Index: pyjwkest-9ed11b406911dde70b281b2473a976ec88afd1a9/tests/test_4_jwe.py
===================================================================
--- pyjwkest-9ed11b406911dde70b281b2473a976ec88afd1a9.orig/tests/test_4_jwe.py
+++ pyjwkest-9ed11b406911dde70b281b2473a976ec88afd1a9/tests/test_4_jwe.py
@@ -25,7 +25,10 @@ __author__ = 'rohe0002'
 
 
 def intarr2bytes(arr):
-    return array.array('B', arr).tostring()
+    if sys.version_info[0] >= 3:
+        return array.array('B', arr).tobytes()
+    else:
+        return array.array('B', arr).tostring()
 
 
 def bytes2intarr(bts):