R. David Murray added the comment:

You haven't presented an actual use case, it would be interesting to see one.

Regardless of that, however, ast.literal_eval is an exposure of the literal 
value parsing part of the AST.  set() is not part of that, because it is not a 
literal, it is a function call.

There has been some discussion of adding a "safe_eval" function to the stdlib 
(see issue 22525), and that would be the appropriate place to introduce 
evaluation of set().

python-ideas would be the appropriate place to discuss safe_eval.

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nosy: +r.david.murray

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<http://bugs.python.org/issue24663>
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