Pygame没有移动我在屏幕上画的矩形

import pygame

# 初始化Pygame
pygame.init()

# 设置窗口大小
window_size = (800, 600)
window = pygame.display.set_mode(window_size)

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

    # 绘制矩形
    rect = pygame.Rect(100, 100, 50, 50)
    pygame.draw.rect(window, (255, 0, 0), rect)

    # 更新屏幕显示
    pygame.display.flip()

# 退出Pygame
pygame.quit()

import pygame

# 初始化Pygame
pygame.init()

# 设置窗口大小
window_size = (800, 600)
window = pygame.display.set_mode(window_size)

# 矩形初始位置
rect_x = 100
rect_y = 100

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

    # 获取键盘输入
    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT]:
        rect_x -= 1
    if keys[pygame.K_RIGHT]:
        rect_x += 1
    if keys[pygame.K_UP]:
        rect_y -= 1
    if keys[pygame.K_DOWN]:
        rect_y += 1

    # 绘制矩形
    rect = pygame.Rect(rect_x, rect_y, 50, 50)
    pygame.draw.rect(window, (255, 0, 0), rect)

    # 更新屏幕显示
    pygame.display.flip()

# 退出Pygame
pygame.quit()