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並前往https://stackify.dev/154912-in-pandas-how-to-use-fillna-to-fill-the-whole-columns-with-string-if-the-column

In Pandas, How to use fillna to fill the whole columns ... - Stackify

Your 2 column probably has a float dtype: >>> df 0 1 2 3 0 a a NaN a 1 b b NaN b 2 c c NaN c >>> df.dtypes 0 object 1 object 2 float64 3 object dtype: ...

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