Make range Python 2/3 consistent in 07-graphml.py (examples/06-graph)
@@ -2,6 +2,7 @@ from __future__ import print_function
from __future__ import unicode_literals
from builtins import str, bytes, dict, int
+from builtins import range
import os, sys; sys.path.insert(0, os.path.join("..", ".."))
