如何让我的玩家与平台pygame发生碰撞？

import pygame
from pygame.locals import *

# 初始化pygame
pygame.init()

# 创建游戏窗口
screen = pygame.display.set_mode((800, 600))

# 定义玩家和平台的矩形边界
player_rect = pygame.Rect(100, 300, 50, 50)
platform_rect = pygame.Rect(300, 400, 200, 20)

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

    # 检测碰撞
    if player_rect.colliderect(platform_rect):
        # 处理碰撞事件
        print("玩家与平台发生碰撞！")

    # 绘制游戏界面
    screen.fill((255, 255, 255))
    pygame.draw.rect(screen, (0, 0, 0), player_rect)
    pygame.draw.rect(screen, (255, 0, 0), platform_rect)
    pygame.display.flip()

# 退出游戏
pygame.quit()