如何用Python写贪吃蛇

可以使用Python中的Pygame模块来实现贪吃蛇游戏。以下是一个简单的贪吃蛇游戏的代码示例：

import pygame
import time
import random

pygame.init()

# 设置窗口大小
window_width = 800
window_height = 600

# 设置颜色
white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)

# 设置游戏区域大小
block_size = 20
game_area_width = window_width - block_size * 2
game_area_height = window_height - block_size * 2

# 初始化游戏区域
game_area = pygame.display.set_mode((window_width, window_height))
pygame.display.set_caption('贪吃蛇游戏')

# 设置字体
font = pygame.font.SysFont(None, 25)

# 定义函数，显示消息
def message_to_screen(msg, color):
    screen_text = font.render(msg, True, color)
    game_area.blit(screen_text, [window_width / 2, window_height / 2])

# 定义函数，绘制蛇
def draw_snake(snake_list, block_size):
    for xys in snake_list:
        pygame.draw.rect(game_area, black, [xys[0], xys[1], block_size, block_size])

# 定义函数，运行游戏
def game_loop():
    game_over = False
    game_close = False

    # 初始化蛇的位置和长度
    lead_x = game_area_width / 2
    lead_y = game_area_height / 2
    lead_x_change = 0
    lead_y_change = 0
    snake_list = []
    snake_length = 1

    # 初始化食物的位置
    food_x = round(random.randrange(block_size, game_area_width - block_size) / 10.0) * 10.0
    food_y = round(random.randrange(block_size, game_area_height - block_size) / 10.0) * 10.0

    while not game_over:

        while game_close == True:
            game_area.fill(white)
            message_to_screen("你输了，按Q退出或按C重新开始", red)
            pygame.display.update()

            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_over = True
                        game_close = False
                    if event.key == pygame.K_c:
                        game_loop()

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    lead_x_change = -block_size
                    lead_y_change = 0
                elif event.key == pygame.K_RIGHT:
                    lead_x_change = block_size
                    lead_y_change = 0
                elif event.key == pygame.K_UP:
                    lead_y_change = -block_size
                    lead_x_change = 0
                elif event.key == pygame.K_DOWN:
                    lead_y_change = block_size
                    lead_x_change = 0

        if lead_x >= game_area_width or lead_x < 0 or lead_y >= game_area_height or lead_y < 0:
            game_close = True

        # 移动蛇的位置
        lead_x += lead_x_change
        lead_y += lead_y_change

        game_area.fill(white)
        pygame.draw.rect(game_area, red, [food_x, food_y, block_size, block_size])

        # 绘制蛇
        snake_head = []
        snake_head.append(lead_x)
        snake_head.append(lead_y)
        snake_list.append(snake_head)
        if len(snake_list) > snake_length:
            del snake_list[0]

        for each_segment in snake_list[:-1]:
            if each_segment == snake_head:
                game_close = True

        draw_snake(snake_list, block_size)
        pygame.display.update()

        # 如果蛇吃到了食物，更新食物的位置，并增加蛇的长度
        if lead_x == food_x and lead_y == food_y:
            food_x = round(random.randrange(block_size, game_area_width - block_size) / 10.0) * 10.0
            food_y = round(random.randrange(block_size, game_area_height - block_size) / 10.0) * 10.0
            snake_length += 1

        # 控制游戏速度
        clock = pygame.time.Clock()
        clock.tick(15)

    pygame.quit()
    quit()

game_loop()

运行上述代码，即可打开一个简单的贪吃蛇游戏窗口。玩家可以使用方向键控制蛇的移动，蛇吃到食物后会增加长度，当蛇碰到边界或自己时游戏结束。