--- a/contrib/hammerclient.py	Tue Jul 30 02:55:01 2019 +0200
+++ b/contrib/hammerclient.py	Tue Aug 06 16:23:57 2019 +0200
@@ -5,7 +5,7 @@
 
 if len(sys.argv) < 2:
     execname = os.path.basename(sys.argv[0])
-    print >> sys.stderr, "usage: %s CLIENT_ID" % execname
+    sys.stderr.write("usage: %s CLIENT_ID\n" % execname)
 
 client_id = sys.argv[1]