pandas.CategoricalIndex.remove_unused_categories

CategoricalIndex.remove_unused_categories(*args, **kwargs)

Removes categories which are not used.

Parameters:

inplace : boolean (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