pandas.CategoricalIndex.remove_unused_categories

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

Remove categories which are not used.

Parameters
inplacebool, default False

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

Returns
catCategorical with unused categories dropped or None if inplace.

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.