import pygame
import sys


class AlienInvasion:
def _init_(self):
pygame.init()
self.screen = pygame.display.set_mode((1200,800))
pygame.display.set_caption("Alien Invasion")
def run_game():
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
pygame.display.flip()

ai = AlienInvasion
ai.run_game()
#外星人入侵