I would like to check if two date ranges overlap. This is done using the 
OVERLAPS 
operator <http://www.postgresql.org/docs/9.2/static/functions-datetime.html>
.
For example:

SELECT (DATE '2001-02-16', DATE '2001-12-21') OVERLAPS
       (DATE '2001-10-30', DATE '2002-10-30');


How do I do this in SQLAlchemy? I have no clue how to produce the 
parentheses here.

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