python贪吃蛇代码及注释

以下是Python实现贪吃蛇的代码及注释：

import pygame
import random

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

# 初始化pygame
pygame.init()

# 设置屏幕大小
screen_width = 800
screen_height = 600
screen = pygame.display.set_mode([screen_width, screen_height])

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

# 设置标题
pygame.display.set_caption('Snake Game')

# 设置时钟
clock = pygame.time.Clock()

# 设置方块大小
block_size = 10

# 定义函数，用于显示消息
def message_to_screen(msg, color):
    screen_text = font.render(msg, True, color)
    screen.blit(screen_text, [screen_width / 2, screen_height / 2])

# 定义函数，用于显示贪吃蛇
def draw_snake(block_size, snake_list):
    for x in snake_list:
        pygame.draw.rect(screen, green, [x[0], x[1], block_size, block_size])

# 定义主函数
def gameLoop():
    gameExit = False
    gameOver = False

    # 初始化贪吃蛇位置和长度
    lead_x = screen_width / 2
    lead_y = screen_height / 2
    lead_x_change = 0
    lead_y_change = 0
    snake_list = []
    snake_length = 1

    # 初始化食物位置
    randAppleX = round(random.randrange(0, screen_width - block_size) / 10.0) * 10.0
    randAppleY = round(random.randrange(0, screen_height - block_size) / 10.0) * 10.0

    # 游戏循环
    while not gameExit:

        # 游戏结束循环
        while gameOver == True:
            screen.fill(white)
            message_to_screen("Game over, press C to continue or Q to quit", red)
            pygame.display.update()

            # 监听事件
            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    gameExit = True
                    gameOver = False
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        gameExit = True
                        gameOver = False
                    if event.key == pygame.K_c:
                        gameLoop()

        # 监听事件
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                gameExit = 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

        # 判断是否撞墙
        if lead_x >= screen_width or lead_x < 0 or lead_y >= screen_height or lead_y < 0:
            gameOver = True

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

        # 画出背景
        screen.fill(white)

        # 画出食物
        pygame.draw.rect(screen, red, [randAppleX, randAppleY, block_size, block_size])

        # 将贪吃蛇头部的位置添加到贪吃蛇列表中
        snake_head = []
        snake_head.append(lead_x)
        snake_head.append(lead_y)
        snake_list.append(snake_head)

        # 判断贪吃蛇长度是否达到指定值
        if len(snake_list) > snake_length:
            del snake_list[0]

        # 判断是否吃到食物
        for eachSegment in snake_list[:-1]:
            if eachSegment == snake_head:
                gameOver = True

        # 画出贪吃蛇
        draw_snake(block_size, snake_list)

        # 更新分数
        score = snake_length - 1
        score_text = font.render("Score: " + str(score), True, black)
        screen.blit(score_text, [0, 0])

        # 更新屏幕
        pygame.display.update()

        # 判断是否吃到食物
        if lead_x == randAppleX and lead_y == randAppleY:
            randAppleX = round(random.randrange(0, screen_width - block_size) / 10.0) * 10.0
            randAppleY = round(random.randrange(0, screen_height - block_size) / 10.0) * 10.0
            snake_length += 1

        # 设置游戏帧率
        clock.tick(20)

    # 退出pygame
    pygame.quit()

    # 退出程序
    quit()

# 运行游戏
gameLoop()

以上是Python实现贪吃蛇的代码及注释，希望对你有所帮助！