TypeError: 'DataFrame' objects are mutable, thus they cannot be hashed
在使用pandas的get_dummies()函數的時候，出現錯誤： 下面是我的dataframe: 下面是我想把data裏面的rank進行one-hot編碼，利用pad.get_dummies函數： 意思就是dataframe是可變的，我改了一下代碼就好了，其實也不知道爲什麼，所以看見的同學如果知道請告訴我爲什麼。
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