Add 'if __name__ == "__main__":' to files already as a usable as a module.
diff --git a/Demo/scripts/unbirthday.py b/Demo/scripts/unbirthday.py
index e3b7be7..2d0b8e5 100755
--- a/Demo/scripts/unbirthday.py
+++ b/Demo/scripts/unbirthday.py
@@ -103,4 +103,5 @@
     days = days + day
     return days
 
-main()
+if __name__ == "__main__":
+    main()