Add mandatory headers to files touched by this branch
diff --git a/tests/primitives/test_nist.py b/tests/primitives/test_nist.py
index dc26543..db5e034 100644
--- a/tests/primitives/test_nist.py
+++ b/tests/primitives/test_nist.py
@@ -14,6 +14,9 @@
 """
 Test using the NIST Test Vectors
 """
+
+from __future__ import absolute_import, division, print_function
+
 import binascii
 import os