Open a blank 640x480 pixels window in PyGame, and quit when it gets closed.

pygame_blank_window.py

#!/usr/bin/env python3
import pygame
from pygame.locals import *

def main():
    srf = pygame.display.set_mode((640,480))

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

if __name__ == "__main__":
    main()