python-85行代码完成贪吃蛇和关卡升级：是男人就坚持到第10关！

import pygame
import sys
import random
SCREEN = {'x': 600, 'y': 600}  # 全局定义屏幕尺寸
class Snake(object):  # 蛇类
    def __init__(self):  # 初始化各种需要的属性 [开始时默认向右/身体块x5]
        self.dirction, self.body = pygame.K_RIGHT, []
        [self.add_node() for x in range(5)]
    def add_node(self):
        node = pygame.Rect(((self.body[0].left, self.body[0].top) if self.body else (0, 0)) + (25, 25))  # 随时增加蛇块
        if self.dirction == pygame.K_LEFT:
            node.left -= 25
        elif self.dirction == pygame.K_RIGHT:
            node.left += 25
        elif self.dirction == pygame.K_UP:
            node.top -= 25
        elif self.dirction == pygame.K_DOWN:
            node.top += 25
        self.body.insert(0, node)
    def del_node(self):
        self.body.pop()
    def is_dead(self):
        body_h = self.body[0]
        # 撞墙、撞自己则死亡
        if body_h.x not in range(SCREEN['x']) or body_h.y not in range(SCREEN['y']) or body_h in self.body[1:]:
            return True
    def move(self):
        self.add_node()
        self.del_node()
    def change_direction(self, curkey):  # 改变方向 但是左右、上下不能被逆向改变
        LR, UD = [pygame.K_LEFT, pygame.K_RIGHT], [pygame.K_UP, pygame.K_DOWN]
        if curkey in LR + UD:
            if (curkey in LR) and (self.dirction in LR) or (curkey in UD) and (self.dirction in UD):
                return
            self.dirction = curkey
class Food:  # 食物类
    def __init__(self):
        self.rect = pygame.Rect(-25, 0, 25, 25)
    def remove(self):
        self.rect.x = -25
    def set(self):
        if self.rect.x == -25:
            allpos = [pos for pos in range(75, SCREEN['x'] - 75, 25)]  # 生成的食物距离墙在75 ~ SCREEN['x']-55 之间
            self.rect.left, self.rect.top = random.choice(allpos), random.choice(allpos)
def show_text(screen, pos, text, color, font_bold=False, font_size=30, font_italic=False):
    cur_font = pygame.font.SysFont("SimHei", font_size, True)  # 设置文字样式
    cur_font.set_bold(font_bold)  # 设置是否加粗属性
    cur_font.set_italic(font_italic)  # 设置是否斜体属性
    text_fmt = cur_font.render(text, True, color)  # 设置文字内容
    screen.blit(text_fmt, pos)  # 绘制文字
def main():
    pygame.init()
    screen = pygame.display.set_mode((SCREEN['x'], SCREEN['y']))
    pygame.display.set_caption('贪吃蛇：是男人就坚持到第10关！')
    clock, scores, isdead = pygame.time.Clock(), 0, False
    snake, food = Snake(), Food()  # 蛇/食物
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            if event.type == pygame.KEYDOWN:
                snake.change_direction(event.key)
                if event.key == pygame.K_SPACE and isdead:  # 死后按space重新
                    return main()
        screen.fill((255, 255, 255))
        if not isdead:  # 画蛇身 / 每一步+1分
            snake.move()
        for rect in snake.body:
            pygame.draw.rect(screen, (144, 238, 144), rect)
        isdead = snake.is_dead()  # 显示死亡文字
        if isdead:
            show_text(screen, (150, 200), '翻车了！', (227, 29, 18), False, 80)
            show_text(screen, (50, 320), '是男人就超过60KM/h,按空格键重试...', (0, 0, 22))
        if food.rect == snake.body[0]:  # 当食物rect与蛇头重合,吃掉 -> Snake增加一个Node
            scores += 1  # 食物处理 / 吃到+1分
            food.remove()
            snake.add_node()
        food.set()  # 食物投递
        pygame.draw.rect(screen, (233, 150, 122), food.rect)
        speed = 10 + scores * 5 if scores else 10  # 蛇移动速度
        # 显示得分和速度
        show_text(screen, (20, 550), '关卡:' + str(scores) + '   速度:' + str(speed) + 'KM/h', (0, 0, 205))
        pygame.display.update()
        clock.tick(speed)
main()