python写个贪吃蛇

好的，以下是一个简单的Python贪吃蛇游戏代码示例，你可以参考一下：

import pygame
import random

# 定义颜色变量
white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)
green = (0, 255, 0)
blue = (0, 0, 255)

# 定义游戏区域大小
display_width = 800
display_height = 600

pygame.init()
pygame.display.set_caption('贪吃蛇')

# 定义游戏区域
game_display = pygame.display.set_mode((display_width, display_height))

# 定义游戏时钟
clock = pygame.time.Clock()

# 定义贪吃蛇的初始位置和大小
block_size = 10
snake_speed = 15
font_style = pygame.font.SysFont(None, 50)

def message(msg, color):
    msg = font_style.render(msg, True, color)
    game_display.blit(msg, [display_width/6, display_height/3])

def snake(block_size, snake_list):
    for x,y in snake_list:
        pygame.draw.rect(game_display, green, [x, y, block_size, block_size])

# 定义游戏主函数
def game_loop():
    game_exit = False
    game_over = False

    x1 = display_width / 2
    y1 = display_height / 2

    x1_change = 0
    y1_change = 0

    snake_list = []
    length_of_snake = 1

    food_x = round(random.randrange(0, display_width - block_size) / 10.0) * 10.0
    food_y = round(random.randrange(0, display_height - block_size) / 10.0) * 10.0

    # 游戏循环
    while not game_exit:
        while game_over == True:
            game_display.fill(white)
            message("Game over, press Q to quit or C to continue", red)
            pygame.display.update()

            # 判断用户的操作
            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_exit = True
                        game_over = False
                    if event.key == pygame.K_c:
                        game_loop()

        # 判断用户的操作
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_exit = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x1_change = -block_size
                    y1_change = 0
                elif event.key == pygame.K_RIGHT:
                    x1_change = block_size
                    y1_change = 0
                elif event.key == pygame.K_UP:
                    y1_change = -block_size
                    x1_change = 0
                elif event.key == pygame.K_DOWN:
                    y1_change = block_size
                    x1_change = 0

        # 判断是否超出游戏区域
        if x1 >= display_width or x1 < 0 or y1 >= display_height or y1 < 0:
            game_over = True

        # 更新贪吃蛇的位置
        x1 += x1_change
        y1 += y1_change

        game_display.fill(white)

        # 画出食物
        pygame.draw.rect(game_display, red, [food_x, food_y, block_size, block_size])

        # 更新贪吃蛇的长度
        snake_head = []
        snake_head.append(x1)
        snake_head.append(y1)
        snake_list.append(snake_head)

        if len(snake_list) > length_of_snake:
            del snake_list[0]

        for segment in snake_list[:-1]:
            if segment == snake_head:
                game_over = True

        # 画出贪吃蛇
        snake(block_size, snake_list)

        # 更新分数
        pygame.display.update()

        # 判断贪吃蛇是否吃到了食物
        if x1 == food_x and y1 == food_y:
            food_x = round(random.randrange(0, display_width - block_size) / 10.0) * 10.0
            food_y = round(random.randrange(0, display_height - block_size) / 10.0) * 10.0
            length_of_snake += 1

        # 游戏时钟
        clock.tick(snake_speed)

    # 关闭游戏
    pygame.quit()
    quit()

game_loop()

注意：以上代码仅为示例，可能有些不足之处，欢迎大家提出修改建议。