On Feb 22, 2009, at 9:43 PM, Guido van Rossum wrote:
I'm not familiar with Genshi -- what is the purpose of the AST
transformation here?

Sorry, I should have been clearer. If the only goal is to provide a restricted bare interpreter, you can certainly just exec with a restricted set of builtins and no __import__. Since Tav mentioned wanting restricted execution of Genshi templates in particular (which have a rather complicated mechanism for executing inline Python code), I threw together a realistic, self-contained 'restricting Genshi' demo which doesn't rely on outside restrictions, such as those provided by GAE.

You can ignore the AST stuff; Genshi does it for its own (non- security) purposes.

--
Ivan Krstić <[email protected]> | http://radian.org

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