如何知道我的矩形在pygame中与其他矩形发生了多少次碰撞？

import pygame

# 初始化pygame
pygame.init()

# 创建窗口
window_width = 800
window_height = 600
window = pygame.display.set_mode((window_width, window_height))

# 定义矩形
rect1 = pygame.Rect(100, 100, 50, 50)
rect2 = pygame.Rect(200, 200, 50, 50)
rect3 = pygame.Rect(300, 300, 50, 50)

# 碰撞计数器
collision_count = 0

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

    # 检测碰撞
    if rect1.colliderect(rect2):
        collision_count += 1
    if rect1.colliderect(rect3):
        collision_count += 1

    # 绘制矩形和计数器
    window.fill((255, 255, 255))
    pygame.draw.rect(window, (255, 0, 0), rect1)
    pygame.draw.rect(window, (0, 255, 0), rect2)
    pygame.draw.rect(window, (0, 0, 255), rect3)
    font = pygame.font.Font(None, 36)
    text = font.render("Collision Count: " + str(collision_count), True, (0, 0, 0))
    window.blit(text, (10, 10))

    pygame.display.flip()

# 退出游戏
pygame.quit()