在上一篇文章中，我们确定了使用列表来存储蛇的身体结构，作为python初学者，我们选择 pygame 来实现游戏简单界面的设计。结合python的按键操作，实现简单的贪吃蛇小游戏，效果如下（gif）：

完整实现代码：

#
#file:Snakey.py
#
import sys
import pygame
import threading
import random
import time
class Snakey:
    
    def __init__(self,Row=15,Column=20):
        pygame.init()#pygame初始化
        self.score=0
        self.Tx_font = pygame.font.SysFont('arial',30)
        self.Row=Row
        self.Column=Column
        self.Side=25
        self.screen=pygame.display.set_mode((Column*self.Side,Row*self.Side))#设置显示模式
        pygame.display.set_caption("Snakey")#设置窗口标题
        self.screen.fill((128,128,128),(0,0,Column*self.Side,Row*self.Side))
        self.Tx_font = pygame.font.SysFont('arial',20)
        self.body=[[random.randint(0,Column-1),random.randint(0,Row-1)]]
        food=[random.randint(0,Column-1),random.randint(0,Row-1)]
        while self.body.count(food)!=0:
            food=[random.randint(0,Column-1),random.randint(0,Row-1)]
        pygame.draw.rect(self.screen,(0,255,0),(food[0]*self.Side,food[1]*self.Side,self.Side,self.Side))
        self.direct=0
        self.color=self.screen.get_at((self.Side//2,self.Side//2))
        """
        for i in range(self.Column+1):
            pygame.draw.line(self.screen, (0,0,0), (i*self.Side,0), (i*self.Side,Row*self.Side), 2)
        for i in range(self.Row+1):
            pygame.draw.line(self.screen, (0,0,0), (0,i*self.Side), (Column*self.Side,i*self.Side), 2)
        """
        pygame.draw.rect(self.screen,(0,0,0),(self.body[0][0]*self.Side,self.body[0][1]*self.Side,self.Side,self.Side))
        pygame.display.flip()#刷新屏幕
        pygame.event.set_blocked([pygame.MOUSEMOTION,pygame.KEYUP])
        pygame.event.set_allowed([pygame.KEYDOWN,pygame.QUIT])
        self.clock = pygame.time.Clock()
        self.run()
    def run(self):
        while True:
            #timer=threading.Timer(1,self.run)
            self.clock.tick(4)  # 每秒循环5次
            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    #timer.cancel()
                    pygame.quit()
                    sys.exit()
                elif event.type == pygame.KEYDOWN: #键被按下
                    #pygame.draw.rect(self.screen,self.color,(self.body[0][0]*self.Side,self.body[0][1]*self.Side,self.Side,self.Side))
                        
                    if event.key == pygame.K_LEFT:
                        if self.direct!=4:
                            self.direct=3
                    elif event.key == pygame.K_RIGHT:
                        if self.direct!=3:
                            self.direct=4
                    elif event.key == pygame.K_UP:
                        if self.direct!=2:
                            self.direct=1
                    elif event.key == pygame.K_DOWN:
                        if self.direct!=1:
                            self.direct=2
            self.move()
            #timer.start()
        
    def move(self):
        index=len(self.body)-1
        pos_x=self.body[index][0]
        pos_y=self.body[index][1]
        if self.direct==1:
            pos_y-=1
        elif self.direct==2:
            pos_y+=1
        elif self.direct==3:
            pos_x-=1
        elif self.direct==4:
            pos_x+=1
        if pos_x<0 or pos_x>=self.Column or pos_y<0 or pos_y>=self.Row:
            self.screen.blit(self.Tx_font.render("SCORE:"+str(self.score), True, (255,0,0)), (10, 10))
            pygame.display.flip()#刷新屏幕
            time.sleep(5)
            pygame.quit()
            sys.exit()
        elif self.screen.get_at((pos_x*self.Side+self.Side//2,pos_y*self.Side+self.Side//2))==(0,255,0):
            self.body.append([pos_x,pos_y])
            food=[random.randint(0,self.Column-1),random.randint(0,self.Row-1)]
            while self.body.count(food)!=0:
                food=[random.randint(0,self.Column-1),random.randint(0,self.Row-1)]
            pygame.draw.rect(self.screen,(0,255,0),(food[0]*self.Side,food[1]*self.Side,self.Side,self.Side))
            pygame.draw.rect(self.screen,(0,0,0),(pos_x*self.Side,pos_y*self.Side,self.Side,self.Side))
            pygame.display.flip()#刷新屏幕
            self.score+=1
        elif self.body.count([pos_x,pos_y])!=0 and self.direct!=0:
            self.screen.blit(self.Tx_font.render("SCORE:"+str(self.score), True, (255,0,0)), (10, 10))
            pygame.display.flip()#刷新屏幕
            time.sleep(5)
            pygame.quit()
            sys.exit()
        else:
            pygame.draw.rect(self.screen,self.color,(self.body[0][0]*self.Side,self.body[0][1]*self.Side,self.Side,self.Side))
            self.body.append([pos_x,pos_y])
            pygame.draw.rect(self.screen,(0,0,0),(pos_x*self.Side,pos_y*self.Side,self.Side,self.Side))
            self.body=self.body[1:len(self.body)]
            pygame.display.flip()#刷新屏幕
            
        
Snakey()