Add missing whitespace

more_itertools/more.py

@@ -1628,6 +1628,8 @@ def difference(iterable, func=sub):
     except StopIteration:
         return iter([])
     return chain([item], map(lambda x: func(x[1], x[0]), zip(a, b)))
+
+
 class seekable(object):
     """Wrap an iterator to allow for seeking backward and forward. This
     progressively caches the items in the source iterable so they can be

more_itertools/tests/test_more.py

@@ -1498,6 +1498,8 @@ def test_one(self):
 
     def test_empty(self):
         self.assertEqual(list(mi.difference([])), [])
+
+
 class SeekableTest(TestCase):
     def test_exhaustion_reset(self):
         iterable = [str(n) for n in range(10)]