方向
    if changeDirection == 'right' and not direction == 'left':
        direction = changeDirection
    if changeDirection == 'left' and not direction == 'right':
        direction = changeDirection
    if changeDirection == 'up' and not direction == 'down':
        direction = changeDirection
    if changeDirection == 'down' and not direction == 'up':
        direction = changeDirection

    #根据方向移动蛇头
    if direction=='right':
        snake_Head[0]+=20
    if direction=='left':
        snake_Head[0]-=20
    if direction=='up':
        snake_Head[1]-=20
    if direction=='down':
        snake_Head[1]+=20
     #增加蛇的长度
    snake_Body.insert(0,list(snake_Head))
    #判断是否吃到食物
    if snake_Head[0] == food_Postion[0] and snake_Head[1] == food_Postion[1]:
        food_Total = 0
    else:
        snake_Body.pop()

    if food_Total == 0:
        x = random.randrange(1, 32)
        y = random.randrange(1, 24)
        food_Postion = [int(x * 20), int(y * 20)]
        food_Total = 1

    if snake_Head[0] > 800 or snake_Head[0] < 0:
        gameover()
    elif snake_Head[0] > 800 or snake_Head[0] < 0:
        gameover()
        # 如果碰到自己
    for body in snake_Body[1:]:
        if snake_Head[0] == body[0] and snake_Head[1] == body[1]:
            gameover()