pandas.Series.unique

Series.unique() [source]

Return np.ndarray of unique values in the object. Significantly faster than numpy.unique. Includes NA values. The order of the original is preserved.

Returns:	uniques : np.ndarray

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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.19.2/generated/pandas.Series.unique.html