diff --git a/lisp/ob-python.el b/lisp/ob-python.el
index 71adf73..a1f834f 100644
--- a/lisp/ob-python.el
+++ b/lisp/ob-python.el
@@ -123,7 +123,11 @@ specifying a variable of the same value."
   "Convert RESULTS into an appropriate elisp value.
 If the results look like a list or tuple, then convert them into an
 Emacs-lisp table, otherwise return the results as a string."
-  (org-babel-script-escape results))
+  ((lambda (res)
+     (if (listp res)
+	 (mapcar (lambda (el) (if (equal el 'None) 'hline el)) res)
+       res))
+   (org-babel-script-escape results)))
 
 (defvar org-babel-python-buffers '((:default . nil)))