CategoricalIndex.remove_unused_categories()
pandas.CategoricalIndex.remove_unused_categories
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CategoricalIndex.remove_unused_categories(*args, **kwargs)
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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/0.18.1/generated/pandas.CategoricalIndex.remove_unused_categories.html