给出贪食蛇游戏的python代码

好的，以下是一个简单的贪食蛇游戏的Python代码，供参考：

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
size = (800, 600)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Snake Game")

# 定义贪食蛇类
class Snake:
    def __init__(self):
        self.length = 1
        self.positions = [(random.randint(0, 39) * 10, random.randint(0, 29) * 10)]
        self.direction = random.choice([pygame.K_UP, pygame.K_DOWN, pygame.K_LEFT, pygame.K_RIGHT])
        self.color = GREEN

    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 * 10)), (cur[1] + (y * 10)))
        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 = [(random.randint(0, 39) * 10, random.randint(0, 29) * 10)]
        self.direction = random.choice([pygame.K_UP, pygame.K_DOWN, pygame.K_LEFT, pygame.K_RIGHT])

    def draw(self, surface):
        for p in self.positions:
            r = pygame.Rect((p[0], p[1]), (10, 10))
            pygame.draw.rect(surface, self.color, r)
            pygame.draw.rect(surface, BLACK, 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_ESCAPE:
                    pygame.quit()
                elif event.key == pygame.K_UP:
                    self.turn((0, -1))
                elif event.key == pygame.K_DOWN:
                    self.turn((0, 1))
                elif event.key == pygame.K_LEFT:
                    self.turn((-1, 0))
                elif event.key == pygame.K_RIGHT:
                    self.turn((1, 0))

# 定义食物类
class Food:
    def __init__(self):
        self.position = (0, 0)
        self.color = RED
        self.randomize_position()

    def randomize_position(self):
        self.position = (random.randint(0, 39) * 10, random.randint(0, 29) * 10)

    def draw(self, surface):
        r = pygame.Rect((self.position[0], self.position[1]), (10, 10))
        pygame.draw.rect(surface, self.color, r)
        pygame.draw.rect(surface, BLACK, r, 1)

# 创建游戏对象
snake = Snake()
food = Food()

# 设置游戏时钟
clock = pygame.time.Clock()

# 游戏循环
while True:
    screen.fill(WHITE)
    snake.handle_keys()
    snake.move()
    if snake.get_head_position() == food.position:
        snake.length += 1
        food.randomize_position()
    snake.draw(screen)
    food.draw(screen)
    pygame.display.update()
    clock.tick(20)

这个游戏实现了贪食蛇的基本功能，包括蛇的移动、吃食物、重新开始等。你可以根据需要对代码进行修改和优化。