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_categories:category or list-like of category: The new categories to be included.
inplace:bool, default False: Whether or not to add the categories inplace or return a copy of this categorical with added categories.

Deprecated since version 1.3.0.

Returns

cat:Categorical 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