Garry, I asked a similar question on Stackoverflow.com and got some great responses including at least one from a member of the Python development team.
Best way to save complex Python data structures across program sessions (pickle, json, xml, database, other) http://stackoverflow.com/questions/2003693/best-way-to-save-compl ex-python-data-structures-across-program-sessions-pickle To cut-to-the-chase: I believe pickle files are portable across platforms and versions. I do not know how portable shelve files are. Malcolm
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