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並前往https://stackoverflow.com/questions/15535205/what-does-1-mean-do-in-python?lq=1

What does [:-1] mean/do in python? [duplicate] - Stack Overflow

It slices the string to omit the last character, in this case a newline character: >>> 'test\n'[:-1] 'test'. Since this works even on empty ...

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