飞机大战由《python编程从入门到实践》项目外星人入侵改编

Name		Name	Last commit message	Last commit date
Latest commit History 3 Commits
images		images
README.md		README.md
alien.py		alien.py
alien_invasion.py		alien_invasion.py
bullet.py		bullet.py
button.py		button.py
game_functions.py		game_functions.py
game_stats.py		game_stats.py
scoreboard.py		scoreboard.py
settings.py		settings.py
ship.py		ship.py

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