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In 2.7 ast.literal_eval blows up with a set for input:
>>> import ast
>>> ast.literal_eval("{1}")

Patch with tests

I don't profess to have any special ast knowledge, but given the context around there and the fact that it works...it looks fine to me.

Dict and Set comprehensions are also broken:
>>> {1 for x in ()}
set([])
>>> {1:2 for x in ()}
{}
>>> ast.literal_eval("{1 for x in ()}")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib64/python2.7/ast.py", line 80, in literal_eval
 return _convert(node_or_string)
 File "/usr/lib64/python2.7/ast.py", line 79, in _convert
 raise ValueError('malformed string')
ValueError: malformed string
>>> ast.literal_eval("{1:2 for x in ()}")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib64/python2.7/ast.py", line 80, in literal_eval
 return _convert(node_or_string)
 File "/usr/lib64/python2.7/ast.py", line 79, in _convert
 raise ValueError('malformed string')
ValueError: malformed string

There's no support for comprehensions of any sort, and confusingly limited support for arithmetic ops, I'd like to keep the scope of this issue small, basically backporting 90bf0631bfb8 and adding the tests (which I can also add to default).

Alex: IMO the operator support is only required for complex "literals".