用Python写一个贪吃蛇游戏代码

好的，以下是用Python编写贪吃蛇游戏的代码：

import pygame
import random

# 初始化游戏
pygame.init()

# 定义常量
WIDTH = 640
HEIGHT = 480
BLOCK_SIZE = 20

# 设置窗口
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("贪吃蛇")

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

# 定义贪吃蛇类
class Snake:
    def __init__(self):
        self.x = WIDTH//2
        self.y = HEIGHT//2
        self._body = [(self.x, self.y), (self.x-BLOCK_SIZE, self.y), (self.x-2*BLOCK_SIZE, self.y)]
        self._direction = 'right'

    def get_head(self):
        return self._body[0]

    def get_body(self):
        return self._body

    def move(self):
        x, y = self.get_head()
        if self._direction == 'right':
            self._body.insert(0, (x+BLOCK_SIZE, y))
        elif self._direction == 'left':
            self._body.insert(0, (x-BLOCK_SIZE, y))
        elif self._direction == 'up':
            self._body.insert(0, (x, y-BLOCK_SIZE))
        elif self._direction == 'down':
            self._body.insert(0, (x, y+BLOCK_SIZE))
        self._body.pop()

    def change_direction(self, direction):
        if direction == 'right' and self._direction != 'left':
            self._direction = 'right'
        elif direction == 'left' and self._direction != 'right':
            self._direction = 'left'
        elif direction == 'up' and self._direction != 'down':
            self._direction = 'up'
        elif direction == 'down' and self._direction != 'up':
            self._direction = 'down'

    def eat_food(self):
        x, y = self.get_head()
        if self._direction == 'right':
            self._body.insert(0, (x+BLOCK_SIZE, y))
        elif self._direction == 'left':
            self._body.insert(0, (x-BLOCK_SIZE, y))
        elif self._direction == 'up':
            self._body.insert(0, (x, y-BLOCK_SIZE))
        elif self._direction == 'down':
            self._body.insert(0, (x, y+BLOCK_SIZE))

# 定义食物类
class Food:
    def __init__(self):
        self.x = random.randint(BLOCK_SIZE, WIDTH-BLOCK_SIZE)
        self.y = random.randint(BLOCK_SIZE, HEIGHT-BLOCK_SIZE)
        self.color = GREEN

    def get_pos(self):
        return (self.x, self.y)

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

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

# 设置游戏时钟
clock = pygame.time.Clock()

# 运行游戏
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_RIGHT:
                snake.change_direction('right')
            elif event.key == pygame.K_LEFT:
                snake.change_direction('left')
            elif event.key == pygame.K_UP:
                snake.change_direction('up')
            elif event.key == pygame.K_DOWN:
                snake.change_direction('down')

    # 移动贪吃蛇
    snake.move()

    # 判断是否吃到食物
    if snake.get_head() == food.get_pos():
        snake.eat_food()
        food = Food()

    # 检测碰撞
    if snake.get_head()[0] < 0 or snake.get_head()[0] > WIDTH-BLOCK_SIZE or snake.get_head()[1] < 0 or snake.get_head()[1] > HEIGHT-BLOCK_SIZE:
        pygame.quit()
        quit()
    for block in snake.get_body()[1:]:
        if snake.get_head() == block:
            pygame.quit()
            quit()

    # 绘制屏幕
    screen.fill(BLACK)
    snake_body = snake.get_body()
    for block in snake_body:
        pygame.draw.rect(screen, WHITE, (block[0], block[1], BLOCK_SIZE, BLOCK_SIZE))
    food.draw()
    pygame.display.update()

    # 设置游戏帧率
    clock.tick(10)

以上就是用Python编写贪吃蛇游戏的代码，希望能对你有所帮助。