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Alien project spacecraft collision error

2022-02-02 14:04:54 CSDN Q & A

《python Programming : From introduction to practice 》 The first 13.6.2 In response to the collision between aliens and spacecraft , Write a new class ,,


Then, according to the operation, there was an error when the spacecraft was collided by aliens , There are no new aliens after the game is suspended , It's a direct error


I've checked it several times , There's nothing wrong with the code , I don't know where the problem is , I hope you can give me some guidance to solve this problem , I've been sleepy for nearly half a month

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