Address review comments

Author: fjetter

doc/source/whatsnew/v0.23.0.txt

@@ -1289,8 +1289,8 @@ Indexing
 - Bug in performing in-place operations on a ``DataFrame`` with a duplicate ``Index`` (:issue:`17105`)
 - Bug in :meth:`IntervalIndex.get_loc` and :meth:`IntervalIndex.get_indexer` when used with an :class:`IntervalIndex` containing a single interval (:issue:`17284`, :issue:`20921`)
 - Bug in ``.loc`` with a ``uint64`` indexer (:issue:`20722`)
-- Bug in ``CategoricalIndex.searchsorted`` where the method didn't return a scalar when the input values was scalar (:issue:`21019`)
-- Bug in ``CategoricalIndex`` where slicing beyond the range of the data raised a KeyError (:issue:`21019`)
+- Bug in :func:`CategoricalIndex.searchsorted` where the method did not return a scalar when the input values was scalar (:issue:`21019`)
+- Bug in :class:`CategoricalIndex` where slicing beyond the range of the data raised a KeyError (:issue:`21019`)
 
 
 MultiIndex

pandas/core/indexes/category.py

@@ -436,10 +436,10 @@ def get_loc(self, key, method=None):
         >>> non_monotonic_index.get_loc('b')
         array([False,  True, False,  True], dtype=bool)
         """
-        try:
-            codes = self.categories.get_loc(key)
-        except KeyError:
-            raise KeyError("Category `{}` unknown".format(key))
+        codes = self.categories.get_loc(key)
+        if (codes == -1):
+            raise KeyError(key)
+
         return self._engine.get_loc(codes)
 
     def get_value(self, series, key):

pandas/tests/categorical/test_analytics.py

@@ -86,7 +86,7 @@ def test_searchsorted(self):
         # Searching for single item argument, side='left' (default)
         res_cat = c1.searchsorted('apple')
         res_ser = s1.searchsorted('apple')
-        exp = np.int64(2)
+        exp = np.intp(2)
         assert res_cat == exp
         assert res_ser == exp