diff --git a/schulze.py b/schulze.py
index 59099a4..f567ae7 100644
--- a/schulze.py
+++ b/schulze.py
@@ -80,7 +80,7 @@ def _rank_p(candidate_names, p):
 
         candidate_wins[num_wins].append(candidate_name1)
 
-    sorted_wins = sorted(candidate_wins.iterkeys(), reverse=True)
+    sorted_wins = sorted(candidate_wins.keys(), reverse=True)
     return [candidate_wins[num_wins] for num_wins in sorted_wins]
 
 
diff --git a/schulze_test.py b/schulze_test.py
index 5fc6e69..bc105aa 100644
--- a/schulze_test.py
+++ b/schulze_test.py
@@ -17,7 +17,7 @@ def _make_ranks(self, names):
 
     def _assert_row(self, matrix, name, expected_values):
         other_names = (other_name for other_name in 'abcde' if other_name != name)
-        for other_name, expected_value in itertools.izip(other_names, expected_values):
+        for other_name, expected_value in zip(other_names, expected_values):
             actual_value = matrix.get((name, other_name), 0)
             self.assertEqual(expected_value, actual_value,
                     'matrix(%s, %s)=%s, expected %s' %