pandas.core.categorical.Categorical.add_categories

Categorical.add_categories(new_categories, inplace=False)

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 : boolean (default: False)

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

Returns :

cat : Categorical with new categories added or None if inplace.

Raises :

ValueError

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

See also

rename_categories, reorder_categories, remove_categories, remove_unused_categories, set_categories