请帮我写一个贪吃蛇程序用Python语言

好的，以下是一个简单的贪吃蛇程序的Python代码，希望能帮到你：

import pygame
import random

# 初始化pygame
pygame.init()

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

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

# 设置标题
pygame.display.set_caption("贪吃蛇")

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

# 定义蛇的初始位置和大小
SNAKE_SIZE = 10
SNAKE_X = SCREEN_WIDTH / 2
SNAKE_Y = SCREEN_HEIGHT / 2
snake = [[SNAKE_X, SNAKE_Y]]
direction = "right"

# 定义食物
FOOD_SIZE = 10
food = [random.randint(0, SCREEN_WIDTH - FOOD_SIZE),
        random.randint(0, SCREEN_HEIGHT - FOOD_SIZE)]

# 定义游戏循环标志
done = False

# 定义游戏时钟
clock = pygame.time.Clock()

# 定义分数
score = 0


# 画蛇函数
def draw_snake(snake_list):
    for x, y in snake_list:
        pygame.draw.rect(screen, GREEN, [x, y, SNAKE_SIZE, SNAKE_SIZE])


# 画食物函数
def draw_food(food_list):
    pygame.draw.rect(screen, RED, [food_list[0], food_list[1], FOOD_SIZE, FOOD_SIZE])


# 显示分数函数
def show_score(score):
    score_text = font.render("Score: " + str(score), True, WHITE)
    screen.blit(score_text, [0, 0])


# 游戏循环
while not done:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                direction = "left"
            elif event.key == pygame.K_RIGHT:
                direction = "right"
            elif event.key == pygame.K_UP:
                direction = "up"
            elif event.key == pygame.K_DOWN:
                direction = "down"

    # 移动蛇
    if direction == "right":
        SNAKE_X += SNAKE_SIZE
    elif direction == "left":
        SNAKE_X -= SNAKE_SIZE
    elif direction == "up":
        SNAKE_Y -= SNAKE_SIZE
    elif direction == "down":
        SNAKE_Y += SNAKE_SIZE

    # 判断是否吃到食物
    if SNAKE_X == food[0] and SNAKE_Y == food[1]:
        food = [random.randint(0, SCREEN_WIDTH - FOOD_SIZE),
                random.randint(0, SCREEN_HEIGHT - FOOD_SIZE)]
        snake.append([SNAKE_X, SNAKE_Y])
        score += 10

    # 删除蛇尾
    if len(snake) > 1:
        del snake[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:
        done = True
    for i in range(1, len(snake)):
        if SNAKE_X == snake[i][0] and SNAKE_Y == snake[i][1]:
            done = True

    # 清屏
    screen.fill(BLACK)

    # 画蛇和食物
    draw_snake(snake)
    draw_food(food)

    # 显示分数
    show_score(score)

    # 刷新屏幕
    pygame.display.flip()

    # 控制帧率
    clock.tick(10)

# 退出pygame
pygame.quit()

这个程序使用Pygame库实现了一个简单的贪吃蛇游戏，你可以根据自己的需要对其进行修改和扩展。