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import pygame
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pygame.init()
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# 小型外星人出现的事件
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CREATE_ENEMY = pygame.USEREVENT
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pygame.time.set_timer(CREATE_ENEMY, 500)
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# 具有发射子弹功能的外星人出现的事件
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CREATE_ENEMY_1 = pygame.NUMEVENTS
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pygame.time.set_timer(CREATE_ENEMY_1, 2000)
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