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/pandas 0.23

pandas.CategoricalIndex.remove_unused_categories

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

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.

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Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.23.4/generated/pandas.CategoricalIndex.remove_unused_categories.html