用python写一个简单的贪吃蛇游戏

好的，这里提供一个基于 Python3 和 Pygame 的简单贪吃蛇游戏代码：

import pygame
import random

# 定义一些常量
SCREEN_WIDTH = 480
SCREEN_HEIGHT = 480
BLOCK_SIZE = 20
SNAKE_INIT_POS = [(SCREEN_WIDTH // 2, SCREEN_HEIGHT // 2)]
FONT_SIZE = 24
FONT_COLOR = (255, 255, 255)

# 初始化 Pygame
pygame.init()
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption("贪吃蛇")

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

# 定义颜色
white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)
green = (0, 255, 0)

# 定义游戏对象
class Snake:
    def __init__(self):
        self.body = SNAKE_INIT_POS[:]
        self.direction = "right"
        self.grow = False

    def move(self):
        # 计算新的蛇头位置
        x, y = self.body[0]
        if self.direction == "up":
            y -= BLOCK_SIZE
        elif self.direction == "down":
            y += BLOCK_SIZE
        elif self.direction == "left":
            x -= BLOCK_SIZE
        elif self.direction == "right":
            x += BLOCK_SIZE

        # 插入新的蛇头
        self.body.insert(0, (x, y))

        # 如果不需要增长，删除最后一个方块
        if not self.grow:
            self.body.pop()
        else:
            self.grow = False

    def grow_snake(self):
        self.grow = True

    def is_collided(self, x, y):
        # 判断蛇是否碰到了自己
        for block in self.body[1:]:
            if block == (x, y):
                return True

        # 判断蛇是否碰到了边界
        if x < 0 or x >= SCREEN_WIDTH or y < 0 or y >= SCREEN_HEIGHT:
            return True

        return False

    def draw(self):
        for x, y in self.body:
            pygame.draw.rect(screen, green, (x, y, BLOCK_SIZE, BLOCK_SIZE))

class Food:
    def __init__(self):
        self.x, self.y = self.generate_new_pos()

    def generate_new_pos(self):
        x = random.randint(0, SCREEN_WIDTH // BLOCK_SIZE - 1) * BLOCK_SIZE
        y = random.randint(0, SCREEN_HEIGHT // BLOCK_SIZE - 1) * BLOCK_SIZE
        return x, y

    def draw(self):
        pygame.draw.rect(screen, red, (self.x, self.y, BLOCK_SIZE, BLOCK_SIZE))

# 初始化游戏对象
snake = Snake()
food = Food()

# 游戏循环
clock = pygame.time.Clock()
while True:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP and snake.direction != "down":
                snake.direction = "up"
            elif event.key == pygame.K_DOWN and snake.direction != "up":
                snake.direction = "down"
            elif event.key == pygame.K_LEFT and snake.direction != "right":
                snake.direction = "left"
            elif event.key == pygame.K_RIGHT and snake.direction != "left":
                snake.direction = "right"

    # 移动蛇
    snake.move()

    # 判断是否吃到食物
    if snake.body[0] == (food.x, food.y):
        snake.grow_snake()
        food.x, food.y = food.generate_new_pos()

    # 判断是否游戏结束
    if snake.is_collided(snake.body[0][0], snake.body[0][1]):
        screen.fill(black)
        text = font.render("Game Over!", True, FONT_COLOR)
        text_rect = text.get_rect(center=(SCREEN_WIDTH // 2, SCREEN_HEIGHT // 2))
        screen.blit(text, text_rect)
        pygame.display.update()
        pygame.time.wait(2000)
        pygame.quit()
        quit()

    # 绘制游戏对象
    screen.fill(black)
    snake.draw()
    food.draw()
    pygame.display.update()

    # 控制帧率
    clock.tick(10)

这个贪吃蛇游戏使用 Pygame 库来实现，可以在终端或者 Pycharm 等 Python 开发环境中运行。通过按键来控制蛇的方向，蛇碰到边界或者自己时游戏结束。