pandas.CategoricalIndex.add_categories

CategoricalIndex.add_categories(self, *args, **kwargs)[source]

Add new categories.

new_categories will be included at the last/highest place in the categories and will be unused directly after this call.

Parameters
new_categoriescategory or list-like of category

The new categories to be included.

inplacebool, default False

Whether or not to add the categories inplace or return a copy of this categorical with added categories.

Returns
catCategorical with new categories added or None if inplace.
Raises
****ValueError

If the new categories include old categories or do not validate as categories

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