当我运行Python程序时，pygame窗口打开片刻，然后退出

Question

I'm a beginning programmer trying to make a game using python and pygame from an online course. But when I run the following code, the pygame window opens for a split second, then closes.

import pygame

pygame.init()
screen = pygame.display.set_mode((900,700))

finished = False

while finished == False:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            finished = True

    rectOne = pygame.Rect(0,0,30,30)

    color = (0,0,255) #R,G,B
    pygame.draw.rect(screen,color,rectOne)
    pygame.display.flip()

I don't get any error messages either. It's like it runs my loop once then changes finished to True . I've checked lots of times and my code matches the code of the online course exactly. I'm using a Mac and Python 2.7.13. Can anyone help? Update: I'm not sure if this helps, but I can still run the code below and it works perfectly fine. import pygame

pygame.init()
screen = pygame.display.set_mode((900,700))

finished = False

while finished == False:
    for event in pygame.event.get():
         if event.type == pygame.QUIT:
             finished = True

Answer 1

OK, i have searched about your problem a bit and i came to the conclusion that you need to try the following things:

A) Use pygame.display.update() instead of pygame.display.flip()

B) Try placing these at the end of your program outside the main loop: pygame.QUIT and on the next line quit()

C) If none of my above speculations work, then you need to check if the QUIT event is getting triggered automatically, do this by changing your while loop as the following:

while not finished: 
    for event in pygame.event.get():
       print(event)

After this when you run your program, in the Shell it will show the events that occur on the pygame screen, if there is a problem then the first and last event would be QUIT and then it is probably the problem of Mac or the version, because i recently read on reddit about it, check it out here