pandas.CategoricalIndex.add_categories¶

CategoricalIndex.add_categories(*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 or None: Categorical with new categories added or None if inplace=True.

Raises

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