用python写一个贪吃蛇

好的，下面是一个简单的贪吃蛇游戏，使用Python语言编写：

import pygame
import random

# 初始化 Pygame
pygame.init()

# 定义屏幕大小和方块大小
SCREEN_WIDTH = 500
SCREEN_HEIGHT = 500
BLOCK_SIZE = 10

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

# 创建屏幕对象
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption('Snake Game')

# 定义贪吃蛇类
class Snake:
    def __init__(self):
        self.length = 1
        self.positions = [(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2)]
        self.direction = random.choice([UP, DOWN, LEFT, RIGHT])
        self.color = RED

    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:]:
            self.reset()
        else:
            self.positions.insert(0, new)
            if len(self.positions) > self.length:
                self.positions.pop()

    def reset(self):
        self.length = 1
        self.positions = [(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2)]
        self.direction = random.choice([UP, DOWN, LEFT, RIGHT])

    def draw(self, surface):
        for p in self.positions:
            r = pygame.Rect((p[0], p[1]), (BLOCK_SIZE, BLOCK_SIZE))
            pygame.draw.rect(surface, self.color, r)
            pygame.draw.rect(surface, WHITE, r, 1)

    def handle_keys(self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_UP:
                    self.turn(UP)
                elif event.key == pygame.K_DOWN:
                    self.turn(DOWN)
                elif event.key == pygame.K_LEFT:
                    self.turn(LEFT)
                elif event.key == pygame.K_RIGHT:
                    self.turn(RIGHT)

# 定义食物类
class Food:
    def __init__(self):
        x = random.randrange(BLOCK_SIZE, SCREEN_WIDTH - BLOCK_SIZE, BLOCK_SIZE)
        y = random.randrange(BLOCK_SIZE, SCREEN_HEIGHT - BLOCK_SIZE, BLOCK_SIZE)
        self.position = (x, y)
        self.color = WHITE

    def draw(self, surface):
        r = pygame.Rect((self.position[0], self.position[1]), (BLOCK_SIZE, BLOCK_SIZE))
        pygame.draw.rect(surface, self.color, r)
        pygame.draw.rect(surface, BLACK, r, 1)

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

# 创建贪吃蛇和食物对象
snake = Snake()
food = Food()

# 游戏主循环
while True:
    screen.fill(BLACK)

    snake.handle_keys()
    snake.move()

    if snake.get_head_position() == food.position:
        snake.length += 1
        food = Food()

    snake.draw(screen)
    food.draw(screen)

    pygame.display.update()

    # 判断是否结束游戏
    if snake.get_head_position()[0] < 0 or snake.get_head_position()[0] > SCREEN_WIDTH - BLOCK_SIZE:
        snake.reset()
    elif snake.get_head_position()[1] < 0 or snake.get_head_position()[1] > SCREEN_HEIGHT - BLOCK_SIZE:
        snake.reset()

    # 控制游戏速度
    pygame.time.delay(50)

这个贪吃蛇游戏使用 Pygame 模块实现，运行代码后可以在窗口中玩游戏。玩法和经典贪吃蛇游戏相同，通过方向键控制贪吃蛇的移动，吃到食物后贪吃蛇长度加一，撞到墙壁或自己的身体则游戏结束。