写一个python贪吃蛇

好的，以下是一个简单的Python贪吃蛇游戏。

import pygame
import random

# 定义一些常量
WIDTH = 800
HEIGHT = 600
FPS = 10
BLOCK_SIZE = 20

# 定义一些颜色
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)

# 初始化 Pygame
pygame.init()
pygame.mixer.init()
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("贪吃蛇")
clock = pygame.time.Clock()

# 定义一些函数
def draw_block(color, x, y):
    pygame.draw.rect(screen, color, [x, y, BLOCK_SIZE, BLOCK_SIZE])

def game_over():
    font = pygame.font.SysFont(None, 48)
    text = font.render("游戏结束", True, WHITE)
    screen.blit(text, (WIDTH / 2 - text.get_width() / 2, HEIGHT / 2 - text.get_height() / 2))
    pygame.display.flip()
    pygame.time.wait(2000)
    pygame.quit()
    quit()

# 定义 Snake 类
class Snake:
    def __init__(self):
        self.length = 1
        self.positions = [(WIDTH / 2, HEIGHT / 2)]
        self.direction = random.choice([UP, DOWN, LEFT, RIGHT])
        self.color = GREEN

    def get_head_position(self):
        return self.positions[0]

    def turn(self, point):
        if self.length > 1 and (point[0] * -1, point[1] * -1) == self.direction:
            return
        else:
            self.direction = point

    def move(self):
        cur = self.get_head_position()
        x, y = self.direction
        new = ((cur[0] + (x * BLOCK_SIZE)), (cur[1] + (y * BLOCK_SIZE)))
        if new in self.positions[2:]:
            game_over()
        else:
            self.positions.insert(0, new)
            if len(self.positions) > self.length:
                self.positions.pop()

    def draw(self):
        for p in self.positions:
            draw_block(self.color, p[0], p[1])

# 定义 Food 类
class Food:
    def __init__(self):
        x = random.randrange(0, WIDTH, BLOCK_SIZE)
        y = random.randrange(0, HEIGHT, BLOCK_SIZE)
        self.position = (x, y)
        self.color = RED

    def draw(self):
        draw_block(self.color, self.position[0], self.position[1])

# 定义一些方向常量
UP = (0, -1)
DOWN = (0, 1)
LEFT = (-1, 0)
RIGHT = (1, 0)

# 创建 Snake 和 Food 对象
snake = Snake()
food = Food()

# 游戏主循环
running = True
while running:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                snake.turn(UP)
            elif event.key == pygame.K_DOWN:
                snake.turn(DOWN)
            elif event.key == pygame.K_LEFT:
                snake.turn(LEFT)
            elif event.key == pygame.K_RIGHT:
                snake.turn(RIGHT)

    # 移动 Snake
    snake.move()

    # 检查是否碰到了 Food
    if snake.get_head_position() == food.position:
        snake.length += 1
        food = Food()

    # 绘制背景
    screen.fill(BLACK)

    # 绘制 Snake 和 Food
    snake.draw()
    food.draw()

    # 刷新屏幕
    pygame.display.flip()

    # 控制游戏帧率
    clock.tick(FPS)

# 退出 Pygame
pygame.quit()

希望这个简单的贪吃蛇游戏可以帮到你。