Python之Pygame的Event事件模块怎么使用

import pygame

while True:
    # 等待事件发生
    event = pygame.event.wait()
    if event.type == pygame.QUIT:
        exit()
    if event.type == pygame.MOUSEBUTTONDOWN:
        print('鼠标按下', event.pos)
    if event.type == pygame.MOUSEBUTTONUP:
        print('鼠标弹起')
    if event.type == pygame.MOUSEMOTION:
        print('鼠标移动')
        # 键盘事件
    if event.type == pygame.KEYDOWN:
        # 打印按键的英文字符
        print('键盘按下', chr(event.key))
    if event.type == pygame.KEYUP:
        print('键盘弹起')

import pygame
import sys

# 初始化pygame
pygame.init()
# 定义变量
size = width, height = 600, 400
bg = (255, 255, 255)
# 加载loGo图
img = pygame.image.load("./python.png")
# 获取图像的位置
position = img.get_rect()
# 创建一个主窗口
screen = pygame.display.set_mode(size)
# 标题
pygame.display.set_caption("Python自学网")
# 创建游戏主循环
while True:
    # 设置初始值
    site = [0, 0]
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        # 图像移动 KEYDOWN 键盘按下事件
        # 通过 key 属性对应按键
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                site[1] -= 8
            if event.key == pygame.K_DOWN:
                site[1] += 8
            if event.key == pygame.K_LEFT:
                site[0] -= 8
            if event.key == pygame.K_RIGHT:
                site[0] += 8
    # 移动图像
    position = position.move(site)
    # 填充背景
    screen.fill(bg)
    # 放置图片
    screen.blit(img, position)
    # 更新显示界面
    pygame.display.flip()

import pygame
from random import randint

# 初始化程序
pygame.init()
screen = pygame.display.set_mode((450, 400))
pygame.display.set_caption("Python自学网")
# 更新显示
pygame.display.flip()
while True:
    # 等待事件发生
    event = pygame.event.wait()
    if event.type == pygame.QUIT:
        exit("成功退出")
    if event.type == pygame.MOUSEBUTTONDOWN:
        # pos 获取鼠标当前位置
        print('鼠标按下', event.pos)
        mx, my = event.pos
        # 调用 pygame.draw 模块画圆
        pygame.draw.circle(screen, (255, 255, 0), (mx, my), 50)
        # 处理完，更新显示
        pygame.display.update()
    if event.type == pygame.MOUSEBUTTONUP:
        print('鼠标弹起')
        pass
    if event.type == pygame.MOUSEMOTION:
        print('鼠标移动')
        mx, my = event.pos
        # 随机生成 RGB 颜色值
        r = randint(0, 255)
        g = randint(0, 255)
        b = randint(0, 255)
        pygame.draw.circle(screen, (r, g, b,), (mx, my), 50)
        # 处理完，更新显示
        pygame.display.update()