fixup! BUG: Fixed pd.unique on array of tuples

Author: TomAugspurger

doc/source/whatsnew/v0.20.2.txt

@@ -44,7 +44,7 @@ Bug Fixes
 - Bug in ``DataFrame.update()`` with ``overwrite=False`` and ``NaN values`` (:issue:`15593`)
 - Passing an invalid engine to :func:`read_csv` now raises an informative
   ``ValueError`` rather than ``UnboundLocalError``. (:issue:`16511`)
-- Bug in :func:`pd.unique` on an array of tuples (:issue:`16519`)
+- Bug in :func:`unique` on an array of tuples (:issue:`16519`)
 
 
 - Fixed a compatibility issue with IPython 6.0's tab completion showing deprecation warnings on Categoricals (:issue:`16409`)

pandas/core/algorithms.py

@@ -328,6 +328,11 @@ def unique(values):
     [b, a, c]
     Categories (3, object): [a < b < c]
 
+    An array of tuples
+
+    >>> pd.unique([('a', 'b'), ('b', 'a'), ('a', 'c'), ('b', 'a')])
+    array([('a', 'b'), ('b', 'a'), ('a', 'c')], dtype=object)
+
     See Also
     --------
     pandas.Index.unique