尝试打印文本时,Pygame不更新显示

我正在尝试通过遵循此tutorial学习PyGame.
当我当机时,“您已当机”文本仅出现一格,并且几乎立即消失.当我在朋友PC上运行代码时,它运行得很好.

发生的视频：Streamable link

真正应该发生的事情：玩游戏->您当机->文字出现(“您死了”)->等待2秒->游戏重置

我的代码是：

import pygame
import time

pygame.init()

display_width = 800
display_height = 600
crash = False

black = (0,0)
white = (255,255,255)
red = (255,0)

gameDisplay = pygame.display.set_mode((display_width,display_height))
pygame.display.set_caption('lil spacey')
clock = pygame.time.Clock()

characterImage = pygame.transform.scale(pygame.image.load('Longcat.jpg'),(100,100))

spriteWidth = pygame.Surface.get_width(characterImage)
spriteHeight = pygame.Surface.get_height(characterImage)

def spriteCharacter(x,y):
    gameDisplay.blit(characterImage,(x,y))

def text_objects(text,font):
    textSurface = font.render(text,True,black)
    return textSurface,textSurface.get_rect()

def messageDisplay(text):
    largeText = pygame.font.Font('freesansbold.ttf',115)
    TextSurf,TextRect = text_objects(text,largeText)
    TextRect.center = ((display_width/2),(display_height/2))
    gameDisplay.blit(TextSurf,TextRect)
    pygame.display.update()
    time.sleep(2)
    gameLoop()

def crash():
    messageDisplay('You dead')

def gameLoop():
    x = (display_width * 0.45)
    y = (display_height * 0.8)

    x_change = 0
    y_change = 0

    gameExit = False

    while not gameExit:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x_change = -5
                elif event.key == pygame.K_RIGHT:
                    x_change = 5
                elif event.key == pygame.K_UP:
                    y_change = -5
                elif event.key == pygame.K_DOWN:
                    y_change = 5

            if event.type == pygame.KEYUP:
                if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                    x_change = 0
                elif event.key == pygame.K_UP or event.key == pygame.K_DOWN:
                    y_change = 0

        x += x_change
        y += y_change

        gameDisplay.fill(white)
        spriteCharacter(x,y)

        if x > display_width - spriteWidth or x < 0:
            crash()
        elif y > display_height - spriteHeight or y < 0:
            crash()

        pygame.display.update()
        clock.tick(60)

gameLoop()
pygame.quit()
quit()

我尝试过的

>重新安装Python
>重新安装Pygame

版本：

> Python：3.7.2
> Pygame：1.9.4
>作业系统：macOS Mojave

希望您能提供帮助：)