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並前往https://stackoverflow.com/questions/2612802/list-changes-unexpectedly-after-assignment-why-is-this-and-how-can-i-prevent-it

List changes unexpectedly after assignment. - Stack Overflow

You can use the builtin list.copy() method (available since Python 3.3): · You can slice it: new_list = old_list[:] · You can use the built in list() function:

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