游戏源代码中只用到pygame的小游戏源代码

好的，以下是一个简单的使用pygame编写的“贪吃蛇”小游戏的源代码：

import pygame
import random

# 初始化pygame
pygame.init()

# 设置游戏窗口大小
WINDOW_WIDTH = 500
WINDOW_HEIGHT = 500

# 设置贪吃蛇和食物的大小
BLOCK_SIZE = 10

# 创建游戏窗口
window = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT))
pygame.display.set_caption('贪吃蛇')

# 定义颜色
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)

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

# 定义一个函数，用于在屏幕上显示文字
def message_to_screen(msg, color):
    screen_text = font.render(msg, True, color)
    window.blit(screen_text, [WINDOW_WIDTH/6, WINDOW_HEIGHT/2])

# 定义一个函数，用于绘制贪吃蛇
def draw_snake(snake_block_size, snake_list):
    for x in snake_list:
        pygame.draw.rect(window, BLACK, [x[0], x[1], snake_block_size, snake_block_size])

# 定义游戏循环
def game_loop():
    game_over = False
    game_close = False

    # 初始位置
    x1 = WINDOW_WIDTH / 2
    y1 = WINDOW_HEIGHT / 2

    # 初始速度
    x1_change = 0
    y1_change = 0

    # 初始长度
    snake_List = []
    Length_of_snake = 1

    # 随机生成食物位置
    foodx = round(random.randrange(0, WINDOW_WIDTH - BLOCK_SIZE) / 10.0) * 10.0
    foody = round(random.randrange(0, WINDOW_HEIGHT - BLOCK_SIZE) / 10.0) * 10.0

    while not game_over:

        while game_close == True:
            window.fill(WHITE)
            message_to_screen("游戏结束，按Q退出，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:
                    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

        # 判断贪吃蛇是否撞到边界
        if x1 >= WINDOW_WIDTH or x1 < 0 or y1 >= WINDOW_HEIGHT or y1 < 0:
            game_close = True

        # 更新蛇头坐标
        x1 += x1_change
        y1 += y1_change

        # 绘制游戏界面
        window.fill(WHITE)
        pygame.draw.rect(window, RED, [foodx, foody, BLOCK_SIZE, BLOCK_SIZE])
        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 x in snake_List[:-1]:
            if x == snake_Head:
                game_close = True

        draw_snake(BLOCK_SIZE, snake_List)
        pygame.display.update()

        # 判断贪吃蛇是否吃到食物
        if x1 == foodx and y1 == foody:
            foodx = round(random.randrange(0, WINDOW_WIDTH - BLOCK_SIZE) / 10.0) * 10.0
            foody = round(random.randrange(0, WINDOW_HEIGHT - BLOCK_SIZE) / 10.0) * 10.0
            Length_of_snake += 1

        # 刷新游戏界面
        pygame.display.update()

    # 退出pygame
    pygame.quit()

# 开始游戏循环
game_loop()

这是一个比较简单的贪吃蛇游戏，其中使用了pygame库来实现游戏界面的绘制和事件的处理。希望能对你有所帮助！