Pygame -如何实现可能相互冲突的块？

import pygame
from pygame.locals import *

# 初始化Pygame
pygame.init()

# 创建窗口
screen = pygame.display.set_mode((800, 600))

# 创建块对象
block1 = pygame.sprite.Sprite()
block1.image = pygame.Surface((50, 50))
block1.image.fill((255, 0, 0))
block1.rect = block1.image.get_rect()
block1.rect.topleft = (100, 100)

block2 = pygame.sprite.Sprite()
block2.image = pygame.Surface((50, 50))
block2.image.fill((0, 255, 0))
block2.rect = block2.image.get_rect()
block2.rect.topleft = (200, 200)

# 创建精灵组
blocks = pygame.sprite.Group(block1, block2)

# 游戏循环
running = True
while running:
    for event in pygame.event.get():
        if event.type == QUIT:
            running = False

    # 检测块之间的碰撞
    collisions = pygame.sprite.spritecollide(block1, blocks, False)
    if block2 in collisions:
        # 块1与块2发生碰撞
        block1.image.fill((255, 255, 0))
    else:
        block1.image.fill((255, 0, 0))

    # 绘制块
    screen.fill((0, 0, 0))
    blocks.draw(screen)
    pygame.display.flip()

# 退出游戏
pygame.quit()