绘制一条游行的蛇pyhton

以下是使用 Python 的 Pygame 库绘制游行蛇的示例代码：

import pygame
import random

# 定义常量
SCREEN_WIDTH = 600
SCREEN_HEIGHT = 600
SNAKE_SIZE = 20
FOOD_SIZE = 10
SNAKE_COLOR = (0, 255, 0)
FOOD_COLOR = (255, 0, 0)
BACKGROUND_COLOR = (0, 0, 0)

# 初始化 Pygame
pygame.init()

# 创建游戏窗口
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption('Snake Game')

# 定义 Snake 类
class Snake:
    def __init__(self):
        self.x = SCREEN_WIDTH // 2
        self.y = SCREEN_HEIGHT // 2
        self.direction = random.choice(['up', 'down', 'left', 'right'])
        self.body = [(self.x, self.y)]
    
    def move(self):
        if self.direction == 'up':
            self.y -= SNAKE_SIZE
        elif self.direction == 'down':
            self.y += SNAKE_SIZE
        elif self.direction == 'left':
            self.x -= SNAKE_SIZE
        elif self.direction == 'right':
            self.x += SNAKE_SIZE
        self.body.insert(0, (self.x, self.y))
        self.body.pop()
        
    def draw(self):
        for x, y in self.body:
            pygame.draw.rect(screen, SNAKE_COLOR, (x, y, SNAKE_SIZE, SNAKE_SIZE))

# 定义 Food 类
class Food:
    def __init__(self):
        self.x = random.randint(0, SCREEN_WIDTH - FOOD_SIZE)
        self.y = random.randint(0, SCREEN_HEIGHT - FOOD_SIZE)
    
    def draw(self):
        pygame.draw.rect(screen, FOOD_COLOR, (self.x, self.y, FOOD_SIZE, FOOD_SIZE))

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

# 游戏循环
while True:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                snake.direction = 'up'
            elif event.key == pygame.K_DOWN:
                snake.direction = 'down'
            elif event.key == pygame.K_LEFT:
                snake.direction = 'left'
            elif event.key == pygame.K_RIGHT:
                snake.direction = 'right'
    
    # 移动 Snake
    snake.move()
    
    # 判断是否吃到了 Food
    if snake.body[0][0] == food.x and snake.body[0][1] == food.y:
        snake.body.append((snake.body[-1][0], snake.body[-1][1]))
        food = Food()
    
    # 绘制游戏界面
    screen.fill(BACKGROUND_COLOR)
    snake.draw()
    food.draw()
    pygame.display.update()

运行以上代码，即可在 Pygame 窗口中看到游行蛇的效果。玩家可以通过方向键控制蛇的移动方向，目标是吃到食物并尽可能长时间地存活下去。