CategoricalIndex.get_indexer_non_unique()
pandas.CategoricalIndex.get_indexer_non_unique
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CategoricalIndex.get_indexer_non_unique(target)
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this is the same for a CategoricalIndex for get_indexer; the API returns the missing values as well
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Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.CategoricalIndex.get_indexer_non_unique.html