unique(self: '_IndexT', level: 'Hashable | None' = None) -> '_IndexT'
Unique values are returned in order of appearance, this does NOT sort.
Only return values from specified level (for MultiIndex). If int, gets the level by integer position, else by level name.
Return unique values in the index.
Series.unique
Return unique values of Series object.
unique
Numpy array of unique values in that column.
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pandas.core.indexes.base.Index.unique
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