forgot to add:

in your example: NEVER TRUST USER INPUT.  you'll get a much better error 
and can fix problems when you don't trust them and try to sanitize stuff

    - (x > user_provided_value)
    + (x > int(user_provided_value))  # or float or whatever

The stuff 'compile' generates won't necessarily work on your database 
though; you need to pass in a dialect.  (hence the function that just 
compiles it with a set predetermined options)

-- 
SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

To post example code, please provide an MCVE: Minimal, Complete, and Verifiable 
Example.  See  http://stackoverflow.com/help/mcve for a full description.
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