CategoricalIndex.fillna()
pandas.CategoricalIndex.fillna
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CategoricalIndex.fillna(value, downcast=None)
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Fill NA/NaN values with the specified value
Parameters: value : scalar
Scalar value to use to fill holes (e.g. 0). This value cannot be a list-likes.
downcast : dict, default is None
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)
Returns: filled : %(klas