pandas.CategoricalIndex.remove_unused_categories

CategoricalIndex.remove_unused_categories(self, *args, **kwargs)

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.

Returns:

cat : Categorical with unused categories dropped or None if inplace.

See also

rename_categories

reorder_categories

add_categories

remove_categories

set_categories