fillna(self, value=None, downcast=None)
Scalar value to use to fill holes (e.g. 0). This value cannot be a list-likes.
A dict of item->dtype of what to downcast if possible, or the string 'infer' which will try to downcast to an appropriate equal type (e.g. float64 to int64 if possible).
Fill NA/NaN values with the specified value.
DataFrame.fillna
Fill NaN values of a DataFrame.
Series.fillna
Fill NaN Values of a Series.
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