Python 贪吃蛇游戏：简单易懂的代码实现

以下是一个简单的 Python 贪吃蛇游戏的代码：

import pygame
import random

# 初始化
pygame.init()

# 屏幕大小
screen_width = 480
screen_height = 480

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

# 创建屏幕
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption('贪吃蛇')

# 游戏时钟
clock = pygame.time.Clock()

# 蛇的方块大小
block_size = 20

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


# 绘制文字
def draw_text(text, color, x, y):
    text_surface = font.render(text, True, color)
    screen.blit(text_surface, (x, y))


# 绘制蛇
def draw_snake(snake_list):
    for block in snake_list:
        pygame.draw.rect(screen, black, [block[0], block[1], block_size, block_size])


# 游戏循环
def game_loop():
    # 蛇的位置和长度
    snake_x = screen_width / 2
    snake_y = screen_height / 2
    snake_length = 1
    snake_list = [[snake_x, snake_y]]

    # 食物的位置
    food_x = round(random.randrange(0, screen_width - block_size) / block_size) * block_size
    food_y = round(random.randrange(0, screen_height - block_size) / block_size) * block_size

    # 蛇的移动方向
    direction = 'right'
    change_direction = direction

    # 游戏结束标志
    game_over = False

    # 游戏循环
    while not game_over:
        # 事件处理
        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:
                    change_direction = 'left'
                elif event.key == pygame.K_RIGHT:
                    change_direction = 'right'
                elif event.key == pygame.K_UP:
                    change_direction = 'up'
                elif event.key == pygame.K_DOWN:
                    change_direction = 'down'

        # 判断蛇的移动方向
        if direction == 'right' and change_direction != 'left':
            direction = change_direction
        elif direction == 'left' and change_direction != 'right':
            direction = change_direction
        elif direction == 'up' and change_direction != 'down':
            direction = change_direction
        elif direction == 'down' and change_direction != 'up':
            direction = change_direction

        # 移动蛇
        if direction == 'right':
            snake_x += block_size
        elif direction == 'left':
            snake_x -= block_size
        elif direction == 'up':
            snake_y -= block_size
        elif direction == 'down':
            snake_y += block_size

        # 判断是否吃到食物
        if snake_x == food_x and snake_y == food_y:
            food_x = round(random.randrange(0, screen_width - block_size) / block_size) * block_size
            food_y = round(random.randrange(0, screen_height - block_size) / block_size) * block_size
            snake_length += 1

        # 更新蛇的位置
        snake_head = [snake_x, snake_y]
        snake_list.append(snake_head)
        if len(snake_list) > snake_length:
            del snake_list[0]

        # 判断游戏是否结束
        if snake_x < 0 or snake_x >= screen_width or snake_y < 0 or snake_y >= screen_height:
            game_over = True
        for block in snake_list[:-1]:
            if block == snake_head:
                game_over = True

        # 绘制屏幕
        screen.fill(white)
        pygame.draw.rect(screen, red, [food_x, food_y, block_size, block_size])
        draw_snake(snake_list)
        draw_text('长度：' + str(snake_length), black, 10, 10)
        pygame.display.update()

        # 控制游戏速度
        clock.tick(10)

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


# 开始游戏
game_loop()

该游戏使用 Pygame 库实现，包含以下功能：

• 控制贪吃蛇的移动方向。
• 判断是否吃到食物，吃到食物则蛇的长度加一。
• 判断游戏是否结束，当蛇碰到边界或者碰到自己时游戏结束。
• 绘制屏幕，并在屏幕上显示贪吃蛇的长度。
• 控制游戏速度。

运行该代码，可以看到一个简单的贪吃蛇游戏。