Is it possible to easily render "NOT EXISTS( " with a current API command?

Both `~exists(` and `not_(exists(` will render "NOT ( EXISTS( ".  I need to 
remove the superfluous parenthesis (this has to do with unit tests and 
ensuring parity of SQL across a handful of apps and custom commands).

I could do this with a custom function or compiler, but I feel like I must 
be missing something in the docs.

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

http://www.sqlalchemy.org/

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