Python贪吃蛇游戏源码分享：来自Udemy课程的实现

import pygame
import random
import sys

# 初始化
pygame.init()
WIDTH, HEIGHT = 600, 600
GRID_SIZE = 20
GRID_WIDTH = WIDTH // GRID_SIZE
GRID_HEIGHT = HEIGHT // GRID_SIZE
FPS = 10

# 颜色
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)
BLUE = (0, 120, 255)

# 方向
UP = (0, -1)
DOWN = (0, 1)
LEFT = (-1, 0)
RIGHT = (1, 0)

class Snake:
    def __init__(self):
        self.reset()
    
    def reset(self):
        self.length = 3
        self.positions = [(GRID_WIDTH // 2, GRID_HEIGHT // 2)]
        self.direction = RIGHT
        self.score = 0
        self.grow_pending = 2  # 初始长度3，还需增长2节
    
    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  # 不能直接反向
        self.direction = point
    
    def move(self):
        head = self.get_head_position()
        x, y = self.direction
        new_x = (head[0] + x) % GRID_WIDTH
        new_y = (head[1] + y) % GRID_HEIGHT
        new_position = (new_x, new_y)
        
        # 检查是否撞到自己
        if new_position in self.positions[1:]:
            self.reset()
            return False
        
        self.positions.insert(0, new_position)
        
        if self.grow_pending > 0:
            self.grow_pending -= 1
        else:
            self.positions.pop()
        
        return True
    
    def grow(self):
        self.grow_pending += 1
        self.length += 1
        self.score += 10
    
    def draw(self, surface):
        for i, p in enumerate(self.positions):
            color = GREEN if i == 0 else BLUE  # 头部绿色，身体蓝色
            rect = pygame.Rect(p[0] * GRID_SIZE, p[1] * GRID_SIZE, GRID_SIZE, GRID_SIZE)
            pygame.draw.rect(surface, color, rect)
            pygame.draw.rect(surface, BLACK, rect, 1)

class Food:
    def __init__(self):
        self.position = (0, 0)
        self.randomize_position()
    
    def randomize_position(self):
        self.position = (random.randint(0, GRID_WIDTH - 1), random.randint(0, GRID_HEIGHT - 1))
    
    def draw(self, surface):
        rect = pygame.Rect(self.position[0] * GRID_SIZE, self.position[1] * GRID_SIZE, GRID_SIZE, GRID_SIZE)
        pygame.draw.rect(surface, RED, rect)
        pygame.draw.rect(surface, BLACK, rect, 1)

def draw_grid(surface):
    for y in range(0, HEIGHT, GRID_SIZE):
        for x in range(0, WIDTH, GRID_SIZE):
            rect = pygame.Rect(x, y, GRID_SIZE, GRID_SIZE)
            pygame.draw.rect(surface, BLACK, rect, 1)

def main():
    screen = pygame.display.set_mode((WIDTH, HEIGHT))
    pygame.display.set_caption("Python贪吃蛇")
    clock = pygame.time.Clock()
    
    snake = Snake()
    food = Food()
    font = pygame.font.SysFont('arial', 25)
    
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()
            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)
        
        if not snake.move():
            continue  # 如果重置了，继续下一帧
        
        # 检查是否吃到食物
        if snake.get_head_position() == food.position:
            snake.grow()
            food.randomize_position()
            # 确保食物不出现在蛇身上
            while food.position in snake.positions:
                food.randomize_position()
        
        # 绘制
        screen.fill(WHITE)
        draw_grid(screen)
        snake.draw(screen)
        food.draw(screen)
        
        # 显示分数
        score_text = font.render(f'Score: {snake.score}', True, BLACK)
        screen.blit(score_text, (5, 5))
        
        pygame.display.update()
        clock.tick(FPS)

if __name__ == "__main__":
    main()

这个实现包含了贪吃蛇的核心逻辑：蛇的移动、转向限制、食物生成和碰撞检测。代码结构清晰，直接运行即可玩。