pandas.CategoricalIndex.remove_unused_categories

CategoricalIndex.remove_unused_categories(*args, **kwargs)[source]

Remove categories which are not used.

Parameters

inplace:bool, default False

Whether or not to drop unused categories inplace or return a copy of this categorical with unused categories dropped.

Deprecated since version 1.2.0.

Returns

cat:Categorical or None

Categorical with unused categories dropped or None if inplace=True.

See also

rename_categories

Rename categories.

reorder_categories

Reorder categories.

add_categories

Add new categories.

remove_categories

Remove the specified categories.

set_categories

Set the categories to the specified ones.