normalize shebang lines to #!/usr/bin/env python
diff --git a/Demo/turtle/turtleDemo.py b/Demo/turtle/turtleDemo.py
index 38a44e0..3030d91 100644
--- a/Demo/turtle/turtleDemo.py
+++ b/Demo/turtle/turtleDemo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 import sys
 import os