unsupported operand type(s) for +: ‘range‘ and ‘list‘
TypeError: unsupported operand type(s) for +: 'range' and 'list'
在將range和list相加時會出現以上錯誤，只需強制將range轉換為list型別即可，如下：
columns = range(20) + ["class"]#錯誤
columns = list(range(20)) + ["class"]#正確
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