DOC/TST: trivial changes

doc/source/whatsnew/v0.21.0.txt

@@ -128,7 +128,8 @@ Other Enhancements
 - :func:`DataFrame.add_prefix` and :func:`DataFrame.add_suffix` now accept strings containing the '%' character. (:issue:`17151`)
 - `read_*` methods can now infer compression from non-string paths, such as ``pathlib.Path`` objects (:issue:`17206`).
 - :func:`pd.read_sas()` now recognizes much more of the most frequently used date (datetime) formats in SAS7BDAT files (:issue:`15871`).
-- :func:`DataFrame.items` is present in both Python 2 and 3 and is lazy in all cases (:issue:`13918`, :issue:`17213`)
+- :func:`DataFrame.items` is now present in both Python 2 and 3 and is lazy in all cases (:issue:`13918`, :issue:`17213`)
+
 
 
 .. _whatsnew_0210.api_breaking:

pandas/tests/frame/test_api.py

@@ -171,15 +171,15 @@ def test_nonzero(self):
     def test_iteritems(self):
         df = self.klass([[1, 2, 3], [4, 5, 6]], columns=['a', 'a', 'b'])
         for k, v in compat.iteritems(df):
-            assert type(v) == self.klass._constructor_sliced
+            assert isinstance(v, self.klass._constructor_sliced)
 
     def test_items(self):
         # issue #17213, #13918
         cols = ['a', 'b', 'c']
         df = DataFrame([[1, 2, 3], [4, 5, 6]], columns=cols)
         for c, (k, v) in zip(cols, df.items()):
             assert c == k
-            assert type(v) == Series
+            assert isinstance(v, Series)
             assert (df[k] == v).all()
 
     def test_iter(self):