def Move(label): label = "Anything" a_list = [1,2,3] Move(a_list) I don't see any error when executing above but when i manually assign [1,2,3] = "Anything" i get error Why? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/tutor/attachments/20130721/6404b3a6/attachment.html>