用Python如何写一个贪吃蛇游戏

Python写贪吃蛇游戏可以使用Pygame库来实现。以下是一个简单的贪吃蛇游戏的示例代码：

import pygame
import random

pygame.init()

# 游戏窗口大小
window_width = 800
window_height = 600

# 贪吃蛇方块大小和速度
block_size = 20
snake_speed = 10

# 颜色定义
white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)

# 创建游戏窗口
game_display = pygame.display.set_mode((window_width, window_height))
pygame.display.set_caption('Snake Game')

# 定义字体
font = pygame.font.SysFont(None, 25)


# 显示消息函数
def message_to_screen(msg, color):
    screen_text = font.render(msg, True, color)
    game_display.blit(screen_text, [window_width / 6, window_height / 3])


# 游戏主循环函数
def game_loop():
    game_exit = False
    game_over = False

    # 贪吃蛇初始位置和长度
    lead_x = window_width / 2
    lead_y = window_height / 2
    lead_x_change = 0
    lead_y_change = 0
    snake_list = []
    snake_length = 1

    # 食物初始位置
    food_x = round(random.randrange(0, window_width - block_size) / 10.0) * 10.0
    food_y = round(random.randrange(0, window_height - block_size) / 10.0) * 10.0

    # 游戏主循环
    while not game_exit:
        # 如果游戏结束，显示游戏结束消息
        while game_over:
            game_display.fill(white)
            message_to_screen("Game Over, press C to play again or Q to quit", red)
            pygame.display.update()

            # 处理按键事件
            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    game_exit = True
                    game_over = False
                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()

        # 处理按键事件
        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:
                    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

        # 移动贪吃蛇
        lead_x += lead_x_change
        lead_y += lead_y_change

        # 判断贪吃蛇是否碰到边界
        if lead_x >= window_width or lead_x < 0 or lead_y >= window_height or lead_y < 0:
            game_over = True

        # 绘制食物和贪吃蛇
        game_display.fill(white)
        pygame.draw.rect(game_display, red, [food_x, food_y, block_size, block_size])
        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 segment in snake_list[:-1]:
            if segment == snake_head:
                game_over = True

        for segment in snake_list:
            pygame.draw.rect(game_display, black, [segment[0], segment[1], block_size, block_size])

        pygame.display.update()

        # 如果贪吃蛇吃到食物，分数加1，贪吃蛇长度加1，重新生成食物
        if lead_x == food_x and lead_y == food_y:
            food_x = round(random.randrange(0, window_width - block_size) / 10.0) * 10.0
            food_y = round(random.randrange(0, window_height - block_size) / 10.0) * 10.0
            snake_length += 1

        # 控制游戏帧率
        clock = pygame.time.Clock()
        clock.tick(snake_speed)

    # 退出游戏
    pygame.quit()
    quit()


game_loop()

上述代码使用了Pygame库实现了一个简单的贪吃蛇游戏。该游戏使用方向键来控制贪吃蛇的移动，当贪吃蛇吃到食物时，分数加1，贪吃蛇长度加1，重新生成食物。当贪吃蛇碰到边界或自己时，游戏结束。