CategoricalIndex.factorize()
pandas.CategoricalIndex.factorize
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CategoricalIndex.factorize(sort=False, na_sentinel=-1)
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Encode the object as an enumerated type or categorical variable
Parameters: sort : boolean, default False
Sort by values
na_sentinel: int, default -1
Value to mark “not found”
Returns: labels : the indexer to the original array
uniques : the unique Index
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Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.CategoricalIndex.factorize.html