TypeError: 'DataFrame' objects are mutable, thus they cannot be hashed
在使用pandas的get_dummies()函数的时候，出现错误： 下面是我的dataframe: 下面是我想把data里面的rank进行one-hot编码，利用pad.get_dummies函数： 意思就是dataframe是可变的，我改了一下代码就好了，其实也不知道为什么，所以看见的同学如果知道请告诉我为什么。
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