use assert[Not]In where appropriate
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 1c3d4fe..cadac99 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -540,10 +540,10 @@
self.assertEqual(c, dict(a=4, b=0, d=-2, e=-5, f=4))
self.assertEqual(''.join(sorted(c.elements())), 'aaaaffff')
self.assertEqual(c.pop('f'), 4)
- self.assertEqual('f' in c, False)
+ self.assertNotIn('f', c)
for i in range(3):
elem, cnt = c.popitem()
- self.assertEqual(elem in c, False)
+ self.assertNotIn(elem, c)
c.clear()
self.assertEqual(c, {})
self.assertEqual(repr(c), 'Counter()')