use assert[Not]In where appropriate
diff --git a/Lib/test/test_sax.py b/Lib/test/test_sax.py
index c920ad3..781cf51 100644
--- a/Lib/test/test_sax.py
+++ b/Lib/test/test_sax.py
@@ -30,7 +30,7 @@
         self.assertEquals(attrs.getNames(), [])
         self.assertEquals(attrs.getQNames(), [])
         self.assertEquals(len(attrs), 0)
-        self.assertFalse("attr" in attrs)
+        self.assertNotIn("attr", attrs)
         self.assertEquals(list(attrs.keys()), [])
         self.assertEquals(attrs.get("attrs"), None)
         self.assertEquals(attrs.get("attrs", 25), 25)
@@ -47,7 +47,7 @@
         self.assertEquals(attrs.getNames(), [])
         self.assertEquals(attrs.getQNames(), [])
         self.assertEquals(len(attrs), 0)
-        self.assertFalse((ns_uri, "attr") in attrs)
+        self.assertNotIn((ns_uri, "attr"), attrs)
         self.assertEquals(list(attrs.keys()), [])
         self.assertEquals(attrs.get((ns_uri, "attr")), None)
         self.assertEquals(attrs.get((ns_uri, "attr"), 25), 25)