Python Pygame中为什么有张图片会闪烁

当我试图运行这个程序时，其中一个图像没有闪烁(没有条件)，但另一个图像(我使其只在单击鼠标左键时显示)闪烁，我真的不知道如何修复它，所以我的程序如下:

import pygame, sys
from pygame.locals import *

pygame.init()

screen_size = (900, 600)#game size

screen = pygame.display.set_mode(screen_size,0, 32)

clock = pygame.time.Clock()

bullet = pygame.image.load('bullet_right.png')

display = pygame.Surface((300,200))

displaybullet = False

while True:
    display.fill((255,255,255))

    display.blit(bullet, (0,100))#no flicker :)
    
    mouse_x, mouse_y = pygame.mouse.get_pos()

    mouse_info = pygame.mouse.get_pressed()#0.lmb, 1.scroll thing 2.rmb

    print(mouse_info[0])
    
    for event in pygame.event.get():
        if event.type == QUIT:#stops the program when press exit
            pygame.quit()
            sys.exit()

        if mouse_info[0] == True:
            displaybullet = True
            #display.blit(bullet, (100,100))
        if displaybullet:
            display.blit(bullet, (100,100))#flicker:(
            
    surf = pygame.transform.scale(display, screen_size)
    screen.blit(surf, (0,0))
    
    pygame.display.update()

    clock.tick(60)

我先是试着取下Clock.tick(60)，但似乎不起作用.