Vinay Sajip <vinay_sa...@yahoo.co.uk> added the comment:

Initial evaluation indicates that ast.literal_eval doesn't cut the mustard: it 
doesn't do any name lookups, so you can't for example successfully evaluate 
something like 'handlers.WatchedFileHandler' or even 'FileHandler'. 

However, a limited evaluator which goes further than ast.literal_eval will 
probably work. One such is shown in this Gist:

https://gist.github.com/3182304

It supports a reasonable subset of Python expressions and also could be useful 
in other contexts than logging configuration.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15452>
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