PStego.py is a module which can map between permutations and integers. Permutations, such as a shuffled deck of cards, can then be used to conceal and convey information. It's at: http://www.wiredyne.com/software/pstego.html.
Just fyi, here's another link with a java applet that rearranges a text list to hide a message:
http://www.wayner.org/books/discrypt2/sorted.php
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