Add 'if __name__ == "__main__":' to files already as a usable as a module.
diff --git a/Demo/scripts/markov.py b/Demo/scripts/markov.py
index 3329351..bddec56 100755
--- a/Demo/scripts/markov.py
+++ b/Demo/scripts/markov.py
@@ -113,4 +113,5 @@
     i = len(list)/2
     return tuple(list[:i]) + tuple(list[i:])
 
-test()
+if __name__ == "__main__":
+    test()