Add 'if __name__ == "__main__":' to files already as a usable as a module.
diff --git a/Demo/scripts/pi.py b/Demo/scripts/pi.py
index d633723..9b24245 100755
--- a/Demo/scripts/pi.py
+++ b/Demo/scripts/pi.py
@@ -30,4 +30,5 @@
     # Flush so the output is seen immediately
     sys.stdout.flush()
 
-main()
+if __name__ == "__main__":
+    main()