利用python做一个贪吃蛇游戏

好的，下面是一个简单的贪吃蛇游戏的Python代码：

import pygame
import random

# 初始化pygame
pygame.init()

# 游戏界面大小
width = 800
height = 600

# 颜色定义
black = pygame.Color(0, 0, 0)
white = pygame.Color(255, 255, 255)
red = pygame.Color(255, 0, 0)
green = pygame.Color(0, 255, 0)
blue = pygame.Color(0, 0, 255)

# 设置游戏界面大小及标题
screen = pygame.display.set_mode((width, height))
pygame.display.set_caption('贪吃蛇')

# 蛇的初始位置
snake_position = [100, 100]
# 蛇的初始长度
snake_body = [[100, 100], [90, 100], [80, 100]]
# 食物的初始位置
food_position = [random.randrange(1, (width // 10)) * 10, random.randrange(1, (height // 10)) * 10]
# 食物的状态（0：未被吃掉，1：已被吃掉）
food_status = 0
# 初始方向
direction = 'RIGHT'
change_direction = direction

# 游戏结束函数
def game_over():
    pygame.quit()
    exit()

# 主函数
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_over()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RIGHT:
                change_direction = 'RIGHT'
            if event.key == pygame.K_LEFT:
                change_direction = 'LEFT'
            if event.key == pygame.K_UP:
                change_direction = 'UP'
            if event.key == pygame.K_DOWN:
                change_direction = 'DOWN'
            if event.key == pygame.K_ESCAPE:
                game_over()

    # 确定蛇头的方向
    if change_direction == 'RIGHT' and not direction == 'LEFT':
        direction = 'RIGHT'
    if change_direction == 'LEFT' and not direction == 'RIGHT':
        direction = 'LEFT'
    if change_direction == 'UP' and not direction == 'DOWN':
        direction = 'UP'
    if change_direction == 'DOWN' and not direction == 'UP':
        direction = 'DOWN'

    # 根据方向移动蛇头的位置
    if direction == 'RIGHT':
        snake_position[0] += 10
    if direction == 'LEFT':
        snake_position[0] -= 10
    if direction == 'UP':
        snake_position[1] -= 10
    if direction == 'DOWN':
        snake_position[1] += 10

    # 增加蛇的长度
    snake_body.insert(0, list(snake_position))
    if snake_position == food_position:
        food_status = 1
    else:
        snake_body.pop()

    # 生成新的食物
    if food_status == 1:
        food_position = [random.randrange(1, (width // 10)) * 10, random.randrange(1, (height // 10)) * 10]
        food_status = 0

    # 绘制游戏界面
    screen.fill(black)
    for position in snake_body:
        pygame.draw.rect(screen, white, pygame.Rect(position[0], position[1], 10, 10))

    pygame.draw.rect(screen, green, pygame.Rect(food_position[0], food_position[1], 10, 10))

    # 判断游戏结束
    if snake_position[0] < 0 or snake_position[0] > width - 10:
        game_over()
    if snake_position[1] < 0 or snake_position[1] > height - 10:
        game_over()

    for block in snake_body[1:]:
        if snake_position == block:
            game_over()

    # 更新游戏界面
    pygame.display.update()

    # 控制游戏速度
    pygame.time.Clock().tick(20)

这段代码用pygame库实现了贪吃蛇游戏。你可以将这段代码保存到一个py文件中，然后在电脑上运行。